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151B0801 R5 3/28/2006

 

8

MANUAL FAN. 

When the manual fan switch on the 
thermostat is on, energizing G only, the 
blower will ramp to 50% of the selected 
cooling/heat pump airflow. 

SEE TABLE A.2 & A.3 FOR PROPER 
DIP SWITCH SETTINGS. (HEATING 
ONLY) 

SEE CHART ON COVER OF BLOWER 
CONTROL BOX FOR PROPER DIP 
SWITCH SETTINGS FOR AIR 
CONDITIONING.

   

DIRECT DRIVE 

The 

O4HD-***A-**-FA

 furnaces are 

equipped with a direct drive blower 
system. Direct drive blower speed 
adjustments are not normally required in 
properly sized extended plenum duct 
systems. The motor RPM and air CFM 
delivery will vary automatically to 
accommodate conditions within the usual 
range of external static pressures typical 
of residential duct systems. Under-sized 
duct systems may require a higher 
blower speed to obtain a reasonable 
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 
the direct drive blower motor. Selecting a 
lower blower speed may correct this 
problem. 
Direct drive blower speeds are adjusted 
by changing the "hot" wires to the motor 
winding connections. Please refer to 
wiring diagram in Appendix B or the 
wiring diagram label affixed to the 
furnace. 

THE NEUTRAL WIRE 

(normally the white wire) IS NEVER 
MOVED TO ADJUST THE BLOWER 
SPEED

.  

 

DO NOT CONNECT POWER LEADS 
BETWEEN MOTOR SPEEDS. THE 
NEUTRAL WIRE MUST ALWAYS BE 
CONNECTED TO THE MOTOR'S 
DESIGNATED NEUTRAL 
TERMINAL. 

It is possible and acceptable to use a 
single blower speed for both heating and 
cooling modes. The simplest method to 
connect the wiring from both modes is to 
use a "piggy-back connector" 
accommodating both wires on a single 
motor tap. It is also acceptable to 
connect the selected motor speed with a 

pigtail joined to both heating and cooling 
speed wires with a wire nut. As a safety 
precaution against accidental 
disconnection of the wires by vibration, it 
is advisable to secure the wire nut and 
wires with a few wraps of electricians 
tape. 
If the joining of the blower speed wiring 
is done in the furnace junction box, tape 
off both ends of the unused wire. 

FURNACE CONTROLS  

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 

Honeywell

 

EFT

 has a fixed fan delay on 

time of 30 seconds after the burner 
ignites. The 

United Technologies 1158-

120

 has an adjustable fan on time that is 

set by selecting the dipswitch 
combination displayed in Table 5. This 
fan on delay can be set at 30, 60, 90 or 
120 seconds. 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 

Honeywell

 

ST9103

 has an adjustable 

fan off time of 60, 90, 120 and 150 
seconds that is set by selecting a 
dipswitch combination on the control 
board displayed in chart 1. Similarly the 

United Technologies 1158-120 

have an 

adjustable fan off time of 2, 3, 4,or 6 
minutes displayed in Table 5. The fan off 
delay time starts when the burner 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 a limit control opens, the 

Honeywell

 

ST9103 

will energize the circulating fan. 

When the limit control closes the burner 
is re-energized and the heating cycle 
begins again.  
If the limit control opens with the 

United 

Technologies 1158-120 

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.

  

The circulating fan start-up and 
shutdown is immediate in the cooling 
mode.  

The heating mode “fan off” delay may be 
field adjusted by manipulating the 
dipswitches. See Table 5. 

Table 5: Heating “Blower Off/On” 
Timing 

Honeywell ST9103 

Dip Switch 

Position 

Blower Off Delay 

Time 

1 2 

 

On On 

60 

seconds 

On Off 

90 

seconds 

Off On 

120 

seconds 

Off Off 

150 

seconds 

United Technologies 1158-120 

Dip Switch Position 

Blower Delay 
Times 

1 2 3 4 On 

Sec. 

Off 
Min. 

Off Off  

 

30 

 

On Off  

 

60 

 

Off On  

 

90 

 

On On  

 

120 

 

  Off 

Off 

 

  On 

Off 

 

  Off 

On 

 

  On 

On 

 

 

DISCONNECT THE POWER SUPPLY 
TO THE FURNACE BEFORE 
OPENING THE BLOWER ACCESS 
DOOR TO SERVICE THE AIR FILTER, 
FAN AND MOTOR. FAILURE TO 
SHUT OFF POWER COULD ALLOW 
THE BLOWER TO START 
UNEXPECTEDLY, CREATING A RISK 
OF DEATH OR PERSONAL INJURY. 

 

DO NOT START THE BURNER OR 
BLOWER FAN UNLESS THE BLOWER 
ACCESS DOOR IS SECURELY IN 
PLACE. 

OIL BURNER 

O4HD furnaces are equipped with 
Beckett AFG Series oil burners. The oil 
burner must align properly with the 
cerafelt fiber chamber (firepot). The 
cerafelt fiber chamber is initially quite 
soft, but hardens and becomes quite 
brittle after the first firing. The firepot is 
held in place by a retaining bracket; 
however, it is possible for the firepot to 
shift if subjected to rough handling during 
transit. 

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

Page 1: ...WER ECM 8 FURNACE CONTROLS 9 OIL BURNER 9 FURNACE INSTALLATION SET UP 11 MAINTENANCE AND SERVICE 12 OPERATING INSTRUCTIONS 12 TABLE A 1 BECKETT OIL BURNER SET UP 13 TABLE A 2 DIRECT DRIVE BLOWER SET U...

Page 2: ...f Oil Burning Equipment as well as in accordance with local codes In Canada the installation of the furnace and related equipment shall be installed in accordance with the regulations of CAN CSA B139...

Page 3: ...able 1 Installation on a combustible floor requires a clearance of 1 inch Using a noncombustible material such as one inch thick channel iron or similar material can do this The furnace must be suppor...

Page 4: ...VRV INCLUDED IN THIS KIT MUST BE USED IN CONJUNCTION WITH THE FURNACE BOOT CHIMNEY VENTING The chimney must be sized correctly and be in good repair If the chimney is oversized there is a high risk o...

Page 5: ...on extension cord Change to straight or to long offset I Two or more openings to the same chimney Found by inspection from basement The least important opening must be closed using some other chimney...

Page 6: ...urnace may be installed with a one pipe system with gravity feed or lift The maximum allowable lift on a single line system is 8 feet Lift should be measured from the bottom outlet of the tank to the...

Page 7: ...tory is fed into pre programmed algorithms in the microprocessor to determine the correct motor output required to maintain constant airflow regardless of external static pressure The microprocessor a...

Page 8: ...ng the dipswitch combination displayed in Table 5 This fan on delay can be set at 30 60 90 or 120 seconds This provides a delay between the burner ignition and blower start up to eliminate excessive f...

Page 9: ...efficiency PREPARATIONS Drill a test port in the venting ideally at least 2 flue pipe diameters away from the furnace breeching if venting horizontally from the furnace or from the flue pipe elbow if...

Page 10: ...s ducts the inside radius of elbows etc The supply air temperature should be measured at a point where the thermometer will be well within the air stream near the furnace supply air outlet Usually the...

Page 11: ...tele spout oiler This oiler has a long flexible plastic spout DO NOT OVER LUBRICATE Excess oil may result in premature electric motor failure Inspect the blower fan Clean it if necessary Oil Burner Ma...

Page 12: ...f air passing through the oil burner combustion chamber breeching etc up the chimney between burner cycles NOTE THE USE OF THIS CONTROL CAN OCCASIONALLY CAUSE POST COMBUSTION NOZZLE DRIP TABLE A 2 DIR...

Page 13: ...w 1622 1602 1541 1499 1433 0 1 1 1215 1214 1214 1207 1204 1 0 0 1128 1108 1101 1095 1089 1 0 1 988 987 981 978 938 O4HD 091A V F 11 10 DD 9 6 50 80 F 0 0 0 788 787 781 777 756 1 1 0 1800 1800 1800 180...

Page 14: ...ir Width A Depth B Height C D x E Side F x G Bottom Dia Height H Filter Perm Ship Weight lb O4HD 091A 22 31 50 1 2 20 1 2 x 20 14 x 22 14 x 22 5 42 16 x 25 x 1 190 O4HD 140A 22 31 58 1 8 20 1 2 x 20 1...

Page 15: ...151B0801 R5 3 28 2006 15 APPENDIX A WIRING DIAGRAM O4HD 091A 12 FA and O4HD 140A 16 FA...

Page 16: ...151B0801 R5 3 28 2006 16 APPENDIX B WIRING DIAGRAM O4HD 091A V F and O4HD 140A V F...

Page 17: ...JURY PROPERTY DAMAGE OR DEATH ACCESSORIES The EFTB has provisions for supplying 115 volt power to an electronic air cleaner EAC as well as 115 volts to a line voltage humidifier or humidifier step dow...

Page 18: ...park 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 If...

Page 19: ...noid Valve LED Diagnostic Light RETURNS TO IDLE STATE FLAME FLAME FLAME FLAME NO FLAME NO FLAME FLAME LOST FLAME LOST REMAINS IN IDLE STATE R7184 SEQUENCE OF OPERATION LOCKOUT STATE R7184 Shuts off bu...

Page 20: ...0 seconds b Burner motor is de energized Even though thermostat is still calling for heat c If circulator fan has started it continues through the selected heat fan off delay period Established flame...

Page 21: ...t existing call for heat a Circulator fan turns off when heat fan off delay time is complete b Normal operation resumes electronic fan timer control is in standby mode awaiting next thermostat command...

Page 22: ...shooting IMPORTANT Due to the potential hazard of line voltage only a trained experienced service technician should perform the troubleshooting procedure PRELIMINARY STEPS Check the diagnostic light f...

Page 23: ...ce the R7184 control If the indicator light turns off replace cad cell bracket assembly Burner starts Trouble is in thermostat circuit Check thermostat wiring connections If connections are clean and...

Page 24: ...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 25: ...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 function P...

Page 26: ...ht a maximum 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 ope...

Page 27: ...r 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 surf...

Page 28: ...re rise Slow down blower fan if necessary Supply air temperature too cool Excessive duct losses Check supply air ductwork Seal leaky joints and seams Insulate ductwork if necessary Fan control fan on...

Page 29: ...151B0801 R5 3 28 2006 29 PARTS...

Page 30: ...Filter 16 x 25 x 1 Permanent 2180023 23 Filter Frame End Support 5592B2 24 Junction Box 28723 25 Junction Box Cover 28722 26 Blower Assembly Complete Direct Drive 3 4 hp ECM O4HD 091A V F 30381 26a Bl...

Page 31: ...unit 29161 20 Clean out Cover 2 per unit 29162 21 Filter Frame 16 x 25 x 1 18020 22 Filter Frame End Support 5592B2 23 Air Filter 16 x 25 x 1 Permanent 2180023 24 Junction Box 28723 25 Junction Box Co...

Page 32: ...e Installed Contractor Contact Address Postal Code Telephone No After Hours No Service Contractor if different from Installation Contractor Service Tech Telephone No After Hours No Fuel Supplier Oil S...

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