Mounting Rm7838B,C Relay Module - Honeywell 7800 Series Installation Instructions Manual

BURNER
CONTROL
1
L1
L2
120 VAC, 50/60 HZ POWER SUPPLY. PROVIDE DISCONNECT MEANS AND OVERLOAD PROTECTION AS REQUIRED.
1
2
SEE FLAME DETECTOR INSTRUCTIONS FOR CORRECT WIRING.
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.
RECIRCULATING
BLOWER
ALARM
COMBUSTION BLOWER
RECIRCULATING
BLOWER AFS
COMBUSTION BLOWER AFS
INTERMITTENT/10 SECOND
INTERRUPTED PILOT/
IGNITION
MAIN FUEL VALVE(S)
5 SECOND IGNITION
FLAME DETECTOR
2
Fig. 6. Wiring subbase for RM7838C1020/RM7838C2020.
15
RM7838B,C 7800 SERIES RELAY MODULE
Q7800
12
G
13
L2
3 14
4 15
5 16
STOP
6 17
7 18
8 19
9 20
10
21
F 22
START
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.
HIGH FIRE
F
COMMON
– –
MODULATE
+ +
LOW FIRE
LOW FIRE START SWITCH
HIGH PURGE RATE SWITCH
PREIGNITION INTERLOCK
M29090
32-00199—01