19
CONNECTIONS
EWPlus 971 TERMINALS
Compressor relay
Defrost relay
N-L
Power Supply (115V
a
or 230V
a
)
A
TTL input
EWPlus 974 TERMINALS
Compressor relay
Defrost relay
Fans relay
N-L
Power Supply (115V
a
or 230V
a
)
A
TTL input
EWPlus 974
EWPlus 971
N
L
2 3
6 7
8 9 10
D
.I.
Pb1
4 5
11
Pb2
(A)
(B)
(evaporator)
(thermostat)
A
TTL
EW
PLUS
971
Power Supply
4VA max
1
N
L
2 3
6 7
8 9 10
(C)
D
.I.
Pb1
4 5
11
Pb2
(A)
(B)
(evaporator)
(thermostat)
A
TTL
EW
PLUS
974
Power Supply
4VA max