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function properly. The draft regulator, when installed 
should be in the same room or enclosure as the furnace 
and should not interfere with the combustion air supplied 
to the burner. The control should also be located near 
the furnace flue outlet and installed according to the 
instructions supplied with the regulator. The flue outlet 
pressure (measured between the furnace and draft 
regulator, or the oil burner mounting plate over-fired draft 
access port.  fig. 2) should be set to -0.02 in. w.c. 

8.  OPTIONAL SIDE WALL VENTING 

O4HD-091A-14-FA-DV furnace models are 
manufactured to be installed as sidewall vented units. 
Please refer to Direct Venting Instructions, P/N 
240005236 included with the Vent Kit for details. Sidewall 
Venting (

Direct Venting

) requires the use of a specific oil 

burner; the Beckett AFII. Please refer to Appendix A, 
Table A2. 

Note: Sidewall venting requires special attention to 
combustion air supply. There is no natural draft in the 
venting system between furnace cycles; therefore, if the 
indoor pressure is negative relative to the outdoors, the 
vent terminal becomes a point of infiltration. This could 
lead to oil odour control problems. This problem is 
rectified by the use of ducted outdoor air for combustion 
(semi-sealed combustion), using the Beckett AFII oil 
burner. See Direct Vent Instructions supplied with the 
Vent Kits.

 

9a.  FAN TIMER BOARD AND LIMIT CONTROL  

(FIG. 4) (page 22) 

The Electronic Fan Timer integrates control of all burner 
and circulator fan operations. This control is the central 
wiring point for most of the electrical components in the 
furnace. The 

United Technologies 1158-120  (O4HD-

091A-12-FB and 

O4HD-091A-14-FA-DV)

 has an 

adjustable fan on time that is set by selecting the 
dipswitch combination displayed in Chart 1. This fan on 
delay can be set at 1, 2, 4 or 6 minutes. This provides a 
delay between the burner ignition and blower start-up to 
eliminate excessive flow of cold air when the blower 
comes on. The 

United Technologies 1158-120 (O4HD-

091A-12-FB and 

O4HD-091A-14-FA-DV) 

has an 

adjustable fan off time of 30, 60, 90 or 120 seconds 
displayed in Chart 1. The fan off delay time starts when 
the burner motor is de-energized at the end of a call for 
heat. Blower shutdown is delayed to remove any residual 
heat from the heat exchanger and improve the annual 
efficiency of the furnace. 

The electronic fan timer board works in conjunction with 
snap disc limit controls, which perform a safety function, 
and breaks power to the oil burner primary control, which 
shuts off the burner if the furnace over-heats. The limit 
control is thermally operated and automatically resets. 
The limit control is factory installed, pre-set and is not 
adjustable.   

 

If the limit control opens with the 

United 

Technologies  1158-120 (O4HD-091A-12-FB and 

O4HD-091A-14-FA-DV) 

electronic fan control

the 

circulating fan will be energized as well. When the 
limit closes, the fan off timer will begin. At the end of 
the fan off time cycle the burner will be energized, 
initiating a normal burner cycle.

  

CHART 1 

United Technologies 1158-120 (O4HD-091A-

12-FB and O4HD-091A-14-FA-DV) 

Dip Switch Position 

Blower Delay Times 

On 

Seconds 

Off 

Minutes 

Off Off   

 

30 

 

On Off   

 

60 

 

Off On   

 

90 

 

On On   

 

120 

 

  

Off 

Off   

  

On 

Off   

  

Off 

On   

  

On 

On   

 

9b.  FAN TIMER BOARD AND LIMIT 

CONTROL (FIG. 5) (page 22) 

The 

United Technologies 1168-1 ECM (O4HD-

091A-V-FA) 

tap board has an adjustable fan on/off 

delay that must be adjusted in accordance with the 
furnace input rating (nozzle size).  Refer to Table A-
10 (pg 15) for ECM blower set-up.

 

10.  ELECTRICAL CONNECTIONS 

The furnace is listed by the Canadian Standards 
Association under the NRTL (North American) 
Standard. It is factory wired and requires minimal 
field wiring. All field wiring should conform to 
CAN/CSA C22.1 Canadian Electrical Code, Part 1, 
and by local codes, where they prevail. In the United 
States, the wiring must be in accordance with the 
National Fire Protection Association NFPA-70, 
National Electrical Code, and with local codes and 
regulations. 

The furnace should be wired to a separate and 
dedicated circuit in the main electrical panel; 
however, accessory equipment such as electronic 
air cleaners and humidifiers may be included on the 
furnace circuit. Although a suitably located circuit 
breaker can be used as a service switch, a separate 
service switch is advisable. The service switch is 
necessary if reaching the circuit breaker involves 
becoming close to the furnace, or if the furnace is 
located between the circuit breaker and the means 
of entry to the furnace room. The furnace switch 

5

Summary of Contents for O4HD-091A-12-FB

Page 1: ...not store or use gasoline or other flammable liquids or vapors in the vicinity of this or any other appliance ALL INSTALLATIONS MUST MEET ALL LOCAL PROVINCIAL STATE AND FEDERAL CODES WHICH MAY DIFFER...

Page 2: ...ER PRIMARY SAFETY CONTROL 7 18 COMBUSTION CHAMBER 7 19a 19b CIRCULATING AIR BLOWER 7 20 MAINTENANCE AND SERVICE 8 21 OPERATING INSTRUCTIONS 9 22 ECM BLOWER MOTOR OPERATION 9 APPENDIX A O4HD 091A 12 FB...

Page 3: ...red The furnace should be carefully inspected for damage when being unpacked 2 HEAT LOSS The maximum hourly heat loss for each heated space shall be calculated in accordance with the procedures descri...

Page 4: ...is installed in a full basement infiltration is normally adequate to provide air for combustion and draft operation Furnace rooms under 65m 700 ft should automatically be treated as confined space 6 C...

Page 5: ...at the end of a call for heat Blower shutdown is delayed to remove any residual heat from the heat exchanger and improve the annual efficiency of the furnace The electronic fan timer board works in co...

Page 6: ...rmers 12 PIPING INSTALLATION The entire fuel system should be installed in accordance with the requirement of CAN CSA B 139 and local regulations Use only an approved fuel oil tanks piping fittings an...

Page 7: ...ER UNLESS THE BLOWER ACCESS DOOR IS SECURED IN PLACE 19a CIRCULATING AIR BLOWER O4HD 091A 12 FB The O4HD 091A 12 FB O4HD 091A 14 FA DV and O4HD 091A V FA furnace models are equipped with direct drive...

Page 8: ...s of the same size and type See Appendix A Table A 8 During the routine service inspect the general condition of the furnace watching for signs of oil leaks in the vicinity of the oil burner soot form...

Page 9: ...ive blower motor Restore the electrical power to the furnace and set the thermostat above room temperature After three or four minutes of burner operation the limit control should turn the burner off...

Page 10: ...TTEMPT TO START THE BURNER WHEN EXCESS OIL HAS ACCUMULATED WHEN THE FURNACE IS FULL OF VAPOUR OR WHEN THE COMBUSTION CHAMBER IS VERY HOT NEVER BURN GARBAGE OR PAPER IN THE FURNACE AND NEVER LEAVE PAPE...

Page 11: ...80 A 100 psig 0 50 usgph F3 3 in O4HD 091A 12 FB O4HD 091A 12 FB 76 000 AF76BNHS 0 65 80 A 100 psig 0 65 usgph F3 3 in O4HD 105A 12 FB O4HD 105A 12 FB 86 000 AF76BNHS 0 75 80 A 100 psig 0 75 usgph F3...

Page 12: ...cone to the nozzle face is increased to 1 3 8 inches A 3 START UP The furnace should be operated for a minimum of 10 minutes to reach steady state conditions before fine tuning combustion The warm up...

Page 13: ...10T DD Med Low 1 2 HP Med High 1 2 HP 3 1 2 HP 690 1500 O4HD 105A 12 FB O4HD 105A 14 FA DV 100 10T DD Med High 1 2 HP High 1 2 HP 3 1 2 HP 690 1500 Table A 7 Direct Drive Blower Characteristics PSC M...

Page 14: ...istics ECM Motor CFM RANGE Continuous Heating Cooling Furnace Model Blower Motor HP Motor FLA T Fan 0 28 0 48 inches w c 0 5 inches w c O4HD 070A V FA O4HD 091A V FA O4HD 105A V FA 100 10 DD 1 2 HP EC...

Page 15: ...inet Plenum Openings Filter Shipping Weight Return LB Furnace Model Width Depth Height Supply Side Bottom Flue Diameter Type Size O4HD A 12 FB O4HD A 14 FA DV 070 105 22 30 3 4 49 5 8 20 x 20 14 x 22...

Page 16: ...SW3 ADJUST Heating Mode Increase OR decrease temperature rise respectively Cooling Mode Increase OR decrease CFM respectively INPUT DIP Switch Position AC Size 1 2 POS USGPH 1 2 POS TON OFF OFF A 0 65...

Page 17: ...L F interupteur a basse vitesse si quipp e AL limite auxiliaire si quipp e REQUIRED FOR CANADIAN INSTALLATIONS BLOCKED VENT SAFETY L BVS RIELLO 40F BURNER br leur BECKETT AF BURNER br leur 4 1 2 3 OR...

Page 18: ...TE blanc GND GROUND Terre VI VIOLET violet MOTOR 3 UNUSED BURNER 1 2 YL F IGNITER I soupappe VALVE V L1 FUSED DISCONNECT ON HOT LEG POWER SUPPLY 120 VAC 60 HZ alimentation 120 VAC 60Hz transformateur...

Page 19: ...fan adjustments can be made by moving the dipswitch settings on the timer control board for fan off delay To check the operation of the limit switch shut off power to the furnace Temporarily remove t...

Page 20: ...spark for 10 sec a Provides continuous spark after flame is sensed to assure that burner remains lit b Turns on LED diagnostic light c Starts carryover timer i Flame and call for heat are monitored I...

Page 21: ...FIGURE 4 UNITED TECHNOLOGIES 1158 120 FAN TIMER BOARD O4HD 091A 12 FB and O4HD 091A 14 FA DV FIGURE 5 UNITED TECHNOLOGIES 1168 1 ECM TAP BOARD O4HD 091A V FA 21...

Page 22: ...S TO IDLE STATE FLAME FLAME FLAME FLAME NO FLAME NO FLAME FLAME LOST FLAME LOST REMAINS IN IDLE STATE OIL PRIMARY CONTROL SEQUENCE of OPERATION LOCKOUT STATE OIL PRIMARY CONTROL Shuts off burner motor...

Page 23: ...ol shuts off burner Circulator fan is energized immediately at heat speed EFT opens the oil primary control T T connections Circulating fan runs as long as limit string stays open If there is a call f...

Page 24: ...sing the reset button The LED diagnostic light will flash the following code Table C 2 Cad Cell Resistance Flashes Resistance in Ohms 1 Less than 400 2 Between 400 800 3 Between 800 1600 4 Between 160...

Page 25: ...ad cell with new cad cell and recheck If indicator light does not turn off remove yellow lead wires from oil primary control and recheck If indicator light is still on replace the oil primary control...

Page 26: ...Step 7 6 Reset oil primary control by pushing in and releasing red reset button Indicator light continues to flash at 1 Hz rate Verify that the control is not in restricted mode See notes at end of th...

Page 27: ...ero each time a call for heat is successfully completed To reset from RESTRICTED MODE press and hold the reset button for 30 seconds When the LED flashes twice the device has reset NOTE Disable functi...

Page 28: ...aximum of 1500 in the presence of light Ensure that room light is not leaking into the cad cell compartment See diagnostic light section No fuel oil Check fuel oil supply Check that all hand operated...

Page 29: ...radiator Poor alignment between oil burner blast tube and fire pot Check alignment Blast tube should be centered with fire pot burner opening Oil burner head should be inch back from the inside surfac...

Page 30: ...oints and seams Insulate ductwork if necessary IMPORTANT FINAL CHECK OUT ENSURE THAT ALL SAFETY DEVICES AND ELECTRICAL COMPONENTS HAVE BEEN SET FOR NORMAL OPERATION ENSURE THAT ALL ELECTRICAL CONNECTI...

Page 31: ...al No Date Installed Contractor Contact Address Postal Code Telephone No After Hours No FUEL SUPPLIER Fuel Oil Supplier Contact Telephone No After Hours No IF DIFFERENT FROM INSTALLATION CONTRACTOR Se...

Page 32: ...240006333 29161 29163 19 Filter Frame 16 X 25 18020 20 Filter Frame End Support 5592B2 21 Filter 16 X 25 X 1 Permanent 2180023 24 Control Box 29362 25 Upper Door Panel 30164L Logo Bezel 28479 Logo La...

Page 33: ...DV Ref No Description Part No All parts are the same as listed on the previous pages for Models O4HD 091A 12 FB and O4HD 091A V FA except where noted below 12 Oil Burner Mounting Plate Assembly 29872...

Page 34: ...34...

Page 35: ...NOTES Nortek Global HVAC 8000 Phoenix Parkway O Fallon Missouri 63368 151B 0810 Replaces 151B 0909 Nortek Global HVAC LLC 2015 All Rights Reserved 35...

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