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UHA UNIT HEATER INSTALLATION OPERATION AND SERVICE MANUAL
36
14.7 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 commission after working on or changing a pressure switch. See Page 19, Section 10.
14.8 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.
14.9 Axial Fan/Guard/Motor Assembly
The axial fan unit for the heater is supplied completely assembled and balanced
Carbon Monoxide Hazard
Use correct pressure switch specified for each model.
Use of incorrect pressure switch or disabling
pressure switch circuit could cause unsafe condition.
Failure to follow these instructions can result in
death or serious injury.
WARNING
MODEL
UHA[S]
150 - 175
UHA[S]
200 - 225
UHA[S]
250
UHA[S]
300 - 350
UHA[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[S] 150 - 175 UHA[S] 200- 250 UHA[S] 300 - 400
Axial Fan Guard 91901105 91901104 91901105
Axial Fan Motor 90600106 90600107 90600106
Axial Fan Blade 90709005 90709006 90709005