Honeywell rm7890a - Page 8

RM7890A,B,C/EC7890A,B 7800 SERIES RELAY MODULES
66-1089—11 8
Fig. 2. Wiring subbase and operating sequence chart for RM/EC7890.
M23305C
G
L2
3
5
6
7
8
9
10
F
(L1)
13
14
15
16
17
18
19
20
21
22
12
IGNITION
BURNER
CONTROLLER/LIMITS
LINE VOLTAGE
ALARM
INTERMITTENT
PILOT/IGNITION
FLAME DETECTOR
120V, 50/60 HZ (RM7890) 220-240, 50/60 HZ (EC7890) POWER
SUPPLY. PROVIDE DISCONNECT MEANS AND OVERLOAD
PROTECTION AS REQUIRED.
INSTALL A LINE VOLTAGE CONTROLLER IN SERIES WITH THE
LIMITS. IF USING A LOW VOLTAGE CONTROLLER IS
DESIRABLE, INSTALL AN EXTERNAL RELAY WITH THE N.O.
CONTACTS IN SERIES WITH THE LIMITS. THE LOW VOLTAGE
RELAY COIL WILL BE IN THE LOW VOLTAGE CONTROLLER
CIRCUIT. NOTE THAT IT MAY BE NECESSARY TO PROVIDE
AN EXTERNAL LOW VOLTAGE TRANSFORMER.
DO NOT CONNECT ANY WIRES TO UNUSED TERMINALS.
TERMINAL 22 IS ONLY ON THE RM/EC7890B.
FOR CONTINIOUS OR STANDING PILOT, USE THE RM7890C.
WHEN USING RM/EC7890A OR B; INSTALL AN EXTERNAL
RELAY TO SWITCH THE F LEAD. THE RELAY MUST HAVE
GOLD-CLAD OR GOLD-FLASH CONTACTS AND A LINE
VOLTAGE COIL. POWER THE RELAY COIL FROM THE Q7800
SUBBASE TERMINAL 8. CONNECT THE RELAY CONTACTS
BETWEEN THE F LEAD OF THE DETECTOR AND THE F
TERMINAL OF THE Q7800 SUBBASE. THE R4222N1002 OR
R4222V1002 RELAY IS ACCEPTABLE TO USE IN THIS TYPE OF
APPLICATION. USE THE N.O. PILOT DUTY CONTACTS.
MASTER
SWITCH
L1
(HOT)
L2
Q7800
4
POWER
00
LED
DISPLAY
OPERATING
CONTROLLER
AND LIMITS
BURNER
START
FLAME
SIGNAL
INITIATE
ALARM
POWER
STANDBY
POWER POWER
PILOT
FLAME
MAIN
PFEP
4 OR 10 SEC
PILOT
FLAME
MAIN
POWER
RUN
STANDBY
4/10
IGNITION
INTERMITTENT PILOT
MAIN VALVE
LIMITS AND BURNER CONTROL CLOSED
9
8
10
3
6
TO
00
POWER
SAFE-
START
ALARM
S S C
SAFE START CHECK
FLAME PROVING
1
2
5
1
3
4
5
2
7
MAIN FUEL
VALVE(S)
3
4
USING EC7890, A 220-240 VAC TO 120 VAC, 10 VA MINIMUM
STEP-DOWN TRANSFORMER (NOT PROVIDED) MUST BE
USED TO DRIVE THE SHUTTER (C7012E,F; C7061; C7076A,D
DETECTORS).
SEE FLAME DETECTOR SPECIFICATION FOR CORRECT WIRING.
RM7890A1031 PFEP IS 30 SECONDS FIXED. RM7890B1030 PFEP IS
10 SECONDS FIXED.
MAIN FUEL VALVE IS ENERGIZED AND IGNITION (TERMINAL 10) IS
TURNED OFF DURING PFEP ONCE FLAME IS PROVEN.
POWER
PILOT
FLAME
MAIN
ALARM
MFEP
20
6
6
FOR DIRECT SPART IGNITION
(OIL OR GAS)
8
9
10
IGNITION
TRANSFORMER
MAIN VALVE
L2
9
9
7
8
9
EXCEPTIONS:
RM7890A1031 HAS A FIXED 30 SECOND PFEP
RM7890B1030 HAS A FIXED 10 SECOND PFEP
RM7890A1064, RM7890B1055 AND EC7890A1037
JR1 INTACT – 10 SECOND FIXED PFEP, IGNITION
(TERMINAL 10) SHUTS OFF AT 6 SECONDS.
JR1 CLIPPED – 4 RECONDS FIXED PFEP, IGNITION
(TERMINAL 10) SHUTS OFF AT 2 SECONDS.
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