Fig. 7-Internal Block Diagram Of The Rm7838B - Honeywell 7800 Series Manual

Fig. 7—Internal block diagram of the RM7838B (See Figs. 8 or 9 for detailed wiring instructions).
4
RUN/TEST
SWITCH
RESET
PUSHBUTTON
STATUS LEDs
DDL
DDL
COMMUNICATIONS
RECIRCULATING
A F S
COMBUSTION
AIR BLOWER
SWITCH
PILOT VALVE
HOLD SWITCH
MANUAL VALVE
OPEN SWITCH
LOW START
SWITCH
HIGH PURGE
RATE SWITCH
PREIGNITION
INTERLOCK
START SWITCH
L1
BURNER CONTROL
(HOT)
RECIRCULATING
BLOWER
CONFIGURATION
JUMPERS
MICROCOMPUTER
RELAY
DRIVE
CIRCUIT
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
INDICATES FEEDBACK SENSING
17
TO RELAY STATUS FEEDBACK
AND LINE VOLT INPUTS
FIELD WIRING
18
INTERNAL WIRING
19
20
1 PROVIDE DISCONNECT MEANS AND OVERLOAD
21
PROTECTION AS REQUIRED.
13
1
L2
120 Vac
PLUG-IN PURGE
TIMER CARD
FLAME SIGNAL
PLUG-IN
FLAME
AMPLIFIER
TEST
2K
3K
4K
5K
RELAY
STATUS
7K
FEEDBACK
AND LINE
VOLTAGE
INPUTS
1K
CONTROL
POWER SUPPLY
POWER
6K1
5
1K1 2K1 5K1
10
4K1
8
2K2
9
3K1
3
1/2 OF DPST
ALARM SILENCING
SWITCH
INSTALLATION
L2
TEST
JACK
F
G
22
COMBUSTION
AIR BLOWER
IGNITION
PILOT
MAIN VALVE
ALARM
HIGH PURGE
12
8K1
COMMON
13
8K2
MODULATE
15
9K1
9K2
LOW FIRE
14
M5195A
65-0120—1
RM7838B