Service Instructions; General; Motor & Fan Assembly; Air Proving Switch - L.B. White GreenGro Plus HD220 Owner's Manual And Instructions

WARNING
Burn Hazard
■
Heater surfaces are hot for a period of time after the
heater has been shut down.
■
Allow the heater to cool before performing service,
maintenance, or cleaning.
■
Failure to follow this warning will result in burns
causing injury.
WARNING
Fire and Explosion Hazard
■
Do not disassemble or attempt to repair any
component part of the heater, including regulators
and gas hoses.
■
All components must be replaced if defects are
found.
■
Failure to follow this warning will result in gas leaks.
■
Gas leaks cause fire or explosions, leading to
property damage, injury, or death.
1. Open the case fan access panel, and disconnect the
motor leads.
2. Remove the motor mounting plate screws and pull
the fan and motor assembly from the housing.
3. Loosen the square head set screw(s) on the fan
wheel.
4. Pull the fan wheel from the motor shaft. Use a wheel
puller if necessary.
5. Remove the four (4) nuts securing the motor to the
mounting plate.
1. Open the motor end access panel and disconnect the
air-proving switch leads.
2. Remove the air proving switch mounting nuts and pull
the switch from the fan housing panel.
3. The replacement switch includes appropriate quantity
of mounting screws and nuts. Slide the switch onto
the screws and secure into place with the two nuts.
4. Reconnect the heater to its electrical supply and open
the fuel supply valves to the heater.
5. Close and latch the access panel. Start the heater
and check for proper operation.

Service Instructions

1. Close the fuel supply valve to the heater and
disconnect the heater's electrical supply before
servicing unless it is necessary to have the valve open
and electrical supply connected for your service
procedure.
2. For reassembly, reverse the respective service
procedure. Ensure gas connections are tightened
securely.
3. After servicing, start the heater to ensure proper
operation and check for gas leaks.
4. Clean the heater's burner orifice with compressed
air or a soft, dry rag. Do not use files, drills, etc. to
clean the orifice hole. Doing so may enlarge the
hole, causing combustion or ignition problems.
Replace the orifice if it cannot be cleaned properly.
MOTOR AND FAN WHEEL ASSEMBLY
NOTES: a. Fan wheel to motor mount plate spacing must be
adjusted to the clearance specified in the table
below before tightening the fan wheel to the
motor shaft.
b. Make sure that set screw(s) of the fan are on the
flats of motor shaft when tightening.
FIG. 12
MOTOR MOUNT PLATE
MOTOR
FIG. 13
NUTS (4)
SWITCH
NUTS (2)

GENERAL

FAN WHEEL
1/8 IN.
CLEARANCE

AIR PROVING SWITCH

FAN HOUSING PANEL
SCREW (2)
16