Honeywell 7800 Series Installation Instructions Manual page 5

4
RESET
PUSHBUTTON
STATUS LED
DDL
DDL
COMMUNICATIONS
RECIRCULATING
AFS
LOCKOUT INTERLOCKS
AND COMBUSTION AIR
BLOWER SWITCHES
PILOT VALVE
HOLD SWITCH
MANUAL VALVE
OPEN SWITCH
LOW START
SWITCH
HIGH PURGE
RATE SWITCH
PREIGNITION
INTERLOCK
Fig. 2. Internal block diagram of RM7838B,C (see Fig. 3 for RM7838C1020/RM7838C2020); see Fig. 4 and 5 for
L1
BURNER CONTROL
(HOT)
CONFIGURATION
JUMPERS
RUN/TEST
SWITCH
MICROCOMPUTER
SAFETY RELAY
CIRCUIT
KEYBOARD
DISPLAY MODULE
RS485
1
2
REMOTE
3
RESET
LIMITS
6
STOP SWITCH
7
1/2 OF DPST
ALARM SILENCING
SWITCH
16
17
18
19
20
START SWITCH
21
detailed wiring instructions.
RM7838B,C 7800 SERIES RELAY MODULE
1
L2
120 Vac
50/60 HZ
RECIRCULATING
BLOWER
PLUG-IN PURGE
TIMER CARD
FLAME SIGNAL
PLUG-IN
FLAME
AMPLIFIER
TEST
2K
3K
4K
RELAY
5K
DRIVE
CIRCUIT
7K
1K
POWER SUPPLY
6K1
5
1K1 2K1 5K1
10
4K1
8
2K2
9
3K1
3
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.
5
L2
TEST
JACK
F
G
22
RELAY
STATUS
FEEDBACK
AND LINE
VOLTAGE
INPUTS
CONTROL
POWER
COMBUSTION
AIR BLOWER
IGNITION
PILOT
MAIN VALVE
ALARM
1/2 OF DPST
ALARM SILENCING
2
SWITCH
HIGH PURGE
12
8K1
COMMON
13
8K2
MODULATE
15
9K1
9K2
LOW FIRE
14
M5195D
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