Install Instructions

37 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&15
4
7
M2516B
A
5 0R 6
F1
GENERAL FOOTNOTES, SEE PAGE 5.
A
B
F
E
1234
5 7815
18
B
D
C
B
D
7800 SERIES CONVERSION WIRING DIAGRAM
FROM________________________________ TO ______________________
(DEVICE TO BE MODERNIZED) (O.S. NUMBER OF RELAY MODULE TO BE USED)
L1&3
R4127A1056, A1080, A1122, A1148
A1155, A1171, A1197, B1039, B1054
RM7840G1014 OR RM7800G1018
C
E
F
D
R4127 PROVIDED 10 SECOND IGNITION-
REPLACEMENT. RM7840/RM7800
PROVIDES 5 SECONDS

IF LOW FIRE SWITCH IS NOT USED,
JUMPER Q7800 SUBBASE TERMINALS 5
AND 18. NOTE: THIS WILL ADD 30 SECONDS
TO THE PREPURGE TIMING.

Q535 OR Q536 TERMINAL 5 PROVIDED 15
SECOND MFEP. Q535 OR Q536 TERMINAL 6 
PROVIDED EITHER 30, 55, OR 60 SECOND 
MFEP (DEPENDS ON R4127 MODEL). JUMPER
RM7840G/RM7800G TERMINAL 19 TO 5 TO
GET 30 SECOND MFEP. 55 AND 60 SECOND
MFEP IS NOT ATTAINABLE. 

Q535 OR Q536 SUBBASE HAD U1 AND U2
TERMINALS THAT WERE USED FOR
C7020 AND C7012E,F FLAME DETECTORS.
A. TO MODERNIZE C7020 APPLICATIONS,
CHOOSE A NEW DECTOR AND
REWIRE PER RM7840/RM7800
SPECIFICATIONS.
B. TO MODERNIZE A C7012E,F
APPLICATION, USE THE EXISTING
SENSOR AND REWIRE PER 
RM7840/RM7800 SPECIFICATIONS.
LOCATE THIS JUNCTION 
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
16
12
13
14
11 IF USED
1ST STAGE
FUEL VALVE
2ND STAGE
FUEL VALVE
(OPTIONAL)
10
IGNITION
TRANSFORMER
FOR DIRECT SPARK IGNITION 
(OIL OR GAS)
21
9
L2
15