Trane Gas Unit Heaters Wartungshandbuch

44

GTND-SVX01B-EN

All Maintenance/Service information should be recorded 
accordingly on the inspection sheet provided in this 
manual (see 

).

To check gas tightness of the safety shut-off valves, turn off 
the manual valve upstream of the appliance combination 
control. Remove the plug on the inlet side of the 
combination control and connect a manometer to that 
tapping:
•

Unit sizes 30–120: The plug is 3/32-hex head.

•

Unit sizes 150–400: The plug is a 1/8-inch pipe plug.

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.

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.

2. Turn off the manual gas valve and electrical power to 

the unit heater.

3. Unit sizes 30–120: Remove service access panel.

4. To clean or replace the main burner(s):

Unit sizes 30–120: Remove retainer from around 
manifold orifice, disconnect flame sensor and 
igniter from control board, remove burner 
assembly mounting screws (see 

).

Unit sizes 150–400: Remove burner cover. Remove 
top strip from above burners. Lift burners up and 
pull away from manifold to remove.

5. With the burner(s) removed, wire brush the inside 

surfaces of the heat exchanger.

6. Remove any dirt, dust, or other foreign matter from the 

burner(s) using a wire brush and/or compressed air. 
Ensure that all parts are unobstructed.

7.

Reassemble the unit heater by replacing all parts in 
reverse order.

8. Unit sizes 150–400: Complete the appropriate unit 

start-up procedure as given in 

 of this manual (see unit lighting 

instruction plate and the unit nameplate).

9. Check the burner adjustment.

10. Check all gas control valves and pipe connections for 

leaks.

11. Check the operation of the automatic gas valve by 

lowering the setting of the thermostat, stopping the 
operation of the gas unit heater. The gas valve should