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SECTION 15: REPLACEMENT PARTS
45 of 51
15.7 Pressure Switch
Pull off 3 way connector. Spring open plastic clips of mounting cradle. Replace with correct type of
pressure switch for model. The pressure switches are color coded for each pressure setting.
Carry out a start-up after working on or changing a pressure switch. See Page 27, Section 11.
15.8 Ignition Control
The control mounts to the electrical plate. Pull out ignition cable and wiring from board, noting their
positions. Release the four mounting standoffs. Refit in reverse. Ensure correct location of ignition cable
and all other wiring.
15.9 Axial Fan/Guard/Motor Assembly
The axial fan unit for the heater is supplied completely assembled and balanced
MODEL
UHA[X][S]
150 - 175
UHA[X][S]
200 - 225
UHA[X][S]
250
UHA[X][S]
300 - 350
UHA[X][S]
400
Pressure Switch
Kit P/N
90439802 90439808 90439803 90439807 90439808
Color Code
yellow orange gray brown orange
Set Point in. w.c.
.32.79.41.68.79
Pressure Switch Snap
Ring P/N
90439850 90439850 90439850 90439850 90439850
MODEL UHA[X][S] 150 - 175 UHA[X][S] 200- 250 UHA[X][S] 300 - 400
Axial Fan Guard 91901104 91901104 91901105
Axial Fan Motor 90600107 90600107 90600106
Axial Fan Blade 90709006 90709006 90709005