Honeywell 7800 Series Manual page 10

RM7885A
INSTALLATION
Fig. 6—RM7885A Internal block diagram. (See Fig. 7 for detailed wiring instructions.)
DDL
COMMUNICATIONS
L1
(HOT)
3
RESET
PUSHBUTTON
SAFETY RELAY
CIRCUIT
STATUS LEDs
6
LIMITS
3K1
OPTIONAL KEYBOARD
DDL
DISPLAY MODULE
RS485
1
2
3
REMOTE
RESET
PROVIDE DISCONNECT MEANS AND OVERLOAD PROTECTION AS REQUIRED.
1
1
L2
120 Vac
FLAME SIGNAL
MICROCOMPUTER
TEST
2K
RELAY
3K
DRIVE
CIRCUIT
4K
5K
1K
POWER SUPPLY
4K1
8
1K1
2K1
10
2K2
9
4
10
L2
TEST
JACK
F
PLUG-IN
G
FLAME
AMPLIFIER
22
RELAY
STATUS
FEEDBACK
AND LINE
VOLTAGE
INPUTS
CONTROL
POWER
PILOT
S445A
START
IGNITION
C D
˚
A B
STOP
MAIN VALVE(S)
R4155A
4 5 6 2
ALARM
INDICATES FEEDBACK SENSING
TO RELAY STATUS FEEDBACK
AND LINE VOLT INPUTS
FIELD WIRING
INTERNAL WIRING
M5133A