Instructions for Installation of Oil
Furnace Circulating Fan Upgrade Kits
For Furnace Models:
CHB68-112 CHC68-96 CLBF68-112
CLBR68-112
: Failure to follow these instructions exactly may result in a fire or
explosion causing property damage, personal injury or loss of life.
DO NOT store or use gasoline or other flammable vapors and liquids in the vicinity of
this or any other appliance.
What to do if you find an oil leak:
• DO NOT try to operate this appliance.
• If possible, close the manual fuel shut of f valve on the oil suppl y tank.
• Immediately call your oil supplier. Follow the oil supplier’s instructions.
• If you cannot reach your oil supplier, call the fire department.
A qualified installer, service agency, or the oil supplier must perform installation and
service.
These instructions should be:
XX-XXX
ECNXXXX
• read prior to installation.
• retained for qualified service personnel
•
reviewed before performing any service or maintenance.
Crown Boiler Company
3633 “I” Street
Philadelphia, Pennsylvania 19134
Only qualified service personnel shall perform installation and service.
Introduction:
These instructions list the steps required to field install a larger centrifugal blower
and ¾ HP motor assembly in any of the Crown oil-fired furnace models previously
noted. A blower upgrade kit will produce an increase in high-speed airflow to enable
the furnace to support an evaporator coil capable of producing approximately four
(4) tons of direct expansion cooling.
NOTICE: The blower upgrade kit is equipped with a ¾ HP, PSC-type, fan
motor. Electrical service to the furnace may have to be upgraded, in certain
situations, to support the larger motor.
Table 1: Electrical Power Supply Requirements for a Furnace Equipped w/
Standard or Upgrade Motors
Standard ½ HP Motor Upgrade ¾ HP Motor
Total Current (A) 10.2 13.6
Minimum Circuit Ampacity (A) 12.1 16.4
Maximum Fuse Size (A) 15 20
Installation:
A. Remove the Standard Blower / Motor Assembly
! WARNING: If the heating system was recently operating, allow the
furnace to cool to room temperature before proceeding with disassembly.
! WARNING: BEFORE disconnecting the furnace wiring harness at the
blower terminal block, use a voltmeter (or equivalent device) to measure
the electrical potential across the red and white wires and the orange and
white wires at the terminal block. No (zero) voltage readings confirm power
to the blower is off.
! CAUTION: On horizontal / counterflow models, the auxiliary high limit
thermostat may interfere with easily removing the blower from the furnace.
To avoid damaging the thermostat, temporarily remove the thermostat
BEFORE removing the blower. Loosen two (2) sheet metal screws fixing
the thermostat to the blower support panel and carefully move the
thermostat to the side. Retain these fasteners for later reuse. It should not
be necessary to disconnect the electrical wiring from the thermostat.
1. Set the room thermostat operating mode to “OFF” and shutoff electrical
power to furnace at the disconnecting switch.
2. Remove the blower access panel.
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Only qualified service personnel shall perform installation and service.
• On highboy models, this panel will be the lower access panel on the
front of the furnace.
! On lowboy models, remove the access panel at the rear of the furnace
to reach the blower.
o On horizontal / counterflow models, this panel will be the upper access
panel on the front of the furnace.
3. Locate the blower terminal block mounted on the scroll of the blower.
Disconnect the three (3) lead wires that connect the furnace wiring harness
cable to the terminal block. Temporarily tape, or tie back, out of the way the
loose end of the wiring harness cable.
4. Remove the fasteners fixing the blower mounting angles or legs in place.
Retain the fasteners for later reuse.
• On highboy models, remove the burner access panel (located just above
the blower access panel). Then, remove two (2) sheet metal screws
[located about seven (7) inches back from the front surface of the furnace]
driven downward through the blower support panel, and into the support
angles, refer to Figure 1.
(Show depiction here of highboy blower compartment, blower assy.,
retaining screws, and mounting angles and rails. ID components)
Figure 1: Blower Assembly Retaining Screw Locations on the
Highboy Oil Furnace
! On lowboy models, remove two (2) sheet metal screws (and flat
washers) driven downward through legs and into the base panel about
three (3) inches back from the rear of the furnace, refer to Figure 2.
(Show depiction here of lowboy blower compartment, blower assy.,
retaining hardware, blower mounting legs, motor grounding strap. ID
components)
Figure 2: Blower Assembly Retaining Screw Locations on the
Lowboy Oil Furnace
o On horizontal / counterflow models, remove four (4) sheet metal
screws [two (2) on either side of the bower scroll] driven downward
through support angles and into the blower support panel, refer to
Figure 3.
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Only qualified service personnel shall perform installation and service.
(Show depiction here of horizontal / counterflow blower compartment,
blower assy., retaining screws, mounting angles, and auxiliary high limit
thermostat. ID components.)
Figure 3: Blower Assembly Retaining Screw Locations on the
Horizontal / Counterflow Oil Furnace
5. Remove the entire blower / motor assembly from the furnace. Set it aside.
• On highboy models, pull forward and slide the blower out of the furnace.
! On lowboy models, lift-up slightly and pull the blower out of the rear of
the furnace.
o On horizontal / counterflow models, lift and pull the blower out of the
furnace.
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Only qualified service personnel shall perform installation and service.
B. Install the Upgrade Blower / Motor Assembly
! CAUTION: On horizontal / counterflow models, if the auxiliary high limit
thermostat was removed from the furnace (in Step A5, above), reuse the
original fasteners to reattach the thermostat to the blower support panel in
the original mounting position AFTER installing the upgrade blower.
1. Move the upgrade blower / motor assembly into position within the furnace
blower compartment. Orient the blower / motor assembly such that the
terminal blocks are positioned on the surface of the blower scroll toward the
installer.
• On highboy models, engage the blower support angles in the slots
formed by the blower rails on the underside of the blower support panel.
Slide the blower / motor assembly completely rearward into the furnace.
! On lowboy models, set the blower down in the furnace and push the
blower through the rear separator panel until about one (1) inch of the
snout of the scroll protrudes through the rear separator panel of the
furnace.
o On horizontal / counterflow models, set the blower down in the furnace
and center it over the blower support panel opening.
2. Reinstall the fasteners fixing the blower mounting angles or legs in place.
• On highboy models, align the holes in the support angles with the holes
in the blower support panel. Drive two (2) sheet metal screws downward
through the blower support panel holes and into the holes in the support
angles to secure the blower assembly. Reinstall the burner access panel.
! On lowboy models, center the blower from side to side within the
opening of the rear separator panel. To secure the blower / motor
assembly, capture a flat washer under the head of each screw. Trap the
ring terminal of the blower motor ground lead between the left-hand (LH)
side blower leg and the base panel. Drive a sheet metal screw downward
through the center of the rubber grommet in each leg (located about three
(3) inches back from the rear of the furnace) and into the base panel. The
LH side screw should pass through the ring terminal.
o On horizontal / counterflow models, using the holes in the blower
support angles as guides, drive four (4) sheet metal screws [two (2) on
either side of the bower scroll] downward through the support angles and
into the blower support panel to secure the blower assembly.
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Only qualified service personnel shall perform installation and service.
3. Reconnect the three (3) furnace wiring harness leads to the terminal block
located on the blower scroll. For all furnace models:
• Connect the red wire (cooling fan speed) to the terminal block labeled “H”.
• Temporarily, connect the orange wire (heating fan speed) to the terminal
block labeled “L”.
• Connect the white wire to the terminal block labeled “C”.
Refer to “Supply / Return Airflow and Air Temperature” section of the Crown
Oil-Fired Central Furnace Installation, Operation, and Service Manual with
Users Information Section for a procedure to select the heating fan speed.
4. Replace the blower access panel.
5. Restore electrical power to the furnace at the disconnecting switch and set
the room thermostat operating mode to “ON”.
6. Adjust the room thermostat to cause the furnace to operate through at least
one (1) complete heating or cooling cycle to test operation of the blower.
Setting the thermostat to the “FAN” or “FAN ON” position should cause the
blower to run continuously on high speed.
7. The blower should accelerate from rest to full speed within about ten (10)
seconds, or less. Blower operation should be smooth without clattering or
rattling noises. If blower operation generates unusual noises, check for loose
fasteners and parts in the furnace. Remove, tighten, or secure all loose parts.
Blower pulsation (sometimes called “hunting”) usually indicates the duct
system is too restrictive. Also, consult the furnace instruction manual for
blower troubleshooting steps.
8. Package the standard blower / motor assembly in the shipping carton for the
upgrade blower / motor assembly. Contact your dealer or distributor regarding
the possibility of returning the standard blower / motor assembly for credit
against your account.
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