Trane Gas Unit Heaters Installation Manual download pdf (Page 40)

Diagnostics

40 GLND-SVX01B-EN

2. Pilot adjustment screw turned too

low on combination/automatic

main gas valve.

2. Refer to “Operation,” p. 27.

3. Air in gas line. 3. Purge air from gas supply.

4. Incorrect lighting procedure. 4. Follow lighting instruction label adjacent to gas valve.

5. Dirt in pilot orifice. 5. Remove pilot orifice. Clean with compressed air or solvent.

(Do not ream.)

6. Extremely high or low gas

pressure.

6. Refer to “Operation,” p. 27.

7. Defective thermocouple (standing

pilot units only).

7. Check thermocouple connection, and replace if defective.

8. Drafts around unit. 8. Eliminate drafts. Refer to “Installation: Mechanical,” p. 11.

9. Pilot valve not opening (faulty

wiring).

9. Inspect and correct all wiring.

10. No spark (if applicable) (faulty

wiring).

10. Inspect and correct ignition system wiring. See symptoms

U, V, and W.

11. Defective gas valve. 11. Replace.

N. Power venter will not run. 1. Loose wiring. 1. Check and tighten all wiring connections per diagrams.

Thermostat wires tagged “W” and “G” must be connected

together (unless special thermostats are used; if so, see

thermostat wiring diagram, “Electrical Connections,” p. 25).

2. Defective motor overload

protector or defective motor.

2. Replace motor.

3. Defective power venter relay. 3. Check for 24V across 1 and 3 terminals on fan relay. If 24V

is present, jumper terminals numbered 2 and 4. If motor

runs, the fan relay is defective and must be replaced. If 24V

is not present, check wiring per diagrams.

O. Power venter motor turns on and

off while burner is operating.

1. Fan relay heater element

improperly wired.

1. Be sure venter relay heater terminals are connected per

diagrams.

2. Defective venter relay switch. 2. Replace venter relay.

3. Motor overload protector cycling

on and off.

3. Check motor amps against motor name plate rating, check

voltage, replace venter relay motor if defective.

4. Motor not properly oiled. 4. Refer to label on motor.

P. Power venter motor will not stop. 1. Improperly wired venter relay. 1. Check all wiring.

2. Main burners not lighting while

thermostat calls for heat.

2. Refer to H and N symptoms.

3. Defective venter relay. 3. Replace venter relay.

Q. Not enough heat. 1. Incorrect gas input. 1. Refer to “Operation,” p. 27.

2. Heater undersized. 2. This is especially true when the heated space is enlarged.

Have the heat loss calculated and compare to the heater

output (80 percent of input). Your gas supplier or installer

can furnish this information. If heater is undersized, add

additional heaters.

3. Thermostat malfunction. 3. Replace thermostat.

4. Heater cycling on limit control. 4. Check air movement through heat exchanger. Check

voltage to fan motor. Clean power venter blade and heat

exchanger and oil power venter motor.

5. Check outside dampers if used. 5. Adjust dampers accordingly.

R. Too much heat. 1. Thermostat malfunction. 1. Replace thermostat.

2. Heater runs continuously. 2. Check wiring per diagrams; check operation at valve. Look

for short (such as staples piercing thermostat wiring), and

correct; replace gas valve. Refer to “Operation,” p. 27.

S. Cold air is delivered on start up. 1. Fan relay heater element

improperly wired.

1. Be sure fan relay heater terminals are connected per

diagrams.

T. Cold air is delivered during heater

operation.

1. Incorrect manifold pressure or

input.

1. Refer to

“Operation,” p. 27.

Voltage to unit too high. 2. Check motor voltage with fan running. Should be 115 volts

AC.

3. Air throughput too high. 3. Refer to “Operation,” p. 27.

Table 9. Troubleshooting guide (continued)

Symptoms Possible Cause(s) Corrective Action

1 2 ... 35 36 37 38 39 40 41 42 43

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Trane Gas Unit Heaters Installation Manual Page 40

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