Honeywell RM7838A Wiring Diagrams page 5

7800 SERIES CONVERSION WIRING DIAGRAM
FROM
R4138A, B, C, D
(DEVICE TO BE MODERNIZED)
Q7800
G
G
2
L2
L2
C 3
E 4 (L1)
5
D
7, 17 6
7
F
8
19
20
9
6
10
F
F
1 2
3 4 5
GENERAL FOOTNOTES, SEE PAGE 4.
A R4138B,D DEVICES PROVIDED CIRCUITRY TO
WITHSTAND UP TO A ONE SECOND POWER
INTERRUPTION WITHOUT SYSTEM SHUTDOWN.
THE REPLACEMENT 7800 SERIES CONTROL WILL
RETURN TO INITIATE AND THE SYSTEM WILL NEED
TO BE RESTARTED BEGINNING WITH PURGE.
B DISREGARD R4138 SUBBASE JUMPERS (IF USED);
13–14, 12–F, AND L1–6. THESE JUMPERS ARE NOT
REQUIRED FOR THE RM7838 CONTROL.
TO
12
8
B
13
14
15
16
17
18
18
19
20
21 8
22 12
7 9
8 10
6
5
A
RM7838A
(O.S. NUMBER OF RELAY MODULE TO BE USED)
C IF THE R4138 HAS AN ALARM SILENCING
RELAY, CONNECT THE R4138 SUBBASE
TERMINAL 15 TO Q7800 TERMINAL 3.
LOCATE L1 CONNECTION TO ALARM
SILENCING RELAY AND WIRE NUT THIS
LEADWIRTE WITH THE ALARM LEADWIRE
THAT IS CONNECTED TO THE R4138
SUBBASE TERMINAL 16.
IF THERE IS NO SILENCING RELAY,
CONNECT THE R4138 SUBBASE TERMINAL
16 TO THE Q7800 SUBBASE TERMINAL 3
AND IGNORE THE JUMPER FROM THE
R4138 SUBBASE TERMINALS 11–15.
IF A JUMPER WAS INSTALLED BETWEEN
D
THE R4138 SUBBASE TERMINALS 7–13,
REMOVE AND DISCARD THIS JUMPER.
E THE R4138 SUBBASE TERMINAL L1 WAS
POWERED FROM THE MASTER SWITCH
THROUGH LIMITS AND RUNNING
INTERLOCKS. THE RM7838 SUBBASE L1
TERMINAL (4) MUST BE POWERED
DIRECTLY FROM THE MASTER SWITCH.
CONNECT THE SERIES STRING OF THE
F
BURNER SWITCH, LIMITS AND RUNNING
INTERLOCKS (IF USED) BETWEEN THE
MASTER SWITCH AND TERMINAL 7.
M3307
65-0129