Install Instructions

41 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) + 15
9
8
4
7
M2521B
A
5,6
MAIN VALVE
10
IGNITION
TRANSFORMER
FOR DIRECT SPARK IGNITION 
(OIL OR GAS)
8
9
L2
GENERAL FOOTNOTES, SEE PAGE 5.
A
B
1234
5
7815
18
16
B
F
E
C
7800 SERIES CONVERSION WIRING DIAGRAM
FROM________________________________ TO ______________________
(DEVICE TO BE MODERNIZED) (O.S. NUMBER OF RELAY MODULE TO BE USED)
1 (L1) + 3
R4181A1000, A1026
RM7840E1016 OR RM7800E1010
RM7840L1018 OR RM7800L1012
C
E
F
G
G
D
D
R4181A, TERMINAL 6, PROVIDES 30
SECOND MFEP. REPLACEMENT
RM7840/RM7800 PROVIDES 15 
SECONDS ONLY.

REMOVE AND DISCARD ANY JUMPERS 
BETWEEM Q477 OR Q514 SUBBASE
TERMINALS F TO 14 OR F TO 16.

RM7840L/RM7800L ONLY – LOCATE LOW
FIRE SWITCH CONNECTED TO Q477 OR
Q514 SUBBASE TERMINAL 1(L1) AND
CONNECT TO Q7800 SUBBASE TERMINAL 5.
IF LOWFIRE SWITCH IS NOT USED,
CONNECT A JUMPER FROM TERMINAL 18
TO 5. NOTE: THIS JUMPER WILL EXTEND
PREPURGE TIME BY 30 SECONDS.

RM7840L/RM7800L – CONNECT JUMPER
BETWEEN Q7800 SUBBASE TERMINALS 5
AND 19. NOTE: THIS WILL EXTEND
PREPURGE TIME BY 30 SECONDS.
RM7840E/RM7800E – CONNECT JUMPER
BETWEEN Q7800 SUBBASE TERMINALS 4
AND 19. NOTE: THIS JUMPER WILL
EXTEND PREPURGE TIME BY 30
SECONDS.

NOTE: R4181 TERMINAL 16 MAY HAVE 
BEEN USED FOR THE FLAME DETECTOR.
IF R4181 TERMINAL 16 IS NOT CONNECTED 
TO R4181 TERMINAL F, CONNECT R4181 
TERMINAL 16 TO Q7800 TERMINAL 22.
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
18
16
11
10
12
13
17
F
For Insurance Requirements