7800 SERIES EC7890A,B/RM7890A,B RELAY MODULE
65-0204–1
13
Fig. 8. Wiring the EC7890A,B.
M11300
G
L2
3
5
6
7
8
9
10
F
(L1)
13
14
15
16
17
18
19
20
21
22
12
MASTER
SWITCH
IGNITION
MAIN FUEL
VALVE(S)
BURNER
CONTROLLER/LIMITS
200 VAC
ALARM
INTERMITTENT
PILOT/IGNITION
RECTIFYING FLAME
ROD, RECTIFYING
PHOTOCELL, OR INFRA-
RED (LEAD SULFIDE)
FLAME DETECTOR
C7027A, C7035A, OR
C7044A ULTRAVIOLET
FLAME DETECTOR
C7012A,C,E,F OR
C7076A ULTRAVIOLET
FLAME DETECTOR
200V, 50/60 HZ (EC7890) POWER SUPPLY. PROVIDE DISCONNECT
MEANS AND OVERLOAD PROTECTION AS REQUIRED.
DO NOT CONNECT ANY WIRES TO UNUSED TERMINALS.
TERMINAL 22 IS ONLY ON THE EC7890B.
FOR DIRECT SPARK IGNITION (OIL
OR GAS)
L1
(HOT)
L2
1
OR
OR
BLUE
BLUE
BLUE
WHITE
YELLOW
YELLOW
YELLOW
WHITE
WHITE
WHITE
WHITE
BLACK
BLACK
BLACK
BLACK
9
8
10
IGNITION
TRANSFORMER
MAIN VALVE
1
Q7800
2
2
3
3
5
4
L2
FOR A CONTINUOUS OR STANDING PILOT, INSTALL AN EXTERNAL RELAY TO
SWITCH THE F LEAD. THE RELAY MUST HAVE GOLD-CLAD OR GOLD-FLASH
CONTACTS AND A 230 VAC 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 RELAY IS ACCEPTABLE TO USE IN THIS TYPE OF APPLICATION.
USE THE N.O. PILOT DUTY CONTACTS.
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.
USE 2:1 STEP DOWN POWER TRANSFORMER, 300 VA MINIMUM (STANCOR P8620
OR EQUIVALENT). FOR C7012E,F; C7061A; C7076A,C FLAME DETECTORS ONLY.
4
5
6
6
4
C7012A,C ULTRAVIOLET
FLAME DETECTOR
BLUE
C7061A
1:2
