Install Instructions

43 65-0100—2
12
Q7800
13
14
15
16
18
17
19
20
21
22
G
L2
9
8
7
6
5
4
3
10
F
G
2, L2
9
8
15
7
M2519B
6
F
GENERAL FOOTNOTES, SEE PAGE 5.
A
A
B
E
F
D
F
1234
5
78
15
16
18
E
C
C
D
B
B
7800 SERIES CONVERSION WIRING DIAGRAM
FROM________________________________ TO ______________________
(DEVICE TO BE MODERNIZED) (O.S. NUMBER OF RELAY MODULE TO BE USED)
1, L1 11
10
13
MAIN VALVE
10
IGNITION
TRANSFORMER
FOR DIRECT SPARK IGNITION 
(OIL OR GAS)
8
9
L2
5
16
17
18
R4181 HAD 10 SECOND EARLY SPARK TERMINATION;
REPLACEMENT RM7840/RM7800 HAS 5 SECONDS.

LOCATE PREIGNITION INTERLOCKS ON Q514 OR Q477
SUBBASE TERMINALS 3 AND 4. CONNECT ONE 
LEADWIRE TO Q7800 SUBBASE TERMINAL 4 AND THE
OTHER TO Q7800 SUBBASE TERMINAL 20. IF 
PREIGNITION INTERLOCK IS NOT USED, JUMPER Q7800
TERMINALS 4 TO 20.
A. TO USE EXISTING GROUNDED MODULATING
CIRCUIT, JUMPER Q7800 TERMINALS
13 AND G.
B. IF AN ISOLATED MODULATING CIRCUIT IS
DESIRED, IDENTIFY THE WIRE CONNECTED
BETWEEN THE MODULATING MOTOR
TERMINAL R AND Q477 OR Q514 TERMINAL G.
DISCONNECT THE WIRE AND CONNECT TO
Q7800 SUBBASE TERMINAL 13.

RM7840E, RM7800E ONLY: LOCATE HIGH FIRE
SWITCH CONNECTED TO Q477 OR Q514
TERMINAL 8 AND CONNECT TO Q7800 SUBBASE
TERMINAL 4. IF HIGH FIRE SWITCH IS NOT USED,
A JUMPER IS REQUIRED BETWEEN Q7800
SUBBASE TERMINAL 4 AND 19. NOTE: THIS
ADDS 30 SECONDS TO THE PREPURGE
TIMING.

LOCATE THE LOW FIRE SWITCH CONNECTION
ON Q477 OR Q514 SUBBASE TERMINAL 17 AND
CONNECT TO THE Q7800 SUBBASE TERMINAL 5.
NOTE: IF LOW FIRE SWITCH IS NOT USED,
JUMPER Q7800 SUBBASE TERMINAL 5 TO 18.
30 SECONDS WILL BE ADDED TO THE PREPURGE
TIMING.

REMOVE AND DISCARD JUMPER FROM Q477 OR
Q514 SUBBASE TERMINAL F TO 14 OR F TO 16.
3,4
12
R4181A1042, A1059
RM7840E1016 OR RM7800E1010
RM7840L1018 OR RM7800L1012