Trane GRAA - Maintenance Overview and Safety; General Maintenance Information; Service Safety Warnings; Main Burner Drawer Removal

MUA-SVX003B-EN
37
Maintenance
General Information
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ttrraaiinneedd iinn hhaannddlliinngg lliivvee eelleeccttrriiccaall ccoommppoonneennttss ppeerrffoorrmm tthheessee ttaasskkss..
WWAARRNNIINNGG
EExxpplloossiioonn HHaazzaarrdd!!
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NNeevveerr uussee aann ooppeenn ffllaammee ttoo ddeetteecctt ggaass lleeaakkss.. UUssee aa lleeaakk tteesstt ssoolluuttiioonn ffoorr lleeaakk tteessttiinngg..
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 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.
NNoottee:: Gas tightness of the safety shutoff valves must be checked on at least an annual basis.
These units have been developed for outdoor installation. 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, p. 11). Service panels 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 compartments, 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.
MMaaiinn BBuurrnneerr DDrraawweerr AAsssseemmbbllyy RReemmoovvaall (Also refer to Outdoor Rooftop Duct Furnace manual).
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
furnace; 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
exchanger. Wire brush if necessary.