Honeywell RM7838B Installation Instructions Manual page 3

4. See Table 1 for recommended wire size and type.
4
STATUS LED
DDL
COMMUNICATIONS
RECIRCULATING
AFS
LOCKOUT INTERLOCKS
AND COMBUSTION AIR
BLOWER SWITCHES
PILOT VALVE
HOLD SWITCH
LOW START
SWITCH
HIGH PURGE
RATE SWITCH
PREIGNITION
INTERLOCK
Fig. 1. Internal block diagram of RM7838B,C (see Fig. 2 for RM7838C1020); see Fig. 3 and 4 for detailed wiring
L1
BURNER CONTROL
(HOT)
CONFIGURATION
JUMPERS
RUN/TEST
SWITCH
RESET
PUSHBUTTON
SAFETY RELAY
CIRCUIT
KEYBOARD
DISPLAY MODULE
DDL
RS485
1
2
REMOTE
3
RESET
LIMITS
STOP SWITCH
1/2 OF DPST
ALARM SILENCING
SWITCH
16
17
MANUAL VALVE
OPEN SWITCH
18
19
20
START SWITCH
21
1
L2
120 Vac
50/60 HZ
RECIRCULATING
BLOWER
PLUG-IN PURGE
TIMER CARD
FLAME SIGNAL
MICROCOMPUTER
TEST
2K
3K
4K
RELAY
5K
DRIVE
CIRCUIT
7K
1K
POWER SUPPLY
6K1
1K1 2K1 5K1
4K1
2K2
6
3K1
7
2
INDICATES FEEDBACK SENSING
OF RELAY CONTACT STATUS
AND LINE VOLT INPUTS
FIELD WIRING
INTERNAL WIRING
1 PROVIDE DISCONNECT MEANS AND
OVERLOAD PROTECTION AS REQUIRED.
2
NOT REQUIRED FOR RM7838C.
instructions.
3
RM7838B,C 7800 SERIES RELAY MODULE
TEST
JACK
F
PLUG-IN
G
FLAME
AMPLIFIER
22
RELAY
STATUS
FEEDBACK
AND LINE
VOLTAGE
INPUTS
CONTROL
POWER
COMBUSTION
5
AIR BLOWER
10 IGNITION
8
PILOT
MAIN VALVE
9
3
ALARM
1/2 OF DPST
ALARM SILENCING
2
SWITCH
HIGH PURGE
8K1
COMMON
8K2
MODULATE
9K1
9K2
LOW FIRE
M5195D
L2
12
13
15
14
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