Eliwell EWPlus 974 - Ewplus 971; Ewplus 974

19
CONNECTIONS
EWPlus 971 TERMINALS
Compressor relay
Defrost relay
N-L Power Supply (115Va or 230Va)
A TTL input
EWPlus 974 TERMINALS
Compressor relay
Defrost relay
Fans relay
N-L Power Supply (115Va or 230Va)
A TTL input
EWPlus 974EWPlus 971
N
L
2 3 6 7 8 9
10
D.I.
Pb1
4 5 11
Pb2
(A) (B)
(evaporator)
(thermostat)
A
TTL
E
W
PLU
S
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
E
W
PLU
S
974
Power Supply
4VA max