RM7838B,C 7800 SERIES RELAY MODULE
15 32-00199—01
Fig. 6. Wiring subbase for RM7838C1020/RM7838C2020.
Mounting RM7838B,C Relay
Module
1. Mount the RM7838B,C vertically on the Q7800 Sub-
base, or mount horizontally with the knife blade ter-
minals pointing down. For all CE device installations
the subbase must be mounted inside of an approved
electrical cabinet where access is restricted.
2. When mounting in an electrical enclosure, provide
adequate clearance for service, installation and
removal of the RM7838B,C, KDM, flame amplifier,
flame amplifier signal voltage probes, electrical
signal voltage probes, and electrical connections.
a. Allow an additional 2 in. (51 mm) below the
RM7838B,C for the flame amplifier mounting.
b. Allow an optional 3 in. (76 mm) minimum to both
sides of the RM7838B,C for electrical signal volt-
age probes.
3. Make sure no subbase wiring is projecting beyond
the terminal blocks. Tuck in wiring against the back
of the subbase so it does not interfere with the knife
blade terminals or bifurcated contacts.
IMPORTANT
Install the RM7838B,C with a plug-in motion
rather than a hinge action.
4. Mount the RM7838B,C by aligning the four L-
shaped corner guides and knife blade terminals with
the bifurcated contacts on the wiring subbase and
securely tightening the two screws without
deforming the plastic.
G
12
L2
13
314
415
5
16
6
17
718
819
920
10
21
F
22
ALARM
COMBUSTION BLOWER
RECIRCULATING
BLOWER AFS
COMBUSTION BLOWER AFS
INTERMITTENT/10 SECOND
INTERRUPTED PILOT/
IGNITION
5 SECOND IGNITION
MAIN FUEL VALVE(S)
F
–
+
–
+
HIGH FIRE
COMMON
MODULATE
LOW FIRE
LOW FIRE START SWITCH
HIGH PURGE RATE SWITCH
PREIGNITION INTERLOCK
FLAME DETECTOR
1
120 VAC, 50/60 HZ POWER SUPPLY. PROVIDE DISCONNECT MEANS AND OVERLOAD PROTECTION AS REQUIRED.
SEE FLAME DETECTOR INSTRUCTIONS FOR CORRECT WIRING.
Q7800
2
START
2
STOP
L1
L2
1
RECIRCULATING
BLOWER
M29090
BURNER
CONTROL
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