1.
Remove bolt and nut securing motor to its mounting
support. See Fig. 6.
2.
Remove motor assembly from heater.
FIG. 6
3.
Loosen set screw on fan blade and remove fan from
motor. See Fig. 6.
4.
Ensure end of motor shaft is flush with fan side
opposite hub, and set screw is positioned over flat of
motor shaft. See Fig. 7. Motor must be centered
within mounting support. See Fig. 6.
FIG. 7
Service Instructions
1.
Close the fuel supply valve to the heater and
disconnect the electrical supply before servicing
unless necessary for your service procedure.
2. Remove the heater top or the side panels for access
to heater components.
3
Disconnect the appropriate electrical leads for the
component being replaced.
4. The auto reset backflash, ON/OFF switch, and
thermostat can be tested by disconnecting the leads
at the component, and placing a jumper connecting
the leads together.:
-- Reconnect the electrical supply and open fuel
supply valves.
-- If the heater lights, the component is defective
and must be replaced.
-- Do not leave the jumper on or operate the heater if
the part is defective. Replace the part immediately.
-- An alternate method for checking the components
is to perform a continuity check..
5. The air proving switch must not be jumpered. If
jumpered, the ignition control will not allow heater
operation. Test the air proving switch for continuity.
If defective, replace the switch
6. For reassembly, reverse the respective ser vice
procedure. Ensure gas connections are tightened
securely.
7. After servicing, start the heater to ensure proper
operation and check for gas leaks.
8. Clean the heater’s orifice with compressed air or a
soft, dry rag. Do not use files, drills, broaches, etc. to
clean the orifice. Doing so may enlarge the hole,
causing combustion or ignition problems. Replace
the orifice if it cannot be cleaned properly.
WARNING
Burn Hazard
■
Some 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 heater
components or gas train components.
■
All component parts must be replaced if defects are
found.
■
Failure to follow this warning will result in fire or
explosions, causing property damage, injury, or death.
GENERAL
MOTOR AND FAN
SET
SCREW
BOLT
NUT
SUPPORT
SHAFT END
14
12
Summary of Contents for CP155
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