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PLB

Oil Furnaces

 – 

Furnace Manual

670-000-001/0204  

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

2

) or oxygen (O

2

) 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 that the wiring to the thermostat is correct.

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 burner
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 
primary relay safety.

Symptom – Furnace blower

Furnace blower will not start.

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). 

Check for 120V to the blower motor. If
present, replace motor.

Blower short cycles on limit control.

Return ducts may be undersized.

Possible corrections :

Adjust fan "off" setting at 90

o

and adjust fan

"on" setting at 110

o

.

Blower cycles on and off after the 
burner has shut down.

Summary of Contents for PLB210 Low Boy

Page 1: ...s furnace or any other appliance Ventilate house while operating furnace for the first time Odors may be emitted for a brief period Do not alter this furnace in any way The manufacturer will not be li...

Page 2: ...e a mixture of gasoline and oil waste fuel refuse or any other substance in the burner of furnace Installation Do not block flow of combustion or ventilation air to furnace Do not block or obstruct th...

Page 3: ...arances Provide no less than the minimum clearances given in Table 1 to ensure the furnace can be properly operated serviced and maintained Always apply whichever clearance is LARGER combustible const...

Page 4: ...filtration from outside Each opening should be at least 140 sq in per 1 GPH input 1 sq in per 1000 BTU input of all fuel burning appliances plus requirements for any equipment that can pull air from r...

Page 5: ...to avoid Spray cans containing chloro fluorocarbons Permanent wave solutions Chlorinated waxes cleaners Chlorine based swimming pool chemicals Calcium chloride used for thawing Sodium chloride used fo...

Page 6: ...Provide ventilated thimble per all applicable codes where vent pipe passes through wall or ceiling Failure to comply could result in severe personal injury death or substantial property damage Duct l...

Page 7: ...urnace installed with a 4 ton air conditioning evaporator coil Heating mode air flow is still 1 050 cfm Cooling mode air flow use Equation 3 4 CFM 4 x 400 1 600 cfm x The larger number is 1 600 cfm co...

Page 8: ...8 7 7 6 6 900 14 58 41 31 25 21 19 17 14 12 11 10 9 8 8 7 7 7 1000 16 64 45 34 28 23 20 18 15 13 11 10 9 9 8 8 7 7 1100 16 72 49 38 30 25 22 19 16 14 12 11 10 9 9 8 8 7 1200 16 54 41 33 27 24 21 17 15...

Page 9: ...12 600 12 59 38 28 22 19 16 15 13 700 12 69 44 32 25 21 18 16 15 13 800 14 50 36 29 24 20 18 16 14 900 14 56 41 32 26 22 20 18 15 1000 16 63 45 35 29 24 22 19 17 15 1100 16 69 49 38 31 26 23 21 18 16...

Page 10: ...injury or death The horizontal vent must slope upwards away from the furnace a minimum of inch per foot Connection must be made above bottom of chimney to avoid blockage Vent pipe must not enter chim...

Page 11: ...Teflon tape as an oil pipe sealant It can cause valves to fail creating hazards Use only flare fittings Do not use compression fittings Failure to comply could result in severe personal injury death o...

Page 12: ...PLB Oil Furnaces Furnace Manual 12 670 000 001 0204 Notes...

Page 13: ...rm to x National Electrical Code ANSI NFPA 70 latest edition and any additional national state or local codes x In Canada CSA C22 1 Canadian Electrical Code Part One and any local codes x Wiring must...

Page 14: ...PLB Oil Furnaces Furnace Manual 14 670 000 001 0204 6 Wire furnace burner continued Figure 1 Wiring PLB furnace with direct drive blower DNS 0913 Rev A...

Page 15: ...PLB Oil Furnaces Furnace Manual 670 000 001 0204 15 6 Wire furnace burner continued Figure 2 Wiring PLB furnaces with direct drive blower DNS 0914 Rev B...

Page 16: ...PLB Oil Furnaces Furnace Manual 16 670 000 001 0204 6 Wire furnace burner continued Figure 3 Wiring PLB furnaces with direct drive blower DNS 0873 Rev B...

Page 17: ...ber CO2 between 10 and 11 with 0 smoke To start furnace continued Make final burner adjustments using combustion test equipment to assure proper operation 8 Check furnace and duct system for proper op...

Page 18: ...ossible flue gas leakage and carbon monoxide emissions leading to severe personal injury or death 24 Limit control tested per To start up in this manual 25 Furnace cycled with thermostat Raise to high...

Page 19: ...ozzle and electrode position Check ignition transformer output Reference burner manufacturers instructions Check tube insertion and alignment Check nozzle and electrode position Reference burner manuf...

Page 20: ...G WARNING Consult with homeowner to see if there were any Check sequence of operation problems with furnace or system during the prior Check flame characteristics heating season or cooling season Perf...

Page 21: ...x Do not attempt to start burner when excess oil has accumulated when unit is full or vapor or when combustion chamber is very hot x Do not start burner unless collector box vent and burner mounting d...

Page 22: ...PLB Oil Furnaces Furnace Manual 22 670 000 001 0204 11 Components and replacement parts Figure 4 Model PLB 210 furnaces Component locations DNS 0879 Rev B...

Page 23: ...t 12 Front panel insulation B02756 3 4 HP direct drive motor 13 Gasket observation door B01014 w ith motor support 14 Channel w ire B01763 Blow er GT12 10 15 Floor B01769 01 item 35B housing included...

Page 24: ...0 WC 168 000 138 000 1 20 82 6 GT12 10 3 4 Med High High 5 1950 1900 189 000 155 000 1 35 82 8 GT12 10 3 4 High High 5 2050 1900 210 000 171 000 1 50 81 9 GT12 10 3 4 High N A 5 2050 N A PLB 210 Insta...

Page 25: ...0 210 000 1 50 1 25 70W 145 BECKETT BURNER Model AFG 3450 RPM Tube insertion 2 7 8 Input Model Firing rate USGPH Nozzle Delavan Head Low firing rate baffle Static disc PLB 210 Combustion air adjustmen...

Page 26: ...om thermostat 2 If the furnace oil burner should shut down on flame failure the burner primary control will lock out Ask your service technician to show you the correct procedure to reset the primary...

Page 27: ...PLB Oil Furnaces Furnace Manual X40101 Rev G...

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