Premier Ductable
Heater
Owner’s Manual •
Premier 350DF 2.0
17
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. Clean the heater’s orifice with compressed air or
a soft, dry rag. Do not use files, drills, broaches,
etc. to clean the orifice hole. Doing so will enlarge
the hole, causing combustion or ignition problems.
Replace the orifice if it cannot be cleaned properly.
3. The high limit switches, heat/vent switch and ther-
mostat can be tested by disconnecting the leads at
the component and jumpering 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..
4. 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
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
heater components or gas train components
such as gas valves, or gas hoses.
■ 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.
5. Open the respective case panel for access to
burner or fan related components.
6. For reassembly, reverse the respective service
procedure. Ensure gas connections are tightened
securely.
7. After servicing, start the heater to ensure proper
operation and check for gas leaks.
8. If pulley or fan keys are lost during service, re-
placements are made by using 3/16 in. (4.7 mm.)
square x 1 in. (2.54 cm) bar stock. Otherwise,
order Part #22955.
Belt Replacement
1. Remove the belt guard from the heater.
See Fig. 16.
2. Rotate the fan pulley CCW while carefully lifting
the belt so it clears the fan pulley groove. See
Fig.17.
3. Check the fan and motor pulleys for dirt. Clean
the pulleys if needed.
4. When reinstalling the belt, ensure the arrows are
directed CCW. See Fig. 18.
FIG. 16
Belt guard
