Advertisement
5
RUN/TEST
SWITCH
RESET
PUSHBUTTON
STATUS
LEDS
ES1
ES2
16
LOS
3K2
2
6K1
3K1
OPTIONAL KEYBOARD
DISPLAY MODULE
DDL
RS485
1
DDL
2
COMMUNICATIONS
3
1
PROVIDE DISCONNECT MEANS AND OVERLOAD PROTECTION
AS REQUIRED.
2
TO CONNECT L1 DIRECTLY TO LOS, AT LEAST ONE CONTROLLED
SHUTDOWN MUST BE PROVIDED EVERY 24 HOURS.
Fig. 1. Internal block diagram of EC7820A Relay Module (see Fig. 2 for detailed wiring instructions).
L1
HOT N
1
220-240 Vac,
50/60 Hz
CONFIGURATION
JUMPERS
MICROCOMPUTER
2K
3K
4K
RELAY
DRIVE
5K
CIRCUIT
6K
7K
9K
SAFETY RELAY
1K
CIRCUIT
POWER SUPPLY
18
17
RT
20
6
LD2
1K1
7
9K1
5
REMOTE
RESET
7
EC7820A 7800 SERIES RELAY MODULES
PLUG-IN PURGE
TIMER CARD
FLAME SIGNAL
PLUG-IN
FLAME
AMPLIFIER
RELAY
STATUS
FEEDBACK
AND LINE
VOLTAGE
INPUTS
CONTROL
POWER
AL
2K1 5K1
10
4K1
8
7K1
21
2K2
9
4
3
13
INDICATES FEEDBACK SENSING
TO RELAY STATUS FEEDBACK
AND LINE VOLTAGE INPUTS
14
USER TERMINALS
F
G ... 22
RELAY CONTACT OPEN
RELAY CONTACT CLOSED
RELAY COIL
FIELD WIRING
INTERNAL WIRING
2
TEST
JACK
F
G
SHUTTER
22
IGN
PV1
PV2
MV
FAN
AL
M8032C
66-1091—08
Advertisement
