Lennox OHR23 Series Installation Instructions Manual Download

Page: 24 / 25

Page 24

Troubleshooting: Burner starts and fires, but short cycles (too little heat)

Source

Procedure

Causes

Correction

Heat anticipator set too low

Correct heat anticipator setting.

Thermostat

Check thermostat.

Vibration at thermostat

Correct source of vibration.

Thermostat

Check thermostat.

Thermostat in the path of a
warm air draft

Shield thermostat from draft or
relocate.

Dirty furnace air filters

Clean or replace filter.

Burner running too slow

Increase blower speed to main-
tain proper temp. rise.

Blower motor seized or burned
out

Replace motor.

Connect voltmeter between line

Blower bearings seized

Replace bearings and shaft.

Limit Control

voltage connections to primary
control (black & white leads). If

Blower wheel dirty

Clean blower wheel.

Limit Control

control (black & white leads). If
burner cycles due to power inter-
ruption it is cycling on limit

Blower wheel in backward

Reverse blower wheel.

ruption, it is cycling on limit.

Wrong motor rotation

Replace with properly rotating
wheel.

Restrictions in return or supply
air system

Correct cause of restriction.

Adjustable limit control set too
low

Reset limit to maximum stop
setting.

Power

If voltage fluctuates, fault is in the
power source Recheck voltage

Loose wiring connection

Locate and secure connection.

Power

power source. Recheck voltage
at the power source.

Low or fluctuating line voltage

Call power company.

Troubleshooting: Burner runs continuously (too much heat).

Source

Procedure

Causes

Correction

Shorted or welded thermostat
contacts

Repair or replace the thermo-
stat.

If burner turns

Stuck thermostat bimetal

Clear obstruction or replace
thermostat.

Thermostat

If burner turns
off, fault is in
the thermostat

Thermostat not level

Level thermostat.

Thermostat

Disconnect

the thermostat
circuit.

Shorted thermostat wires

Repair short or replace wires.

sco

ect

thermostat
wires at the pri-

circuit.

Thermostat out of calibration

Replace thermostat.

wires at the pri-
mary control.

Thermostat in cold draft

Correct draft or relocate the
thermostat.

Primary control

If burner does
not turn off,
fault is in the
primary control.

Defective primary control

Replace the defective primary
control.

Summary of Contents for OHR23 Series

Page 1: ...e or maintenance can cause injury or property damage Refer to this manual For assistance or additional information consult a qualified installer or service agency INSTALLATION INSTRUCTIONS OHR23 SERIES UNITS OIL UNITS 504 628M 38152A061 06 04 Supersedes 4 02 Table of Contents General 1 Unit Dimensions 2 OHR23 Unit Parts Arrangement 3 Oil Burner Parts Arrangement 3 Requirements 4 Installation 5 Sup...

Page 2: ... in 19 mm Inch above Floor Level RETURN AIR OPENING 3 4 19 3 4 19 3 4 19 FRONT OF FURNACE COMBUSTIBLE FLOOR SUPPLY AIR DUCT Not Furnished 140 15 4 105 120 16 1 4 413 20 1 4 514 140 154 16 1 4 413 20 1 4 514 105 120 G 59 1499 59 1499 53 1346 14 1 2 368 32 1 2 826 H 32 1 2 826 H HEAT EXCHANGER CLEAN OUT PORTS 3 HEAT EXCHANGER CLEAN OUT PORTS 3 Return Air Return Air Page 2 OHR23 Unit Dimensions Inche...

Page 3: ... RETAINING 1 4 HEX HEAD SCREW FB HEADS ASSY FOR AIR TUBE ASSY ELECTRODE HEAD NOZZLE LINE PEDESTAL ADAPTER NOZZLE AIR SCOOP INLET WHEEL BLOWER FLANGE GASKET MOTOR 4X4 BOX IGNITOR DOOR GASKET REAR ACCESS COUPLING FUEL PUMP PLATE ESCUTCHEON NUT SPLINED DOOR ASSY REAR ACCESS ASSY HOUSING MAIN SCREWS AIR TUBE FLANGE ASSY ELECTRODE 6 5 4 3 7 0 8 ELECTRONIC IGNITION TRANSFORMER PRIMARY CONTROL AIR ADJ DI...

Page 4: ...r opening shall be no more than 6 inches from the room s ceiling The combustion air opening should provide a minimum free area one half square inch per 1 000 Btu per hour input This combustion air should be brought into the area con taining the furnace below the level of the furnace burner IMPORTANT An opening to the outside for combustion air is strongly recommended especially in new homes Refer ...

Page 5: ...t when facing the front the warm discharge is to the right 2 Remove the nuts in the bracket that hold the burner to the furnace front Rotate the burner and burner mount ing plate 180 and reinstall the nuts 3 Remove the screws that hold the limit control in place Use the provided knockout hole to relocate the limit control to the top side of the front panel Installation on Non Combustible Material ...

Page 6: ...0 154 Filter Rack Installation 1 Slide filter rack over return duct flanges 2 Using a scriber through the filter rack mounting holes mark seven mounting hole locations in the return end of the cabinet See figure 4 3 Remove filter rack and drill 1 8 diameter holes at the marked positions 4 Place filter rack in position again and secure it to the cabinet using the sheet metal screws provided Clear a...

Page 7: ...sembly is attached to the vestibule panel by three nuts Slots are provided in the mounting flange for re moving the burner assembly from the vestibule By loosen ing the nuts and by turning the whole burner assembly counterclockwise figure 5 the entire burner assembly will come out of the furnace There is adequate wire to remove the burner without disconnecting wires Once removed just turn the burn...

Page 8: ...the furnace 4 Pipe should be at least 24 gauge galvanized 5 Single wall vent pipe should not run outside or through any unconditioned space 6 Chimney should extend 3 feet 0 9 m above highest point where the vent passes through the roof and 2 feet 0 6 m higher than any portion of a building within a horizontal distance of 10 feet 3 m 7 The vent must not pass through a floor or ceiling Clear ances t...

Page 9: ...ir Requirements CAUTION Insufficient combustion air can cause headaches nausea dizziness or asphyxiation It will also cause excess water in the heat exchanger resulting in rust ing and premature heat exchanger failure It can also cause property damage All oil fired appliances require air to be used for the com bustion process If sufficient amounts of combustion air are not available the furnace or...

Page 10: ...he top of the enclosure and one within 12 305 mm of the bottom These openings must communicate directly or by ducts with the outdoors or spaces crawl or attic that freely communicate with the outdoors or indirectly through vertical ducts Each opening shall have a minimum free area of 1 square inch 6 4 square centimeters per 4 000 Btu 1172 W per hour of total input rating of all equipment in the en...

Page 11: ...ss sec tional area as the free area of the openings to which they connect The minimum dimension of rectangular air ducts shall be no less than 3 76 mm In calculating free area the blocking effect of louvers grilles or screens must be considered If the design and free area of protective cover ing is not known for calculating the size opening required it may be assumed that wood louvers will have 20...

Page 12: ...ween the space in which the appliances re maining connected to the common venting system are located and other spaces of the building Turn on clothes dryers and any appliances not connected to the common venting system Turn on any exhaust fans such as range hoods and bathroom exhausts so they will operate at maximum speed Do not operate a summer exhaust fan Close fireplace dampers 4 Following the ...

Page 13: ... Use the least number of elbows and angles possible Slope flue pipe toward chimney approximately 1 4 for every foot of horizontal run Flue pipe or vent connector must be inserted into but not beyond the outside wall of the chimney flue Where two or more appliances vent into a common flue the area of the common flue should be at least equal to the area of the largest flue or vent connector plus 50 ...

Page 14: ...ts of a return line that purges the fuel pump of air by return ing it to the tank To determine the run and lift for piping refer to table 5 To determine the length of the run for piping refer to table 4 Figure 17 Oil Piping ÎÎÎÎÎ ÎÎÎÎÎ ÎÎ ÎÎÎÎÎÎÎÎÎÎ ÎÎ ÎÎ ÎÎ ÎÎ ÎÎÎ fuel pump Aux Filter Return pipe Fill Pipe Air Vent Oil Tank Inlet Return pipe H 3 4 76 mm 102 mm R outside tank fuel pump above botto...

Page 15: ...te where it should air may enter the system and prime may be lost An oil filter is required for all models Install filter inside the building between the tank shut off valve and the burner Locate filter close to burner for easy maintenance Table 6 lists the filters for the OHR23 furnace Table 6 Installation Clearances inches mm Oil Filters Cat Number 10 micron filter no mounting bracket 81P89 10 m...

Page 16: ...Page 16 Figure 18 Fan Control Board thermostat terminal strip Figure 19 Typical OHR23 Wiring Diagram ...

Page 17: ... with unit off Attach pressure gauge to pump outlet Turn unit on and check pressure and compare to table 4 Adjust if necessary B Temperature Rise To measure temperature rise place plenum thermometers in warm air and return air plenums Locate thermometer in warm air plenum where thermometer will not see the heat exchanger to prevent it from picking up radiant heat Set thermostat to its highest sett...

Page 18: ...irm that you have not increased the air too much Again you do not want a positive pressure at the test port It should still be 0 02 less than the draft pres sure reading taken at the breach You may need to in crease the stack draft by adjusting the barometric draft con trol 7 Stack Temperature Take a stack temperature reading in the vent pipe Subtract the room air temperature from the stack temper...

Page 19: ... Secure Supply Voltage Electrical Connections Tight Job Name Installer Unit Model No Job No City City Serial No Date State Serviceman Draft Reading recommended 03 04 inches w c Flue Connections Tight HEATING SECTION THERMOSTAT Calibrated Heat Anticipator Properly Set Level Blower Motor Amps Blower Motor H P Blower Motor Lubrication O K Piping Connections Tight Vent Clear State Temperature Rise Fan...

Page 20: ...nergized Circulating fan is energized at the cool speed Cooling compressor turns on immediately Thermostat ends call for cool G and Y terminals are de energized Circulating fan and cooling compressor turn off immediately Thermostat begins call for fan G terminal is energized Circulating fan is energized immediately at cool speed ST9103A may be factory configured to operate heat speed in this mode ...

Page 21: ...y control If the burner starts fault is in the Flame detector exposed to light Seal off false source of light the burner starts fault is in the detector circuit short circuit in the flame detec tor Replace detector Primary or auxiliary control Check adjustment Set the maximum setting Place trouble light between the black and white leads No light indicates that no power is going Primary or auxiliar...

Page 22: ...pect the nozzle for plugged Nozzle strainer plugged Replace nozzle with the same size spray angle and spray type spect t e o e o p ugged orifice or carbon build up around orifice Poor or off center spray type Fouled or shorted electrodes Clean electrode leads Dirty electrodes and leads Clean electrode leads Eroded electrode tips Cl l t d ti d t Improper electrode gap spacing Clean electrode tips a...

Page 23: ...tinues to run d t l k Too much air lean short fire Reduce combustion air check combustion Poor Fire does not lock out of safety fault may be Too little air long dirty fire Increase combustion air check combustion fault may be due to poor fire Inspect fi Excessive draft Adjust barometric damper for correct draft After burner p fire Too little draft or restriction Correct draft or remove restric tio...

Page 24: ...roperly rotating wheel Restrictions in return or supply air system Correct cause of restriction Adjustable limit control set too low Reset limit to maximum stop setting Power If voltage fluctuates fault is in the power source Recheck voltage Loose wiring connection Locate and secure connection Power power source Recheck voltage at the power source Low or fluctuating line voltage Call power company...

Page 25: ...tack tem reading more than a trace Incorrect burner head adjust ment Correct burner setting CO2 stack tem perature and smoke Too little combustion air Increase combustion air smoke Too little blower air Increase blower speed to maintain proper temp rise High stack tem Blower belt too loose if equipped Tighten blower belt High stack tem perature is more than Dirty or plugged heat exchanger Clean he...

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