ST-3E
R1
B
R
O
W
G
C
ZONE1
T’STAT
Y
R
W
C
ZONE2
T’STAT
Y
Figure 7
THERMOSTAT TERMINALS (CONVENTIONAL)
SYSTEM
C
R
E/W1
W2
Y1
L
G
O
B
Single Stage (SS1)
24 Volt (Common)
24 Volt (Hot)
Heat Mode 1st stage
No Output
Compressor No Function
Malfunction
Blower/Fan Energized on call for Cool (and Heat
if HE was selected)
Energized in Cool Mode - Continuous
Energized in Heat Mode - Continuous
Multistage (MS2)
Heat Mode 2nd stage
R
W
G
C
COMPRESSOR
Y
GAS
FURNACE
E/W1
E
W
T
-3
7
0
7
C
R
W2
Y1
G
L
B
O
E/W1
E
W
T
-3
7
0
7
C
R
W2
Y1
G
L
B
O
E/W1
E
W
T
-3
7
0
7
C
R
W2
Y1
G
L
B
O
Y
C
R
W
G
C
COMPRESSOR
Y
GAS
FURNACE
E/W1
E
W
T
-3
7
0
7
C
R
W2
Y1
G
L
B
O
Y
C
W2
E/W1
E
W
T
-3
7
0
7
C
R
W2
Y1
G
L
B
O
Y
R
G
W/E
C
T
T
ISOLATION RELAY
Non-Zoned
Hydro
1H/1C
Non-Zoned
Gas or Oil
2H/1C
Non-Zoned
Gas
1H/1C
Figure 5
Figure 8
Figure 6
EWC Controls Inc. 385 Highway 33 Englishtown, NJ 07726 800-446-3110 FAX 732-446-5362 E-Mail- [email protected]
4
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