Heating System Service Checks - Haier GE APPLIANCES NF96US Service Manual

4. Move gas valve switch to OFF.
5. Replace the access panel.
Failure To Operate
If the unit fails to operate, check the following:
1. Is the thermostat calling for heat?
2. Are access panels securely in place?
3. Is the main disconnect switch closed?
4. Is there a blown fuse or tripped breaker?
5. Is the filter dirty or plugged? Dirty or plugged filters will
cause the limit control to shut the unit off.
6. Is gas turned on at the meter?
7. Is the manual main shut-off valve open?
8. Is the internal manual shut-off valve open?
9. Is the unit ignition system in lockout? If the unit locks
out again, inspect the unit for blockages.

Heating System Service Checks

C.S.A. Certification
All units are C.S.A. design certified without modifications.
Refer to the NF96US Operation and Installation Instruction.
Gas Piping
CAUTION
If a flexible gas connector is required or allowed by
the authority that has jurisdiction, black iron pipe shall
be installed at the gas valve and extend outside the
furnace cabinet. The flexible connector can then be
added between the black iron pipe and the gas supply
line.
WARNING
Do not over torque (800 in-lbs) or under torque (350
in-lbs) when attaching the gas piping to the gas valve.
Gas supply piping should not allow more than 0.5" W.C.
drop in pressure between gas meter and unit. Supply gas
pipe must not be smaller than unit gas connection.
Compounds used on gas piping threaded joints should be
resistant to action of liquefied petroleum gases.
31-5000728 Rev. 0
Testing Gas Piping
In case emergency shutdown is required, turn off the
main shut-off valve and disconnect the main power to
unit. These controls should be properly labeled by the
installer.
When pressure testing gas lines, the gas valve must be
disconnected and isolated. Gas valves can be damaged if
subjected to more than 0.5 psig (14" W.C.). See Figure 56.
MANUAL MAIN SHUT-OFF
VALVE WILL NOT HOLD
NORMAL TEST PRESSURE
1/8" N.P.T. PLUGGED TAP
When checking piping connections for gas leaks, use
preferred means. Kitchen detergents can cause harmful
corrosion on various metals used in gas piping. Use of a
specialty Gas Leak Detector is strongly recommended.
Do not use matches, candles, flame or any other source
of ignition to check for gas leaks.
Testing Gas Supply Pressure
Gas Flow (Approximate)
Capacity
-045
-070
-090
-110
Natural-1000 btu/cu ft LP-2500 btu/cu ft
Page 47
IMPORTANT
CAP
Figure 56.
WARNING
Gas Meter Clocking Chart
Seconds for One Revolution
Natural
1 cu ft 2 cu ft 1 cu ft
Dial Dial Dial
80 160 200
55 110 136
41 82 102
33 66 82
Table 13.
FURNACE
ISOLATE
GAS VALVE
LP
2 cu ft
Dial
400
272
204
164