Install Instructions

65-0100—2 42
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
M2520B
A
6, 5
F
A
B
E
F
G
G
C
D
D
GENERAL FOOTNOTES, SEE PAGE 5.
1234
5 78
15
16
18
F
C
E
C
B
7800 SERIES CONVERSION WIRING DIAGRAM
FROM________________________________ TO ______________________
(DEVICE TO BE MODERNIZED) (O.S. NUMBER OF RELAY MODULE TO BE USED)
1 (L1) + 3
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
11
10
12
13
MAIN VALVE
10
IGNITION
TRANSFORMER
FOR DIRECT SPARK IGNITION 
(OIL OR GAS)
8
9
L2
5
A. R4181A1018 ONLY - IF Q477 OR Q514
SUBBASE TERMINAL 5 WAS USED, 15
SECOND MFEP WAS PROVIDED, AND
TERMINAL 6 PROVIDED 30 SECOND
MFEP. REPLACEMENT RM7840/RM7800
PROVIDE ONLY 10 OR 15 SECOND MFEP
. SELECT 15 SECOND PER SPECIFICATION
65-0087 FOR 7840 OR 65-0088
FOR RM7800.
B. R4181A1034 ONLY - IF Q477 OR Q514
SUBBASE TERMINAL 5 WAS USED, 10
SECOND MFEP WAS PROVIDED.
TERMINAL 6 WAS USED FOR 15
SECONDS. SELECT PROPER
CONFIGURATION JUMPER PER
SPECIFICATION 65-0087 FOR
RM7840 OR 65-0088 FOR RM7800.

REMOVE AND DISCARD ANY JUMPERS
BETWEEN Q477 OR Q514 SUBBASE
TERMINAL F TO 14 OR F TO 16.

RM7840L/RM7800L APPLICATIONS ONLY-
LOCATE Q477 OR Q514 SUBBASE
TERMINAL (L1) SIDE OF THE HIGH FIRE
SWITCH AND CONNECT TO Q7800
SUBBASE TERMINAL 5. NOTE : IF HIGH
FIRESWITCH IS NOT USED, INSTALL A
JUMPER. PREPURGE TIMING IS EXTENDED
30 SECONDS.

LOCATE LOW FIRE SWITCH WIRE
CONNECTED TO Q477 OR Q514 SUBBASE
TERMINAL 17 AND CONNECT TO Q7800
SUBBASE TERMINAL 5. IF LOWFIRE
SWITCH IS NOT USED, INSTALL A JUMPER.
NOTE: PREPURGE TIMING IS EXTENDED 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.
R4181A1018, A1034
RM7840E1016 OR RM7800E1010
RM7840L1018 OR RM7800L1012
16
17
18