Honeywell 7800 SERIES Installation Instructions Manual page 3

BURNER
CONTROL
4
CONFIGURATION
JUMPERS
RESET
PUSHBUTTON
STATUS LEDs
6
RUNNING/
LOCKOUT
INTERLOCK
LIMITS
HIGH FIRE SWITCH
19
3K1
KEYBOARD
DDL DISPLAY MODULE
RS485
1
DDL
2
3
COMMUNICATIONS
1 PROVIDE DISCONNECT MEANS AND OVERLOAD PROTECTION AS REQUIRED
2 S7800 INCLUDED WITH RM7838A.
COMBUSTION BLOWER OR EXHAUST RECIRCULATING FANS.
3
Fig. 1. Internal block diagram of the RM7838A (see Fig. 2 for detailed wiring instructions).
L1 L2
1
(HOT)
120 Vac
50/60 Hz
FAN
3
FLAME SIGNAL
MICROCOMPUTER
2K
3K
4K
RELAY
5K
DRIVE
CIRCUIT 6K
7K
8K
9K
SAFETY RELAY
1K
CIRCUIT
POWER SUPPLY
1K1
1K1
2K1 5K1
7
7K1
2K2
2
5
REMOTE
RESET
3
RM7838A 7800 SERIES RELAY MODULES
PLUG-IN PURGE
TIMER CARD
TEST
JACK
F
PLUG-IN
G
FLAME
AMPLIFIER
TEST
22
RELAY
STATUS
FEEDBACK
AND LINE
VOLTAGE
INPUTS
CONTROL
POWER
8
PILOT
S445A
LOW FIRE
START
SWITCH
10
C D
IGNITION
21 A
B
STOP
9 MAIN VALVE(S)
3 ALARM
ALARM
SILENCING
RELAY (DPST)
INDICATES FEEDBACK SENSING
OF RELAY CONTACT STATUS
AND LINE VOLT INPUTS
FIELD WIRING
INTERNAL WIRING
L2
M5120C
66-1087—2