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240011511 REV. C [05/31/2017]

18.  Oil Burner Nozzles

Furnaces are certified for multiple firing rates. Furnace may be 

fired at ideal rate for wide range of structures by manipulating oil 

burner setup and blower settings. Refer to Table A-1 thru A-9, and 

furnace rating plate to determine proper combinations. Nozzles for 

alternate firing rates are included with furnace.

19.  Oil Burner Adjustment

•  Adjust burner air supply to maintain fuel to air ratio to obtain 

ideal combustion conditions. 

• 

Lack of air causes "soft" and "sooty" flames, resulting in soot 

build-up throughout heat exchanger passages. 

• 

Excess combustion air causes bright roaring fire and high 

stack temperatures resulting in poor fuel efficiency. 

• 

LRF and LRFV operate most efficiently with No. 1 smoke 

spot on Bacharach Scale. Dust will eventually build up on 

air moving components of oil burner assembly resulting in 

decreased air supply with potential soot build up in flue gas 

passageways of heat exchanger. Soot behaves as insulator 

and impairs good heat transfer. Stack temperature increases, 

and efficiency decreases. To avoid this problem, adjust the air 

supply as follows:

 

»

Chimney vented units 

- adjust air supply to provide no 

more than a trace smoke spot on the Bacharach scale.

 

»

Direct vented units 

- adjust air supply for zero smoke per 

the Direct Vent Supplement Installation, Operation and 

Maintenance Manual included with direct vent furnace.

20.  Burner Electrodes

Correct positioning of electrode tips with respect to each other, 

fuel oil nozzle, and burners is essential for smooth light ups and 

proper operation. 
Refer to oil burner instructions provided with furnace and 

Appendix A Section A.2 in this manual for electrode specifications.

21.  Burner Primary (Safety) Control

Furnace is equipped with primary combustion control, also 

referred to as burner relay or burner protector relay, which uses 

a cad cell located in burner housing, to monitor and control 

combustion. 
Dust or combustion residuals can build up on lens of cad cell 

impairing its response to flame. Check cad cell for cleanliness 

and proper alignment if primary control frequently shuts down 

combustion.

NOTICE

Do not tamper with furnace controls they are sensitive. 

If problems persist, call your service contractor.

 WARNING

Fire, burn, asphyxiation hazard. Do not start the 

burner unless blower access door is secured in place. 

Failure to follow these instructions could result in death 

or serious injury.  

!

  

22a.  CIRCULATING AIR BLOWER (LRF/LRFV)

•  LRF furnace models may be equipped with either direct 

drive or belt drive blower systems.

•  LRFV furnace models are equipped with direct drive blower 

systems.  

•  LRF models are equipped with PSC motors.
•  LRFV models are equipped with electronically commutated 

motors (ECM).  

  Direct Drive Blower Systems

•  Direct drive blower speed adjustments are not normally 

required in properly sized extended plenum duct systems. 

Motor RPM and air CFM delivery will vary automatically to 

accommodate conditions within usual range of external 

static pressures typical of residential duct systems. 

•  Under-sized duct systems may require higher blower speed 

to obtain system temperature rise. 

•  Some older duct systems were not designed to provide 

static pressure. They typically feature special reducing 

fittings at each branch run and lack block ends on the trunk 

ducts. These systems may require modification to provide 

some resistance to the airflow to prevent over-amping of 

direct drive blower motor. Selecting a lower blower speed 

may correct this problem. 

•  Direct drive blower speeds are adjusted by changing 

"hot" wires to motor winding connections. Refer to wiring 

diagrams in Appendix B or wiring diagram label affixed to 

furnace. 

• Do not move neutral wire (normally  white wire) to 

adjust blower speed.

•  Single blower speed for both heating and cooling modes 

may be used. Use a "piggy-back connector" accommodating 

both wires on a single motor tap. 

•  It is also acceptable to connect selected motor speed with a 

pigtail joined to both heating and cooling speed wires with 

a wire nut. 

•  Safety precaution against accidental disconnection of wires 

by vibration, secure wire nut and wires with few wraps of 

electricians tape.

• Do not connect power leads between motor speeds. 

Always connect neutral wire to motor's designated 

neutral terminal.

•  If joining blower speed wiring is done in furnace junction 

box, tape off both ends of unused wire.

• Do not use blower speed wires as source of power to 

accessories as electronic air cleaners and humidifier 

transformers.  Unused motor taps auto-generate 

sufficiently high voltages to damage accessory 

equipment.

Summary of Contents for LRF65

Page 1: ...RFV Lowboy Rear Flue Model with ECM Blower Oil Fired Warm Air Furnaces P N 240011511 Rev C 05 31 2017 ECR International 2210 Dwyer Avenue Utica NY 13501 web site www ecrinternational com INSTALLATION...

Page 2: ...Weight Width A Length B Height C Supply D x E Return F x G Diameter Height H LRF LRFV 22 53 33 8 20 x 18 20 x 18 8 5 29 20 x 20 x 1 240 LB 55 8 cm 135 9 cm 85 4 cm 52 1 cm x 45 7cm 52 1 cm x 47 3cm 1...

Page 3: ...ifier 7 16 Piping Installation 7 17 Oil Filter 7 18 Oil Burner Nozzles 8 19 Oil Burner Adjustment 8 20 Burner Electrodes 8 21 Burner Primary Safety Control 8 22a Circulating Air Blower LRF LRFV 8 22b...

Page 4: ...stitute of Canada HRAI or by other means prescribed or approved by the local authority having jurisdiction United States Manual J titled Load Calculation published by the Air Conditioning Contractors...

Page 5: ...furnace in parallel with or upstream from evaporator coil to avoid condensation in heat exchanger When installed in parallel prevent chilled air from entering furnace by use of dampers or other air c...

Page 6: ...oint for most of furnace electrical components United Technologies 1158 120 has an adjustable fan on time set by selecting dipswitch combination displayed in Chart 1 Fan on delay can be set at 30 60 9...

Page 7: ...rom electronic fan timer board where provisions have been made for connections but should have their own controls Do not use direct drive motor connections as a power source there is risk of damaging...

Page 8: ...itive If problems persist call your service contractor WARNING Fire burn asphyxiation hazard Do not start the burner unless blower access door is secured in place Failure to follow these instructions...

Page 9: ...gs Blower speed and on off time delays are handled by ECM motor programming and are set via dipswitches per Table A 10 Heating airflow rate is SW1 and on off delay is SW4 both are set according to fir...

Page 10: ...all for heat Burner should start It may be necessary to press RESET button on primary combustion control relay 2 There is a fan on time delay before circulating fan is energized United Technologies 11...

Page 11: ...GPH Head Air Setting LRF65 LRFV65 66 000 AFG70MPSS 0 50 45 W 140 0 55 L2 4 LRF80 LRFV80 78 000 AFG70MPSS 0 50 45 W 175 0 65 L2 5 LRF90 LRFV90 89 000 AFG70MPSS 0 60 60 W 175 0 75 L2 7 LRF100 LRFV100 10...

Page 12: ...3 APPENDIX A CHECK OUT AND ADJUSTMENTS Table A 4 Riello 40BF Burner Set Up Riello 40BF3 40BF5 Series Oil Burners For use with direct vent units using outdoor combustion air only Furnace Model Output...

Page 13: ...ce above horizontal center line 13 64 inch Distance ahead of nozzle 5 64 to 7 64 inch Carlin Burners Electrode gap 1 8 inch to 5 32 inch Distance above horizontal center line 5 16 inch Distance ahead...

Page 14: ...blower motor Isolate AC line voltage pins on 5 pin power connector with electrical tape to prevent electric shock hazard C Restore electrical power to furnace D Set thermostat above room temperature E...

Page 15: ...15 240011511 REV C 05 31 2017 APPENDIX A CHECK OUT AND ADJUSTMENTS FIGURE 3 UNITED TECHNOLOGIES 1168 1 ECM TAP BOARD LRFV FIGURE 2 UNITED TECHNOLOGIES 1158 120 FAN TIMER BOARD LRF...

Page 16: ...A CHECK OUT AND ADJUSTMENTS TIP Formulas will assist with design of duct work and determination of air flow delivery CFM Bonnet Output 1 085 x System Temperature Rise T System Temperature Rise T Bonn...

Page 17: ...ON is approximately equal to 400 CFM SW3 ADJUST Increase OR decrease CFM respectively APPENDIX A CHECK OUT AND ADJUSTMENTS Table A 11 Direct Drive Blower Characteristics 1 2 HP ECM Variable Speed Cons...

Page 18: ...11 Direct Drive Blower Characteristics 1 2 HP ECM Variable Speed Constant CFM Motor continued DELAY PROFILE FOR OIL HEATING SW4 DELAY DIP SWITCH POSITION INPUT USGPH PRE RUN ON DELAY TIME CFM LEVEL SH...

Page 19: ...19 240011511 REV C 05 31 2017 APPENDIX B WIRING DIAGRAMS Chimney Vent Furnace Wiring Diagram LRF LRFV...

Page 20: ...20 240011511 REV C 05 31 2017 APPENDIX B WIRING DIAGRAMS Direct Vent Furnace Wiring Diagram LRF LRFV...

Page 21: ...at cool speed Thermostat ends call for cool G and Y terminals are de energized Cooling contactor is de energized immediately Circulator fan turns off immediately FAN Thermostat begins call for fan G...

Page 22: ...stage of two stage cooling Y1 while Y Y2 is not calling The 24 VAC input signal is passed to pin 6 of P1 Blower runs at 80 of cooling speed profile FAN Thermostat calls for fan G The 24 VAC input sig...

Page 23: ...ay burn out heat anticipator of standard 24 vac thermostat or cause harm to components within micro electronic thermostat Before checking oil primary control perform these preliminary checks repair or...

Page 24: ...epair light leak if necessary Open safety switch Check for open limit or auxiliary limit Check internal wiring connections loose connectors etc Furnace will not start without first pushing oil primary...

Page 25: ...supplier Frozen oil line Gently warm oil line Insulate oil line Outdoor piping size may require increased diameter Oil burner sputtering at nozzle Electrodes out of adjustment or defective Check elec...

Page 26: ...e rise is too high speed up blower fan Defective high limit control Test high limit function of all limit switches Use duct thermometer to verify accuracy of limit control Check for obstructions to ai...

Page 27: ...05 31 2017 Model No Serial No Date Installed Contractor Contact Address Postal Code Telephone No After Hours No Fuel Supplier Fuel Oil Supplier Contact Telephone No After Hours No APPENDIX D HOMEOWNER...

Page 28: ...pe Assembly 3002317 23 Flue Pipe Insulator Pipe 29713 24 Flue Pipe Flange 109009797 25 Flue Pipe Gasket 3 per unit 240011382 26 Observation Port Sight Glass 240008235 27 Sight Glass Washer 109009449 2...

Page 29: ...BOF 130 F 30388 40 Oil Burner Assembly Beckett AFG70MPSS 0 50 45 W 550003220 Oil Burner Assembly Riello 40F3 0 55 80 B 550003221 Oil Burner Assembly Carlin EZ LF 0 50 70 B 550003222 41 Filter Side Rai...

Page 30: ...sure Switch for use with Beckett Burners 0 65 WC Blocked Vent Safety Switch 240011862 5 x 4 Appliance Adapter Connects Furnace to Vent Pipe 240011898 Combustion Air Intake Collar 4 for Beckett Burner...

Page 31: ...0011511 REV C 05 31 2017 PARTS LISTING Model LRF LRFV Diagram 1 2 3 4 8 7 9 11 14 15 16 16 27 28 30 31 32 33 34 36 37 42 40 25 21 15 18 13 41 25 24 23 22 25 29 35 20 10 19 19 17 38 8 5 41 6 26 16 31 3...

Page 32: ...ECR International 2210 Dwyer Avenue Utica NY 13501 web site www ecrinternational com...

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