Remington HH-70T-KFA Service Manual download pdf (Page 14)

—14—

Phone: 800-362-6951 • Fax: 800-255-7985

www.phpdistribution.com

Oil Heater Service Info.

DESA Service Information

350,000 & 600,000 BTU Heaters made by Desa

Master, Reddy, Dayton, Koehring, Knipco, & Others

Troubleshooting - Problem Solving

Observed Problem

Motor starts, but heater will not ignite

Possible Cause

If No Spark Observed at Spark Plug

A. Spark plug has incorrect gap

B. Defective transformer or transformer not

grounded properly.

C. Cracked spark plug

Possible Cause

If Spark Observed at Spark Plug

D. Incorrect fuel pump pressure

E. Defective fuel solenoid valve

F. Fuel line leak on suction side of pump

G. Dirty or damaged nozzle

H. Dirty fuel filter

Test Procedures

A. Spark Plug has incorrect gap

1. Unplug heater.

2. Remove upper shell of heater

3. Remove spark plug from burner head

4. Check gap between spark plug electrodes

with feeler gage. Correct gap for spark

plug is .05/.06 inch. Reset gap if needed.

5. Follow steps in procedure “B” to test for

spark at spark plug electrodes.

B. Defective transformer

1. Unplug heater.

2. Remove upper shell of heater.

3. Remove spark plug from burner head.

Make sure spark plug is properly gapped

(see test procedure “A” for spark plug gap)

4. Check to make sure the transformer is

properly grounded by the 2 mounting

screws. Look for loose fasteners,

corrosion, broken tabs, etc.

5. Connect the transformer secondary lead to

the spark plug.

6. Establish a good ground between the

spark plug body and heater. To do this,

attach a grounding wire to heater shell.

Clip grounding wire to grounding (outer)

electrode on spark plug. Use insulated

pliers to hold spark plug at spark plug

hex. Note: Only use pliers with plastic or

rubber sleeved handles.

7. Connect heater to electrical supply

8. Look for spark between electrodes. If the

ground is good and there is no spark

between electrodes, the transformer is

defective.

Note: No spark between electrodes may be caused by

cracked porcelain on spark plug. Before replacing

transformer, see test procedure “C”. If porcelain on spark

plug is not cracked, proceed with replacing defective

transformer.

C. Cracked spark plug

Follow steps under DEFECTIVE TRANSFORMER

procedure, to test for spark at spark plug electrodes. If

spark is seen at any place on the spark plug other than

the electrodes, the porcelain insulator is cracked. Replace

spark plug.

D. Defective fuel solenoid valve

1. Remove upper shell of heater

2. Check for fuel flow to nozzle. Do this by

turning thermostat knob to warmest

position and connecting heater to

electrical supply. With motor running,

look through air openings on rear of

combustion chamber. See if nozzle is

spraying out fuel. If nozzle is spraying out

fuel, solenoid valve is working properly. If

nozzle is not spraying out fuel, unplug

heater and follow steps below to determine

if solenoid valve is defective.

3. Disconnect yellow and white wires from

solenoid valve.

4. Set ohmmeter on the 250VAC position.

5. Connect ohmmeter test leads to yellow

and white wires that were connected to

solenoid valve.

6. Connect heater to electrical supply. If

120VAC is being sent to solenoid valve and

fuel pump pressure is correct, the

solenoid valve is defective. Replace

defective solenoid valve.

E. Fuel line leak on suction side of pump

Check all fuel lines on the suction side of the pump for

tightness. An air leak in one of these fittings can allow

air to enter the system. This will result in improper

pump pressure.

1 2 ... 9 10 11 12 13 14 15 16 17 18 19 ... 267 268

Comments to this Manuals

No comments

Remington HH-70T-KFA Service Manual Page 14

Comments to this Manuals