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3
CONFIGURATION
1
JUMPERS
MICROCOMPUTER
RESET
PUSH-
BUTTON
SAFETY RELAY
CIRCUIT
STATUS LEDs
LIMITS
CONTROLLER
6
3K1
OPTIONAL KEYBOARD
DISPLAY MODULE
RS485
DDL
1
DDL
2
REMOTE
3
COMMUNICATIONS
RESET
L1
L2
(HOT)
2
FLAME SIGNAL
PLUG-IN
FLAME
TEST
AMPLIFIER
RELAY
2K
DRIVE
RELAY
CIRCUIT
3K
STATUS
4K
FEEDBACK
AND LINE
VOLTAGE
INPUTS
1K
POWER SUPPLY
1K1
2K2
5K1
4K1
2K1
INDICATES FEEDBACK SENSING
TO RELAY STATUS FEEDBACK
AND LINE VOLT INPUTS
FIELD WIRING
INTERNAL WIRING
Fig. 1. Internal block diagram of the RM/EC7890.
7
RM7890A,B,C/EC7890A,B 7800 SERIES RELAY MODULES
L2
RM7890C
TEST
JACK
F
N. O.
G
22
3
1
NUMBERS IN CIRCLES ARE RELAY MODULE
TERMINAL NUMBERS.
CONTROL
2
PROVIDE DISCONNECT MEANS AND
POWER
OVERLOAD PROTECTION AS REQUIRED.
120 VAC, 50/60 HZ (RM7890); 220-240 VAC,
IGNITION
10
50/60 HZ (EC7890) POWER SUPPLY.
8
PILOT
3
EC7890 REQUIRES A 220/240 VAC TO 120 VAC,
10VA, STEPDOWN TRANSFORMER (NOT
9
MAIN VALVE
SUPPLIED) WHEN USING C7012E, F; C7061A,
AND C7076A FLAME DETECTORS.
4
ALARM
F
M11586A
66-1089—11
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