International comfort products NAHB00101MH, Installation Instructions Manual

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Specifications subject to change without notice.
6. Remove cap that conceals adjustment screw for gas
valve regulator. (See Figure 23 )
7. Turn adjusting screw using supplied ADJUSTING KEY
either counterclockwise (out) to decrease input rate or
clockwise (in) to increase rate. (See Figure 21 )
8. Replace cap and check rate. Cap MUST be in place to
actuate regulator.
9. Repeat Steps 5 through 8 until correct input rate is
obtained.
Figure 21
Manifold Pressure Adjustment Key
ON/OFF SWITCH
INLET
PRESSURE TAP
REGULATOR PLUNGER
ADJUSTING KEY
GAS PRESSURE
REGULATOR
MANIFOLD
PRESSURE TAP
BURNER REFERENCE
PRESSURE TAP
A11509
NOTE : Gas valve LP/NAT cap MUST be in place with LP
arrow pointing toward gas valve when checking input rate.
When correct input is obtained, main burner flame should be
clear blue, almost transparent (See
Figure 22 ). Be sure cap is
in place when finished.
Figure 22
Burner Flame
Burner Flame
Burner
Manifold
A11461
When correct input is obtained, make sure cap that conceals
gas valve regulator adjustment screw is oriented properly for
propane (LP) gas. The LP arrow should be pointing toward gas
valve. (See Figure 21 )
10. Remove jumper across R and W thermostat connections
to terminate call for heat.
11. Turn furnace gas valve control knob or switch to OFF
position.
12. Turn gas supply manual shutoff valve to OFF position.
13. Turn off furnace power supply.
14. Remove manometer and replace manifold pressure tab
plug. (See Figure 21 )
15. Turn furnace gas valve switch to ON position.
16. Turn on furnace power supply.
17. Set room thermostat to call for heat.
!
WARNING
FIRE OR EXPLOSION HAZARD
Failure to follow this warning could result in personal injury
and/or death.
NEVER test for gas leaks with an open flame. Use a
commercially available soap solution made specifically for
the detection of leaks to check all connections. A fire or
explosion may result causing property damage, personal
injury or loss of life.
!
AVERTISSEMENT
RISQUE D’EXPLOSION ET D’INCENDIE
Le fait de ne pas suivre cet avertissement pourrait entraîner
des dommages corporels et / ou la mort.
Ne jamais examiner pour les fuites de gaz avec une flamme
vive. Utilisez plutôt un savon fait specifiquement pour la
détection des fuites de gaz pour verifier tous les connections.
Un incendie ou une explosion peut entrainer des dommages
matériels, des blessures ou la mort.
18. Check pressure tap plug for gas leaks when main
burners ignite.
19. Check for correct burner flame.
20. Observe unit operation through two complete heating
cycles.
21. See Sequence of Operation in furnace Installation,
Start − Up, and Operating Instructions.
22. Set room thermostat to desired temperature.
23. After making the required manifold pressure
adjustments, check and adjust the furnace temperature
rise per the furnace installation instructions.
CHECK LOW GAS PRESSURE SWITCH
The newly installed low gas pressure switch is a safety device
used to guard against adverse burner operating characteristics
that can result from low gas supply pressure. Switch opens at
not less than 6.5 in. w.c. and closes at not greater than 10.2 in.
w.c.
This switch also prevents operation when the propane tank
level is low which can result in gas with a high concentration of
impurities, additives, and residues that have settled to the
bottom of the tank. Operation under these conditions can
cause harm to the heat exchanger system. This normally open
switch closes when gas is supplied to gas valve under normal
operating pressure.
The closed switch completes control circuit. Should an
interruption or reduction in gas supply occur, the gas pressure
at switch drops below low gas pressure switch setting, and
switch opens. Any interruption in control circuit (in which low
gas pressure switch is wired) quickly closes gas valve and
stops gas flow to burners. When normal gas pressure is
restored, the system must be electrically reset to re − establish
normal heating operation.
Before leaving installation, observe unit operation through two
complete heating cycles. During this time, turn gas supply to
gas valve off just long enough to completely extinguish burner
flame, then instantly restore full gas supply. To ensure proper
low gas pressure switch operation, observe that there is no gas
supply to burners until after hot surface igniter begins glowing.
LABEL APPLICATION
1. Fill in Conversion Responsibility Label (337991 − 101)
previously applied to inside of main furnace door by
installer. Date, name, and address of organization