SECTION 15: R
EPLACEMENT
P
ARTS
43 of 47
15.6 Pressure Switch
P
u
ll off 3
w
ay connector. Spring open plastic clips of mo
u
nting cradle. Replace
w
ith correct type of press
u
re
s
w
itch for model. The press
u
re s
w
itches are color coded for each press
u
re setting.
Carry o
u
t a start-
u
p after
w
orking on or changing a press
u
re s
w
itch.
See Page 26, Section 11
.
15.7 I
g
nition Control
The control mo
u
nts to the heat exchanger plate. P
u
ll o
u
t ignition cable and
w
iring from board, noting their
positions. Release the fo
u
r mo
u
nting standoffs. Refit in reverse. Ens
u
re correct location of ignition cable
and all other
w
iring.
15.
8
Limit Switches
15.
8
.1 Removal and Replacement
1. Remove the electrical connections to the s
w
itch.
2. Unscre
w
the t
w
o scre
w
s sec
u
ring the s
w
itch.
3. Fit a ne
w
s
w
itch
w
ith t
w
o scre
w
s.
4. Reconnect the electrical connections and test operation.
MODEL
UHD[X][S] 75
UHD[X][S]100
UHD[X][S] 125
Pressure Switch Kit P/N
90439810
90439810
90439803
Color Code
black
black
gray
Set Point in
w
c
.35
.35
.41
Press
u
re S
w
itch Snap Ring P/N
90439850
90439850
90439850
Summary of Contents for UHD 75
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Page 29: ...SECTION 9 GAS PIPING 21 of 47 Figure 14 Gas Connection...
Page 43: ...SECTION 14 TROUBLESHOOTING 35 of 47 14 1 General...
Page 54: ...UHD LOW PROFILE DUCT FURNACE INSTALLATION OPERATION AND SERVICE MANUAL 46 of 47...
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