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Maintenance
WARNING
Hazardous Service Procedures!
The maintenance and troubleshooting procedures
recommended in this section of the manual could
result in exposure to electrical, mechanical or other
potential safety hazards. Always refer to the safety
warnings provided throughout this manual concerning
these procedures. When possible, disconnect all
electrical power including remote disconnect and
discharge all energy storing devices such as capacitors
before servicing. Follow proper lockout/tagout
procedures to ensure the power can not be
inadvertently energized. When necessary to work with
live electrical components, have a qualified licensed
electrician or other individual who has been trained in
handling live electrical components perform these
tasks. Failure to follow all of the recommended safety
warnings provided, could result in death or serious
injury.
Periodic Service
All Maintenance/Service information should be recorded
accordingly on the inspection sheet provided in this
manual (see
"Gas Equipment Start-Up, " p.
Note: The heater and vent system should be checked
once a year by a qualified technician.
WARNING
Hazardous Voltage and Gas!
Turn off the gas supply and disconnect all electric
power, including remote disconnects before servicing
unit. Follow proper lockout/tagout procedures to
ensure the power can not be inadvertently energized
and the gas can not be inadvertently turned on. Failure
to turn off gas or disconnect power before servicing
could result in death or serious injury.
Important: Gas tightness of the safety shut-off valves
must be checked on at least an annual basis.
WARNING
Hazard of Explosion!
Never use an open flame to detect gas leaks. Explosive
conditions may occur. Use a leak test solution or other
approved methods for leak testing. Failure to follow
recommended safe leak test procedures could result in
death or serious injury or equipment or property-only-
damage.
To check gas tightness of the safety shut-off valves, turn off
the manual valve upstream of the appliance combination
control. Remove the 1/8-inch pipe plug on the inlet side of
the combination control and connect a manometer to that
tapping. Turn the manual valve on to apply pressure to the
combination control. Note the pressure reading on the
GMND-SVX01B-EN
manometer, then turn the valve off. A loss of pressure
indicates a leak. If a leak is detected, use a soap solution to
check all threaded connections. If no leak is found,
combination control is faulty and must be replaced before
putting appliance back in service.
Should maintenance be required, perform the following
inspection and service routine:
1. Inspect the area near the unit to be sure that there is no
combustible material located within the minimum
clearance requirements listed in this manual (see
Table 3, p.
Combustible Materials!
Maintain proper clearance between the unit heat
exchanger, vent surfaces and combustible materials.
Refer to unit nameplate and installation instructions for
proper clearances. Improper clearances could result in a
fire hazard. Failure to maintain proper clearances could
result in death or serious injury or property damage.
2. Turn off the manual gas valve and electrical power to
the gas duct furnace.
30).
3. To clean or replace the main burners, remove the
bottom panel and compress the spring by moving the
burner toward the manifold. Slide the opposite end of
the burner downward from the locating slot while
retaining spring is still compressed. Pull the burners
away from the heater.
4. With the burners removed, wire brush the inside
surfaces of the heat exchanger.
5. Remove any dirt, dust, or other foreign matter from the
burners using a wire brush and/or compressed air.
Ensure that all parts are unobstructed. Inspect and
clean pilot burner if necessary.
6. Reassemble the gas duct furnace by replacing all parts
in reverse order.
7. Complete the appropriate unit start-up procedure as
given in
plate and the unit nameplate).
8. Check the burner adjustment (see
Adjustment, " p.
9. Check all gas control valves and pipe connections for
leaks.
10. Check the operation of the automatic gas valve by
lowering the setting of the thermostat, stopping the
operation of the gas duct furnace. The gas valve should
close tightly, completely extinguishing the flame on
the main burners.
11. Inspect and service the blower section of the system.
Check and test the operational functions of all safety
devices supplied with your unit.
12).
WARNING
"Operation, " p. 26
(see unit lighting instruction
"Primary Air Shutter
28).
31
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