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SECTION 14: REPLACEMENT PARTS
47
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 start-up
after working on or changing a pressure switch. See Page 29, Section 10.
.
14.8 Ignition Control
The control mounts to the heat exchanger 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.
MODEL UHA[X][S] 30 UHA[X][S] 45 UHA[X][S] 60 UHA[X][S] 75 UHA[X][S] 100 UHA[X][S] 125
Pressure Switch
Kit P/N
90439801 90439810 90439802 90439810 90439810 90439803
Color Code
pink black yellow black black gray
Set Point in. wc
.23 .35 .32 .35 .35 .41
Pressure Switch
Snap Ring P/N
90439850 90439850 90439850 90439850 90439850 90439850
MODEL UHA[X][S] 30 UHA[X][S] 45 UHA[X][S] 60 UHA[X][S] 75 UHA[X][S] 100 UHA[X][S] 125
Axial Fan Guard 91901103 91901103 91901102 91901102 91901102 91901102
Axial Fan Motor 90600104 90600104 90600105 90600105 90600106 90600106
Axial Fan Blade 90709004 90709003 90709002 90709001 90709001 90709001