Williamson TMP-105 Spezifikationen PDF herunterladen (Seite 19)

TMP Oil Furnaces – Furnace Manual

670-000-004/1010 19

9 Troubleshooting

Check 120 volt supply to furnace. If there is no supply To successfully service the oil furnace, you must

voltage, check fuses and service switch. CAUTION : have these instruments :

When testing electrical equipment, always follow smoke tester

standard electrical safety procedures.

carbon-dioxide (CO

) or oxygen (O

) analyzer

draft gauge (scale should read from -.01” w.c. to -.25” w.c.)

volt/OHM/milliamper multimeter

pressure gauge capable of reading 0-150 lb/sq. inch (for oil only)

Be familiar with these instruments as well as the burner

manufacturers recommended settings.

Before beginning these troubleshooting procedures, ALWAYS :

Make sure thermostat is calling for burner operation.

Check oil supply and make sure all valves are open.

Symptom – Burner

Check fuses and make sure service switch

is on.

Check for voltage from primary relay to

burner motor. Make sure the primary relay

has not locked out on safety.

Check for line voltage into furnace junction

box.

Make sure the thermostat is calling for heat and

th at the wiring to the the rmostat is correct and t ight.

If the primary relay control is not popping

out the reset button, measure the

milliamperage at the thermostat and set the

heat-anticipator accordingly. Also check

wiring from the thermostat to the burner.

Check the alignment of the cad cell to

assure it is aimed at the fire.

Check nozzle and electrode position. Check ignition transformer output

(Reference burner manufacturers

instructions).

Check tube insertion and alignment. Check nozzle and electrode position

(Reference burner manufacturers

instructions).

Replace nozzle. Check pump pressure (varies with

manufacturer and application; see burne

manual).

Check overfire draft.

1. Remove CAD cell leadwires from the f-f

terminals on the primary safety control, then

start burner. Shortly after burner starts,

place a temporary jumper between

terminals f-f. Connect ohmeter across CAD

cell leadwires-resistance should be under

1,600 ohms.

3. With burner off, check dark cell resistance

across CAD cell leadwires. Resistance

should be greater than 20,000 ohms. If cell

resistances are different from above,

recheck wiring and location of cell, etc. If

necessary, replace plug-in portion of cell.

2. Stop burner and remove temporary jumper.

Possible corrections :

To check CAD cell operation, use the

following procedure :

Burner motor does not start.

Unable to achieve clean combustion

by setting air adjustments.

Burner short cycles or locks out on

prim ary re lay safety.

Symptom – Furnace blower

Check for 120V to the blower motor. If

present, replace motor.

Check wiring from Fan and Limit control. See

if blower motor will run when it is switched on

manually at the thermostat sub-base (if sub-

base is installed).

Blower short cycles on limit control.

Return ducts may be undersized.

Possible corrections :

Adjust fan "off" setting at 90

and adjust fan

"on" setting setting at 130

Furnace blower will not start.

Blower cycles on and off after the

burner has shut down.

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