lpadding=0 cellspacing=0 width=100%>
Yahoo! is not affiliated with the authors of this page or responsible for its content.
Venting Manual Venting Manual
for
Munchkin Oil Fired Boilers
Designed and Tested to the A.S.M.E. Boiler and Pressure Vessel Code
LP-115 REV 6/1/03
CONTENTS / USING THIS MANUAL
1
TABLE OF CONTENTS
PART I. COMBUSTION AIR AND VENTILATION
2
A. Fresh Air Intake . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .2
B. Air for Combustion . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .2
C. Combustion Air Supply with No Barometric Damper . . . . . . . . . . . . . . . . . . . . . . . . .3
PART II. VENTING REQUIREMENTS
3
A. Neutral Point Pressure Adjuster . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .3
B. Roof Clearances . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .4
C. Heat Extractors . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .4
PART III. NATURAL DRAFT APPLICATIONS
4
PART IV. MECHANICAL DRAFT APPLICATIONS
5
PART V. POWER VENTER APPLICATIONS
6
PART VI. DIRECT VENT APPLICATIONS
7
A. Installing The Joint Assembly . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .7
B. Installing The Outside Terminal . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .8
C. Connections To Outside Terminal . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .9
D. Connections To Appliance . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .9
PART VII. MAINTENANCE
10
PART VIII. CERAFLEX FLEX L COMPONENTS LIST
11
DANGER
Indicates a condition or hazard which
will cause severe personal injury, death
or major property damage.
SPECIAL ATTENTION BOXES
Throughout this manual you will see these
special attention boxes similar to this one,
which are intended to supplement the
instructions and make special notice of
potential hazards. These categories mean, in
the judgement of Heat Transfer Products, Inc.:
WARNING
Indicates a condition or hazard which
may cause severe personal injury,
death or major property damage.
CAUTION
Indicates a condition or hazard which
will or can cause minor personal injury
or property damage.
USING THIS MANUAL COMBUSTION AIR AND VENTILATION
2
The purpose of this manual is to guide an installer through the installation of a MUNCHKIN
OFB boiler for use in any venting application considered as 'good industry practice' and
must conform with all Federal, State and local codes requirements and further follow the
guidelines called out in NFPA31 and NFPA211.
PART I. COMBUSTION AIR AND VENTILATION
If a MUNCHKIN OFB is being used for a retrofit and is installed in a full basement with ade-
quate infiltration for combustion air it may be installed in the usual way following accepted
industry guidelines and good industry practices.
A. FRESH AIR INTAKE
Recent energy conservation practices have resulted in many people insulating and caulking
their homes to a level where the fresh air required for efficient combustion is not always
readily available. Particularly if you choose to isolate your MUNCHKIN OFB in an enclosed
area of your home, a fresh air intake must be installed in this area.
B. AIR FOR COMBUSTION
The MUNCHKIN OFB boiler must have an assured supply of combustion air. A dedicated
outside supply of air through an installed duct or pipe should be installed at or within 5 ft.
of the boiler. A shut-off damper may automatically control the supply duct when the unit is
not operating, but the operating automatic damper must 'fail' in the open position. The com-
bustion air duct must have direct access to the outdoors and have a rain hood and insect
screen installed at the outside wall.
Care should be taken when the boiler is to be installed within a home where the operation
of exhaust fans, attic fans, kitchen ventilation systems, new high efficiency clothes dryers or
fireplaces may create severe negative vent pressures and unsatisfactory combustion and
venting conditions. Special provisions should be made for additional make-up air to supply
the other air requirements.
In cases of electric heat conversions or any structure of tight construction an opening of one
(1) square inch of minimum free area per 1000 BTU per hour of burner input must be pro-
vided. The air supply to the burner must be provided directly to the burner and originate
outside the structure within five feet (5') of the burner. The inlet vent must originate on the
same wall surface as the boiler outlet vent, if a direct venting system is used. The inlet hood
should be waterproof and include a bug and bird screen.
In cases where the boiler is installed in an area where exhaust, kitchen or bath ventilation
systems and fans exist, they may create unsatisfactory combustion or venting conditions.
Special consideration should be made for additional air.
All combustion air and ventilation requirements should meet local code and or NFPA
Standard 31 and NFPA 211. VENTING REQUIREMENTS
3
C. COMBUSTION AIR SUPPLY WITH NO BAROMETRIC DAMPER
When no Barometric Damper is used Table 1 should be used to size the air inlet pipe to the
burner air housing if using a direct vent application.
Table 1
NFPA or OEM Burner specifications should take precedence where required.
PART II. VENTING REQUIREMENTS
Oil fired appliances shall be connected to flues or vents having sufficient draft at all times to
ensure safe and proper operation of the appliance.
When venting the MUNCHKIN OFB boilers, all installations should conform to all national,
local and state codes and authorities having jurisdiction.
When no local code is in effect NFPA-31 should be used as a reference, and baseline docu-
ment.
In addition, the design of chimney connectors, chimneys, power-venting systems and direct
vent systems should also conform to local and State codes, and good industry practice. In
lieu of local codes, NFPA-211 should be used as a reference.
BAROMETRIC DAMPER
The MUNCHKIN OFB boiler does not normally require a barometric damper, but, it may be
required when the draft in the venting system is stronger than required, and the burner is
incapable of operating against a high negative over-fire pressure.
Figure 1 NEUTRAL PRESSURE POINT ADJUSTER
A. NEUTRAL POINT PRESSURE ADJUSTER
In some cases the chimney may produce a draft that is too excessive and beyond the con-
trol of a draft regulator. The burner in use should be a high static or air-box type. Also, if you
have a mechanical draft device at or near the outlet, you may get flame detachment, smoky
fires, and puffbacks.
Firing Rate Range (gph) Chimney Connector Size
0.75 to 1.00
5 round or equivalent
1.00 to 1.50
6 round or equivalent
1.50 to 2.25
7 round or equivalent 4
The best way to correct this is to insure that you do not have more than -.02" of negative
water column draft at the breeching or outlet of the unit.
If you have an excess draft situation, the installation of a "neutral pressure point adjuster",
(see Figure 1, page 3) will be required.
The adjuster is a device that will reduce excessive draft and draft regulator flow. It is espe-
cially helpful with powered draft devices and excessive chimney draft situations. Both situ-
ations can cause flame problems, condensation and chimney connector damage.
Start by cutting a piece of sheet metal as shown in Figure 1, page 3, to form the
adjuster.
In detail 'A', page 3, start by making a cut about 1/3 diameter through the fluepipe.
Insert the adjuster into the fluepipe, start the burner and set breeching draft for -.02"
W.C.
When adjustment is complete, scribe adjuster with line around pipe, 'B'.
Make a second line about 1" above pipe radius line.
Trim off the excess stock as shown in 'C' and then slit the stock between the lines ver-
tically. Bend the segments in alternate directions.
Replace the adjuster, start the burner and verify settings taken earlier.
If unchanged, bend tabs against fluepipe, drawing 'D', and anchor in place with sheet
metal screws. Seal any joints with high temp silicone and the adjuster is completed.
The adjuster will reduce the velocity and strength of the draft currents and allow you to
make a permanent and safe adjuster that cannot be adjusted again.
NOTE: Before locking the adjuster in its final position, make sure that the final firing rate
has been set and that all draft settings have been made and are final.
B. ROOF CLEARANCES
Standard roof clearances apply. It is the responsibility of the installer to ensure they are ade-
quate.
C. HEAT EXTRACTORS
The MUNCHKIN OFB oil fired boiler is not approved for use with a heat extractor mounted
in the breeching or fluepipe.
PART III. NATURAL DRAFT APPLICATIONS
CAUTION
After placing the boiler within close proximity to the venting system, the
following basic guidelines should be observed that will prevent the
following conditions from occurring:
COMBUSTION AIR AND VENTILATION MECHANICAL DRAFT APPLICATIONS
5
Condensation of flue gasses.
Positive out