Install Instructions

25 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
L2
9
8
3
7
M2527B
A
6
F
1ST STAGE
FUEL VALVE
2ND STAGE
FUEL VALVE
(OPTIONAL)
10
IGNITION
TRANSFORMER
FOR DIRECT SPARK IGNITION 
(OIL OR GAS)
21
9
L2
GENERAL FOOTNOTES, SEE PAGE 5.
A
B
C
D
D
C
1234
5
78
15
B
5
7800 SERIES CONVERSION WIRING DIAGRAM
FROM________________________________ TO ______________________
(DEVICE TO BE MODERNIZED) (O.S. NUMBER OF RELAY MODULE TO BE USED)
L1&4
R4150G1012, G1079 RM7840M1017, OR RM7800M1011
INSTALL JUMPER BETWEEN Q7800
SUBBASE TERMINALS 4 AND 13.

IF LOW FIRE SWITCH IS NOT USED,
JUMPER Q7800 SUBBASE TERMINAL 5 TO
18. NOTE: THIS WILL EXTEND PREPURGE
30 SECONDS.
LOCATE THIS JUNCTION
OR TERMINAL 16 
AND CONNECT IT TO
Q7800 SUBBASE
TERMINAL 6

LOCATE THE START INTERLOCKS AT THIS POINT AND 
CONNECT IT TO Q7800 SUBBASE TERMINAL 20. 
START INTERLOCKS NOW BECOME PREIGNITION 
INTERLOCKS. IF START INTERLOCKS ARE NOT USED,
JUMPER Q7800 TERMINALS 4 TO 20.
LIMITS
CONTROLLER
START
INTERLOCKS
AIRFLOW
SWITCH
L1
3
4
11
13
10