15
Pressure Switch Relocation
In some inducer orientations, the inducer pressure switch
may interfere with gas pipe installation. Determine the
side of the cabinet the gas pipe will enter and see if the
inducer pressure switch needs to be moved. If the pressure
switch interferes with the gas pipe, please follow these
instructions for relocating it to the alternate location:
1. Shut off any electrical power to the furnace.
2. Label and disconnect the tubing and wires from the
pressure switch (Figure 11).
3. Remove two screws securing the pressure switch to
the inducer housing.
4. Remove the pressure switch from the mounts on the
inducer housing and relocate it to the other set of
mounts 90° from previous location.
5. Secure the pressure switch with two screws.
6. Reconnect the tubes and wires to the pressure switch.
Figure 10. Inducer Assembly Rotation
RCY
G
W
STATUS
FLAME
180
COOL
HEA
T
120
90
60
BLOWER
OFF
DELAY
LO
W
ML
MH
HIGH
EA
C
L1
XFMR
HUM
24V
L1A
NEUTRALS
2
7
8
9
2
FA
N
2
5
1
3
6
4
Figure 11. Alternate Pressure Switch Location
PRIMARY
LOCATION
ALTERNATE
LOCATION
3
1
Special Instructions for SC038-23A Furnaces
If furnace is to be installed horizontally with airfl ow
going from left to right, the pressure switch will need to
be moved to the side of the furnace that is not facing
the ground (Figure 12). Moving the switch will make
it easier to replace in the future.
1. Shut off any electrical power to the furnace.
2. Label and disconnect the tubing and wires from the
pressure switch (1).
3. Remove two screws (2) securing the pressure switch
(1) to the side of the furnace.
4. Remove two 1/4” black plugs (3) on the opposite
side of the cabinet that the pressure switch will be
relocated to.
5. Position the pressure switch (1) in its new location
and secure it in place using the same screws (2)
removed in step 2
6. Insert the plugs (3) into the holes on the side that
the pressure switch (1) was removed from.
7. Reconnect the tubing and wiring to the pressure
switch (1) being careful that they will not fall into the
burner box.
CAUTION:
It is extremely important that all wires and
tubes be correctly reattached to the pressure
switch(s). Failure to do so will result in
malfunction or compromised safety functions
of the furnace.
8. Check the furnace for proper operation as directed
in Startup and Adjustments section. If the furnace
shuts down during the pre-purge, the switch that
measures pressure in the header needs to be checked
for correct tubing connections.
Figure 12. SC038-23A Pressure Switch
2