Install Instructions

35 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
F2
7
M2515B
6
GENERAL FOOTNOTES, SEE PAGE 5.
B
A
A
B
1234
578
15
18
E
E
F
F
G
G
D
C
C
D
F
7800 SERIES CONVERSION WIRING DIAGRAM
FROM________________________________ TO ______________________
(DEVICE TO BE MODERNIZED) (O.S. NUMBER OF RELAY MODULE TO BE USED)
L1 12
13
11
MAIN VALVE
10
IGNITION
TRANSFORMER
FOR DIRECT SPARK IGNITION 
(OIL OR GAS)
8
9
L2
5
15
16
3&4
14
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 DETECTION AND 
REWIRE PER RM7840/RM7800 
SPECIFICATIONS. 
B. TO MODERNIZE A C7012E,F
APPLICATION, USE THE EXISTING
SENSOR AND REWIRE PER 
RM7840/RM7800 SPECIFICATIONS.
R4126A1172,A1180, A1198 HAD 30 SECOND MFEP
ON TERMINAL 6. REPLACEMENT RM7840/RM7800
PROVIDE 15 SECOND MFEP ONLY.

R4126 PROVIDED 10 SECOND IGNITION TIMING.
REPLACEMENT RM7840/RM7800 PROVIDES
5 SECONDS.
LOCATE LOW FIRE SWITCH WIRE ON Q535 
OR Q536 SUBBASE TERMINAL 15 AND 
CONNECT TO Q7800 SUBBASE TERMINAL 5.

FOR RM7840E/RM7800E APPLICATION 
ONLY. LOCATE HIGH FIRE SWITCH WIRE 
ON Q535 OR Q536 SUBBASE TERMINAL 8
AND CONNECT TO Q7800 SUBBASE 
TERMINAL 4.



LOCATE PREIGNITION INTERLOCK WIRE 
ON Q535 OR Q536 TERMINALS 3 AND 4. 
CONNECT PREIGNITION INTERLOCK 
BETWEEN Q7800 SUBBASE TERMINALS 4 
AND 20. IF PREIGNITION INTERLOCK WAS 
NOT USED, INSTALL JUMPER.
A. TO USE EXISTING GROUNDED MODULATING
CIRCUIT, JUMPER Q7800 TERMINALS 
13 AND G.
B. IF A NONGROUNDED MODULATING CIRCUIT
IS DESIRED, IDENTIFY WIRE FROM MOD
MOTOR TERMINAL R AND Q535 OR Q536
TERMINAL G. DISCONNECT WIRE AND
CONNECT TO Q7800 SUBBASE TERMINAL 13.
R4126A1172, A1180, A1198
RM7840E1016 OR RM7800E1010
RM7840L1018 OR RM7800L1012