OPERATION AND INSTALLATION MANUAL
For Models:
ERV700DD Pool ERV1200DD Pool
NOTE: ALTHOUGH SOME MODELS DIFFER IN OPERATION, THE BASIC STEPS ARE SIMILAR.
CAUTION Before installation, careful consideration must be given to how the system will operate if connected to any other piece of mechanical equipment, i.e. a forced air furnace or air handler, operating at a higher static. After installation, the compatibility of the two pieces of equipment must be confirmed, by measuring the airflow's of the Energy Recovery Ventilator (ERV), by using the balancing procedure in this manual. It is always important to assess how the operation of any ERV may interact with vented combustion equipment (ie. Gas Furnaces, Oil Furnaces, Wood Stoves, etc.). NEVER install an ERV in a situation where its normal operation, lack of operation or partial failure may result in the backdrafting or improper functioning of vented combustion equipment!!! TO BE COMPLETED BY CONTRACTOR AFTER INSTALLATION
Installing Contractor Telephone / Contact Serial Number Installation Date Model * LEAVE FOR HOMEOWNER
NOTE: Due to ongoing research and product development, specifications, ratings and dimensions are subject to change without notice. SN-81
0112 Table of Contents
Introduction .................................................................... 2 Technical Data - Model ERV700DD POOL ................... 3 Technical Data - Model ERV1200DD POOL ................. 4 Sizing Your Pool ERV ................................................... 5 Calculation .................................................................... 6 System Installations ................................................... 6 Table 1 Evaporation Rate ............................................. 7 Table 2 Flowrate Factor ............................................... 8 Installation Diagram Sketch #1 .................................. 9 Installation Diagram Sketch #2 .................................. 10 Location for Mounting ................................................. 11 The Ductwork System .............................................. 11 Outside Weatherhoods ............................................... 12 Ducting from Weatherhoods ........................................12 Warmside Ducting - General ........................................ 12 Stale Air Return System ............................................ 12 Fresh Air Supply System ............................................ 13 Various Installation Types ........................................... 14 Electrical Connections ..............................................15 Damper Defrost .......................................................... 15 Auto Self Test of Defrost Systems .............................. 15 Operation of the ERV ................................................ 16 Ducting Requirements & Mode of Operation .............. 17 Speed Selection and Controls .................................... 18 Pitot Tube Air Flow Balancing ................................. 19 Service/Maintenance ................................................ 20 Motor ........................................................................... 20 ERV Core .................................................................... 20 Filters .......................................................................... 21 Duct Work ................................................................... 21 Damper Motor ............................................................. 21 General Maintenance ................................................. 21 Troubleshooting Your ERV System ........................ 22 Wiring Diagram ......................................................... 23 Warranty .................................................................... 24 INTRODUCTION
A Energy Recovery Ventilator (ERV) is designed to provide fresh air into a building while exhausting an equal amount of stale air. During the winter months, the incoming cold fresh air is warmed by utilizing the energy recovered from the stale air before it is exhausted to the outdoors. During summer months when the indoor space is air conditioned, the Energy Recovery Ventilator will help in cooling the incoming fresh air with the stale air that is being exhausted. ACME MANUFACTURING COMPANY 7500 State Road Philadelphia, PA 19136-3495 (800) 899-2850 ACME MANUFACTURING COMPANY 4500 Entec Drive Bartonville, IL 61607 (800) 447-1674 ACME MANUFACTURING COMPANY 214 Commercial Street Medina, NY 14103-1293 (800) 229-0021 ALCO MANUFACTURING COMPANY U.S. 29 SOUTH Salisbury, NC 28145-0078 (800) 477-0321 ALCO MANUFACTURING COMPANY 3365 Florence Road Powder Springs, GA 30127-3830 (800) 888-4391 ALCO MANUFACTURING COMPANY 81 Braswell Road Hattiesburg, MS 39401-9730 (800) 477-2526 SNAPPY 1011 11th Ave. SE Detroit Lakes, MN 56501 (800) 328-2044 SNAPPY 10923 Leroy Drive Northglenn, CO 80233 (800) 552-4582 SNAPPY 13529 S.E. Johnson Road Milwaukie, OR 97222 (800) 300-1660 Model ERV700DD POOL
SPECIFICATIONS
CORES Modular (2 section) patented aluminum energy recovery cores arranged for efficient cross-flow ventilation.Meets the flame spread and smoke developed classifications of the National Building Code and NFPA 90A (1993 Edition) MOTORS Two PSC, 3 speed single shafted, 120 VAC, 2.75 Amps each (5.5 total on high speed). HP - 1/10, 1625 RPM. Watts - total on high speed - 648. FILTERS Washable air filters in exhaust and supply air streams. BLOWERS Centrifugal type rated at 700 cfm (329 L/s) free air delivery. Each air stream has one single shafted motor driving a centrifugal blower. CONNECTION DUCT SIZES Five - 14" x 8" H (356 mm x 200 mm H). MOUNTING Unit to be set on support brackets hung by threaded rod type apparatus. (brackets and rod not provided.) CASE 20 gauge prepainted galvanized steel (G60) for superior corrosion resistance. Insulated with foil faced insulation duct liner where required to prevent exterior condensation. Drain connections; two - 1/2" (12 mm) O.D. CONTROLS Illuminated power switch, 3 speed blower control, low voltage (24 VAC) terminals for connection of remote dehumidistat (supplied) and defrost light indicating automatic operation. DEFROST Supply bypass routes indoor air to defrost core. WEIGHT 142 lbs. (64.4 kg) SHIPPING WEIGHT 167 lbs. (75.8 kg) , PERFORMANCE
TOTAL CURRENT DRAW (AMPS) @ 120 VAC AIRFLOWS (Each Air Stream)
423 (900) AIRFLOW L/s (CFM) 378 (800) 329 (700) 282 (600) 235 (500) 190 (400) 143 (300) 94 (200) 42 (100)
25 (.1) 50 (.2) 75 (.3) 100 (.4) 125 (.5) 150 (.6) 175 (.7) 5.5 HIGH HIGH SPEED MED SPEED LOW SPEED 5.0 MED 4.7 LOW EXTERNAL STATIC PRESSURE IN PASCALS (IN. W.C.) TEMPERATURE EFFECTIVENESS
EFFECTIVENESS 70% 60% 50%
NOTE: Exhaust Relative Humidity (RH) at 40%
143 (300) 190 (400) 235 (500) 282 (600) 329 (700) AIRFLOW IN L/s (CFM) DIMENSIONS ERV700DD POOL mm (inches) DIMENSIONS 700DD POOL mm (inches)
SUPPLY AIR FROM OUTSIDE POOL AND DEFROST AIR
NOTE:
Service clearance is 760 mm (30 in.) from front access doors EXHAUST AIR TO OUTSIDE CONTROLS MOUNTING POINTS 356 mm (14") 165 mm (6 1/2") 165 mm (6 1/2") 356 mm (14") 625 mm (24 5/8 ") 210 mm (8 1/4") 159 mm (6 1/4") ¤ 200 mm (8") 200 mm (8") EXHAUST AIR FROM POOL
DRAIN CONNECTION HEAT RECOVERY VENTILATORS (HRVs) SUPPLY AIR TO BUILDING 753 mm (29 5/8") 730 mm (28 3/4") 730 mm (28 3/4") FRONT VIEW DISCHARGE SIDE
WARRANTY INLET SIDE All units conform to CSA and UL standards. All units carry a 2 year warranty on the energy recovery cores and replacement parts. DATE: __________UNIT SELECTED:____________________ PROJECT: ________________________________________ MECHANICAL CONTRACTOR: __________________________
3 SN-104 0112 Model ERV1200DD POOL
SPECIFICATIONS
CORES Modular (3 section) patented aluminum energy recovery cores arranged for efficient cross-flow ventilation. Meets the flame spread and smoke developed classifications of the National Building Code and NFPA 90A (1993 Edition). MOTORS Two PSC, 3 speed double shafted, 120 VAC, 4 Amps each (8.1 total on high speed). HP - 1/4, 1625 RPM. Watts - total on high speed - 972. FILTERS Washable air filters in exhaust and supply air streams. BLOWERS Centrifugal type rated at 1200 cfm (566 L/s) free air delivery. Each air stream has one double shafted motor driving a centrifugal blower. CONNECTION DUCT SIZES Five - 20" x 8" H (508 mm x 200 mm H). MOUNTING Unit to be set on support brackets hung by threaded rod type apparatus. (brackets and rods not provided). CASE 20 gauge prepainted galvanized steel (G60) for superior corrosion resistance. Insulated with foil faced insulation duct liner where required to prevent exterior condensation. Drain connections; two - 1/2" (12 mm) O.D. CONTROLS Illuminated power switch, 3 speed blower control, low voltage (24 VAC) terminals for connection of remote dehumidistat (supplied) and defrost light indicating automatic operation. DEFROST CONTROLS Supply bypass damper routes indoor air to defrost core. WEIGHT 191 lbs. (87 kg) SHIPPING WEIGHT 215 lbs. (98 kg)
AIRFLOW L/s (CFM) 613 (1300) 566 (1200) 518 (1100) 472 (1000) 423 (900) 378 (800) 329 (700) 282 (600) 235 (500)
25 (.1) 50 (.2) 75 (.3) 100 (.4) 125 (.5) 150 (.6) 175 (.7) EXTERNAL STATIC PRESSURE IN PASCALS (in. W.C.) 8.1 HIGH PERFORMANCE
AIRFLOWS (Each Air Stream)
TOTAL CURRENT DRAW (AMPS) @ 120 VAC HIGH SPEED 7.8 MED MED SPEED 7.1 LOW LOW SPEED TEMPERATURE EFFECTIVENESS
EFFECTIVENESS 70% 60% 50% NOTE: Exhaust Relative Humidity (RH) at 40%
235 (500) 282 (600) 329 (700) 378 (800) 423 (900) 472 (1000) 518 (1100) 566 (1200) AIRFLOW IN L/s (CFM) DIMENSIONS ERV1200DD POOL mm (inches) DIMENSIONS 1200DD POOL mm (inches)
SUPPLY AIR FROM OUTSIDE POOL AND DEFROST AIR EXHAUST AIR TO OUTSIDE
CONTROLS MOUNTING POINTS 508 mm (20") 263 mm (10 3/8") 263 mm (10 3/8") 508 mm (20") NOTE: Service clearance is 760 mm (30 in.) from front access doors 172 mm (6 3/4") 625 mm (24 5/8 ") 159 mm (5 7/8") ® 200 mm (8") 200 mm (8") EXHAUST AIR FROM POOL
DRAIN CONNECTION HEAT RECOVERY VENTILATORS (HRVs) 759 mm (29 7/8") FRONT VIEW SUPPLY AIR TO BUILDING 1055 mm (41 1/2") 1055 mm (41 1/2") DISCHARGE SIDE INLET SIDE All units are CSA and UL standards. WARRANTY
All units carry a 2 year warranty on the energy recovery core and replacement parts. DATE: __________UNIT SELECTED:____________________ PROJECT: ________________________________________ MECHANICAL CONTRACTOR: __________________________
4 SN-121 0112 Sizing your Pool Energy Recovery Ventilator
Determining ventilation requirements for Indoor Pool enclosures
There are two primary reasons to ventilate an indoor pool enclosure. One is to provide effective and efficient control of harmful humidity levels. The other reason is to control the Indoor Air Quality (IAQ) in the pool room enclosure. When an ERV system is adequately sized to control humidity, the IAQ will automatically be controlled for most situations. Therefore this ERV sizing guide will focus on the amount of moisture introduced into the air from the pool and the moisture removing capabilities of an ERV at various flow rates. Moisture removal capabilities
In addition to the amount of air being exchanged, moisture removal depends largely on the moisture content of both the inside and outside air. The trends below outline these principles. · The higher the indoor relative humidity, the larger the moisture removing capabilities. · The higher the indoor temperature, the larger the moisture removing capabilities · The lower the outdoor temperature, the larger the moisture removing capabilities. The amount of moisture evaporated from a pool is effected by:
1. Surface area of the pool 2. The water temperature 3. Indoor air temperature 4. Indoor relative humidity (R.H.) 5. The amount of activity in the pool room Detailed Calculation of Total Ventilation Requirements
The following charts and equations can be used to accurately size the ERV for a indoor pool application. At this time some decisions should be made with regards to: These short rules will help in understanding how these factors will effect moisture generation
1. Larger areas of water will evaporate greater amounts of water. (By using a pool cover the surface area of the pool will be reduced and will substantially reduce water evaporation.) 2. Higher water temperatures will increase water evaporation. 3. Lower indoor air temperatures will increase water evaporation. 4. Lower indoor relative humidity will increase water evaporation. 5. Activities in the pool will increase the water surface area, therefore water evaporation will increase. · Pool water temperature · Indoor air temperature · Relative humidity
It should be noted that the construction and quality of materials used in the construction of the pool room will influence the size of ERV required. High quality windows such as triple glazed, argon filled will allow a higher indoor humidity level before condensation will occur. A pool room built with loose construction techniques will have a higher natural ventilation rate than that of a room built to higher standards. It is recommended for all applications it is assumed there is no natural ventilation. The first table contains the evaporation rate of water based on the water temperature, room temperature, and room relative humidity. The second table contains the flowrate factor based on the indoor temperature, outdoor temperature, and room relative humidity. The total ventilation rate per square foot of water surface area is the result of these calculations. The total ventilation rate is this product multiplied by the water surface area. 5 Calculation
Note: As a general rule, if the water temperature is maintained at 80°F and the pool room air
temperature is maintained at 82°F, use a factor of 1 cfm/sq ft of pool surface or .5 cfm/sq ft of room area (whichever is greater) to determine amount of ventilation required. Example:
Pool surface area *Indoor design air temperature Pool water temperature Relative Humidity *Outdoor design air temperature 16' x 32' (512 sq ft) 83 °F 81 °F 50 % 15 °F * Always use design temperatures for indoor and outdoor air temperatures. Outdoor design temperatures are published by organizations such as ASHRAE. Do not us day to day temperatures for this calculation. 1. From Table 1, select the appropriate evaporation rate based on the room air temperature, water temperature, and relative humidity. Evaporation Rate = 0.052 2. From Table 2, select the corresponding flowrate factor depending on the indoor air temperature, outdoor temperature, and room relative humidity. Flowrate Factor = 21.70 3. Multiply the values obtained from step 1 and step 2 to obtain the minimum CFM required per square foot of pool surface area. Evaporation rate 0.052 X X Flowrate 21.70 = CFM / square foot of water surface area = 1.12 4. Multiply the value in step 3 by the area of the pool Area of pool 512 X X Value for step 3 1.12 = CFM = 573 System Installation
It is necessary to design and size the duct distribution system for both the supply and the exhaust air streams. Proper duct design will · Minimize air flow requirements · Ensure a comfortable environment by using reheat if required · Optimize humidity control, including eliminating condensation on windows by
blanketing the windows with airflow Please refer to sketch 1 and 2 for typical duct layouts. 6 TABLE 1
40% 50% 60% Evaporation Rate
Indoor Relative Humidity
40% 50% 60% 40% 50% 60% 40% 50% 60% 40% 50% 60% 40% 50% 60% Evaporation Rate lb/(sq. ft-hr.)
68 70 72 74 76 78 80 82 84 86 88
0.069 0.063 0.056 0.079 0.073 0.066 0.090 0.084 0.077 0.102 0.095 0.089 0.115 0.108 0.102 0.129 0.122 0.116 0.068 0.060 0.053 0.078 0.070 0.063 0.088 0.081 0.074 0.100 0.093 0.086 0.113 0.106 0.099 0.127 0.120 0.113 0.065 0.058 0.050 0.075 0.068 0.060 0.086 0.079 0.071 0.098 0.090 0.083 0.111 0.103 0.096 0.125 0.117 0.110 0.063 0.055 0.047 0.073 0.065 0.057 0.084 0.076 0.068 0.096 0.088 0.079 0.109 0.101 0.092 0.123 0.115 0.106 0.061 0.052 0.043 0.071 0.062 0.053 0.082 0.073 0.064 0.094 0.085 0.076 0.107 0.098 0.089 0.121 0.112 0.103 0.059 0.049 0.039 0.069 0.059 0.049 0.080 0.070 0.060 0.091 0.082 0.072 0.104 0.095 0.085 0.118 0.109 0.099 0.056 0.046 0.035 0.066 0.056 0.045 0.077 0.067 0.056 0.089 0.079 0.068 0.102 0.091 0.081 0.116 0.105 0.095 0.053 0.042 0.031 0.063 0.052 0.041 0.074 0.063 0.052 0.086 0.075 0.064 0.099 0.088 0.077 0.113 0.102 0.091 0.050 0.039 0.027 0.060 0.049 0.037 0.071 0.060 0.048 0.083 0.071 0.060 0.096 0.084 0.073 0.110 0.098 0.087 0.047 0.035 0.022 0.057 0.045 0.032 0.068 0.056 0.043 0.080 0.068 0.055 0.093 0.080 0.068 0.107 0.094 0.082 0.044 0.031 0.017 0.054 0.041 0.027 0.065 0.052 0.038 0.077 0.063 0.050 0.090 0.076 0.063 0.104 0.090 0.077 78 81 84 87 90 93 7 TABLE 2
40% 50% 60% Flowrate Factor
Indoor Relative Humidity
40% 50% 60% 40% 50% 60% 40% 50% 60% 40% 50% 60% 40% 50% 60% Flowrate Factor (cfa-hr./lb.)
-30 39.70 31.50 26.10 35.70 28.30 23.40 32.10 25.50 21.10 29.00 23.00 19.00 26.10 20.70 17.20 23.60 18.70 15.50 -25 40.20 31.80 26.20 36.10 28.50 23.60 32.40 25.70 21.20 29.20 23.10 19.10 26.30 20.90 17.20 23.80 18.80 15.60 -20 40.80 32.10 26.50 36.50 28.80 23.80 32.80 25.90 21.40 29.50 23.30 19.20 26.60 21.00 17.40 24.00 19.00 15.70 -15 41.60 32.60 26.80 37.20 29.20 24.00 33.30 26.20 21.60 29.90 23.60 19.40 26.90 21.20 17.50 24.20 19.10 15.80 -10 42.60 33.20 27.20 38.00 29.70 24.40 34.00 26.60 21.90 30.40 23.90 19.60 27.30 21.50 17.70 24.60 19.30 15.90 -5 43.90 34.10 27.80 39.00 30.40 24.80 34.80 27.10 22.20 31.10 24.30 19.90 27.90 21.80 17.90 25.00 19.60 16.10 0 45.70 35.10 28.50 40.40 31.20 25.40 35.90 27.80 22.70 32.00 24.80 20.30 28.60 22.20 18.20 25.60 20.00 16.30 5 48.10 36.50 29.40 42.30 32.30 26.10 37.40 28.70 23.20 33.20 25.50 20.70 29.50 22.80 18.60 26.30 20.40 16.60 10 51.50 38.40 30.60 44.90 33.80 27.00 39.40 29.80 24.00 34.70 26.40 21.30 30.70 23.50 19.00 27.30 21.00 17.00 15 56.20 41.00 32.20 48.50 35.80 28.30 42.10 31.40 25.00 36.80 27.60 22.10 32.40 24.50 19.60 28.60 21.70 17.50 20 63.40 44.70 34.50 53.70 38.50 30.00 46.00 33.50 26.30 39.70 29.30 23.10 34.60 25.70 20.40 30.30 22.70 19.10 25 74.90 50.10 37.60 61.70 42.50 32.40 51.80 36.40 28.10 44.00 31.50 24.50 37.80 27.40 21.50 32.70 24.10 19.00 30 95.90 58.70 42.30 75.30 48.50 35.80 61.00 40.80 30.60 50.50 34.70 26.40 42.50 29.80 23.00 36.20 25.90 20.10 35 60.50 43.20 33.60 51.60 37.40 29.40 44.50 32.70 25.80 38.60 28.60 22.70 33.70 25.20 20.10 29.70 22.40 17.90 40 69.20 47.50 36.10 57.80 40.60 31.30 49.00 35.00 27.20 42.00 30.50 23.90 36.30 26.70 21.00 31.60 23.40 18.60 45 83.60 53.90 39.70 67.50 45.20 33.90 55.80 38.40 29.20 46.90 33.00 25.40 39.90 28.50 22.20 34.30 24.90 19.50 50 110.90 64.00 45.00 84.30 52.10 37.70 66.70 43.30 32.00 54.40 36.50 27.40 45.20 31.20 23.70 38.20 26.90 20.70 55 180.30 82.40 53.30 119.20 63.60 43.30 86.90 50.90 36.00 67.00 41.80 30.30 53.60 34.90 25.90 44.00 29.60 22.30 60 686.30 124.20 68.10 232.30 86.0 52.60 134.70 64.30 42.20 92.30 50.40 34.60 68.60 40.80 28.90 53.60 33.70 24.50 68 71 74 77 80 83 8 Installation Diagrams
EXPOSED WALL EXPOSED WALL EXPOSED WALL Blanket exposed windows with fresh dry air Main Stale Air Intake ERV HRV EXPOSED WALL Min. 10'-0" Typical Duct Layout Sketch #1 Always attempt to minimize short circuiting of air streams, (supply fresh air on one side of room and exhaust stale air from opposite side of room). 9 EXPOSED WALL EXPOSED WALL INTERIOR WALL Blanket exposed windows with fresh dry air Stale Air Intake ERV HRV EXPOSED WALL Min. 10'-0" Typical Duct Layout Sketch #2 Always attempt to minimize short circuiting of air streams, (supply fresh air on one side of room and exhaust stale air from opposite side of room). 10 Location for Mounting
The ERV must be located in a heated space where the surrounding air temperature does not fall below 60°F (16°C). The unit must be mounted level (horizontal) to obtain proper drainage or water from the energy exchange element and drip pans. The warranty will be void if these conditions are not met. Typically, the ERV is positioned close to an outside wall or the roof to simplify the connections and keep the length of insulated ducting required for the fresh air intake to a minimum. A minimum clearance of 30 inches (76 cm) in front of the ERV is recommended to service the energy exchanger cores and the filters. The ERV may be mounted on an equipment platform providing the drain hoses are clear and there is sufficient space to open the doors for servicing. Install the drain pans in the bottom of the ERV so the drain connections protrude through the holes provided. Use drain hoses with hose clamps to connect the drain pan outlets to a floor drain or standpipe. Make sure the drain line slopes down to the outlet. If this is not possible a condensate pump will be required for positive removal of the water. Protect the drain line from freezing. The Ductwork System
A properly designed ducting system will allow the ERV to operate at its maximum efficiency. (Air flow will be restricted by undersized ducting, use of too many elbows, tees, bends, etc.). Always try to keep duct runs as short and straight as possible. NOTE: Fully insulated ducting with an integral vapour barrier must be used on all runs passing through unheated areas in order to avoid condensation problems and energy losses from the air steams. All joints must be airtight, sealed and impervious to moisture. See specification sheets for each unit for exact duct sizes and location. To minimize pressure drop and noise, galvanized metal ducts, properly sized, are recommended. Keep ducting as short as possible and use a minimum of elbows and tees. Connecting sections and shorter runs may be flexible ducting one size larger than the metal equivalent. Use flexible duct connectors at the ERV to avoid noise transmission. All duct joints must be secured with screws, rivets or duct sealant and sealed with aluminum duct tape to prevent leakage. HRV CABINET DRAIN SPOUT TAPE DRAIN SPOUT TEE CONNECTOR TO DRAIN Forming the "P" Trap 11 Outside Weatherhoods
The weatherhoods must have built-in "bird" screen with 1/4 in (6.35 mm) minimum mesh to prevent birds and rodents from entering into the ductwork. Do not use smaller mesh as it will be very susceptible to plugging up. Gravity dampers at the vents must not be used as they will restrict air flow and often "seize up". The preferred location of the outside weatherhoods is: · no less than 10 ft. (3 m) apart from each other · at least 18 in ( 46 cm) above snow line or ground level · away from sources of contaminants, such as automobile exhaust fumes, gas meters, garbage cans, containers, etc. · not exposed to prevailing winds, whenever reasonable possible The outside perimeter of the weatherhood must be caulked to prevent leakage into the building. The design and size of the weatherhoods or louvres chosen by the installer must allow for adequate free area. Water and snow penetration of the system is minimized when the airflow does not exceed 1000 FPM (5.08 m/s) free area velocity. All duct joints must be fastened with screws, rivets or duct sealant and wrapped with a quality duct tape to prevent leakage. We recommend aluminum foil tape. Stale Air Return System
The stale air return system is used to draw air from the points in the building where the worst air quality problems occur. Balancing dampers and/or adjustable grilles are recommended on all return air lines which are used during installation to help balance the "draw" from different areas of the building. Alternately, the stale air may be drawn directly from the return air duct. When this system is used, the air handler's blower must constantly operate. The exhaust takeoff connection must be at least a 3 ft (1 m) from a directly connected ERV supply duct if both are connected to the same duct run. Static pressure of the air handlers return system should be noted and compensated for if, it is apparent that the static pressure of the return in the air handler will exceed .1 to .15" W.C. A damper located just prior to the ERV is required to balance the stale air exhausted with the fresh air supply entering the building. Return air suction points should be located on the opposite side of the room from the fresh air inlet. The inlets may be located in the ceiling or high on the walls and fitted with inlet grilles. Many commercial activities produce air contaminants in the form of dusts, fumes, mists, vapours and gases. Contaminants should be controlled at the source so that they are not dispersed through the building nor allowed to increase to toxic concentration levels. The ventilator allows for economical operation of the HVAC system while effectively removing contaminants from the space. In designing the exhaust portion of the system the exhaust grilles are placed so as to remove the contaminants while not allowing them to enter the breathing zone of the occupants. For contaminants that are lighter than air, grilles should be located high on the wall. If contaminants are heavier than air, a lower placement of the grilles will be required. Information on a contaminants specific gravity and toxicity should be available from chemical data sheets.
12 Ducting from the Weatherhoods
Galvanized sheet metal ducting with sufficient cross section with an integral single piece vapour barrier should be used to connect the ERV to the weatherhoods. All ducting must meet UL Class 1 requirements. A minimum R value of insulation should be equal to 4 (RSI 0.75) A good bead of high quality caulking (preferably acoustical sealant) and taping with a high quality aluminum foil tape is recommended to seal the duct to both the ERV and the weatherhood. Warmside Ducting - General
Ducting from the ERV to the different areas in the building should be galvanized metal whenever possible. To minimize airflow losses in the ductwork system, all ducts should be as short as possible and with as few bends or elbows as possible. 45° elbows are preferred to 90° elbows. Use "Wye" (Y) fittings instead of "Tees" (T) whenever possible. Fresh Air Supply System
The fresh air supply ductwork from the ERV may be directly connected to the return air duct of the forced air system. Check the air flow balance of the ERV with the air handler blower both "ON" and "OFF" to determine that it does not imbalance the ERV more than 10%. Also, it is advisable to include a short length of flex duct or other non-metallic connector in this hard ducted line in order to keep the ERV acoustically isolated and separately grounded (electrically) from the air handler. This will avoid a possible shock hazard to service people if a short to ground develops in one of the devices. It may be necessary to install a separate fresh air supply ductwork system if the heating is other than forced air. When installing an ERV, the designer and installer should be aware of local codes that may require smoke detectors and/or firestats in the HVAC or ERV ductwork. Because an ERV is designed to bring fresh air into the building, structures may require supply voltage interrupt when smoke or flame sensors are triggered, or when a central fore alarm system is activated. Supply air grilles may be ceiling or high wall mounted. Avoid locating incoming fresh air grilles that could cause a direct draft on the occupants as the incoming air may be below room temperature. A reheat duct heater can be installed to improve occupant comfort. The use of balancing dampers or adjustable grilles to balance the flow rates into various rooms is recommended. The use of balancing dampers or adjustable grilles as supply air diffusers and air exhaust covers are recommended. TECHGRILLESTM are round, efficient, sound absorbing devices available in 4", 5", 6" and 8" (100, 125, 150, and 200 mm) models. AIR FLOW SUPPLY AIR FLOW EXHAUST TECHGRILLE
(optional) schematic 13 Various Installation Types
NOTE: Figure 7A
Saddle Installation When installing your ERV flexible duct connectors should be installed between the ERV and the galvanized duct work. Vibration Isolators (Supplied by others) Threaded rod and U channel (Supplied by others) Hang unit with suspended rods and "U" channel members. Figure 7B
Curb Mounted Curb is wood or metal (Supplied by others) May be anchored to floor,leaving space for drain connections Figure 7C
Suspended
PVC Support Straps (Supplied by others) Mount unit on wooden or metal curb assembly. Unit must be raised an adequate height for installation and slope of drain lines. Vibration Isolators (Supplied by others) Unit Suspended using Polyester reinforced PVC support straps. 14 Electrical Connections
It is recommended that a licensed electrician make all electrical connections. It is very important that the unit be properly grounded. It is recommended that a separate 15 amp/120 volt circuit be used. WARNING: In order to prevent electric shock when cleaning or servicing the ERV, it is extremely important to confirm the polarity of the power line that is switched by the safety (disconnect) switch whose control arm is located on the outside of the electrical control box area. The hot line (black) is the proper line to be switched. To confirm the proper polarity, use a voltmeter or test lamp to make sure there is no power after the switch when the door is open. Check between that point and ground (on the cabinet). This must be done as occasionally some buildings are improperly wired. Always make sure the ERV is properly grounded. Automatic Self Test of Defrost Systems
If confirmation of the defrost system is needed, complete the following steps. 1. Disconnect power to the unit and open access/ maintenance doors. 2. Locate the "snap disc" type temperature sensor mounted in the upper left hand corner (cold air stream) of the ERV. 3. Disconnect the two wires from the ERV to the sensor, at the sensor. 4. Using a jump wire with alligator clips, join two wires from the ERV together. 5. Close access doors and power the unit. This procedure will simulate a defrost that would occur automatically in the field when the outside temperature drops below -3°C (27°F). Black Line White Power Supply Cord Power Terminal Block. GND. Electrical Connection DAMPER DEFROST
These damper defrost ERV's have an electronically controlled damper defrost mechanism. If the outside temperature drops below 27°F(-3°C ), the defrost timer is activated. A motor driven damper door mechanism opens the defrost port and at the same time closes off the supply air from outside. After approximately 3 minutes, the damper operates in the opposite direction to close off the defrost port and reopen the fresh air at the supply port. The 27.5 minute wait time and 3 minute defrost cycle repeat until the temperature again rises above 27°F (-3°C). Gr Black Neut. een 15 OPERATION of the ERV
These Recirculating Models of ERV's will provide fresh clean air without sacrificing the savings of your energy conserving home. When outdoor air is required for pool room dehumidification, the aluminum cores of the ERV provide effective and efficient energy recovery exchange. Whether operating as an ERV or in recirculation mode, the energy efficient PSC blower motors provide reliable and cost effective operation. The exhaust fan to the outside is shut off during this time. Outside air does not enter the system until the pool room humidity exceeds the setpoint of the dehumidistat. The unit has an electronically controlled damper door defrost. If the dehumidistat has made its circuit and the unit is drawing in outside air, the defrost cycle will operate as follows: If the outside temperature drops below 27° Fahrenheit (-3 degrees Celsius) the defrost timer is activated. After waiting approximately 27.5 minutes (during which time the core unit may experience some frost build-up) the timer activates the damper door mechanism which closes off the fresh air supply port and opens the defrost port. After approximately 3 minutes the damper door reverses direction and re-opens the fresh air supply port and closes off the defrost port. This cycle repeats until the outside temperature again rises above 27° F. During the defrost cycle, pool room air is moved outside through the unit as well as from the pool room, back to the pool room. To handle the required air flow capacity, two ducts need to be connected to the pool room or one large duct. Operation:
Humidity control is provided by an adjustable dehumidistat that is mounted in the pool room. The dehumidistat (supplied and mounted in the pool room in an accessible location 5' above floor level) would be set to a humidity level the operator finds acceptable (for example, in a range of 45 to 55% R.H.). If the humidity level in the room exceeds the setting of the dehumidistat, then outside air is brought into the system and humid air is removed from the room. If a duct heater or hot water coil has been installed in the supply ductwork, this will condition the incoming air. Control of this heater would be by a duct mounted thermostat. When the humidity level of the room falls to the dehumidistat setpoint, the pool room air is recirculated and no outside air will enter the system. Pool room air moves through the unit, then to the duct heater (optional) and returns to the pool room. Outside air is prevented from entering the unit during recirculation by the supply damper closing off. 16 Ducting Requirements & Mode of Operation
Ventilation Mode
In ventilation mode, both motors are running and air is being exchanged with the outside through the supply and exhaust ducts. Defrost Mode
In defrost mode both the supply and exhaust motors run to draw air through the energy exchange cores. This mode is automatic and does not require field adjustments. Defrost light on side of cabinet illuminates to indicate defrost operation. Recirculation Mode
In recirculation mode the supply motor continues to run and a damper moves to block off air entering from outside, drawing air instead from the conditioned space. The exhaust to outside motor is OFF when in recirculation mode. *NOTE: "Defrost" light is illuminated during "Recirculation Mode", indicating damper direction. 1. VENTILATION MODE
FRESH AIR FROM OUTSIDE EXHAUST TO OUTSIDE FROM POOL ROOM (CLOSED) Ø ON FROM POOL ROOM ON TO POOL ROOM 2. RECIRCULATION MODE
Ø
FROM POOL ROOM OFF FRESH AIR FROM OUTSIDE (CLOSED) EXHAUST TO OUTSIDE Ø FROM POOL ROOM Ø ON TO POOL ROOM 3. DEFROST MODE
Ø
FROM POOL ROOM ON FRESH AIR FROM OUTSIDE (CLOSED) EXHAUST TO OUTSIDE ON FROM POOL ROOM TO POOL ROOM NOTE: The external low voltage contacts on a pool unit control the Ventilation/ Recirculation Damper only, not low/high speed control. 17 Speed Selection and Controls
These recirculation models are equipped with a 3 speed control, low medium and high, (Note - 1000RHC/RHCAC must be set to high speed when air conditioning is required), as well as a lighted on/off switch and a low voltage terminal strip. The low voltage terminal strip is used to connect the supplied dehumidistat. DEHUMIDISTAT END OF UNIT not used ON/OFF SWITCH 3 SPEED CONTROL tat Dehumidis e to Relativ Setting Conditions Outside HIGH COMMON ON/OFF : WINTER at umidist . Set deh 30% to 40% between is too dry, If home ing. higher sett adjust to too humid, is ing. If home lower sett adjust to : SUMMER at umidist Set deh to OFF. PART NO. 99-130W ·Provides ventilation or recirculation mode * NOTE: The external low voltage contacts on a pool unit control the Ventilation/Recirculation Damper only, not low/high speed control. 18 PITOT TUBE AIR FLOW BALANCING
It is necessary to have balanced air flows in an ERV. The volume of air brought in from the outside must equal the volume of air exhausted by the unit. If the air flows are not properly balanced, then; · The ERV may not operate at its maximum efficiency · A negative or positive air pressure may occur in the house · The unit may not defrost properly · Failure to balance ERV properly may void warranty Excessive positive pressure may drive moist indoor air into the external walls of the building where it may condense (in cold weather) and degrade structural components. May also cause key holes to freeze up. Excessive negative pressure may have several undesirable effects. In some geographic locations, soil gases such as methane and radon gas may be drawn into the home through basement/ground contact areas. Excessive negative pressure may also cause the backdrafting of vented combustion equipment. Read the Application Warning on the front of this manual! For general balancing it is sufficient to move the pitot tube around in the duct and take an average or typical reading. Repeat this procedure in the other (supply or return) duct. Determine which duct has the highest airflow (highest reading on the gauge). Then damper that airflow back to match the lower reading from the other duct. The flows should now be balanced. Actual airflow can be determined from the gauge reading. The value read on the gauge is called the velocity pressure. The Pitot tube comes with a chart that will give the air flow velocity based on the velocity pressure indicated by the gauge. This velocity will be in either feet per minute or metres per second. To determine the actual airflow, the velocity is multiplied by the cross sectional area of the duct being measured. This is an example for determining the airflow in a 6" duct. The Pitot tube reading was 0.025 inches of water. From the chart, this is 640 feet per minute. The 6" duct has a cross sectional area of = [ 3.14 x (6"÷12)2] ÷4 = 0.2 square feet The airflow is then: 640 ft./min. X 0.2 square feet = 128 cfm For your convenience, the cross sectional area of some common round duct is listed below: Prior to balancing, ensure that:
All sealing of the ductwork system has been completed. All of the ERV's components are in place and functioning properly. Balancing dampers are fully open. Unit is on HIGH speed. Air flows in branch lines to specific areas of the house should be adjusted first prior to balancing the unit. A smoke pencil used at the grilles is a good indicator of each branch line's relative air flow. 6. After taking readings of both the stale air to the ERV duct and fresh air to the house duct, the duct with the lower CFM ([L/s] velocity) reading should be left alone, while the duct with the higher reading should be dampered back to match the lower reading. 7. Return unit to appropriate fan speed for normal operation 1. 2. 3. 4. 5. DUCT DIAM. (inches) 5 6 7 CROSS SECTION AREA (sq. ft.) 0.14 0.20 0.27 The accuracy of the air flow reading will be affected by how close to any elbows or bends the readings are taken. Accuracy can be increased by taking an average of multiple readings as outlined in the literature supplied with the Pitot tube. BALANCING PROCEDURE
The following is a method of field balancing an ERV using a Pitot tube, advantageous in situations when flow stations are not installed in the ductwork. Procedure should be performed with the ERV on high speed. The first step is to operate all mechanical systems on high speed, which have an influence on the ventilation system, i.e. the ERV itself and the forced air furnace or air handler if applicable. This will provide the maximum pressure that the ERV will need to overcome, and allow for a more accurate balance of the unit. Pitot tube and gauge DUCT
AIR FLOW Pitot tube Pitot Tube Air Flow Balancing Kit
c/w magnehelic gauge, Pitot tube, hose and carry case. PART NO. 99-167 Magnehelic gauge
MAGNEH ELIC Drill a small hole in the duct (about 3/16"), three feet downstream of any elbows or bends, and one foot upstream of any elbows or bends. These are recommended distances but the actual installation may limit the Place pitot tube a minimum of 18" from blower or elbows amount of straight duct. The Pitot tube should be connected to a magnehelic gauge or other manometer capable of reading from 0 to 0.25 in. (062 Pa) of water, preferably to 3 digits of resolution. The tube coming out of the top of the pitot is connected to the high pressure side of the gauge. The tube coming out of the side of the pitot is connected to the low pressure or reference side of the gauge. Insert the Pitot tube into the duct; pointing the tip into the airflow.
19
HRV must be in ventilate mode when balancing proceedure is performed Outdoors Pitot tube Magnehelic gauge Magnehelic gauge
MAGNEHELIC MAGNEHELIC Pitot tube Note: Duct connections may vary, depending on model. SERVICE/MAINTENANCE
Servicing your ERV on a regular schedule will result in optimum operating efficiencies and prolonged life of the equipment. Due to numerous applications in which this equipment can be installed, it is difficult to predict servicing intervals. In certain situations where there is heavy smoke, servicing the equipment every one two months may be needed; whereas ventilating a meeting room for example for carbon dioxide may only need service every six months to a year. ERV CORE
The energy exchange core is accessible through the front service door. Special care and attention should be given to this component as the edges may be sharp, and the core itself susceptible to damage if dropped. When removing the core, the location it is removed from should be noted. The core is removed by carefully pulling the core outward from the unit, sliding it evenly along its "H channel" supports found in each corner of the core. Note the core may have some resistance when sliding out. Avoid tilting the core as this will result in its edges catching the H channel and temporarily preventing its removal. In most cases, washing the core in a mild detergent and warm water will be all that is needed to completely clean them. Do not use harsh chemicals as this may cause corrosion in the ERV. The time between core service will depend on the application the ERV has been installed in. It can be as often as one - two months or at the very least, cleaned every six months. When reinstalling the core you must note foam location and drip edge location for proper core placement. See diagram below. MOTOR
Access to the motor is through the front service doors. Note energy exchanger core can be removed to provide more room. See CORE in this section. The motor is a permanent split capacitor type (PSC) which uses a sleeve mechanism to steady the shaft. There is an oil wick beside the sleeve which supplies oil to it on a continuous basis. If the motor does not have oil tubes, no maintenance is required. Access to the wick is through oil tubes, (two per motor) located in the motor case itself. These oil tubes are either capped with yellow plugs, (which need to be removed for oiling) or have clear tubes protruding from them. In either case an oiling device such as an "Oil Telespout" filled with 20 S.A.E. non-detergent electric motor oil should be used to put oil inside the tubes. A couple of drops of oil once a year will do. DO NOT OVER OIL! Models 700, 1200 1200 Models 700, and 1000
FILTER DOUBLE DRIP EDGE CORE FILTER DOUBLE DRIP EDGES DRAIN PANS Note location and arrangement of cores and filters when removing.
20 FILTERS
Open front service door to access the filters located in both supply and exhaust air streams. Note to remove and install filters, it may be easier to first remove the core(s). See CORE. The filters are designed to stop large particles from entering in the core. The filters are fastened in place by a metal spring rod. To remove filters from core(s) simply pull the rod from one end, outward until free from core lip, and remove. Only use warm water with a mild detergent to wash the filters. Do not use harsh chemicals. The time between filter service will depend on the application the ERV has been installed in. It can be as often as one - two months or at the very least, cleaned every six months. DUCT WORK
It is a good idea to inspect ducting, outside weather hoods (wall caps), and grilles for blockage and dirt buildup, at least every six months. Outside weather hoods should be protected by a rodent screen which can plug up with debris. Also, it is a good idea to visually confirm that the fresh air supply is free from any sources of contamination, such as other vented combustion equipment added after the fact. DAMPER MOTOR
The damper motor, (if applicable) is a self contained motor and does not require service. The damper door attached to the motor could use a little lithium grease on the shaft opposite the motor, where it enters its holder, once every two - three years. CONDENSATE DRAINS
The condensate drains consist of two drain pans which may collect water after the ERV initiates a defrost cycle, and a drain line to remove the condensate. Maintenance on this portion of the system should be done as often as possible and should not exceed six months. Note bacterial growth in standing water is a major concern to healthy indoor air quality, and should be avoided whenever possible. To clean these components, open the front service door and flush the pans with water. Ensure that the pans drain completely and in a reasonable amount of time. Note if the water does not drain right away, check for blockage in the drain line, also check that the drain line has a good slope to it. (1/8 - 1/4" per foot) The drain line itself should have a "P" trap in it below the ERV which is to be filled with water to prevent odours or gases from entering back into the unit. When flushing out the drain pans, this too will be flushed out, and the water that was there will be replaced with clean water. General Maintenance
As a final step in a routine maintenance schedule, it is a good idea to confirm operation of the system, checking speed control functions and remote control operation, if applicable. Wipe the inside of the cabinet to remove dust and cob webs as needed. It is a good idea to keep a service/maintenance log of the unit. 21 TROUBLESHOOTING YOUR ERV SYSTEM
SYMPTOM
Poor Air Flows CAUSE
· 1/4" (6 mm) mesh on the outside hoods is plugged · filters plugged · core obstructed · house grilles closed or blocked · dampers are closed if installed · poor power supply at site · ductwork is restricting ERV · improper speed control setting · ERV airflow improperly balanced · poor location of supply grilles, the airflow may irritate the occupant · outdoor temperature extremely cold SOLUTION
· clean exterior hoods or vents · remove and clean filter · remove and clean core · check and open grilles · open and adjust dampers · have electrician check supply voltage at house · check duct installation · increase the speed of the ERV · have contractor balance ERV · locate the grilles high on the walls or under the baseboards, install ceiling mounted diffuser or grilles so as not to directly spill the supply air on the occupant (eg. over a sofa) · turn down the ERV supply speed. A small duct heater (1kw) could be used to temper the supply air · placement of furniture or closed doors is restricting the movement of air in the home · if supply air is ducted into furnace return, the furnace fan may need to run continuously to distribute ventilation air comfortably · check that the correct terminals have been used · check external wiring for a short · set the dehumidistat at the desired setting · set dehumidistat lower · cover pools, hot tubs when they are not in use · avoid hanging clothes to dry, storing wood and venting clothes dryer inside. Heating wood may have to be moved outside · vent crawl space and place a vapour barrier on the floor of the crawl space · ducts from the washroom should be sized to remove moist air as effectively as possible, use of a bathroom fan for short periods will remove additional moisture · on humid days, as the seasons change, some condensation may appear but the homes air quality will remain high with some ERV use · increase speed of the ERV · set dehumidistat higher · decrease ERV blower speed · humidity may have to be added through the use of humidifiers · have a contractor balance ERV airflows · Note: minimal frost build-up is expected on cores before unit initiates defrost cycle functions · have HVAC contractor balance the ERV · using the self-test feature at the Base Module, press the fan control symbol, the damper defrost unit should cycle its full travel when working properly. · tape and seal all joints · tape any holes or tears made in the outer duct covering · ensure that the vapour barrier is completely sealed · ensure O-Ring on drain nozzle sits properly · look for kinks in line · check water drain connections · make sure water drains properly from pan Supply air feels cold Dehumidistat is not Operating · improper low voltage connection · external low voltage is shortened out by a staple or nail · check dehumidistat setting it may be on OFF · dehumidistat is set too high · ERV is undersized to handle a hot tub, indoor pool,