Weather-Rite UHA100, Installation, Operation & Service Manual

Page: 55 / 64

SECTION 15: R
EPLACEMENT
P
ARTS
47 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 28, Section 11 .
15.8 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.
15.9 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
90439804 90439804 90439804 90439804 90439805 90439803
Color Code
white white white white blue grey
Set Point in. wc
0.47 0.47 0.47 0.47 0.55 0.41
Pressure Switch
Snap Ring P/N
90439850 90439850 90439850 90439850 90439850 90439850
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[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