PLUS C E N T R A L LY D U C T E D O F F - P E A K H E AT I N G
MANUFACTURED IN NORTH AMERICA PLUS
SERIES SERIES Off-Peak Heating Typical Annual Heating Costs Example
(based on a 45,000 BTU/hr heat loss home) Annual costs in your area will vary depending on climate, electric rates, heating fuel costs, etc.
1,600.00 1,400.00 1,200.00 1,000.00 800.00 600.00 400.00 200.00
H RD EA T RE PU SI M ST P O TH AN W ER CE / M AL HE AT PU CO M P M ST AN The Steffes Comfort Plus Series heating systems are a type of Electric Thermal Storage (ETS) equipment which utilize low cost, off-peak electricity to provide economical and comfortable heating. ETS systems convert electricity to heat during off-peak hours and store that heat in specially designed ceramic bricks. Off-peak hours are those times during the day or night when electricity is plentiful and the electric power company can supply it at a lower cost. Power companies generally offer substantial discounts in rates (up to 40% or greater), for electricity used during off-peak hours. With this rate discount, consumers can realize significant savings in their energy bills when compared to alternative heating options. many sensing devices monitor brick core and discharge air temperatures to ensure maximum safety, even heat distribution, and optimum comfort. Heat Pump Systems Fossil Fuel Systems Operation US PA N PL O RT EL O L G AS Operation of the Comfort Plus is completely automatic. A sensor monitors outdoor temperature to regulate the amount of heat the system stores in its brick core. The wall thermostat, along with the duct sensor in the Comfort Plus, controls heat delivery to ensure a warm and comfortable room temperature 24 hours a day. E IL AT U Optional Variable Speed Blower
The variable speed ECM blower option provides extra comfort as well as cost savings. To ensure the system always delivers warm air, when it first starts-up there is a delay on the indoor blower until only warm air can be delivered. In addition, with variable speed, air is constantly pulled from all parts of the building, mixed and redistributed. The result is a more consistent, even temperature from floor-to-ceiling, room-to-room and floor-to-floor. In addition to providing a more comfortable environment, the variable speed option is much more efficient in operation. Because it consumes less energy, it will cost substantially less to operate than a typical, standard blower system. With the variable speed blower option, you can enjoy more consistent temperatures, quieter operation, and money-saving energy efficiency all year long. FO PR FU DA Applications The versatility of Comfort Plus systems allow them to fit almost any application whether it be in new construction or as a direct replacement for an existing centrally ducted system (fossil fuel or electric furnace). They are designed for use as either the sole heating source ("stand alone" furnace) or as a supplement to ducted heating systems such as heat pumps. The Comfort Plus/Heat Pump system offers many significant benefits:
· Provides for a high efficiency, low cost heating and cooling system all in one. Optimizes system performance by allowing the heat pump's efficiency to be fully utilized. Eliminates cool and uncomfortable discharge air temperatures associated with heat pump systems during cool outdoor temperatures. · · Heat Pump Booster
Heat pumps are known for providing very efficient, low cost heating and cooling. However, during colder outdoor temperatures, traditional heat pumps often times do not deliver acceptable comfort. With the Steffes Comfort Plus unit, you can be assured good comfort while optimizing the heat pump's efficiency. As replacement to the electric resistance strip heat, which is typically used to supplement or back-up heat pump systems, the Comfort Plus unit adds the precise amount of off-peak, stored heat needed to ensure constant, even and comfortable air is being delivered 24 hours a day. During on-peak hours or when the demand for heat is at the point where the heat pump's capacity alone cannot satisfy the heating requirements, the Comfort Plus unit uses its stored, off-peak heat to supplement the heat pump output. Utilizing a Comfort Plus unit with a heat pump, in conjunction with an off-peak electric rate, has proven to be one of the most economical heating and cooling systems available. "Stand-Alone" Furnace
The large storage capacity of the Comfort Plus unit allows this system to be used as the sole heating source for an entire heating application. The unit can easily accommodate most standard auxiliary devices such as an air conditioner, electronic air filter, central humidifying systems, etc. As a stand-alone central furnace, the Comfort Plus unit provides low cost, off-peak, stored heat as needed to satisfy heating requirements 24 hours a day. Its GE N RA Benefits The Comfort Plus system allows heating requirements to be satisfied using off-peak electricity (if available from your power company); thus, significant savings in heating costs can be realized. In addition, it offers great safety and reliability with minimal maintenance. With off-peak heating, you will enjoy stable electric rates and superior comfort for many years to come. COMPONENTS OF A COMFORT PLUS
1 Return Air Plenum
3100: provided with unit 4100: separately ordered or installer supplied
(right or left side mounting)
WAR M DISC HAR GE AIR (right side mounting only) 5 6
RETURN AIR 68º 2 3 Return Air Inlet Air Conditioner or Heat Pump Indoor Coil
(installer supplied) 7 8 9 4 Air Filter
(Provided with return air plenum.) STORED OFF-PEAK HEAT 2 5 Supply Air Outlet
(4100: bottom right or left side) 4 10 3 11
HEAT PUMP COIL 6 Insulation
Super-insulated to ensure low surface temperatures along with a doublewall cabinet design to minimize static heating. 7 Circuit Breakers
Element and controls circuit breakers are built in to every system to eliminate the need for a separate service disconnect. 1 12 8 Microprocessor Control Panel and Operating Display
This state-of-the-art, intelligent control system provides complete programmability of the system to allow for customization to user and power company immediate and future needs, as well as diagnostic testing through the operating display panel. COMFORT PLUS CONDITIONED AIR 95º HEAT PUMP CONDITIONED AIR 85º SERIES 9 Heating Elements
Incoloy sheathed, low-watt density for long life. OTHER FEATURES
· 10 Heat Storage Bricks Specially designed to store vast amounts of heat for use 24 hours a day. 11 Electrical Compartment 12 Supply Air Blower PSC motor in standard configuration. High efficiency ECM variable speed option available for even greater comfort and cost savings. Built-in power line carrier receiver for wireless communication of information such as peak control signals and outdoor temperature for automatic brick core charge control. Selectable freeze protection and peak override temperature set points (power company permitting). Adjustable charge delay allows the furnace to be staged ON at the end of a peak control period or power outage to minimize voltage fluctuations. · Minimizes transformer overloading and reduces shoulder peaking situations by energizing only the minimum number of elements required to achieve core charging requirements. Built-in auxiliary load control capability for devices such as an air conditioner, water heater, etc. Time clock module for peak control signaling purposes (optional). Completely automatic, making it extremely easy to operate. · · · · · WARRANTY
Steffes Corporation proudly offers product warranties. The entire heating unit is covered by a five-year limited parts warranty. All Steffes accessory and external control devices interfaced to the unit are backed by a one-year limited warranty. SPECIFICATIONS for standard 240V units with standard blower
208V, 277V, and 347V configurations also available. Contact factory for technical specifications. 1kW = 3412 BTU/hr 1kWh = 3412 BTU US Pat #5086493 · Canada Pat #2059158 MODEL
Charging Input Element Current Draw Circuits Required Elements Blowers/Control 14.0 kW 59 amps 2-40 amps 3120
17.5 kW 73 amps 2-50 amps 21.6 kW 90 amps 2-60 amps 4120
19.2 kW 80 amps 3-40 amps 24.8 kW 104 amps 3-50 amps 4130
28.8 kW 120 amps 4-40 amps 37.2 kW 155 amps 4-50 amps 4140
38.4 kW 160 amps 45.6 kW 190 amps 4-50 amps 4-60 amps 1-15 amp (6 amps maximum load) 1-15 amp (7 amps maximum load) Unit is factory-configured with multiple-line voltage, single-phase circuit connections. If single feed to the element and blowers/controls circuits is desired, an optional single-feed kit is available. Phase-balancing is recommended when making connections in 3-phase applications. 86 kWh (293,432 BTU) 125 kWh (426,500 BTU) 180 kWh (614,160 BTU) 240 kWh (818,880 BTU) The size and heating ability of the system required for an application is dependent on the heat loss of the area and the power company's off-peak hours. Refer to the Maximum Maintainable Heat Loss for heating abilities in specific charge strategies. Storage Capacity Approximate Installed Weight 1,562 lbs 2,183 lbs 3,031 lbs 3,859 lbs Contact a building contractor or architect if you have structural weight concerns of the installation surface selected. Adhere to all national and local electrical and building code placement requirements for electric heating appliances. Unit Dimensions - W x D x H w/o Ducting w/ Factory-Built Ducting (1/3 HP or 1/2 HP) w/ Factory-Built Ducting (3/4 HP) Duct Openings Supply Air Outlet (1/3 HP or 1/2 HP) Supply Air Outlet (3/4 HP) Return Air Inlet Maximum Coil Dimensions (W x D x H) 10.1" x 16" N/A 21.4" x 21.4" (in factory-built plenum) 18" x 22.6" (in factory-built plenum) 22.5" x 22.6" (in factory-built plenum) 10.5" x 22.3" (in unit) or 21.4" x 21.4" (if using a factory-built plenum) 21" x 21" x 24.25" The factory-built return air plenum is configured for housing an indoor coil. Dimensions listed are that of the inner coil area in this plenum. For larger coils, field provisions to the plenum are necessary or it will need to be supplied by the installer. LOW 1205 N/A LOW/MED 1580 1420 MED/HIGH 1780 1470 HIGH 1850 1560 41.6" x 27" x 60" 63" x 27" x 60" 29.2" x 44.7" x 46.6" 72.8" x 44.7" x 46.6" 29.2" x 44.7" x 57.6" 72.8" x 44.7" x 57.6" 29.2" x 44.7" x 68.6" 72.8" x 44.7" x 68.6" N/A 77.3" x 44.7" x 46.6" 77.3" x 44.7" x 57.6" 77.3" x 44.7" x 68.6" There are required installation clearances to account for. Contact the factory for this information. Supply Air Delivery (1/2 HP, PSC Motor) CFM @ .25 Static Pressure CFM @ .50 Static Pressure For applications requiring higher or lower air volumes, other blower options available. For specifications on the variable speed ECM blower option, contact the factory. Heating Ability Based on Charge Time (BTU/hr) 8 Consecutive Charge Hours 12 Consecutive Charge Hours 6/4/6/8 Charge Strategy 20,414 30,621 30,621 23,512 31,350 38,276 23,512 31,350 47,097 27,996 41,994 41,994 34,175 45,566 54,242 41,994 62,991 62,991 49,212 65,615 81,363 55,992 83,988 83,988 65,615 87,487 99,735 The size and heating ability of the system required for an application is dependent on the heat loss of the area and the power company's off-peak hours. If the unit is not installed within the heated area, heat lost statically must be taken into account. Contact your local power company, a contractor, or Steffes Corporation for assistance in selecting an appropriately sized system for your specific charge strategy. The 6/4/6/8 strategy listed is 8 hours off-peak at night plus 4 hours off-peak mid-day. (The Heating Ability figures listed have a heat use allowance factored in for sizing purposes. Average BTU delivery rate is the listed value multiplied by .78 heat use factor.) 3050 Highway 22 N
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ISO 9001 COMPLIANT · Dickinson, ND 58601-9413
· · phone: 701-483-5400 E-mail: offpeak@steffes.com fax: 701-456-7497 Website: www.steffes.com Manufacturer reserves the right to discontinue or change at any time, specifications or designs, without notice or incurring obligations.