Heating System Service Checks - Haier GE NF80XV Series Service Manual

GAS VALVE
MANIFOLD PRESSURE ADJUSTMENT
(TURN CCW TO INCREASE PRESSURE)
NEGATIVE AIR
PRESSURE PORT
INLET
SUPPLY
PRESSURE
TAP
GAS VALVE SHOWN IN THE ON POSITION
Figure 16.
8. Move switch on gas valve to ON. Do not force. See
Figure 16.
9. Replace the access panel.
10. Turn on all electrical power to to the unit.
11. Set the thermostat to desired setting.
NOTE: When unit is initially started, steps 1 through 11
may need to be repeated to purge air from gas line.
Turning Off Gas to Unit
1. Set thermostat to lowest setting.
2. Turn off all electrical power to unit if service is to be
performed.
3. Remove access panel.
4. Move switch on valve to OFF. Do not force.
5. Replace 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 circuit 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 lock out? If the unit locks
out again, call the service technician to inspect the unit
for blockages.
POSITIVE AIR
PRESSURE PORT
OUTLET
MANIFOLD
PRESSURE TAP
Page 28
10. Is pressure switch closed? Obstructed flue will cause
unit to shut off at pressure switch. Check flue and
outlet for blockages.
11. Are flame rollout switches tripped? If flame rollout
switches are tripped, call the service technician for
inspection.
Safety or Emergency Shutdown
Turn off unit power. Close manual and main gas valves.
Extended Period Shutdown
Turn off thermostat or set to "UNOCCUPIED" mode.
Close all gas valves (both internal and external to unit)
to guarantee no gas leak into combustion chamber. Turn
off power to unit. All access panels and covers must be in
place and secured.

Heating System Service Checks

CSA Certification
All units are CSA design certified without modifications.
Refer to the NF80XV 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.
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.
Testing Gas Piping
IMPORTANT
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.
31-5000734 Rev. 0