Maintenance - Trane GRAA Installation Operation & Maintenance

Final Checkout
Run the unit sequentially through its stages of heat-
ing and cooling. Once proper unit operation is veri-
fied, perform these final steps:
1. Inspect unit for debris and/or misplaced tools
and hardware.
2. Be sure all gas valves and controls are in the
operating position if the unit will be operating
immediately.
3. Cycle unit on all safety controls to verify proper
unit operation.
4. Confirm proper operating control (thermostat or
ductstat) operation by cycling unit.
5. Secure all exterior panels in place.
VI . MAINTENANCE
nace; swing downward the piping to clear drawer.
3. Disconnect duct furnace gas valve wiring taking
note of all wire locations. Disconnect ignitor and
flame sensing probe wires at ignition control
module and any other wires.
4. Remove the locking screws holding the burner-
drawer assembly in position.
5. Slide the burner drawer out of the duct furnace.
6. Removal of burners is accomplished by sliding
burner towards manifold, compressing locating
spring, until the rear of the burner clears slot in
back of burner drawer.
7. With burner drawer removed from duct furnace,
inspect the inside surfaces of the heat exchang-
er. Wire brush if necessary.
8. Remove any dirt, dust or other foreign matter
from the burners using a wire brush and/or com-
pressed air. Insure all parts of the burner are
unobstructed. Inspect and clean pilot burner if
necessary.
9. Reassemble the duct furnace by replacing all
parts in order.
10. Light unit per the unit lighting instructions.
These units have been developed for outdoor instal-
lation. Maintenance is required and it is suggested
that the following unit servicing and inspections be
performed routinely. Also read in entirety and refer to
the Outdoor Duct Furnace Manual for maintenance
requirements.
Inspect area near unit to be sure that there is no
combustible material located within the minimum
clearance requirements (See Figure 2). Service pan-
els provide easy access to the gas controls (located
in duct furnace section), the blower compartment,
the electrical cabinet and the supply plenum. To
remove the service door from any of these compart-
ments, refer to access panel removal section in
beginning of this manual.
The pilot burner can be serviced by removing the
pilot plate from the main burner drawer assembly.
To remove the main burner drawer assembly (also
refer to Outdoor Rooftop Duct Furnace Installation
and Service Manual) for servicing the burners, pro-
ceed as follows:
1. Shut off the gas supply at the gas shutoff valve
and electrical power to the unit.
2. Break the union upstream of duct furnace gas
valve and loosen the union external to the fur-
11. Check the burner adjustment. See the "Primary
Air Adjustment' section of this manual.
12. Check all gas control valves and pipe connec-
tions for leaks.
13.Check the operation of the duct furnace gas
valve by lowering the setting of the thermostat,
stopping the operation of the duct furnace. The
duct furnace gas valve should close, extinguish-
ing the pilot and main burner flames.
14. Inspect and service the blower section of the
system.
The unit should be thoroughly checked before the start
and at the end of each heating and cooling season.
1. Motors and belts should be inspected.
2. Tighten belts if loose.
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