HydroTherm EW2-1203, Installation, Operation & Maintanance Manual

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T2: 24V TRANSF.
TH1: ZONE T'STAT
TH2: ZONE T'STAT
TH3: ZONE T'STAT ZV1: ZONE VALVE
ZV2: ZONE VALVE
ZV3: ZONE VALVE R1: AQUASTAT RELAY - L8148E
GV: GAS VALVE
TH1
TH2
N
H
115V
TH3
ZV1
ZV2
ZV3
YEL RED
YEL
YEL
YEL
YEL
YEL
RED
RED
RED
RED
RED
T2
R1
TV T
2
W
B1 B2
TH
TR
C1 C2
L2
GV
N
H
115V
TO CIRC.
L1
14
C2
C1
2
3 1
4
T
T
2
3 1 4
X
X
T
X
T
X
TH1 TH2
ZR1
ZR2
N
H
115V
TH TR
GV
T1
TO
ADDITIONAL
ZONES
H1
C1: ZONE CIRCULATOR
TH1: ZONE T'STAT
C2: ZONE CIRCULATOR
TH2: ZONE T'STAT
ZR1: ZONE RELAY (RA832A
OR EQUIVALENT)
ZR2: ZONE RELAY (RA832A
OR EQUIVALENT)
H1: HI-LIMIT AQUASTAT
GV: GAS VALVE
T1: 24V TRANSFORMER
T2,T3: TRANSF. (IN RELAYS)
1R-1, 1R-2: ZR1 CONTACTS
2R-1, 2R-2: ZR2 CONTACTS
FACTORY WIRING
FIELD WIRING
T1
115V
1R-2
2R-2
H1
BOILER CIRCUIT
1R-1
T2
2R-1
T3
TH2
TH1
ZR1 ZR2
CIRC.
1
CIRC.
2
115V
BLACK
WHITE
EXTERNAL CIRCUIT
GAS VALVE
COIL
FIGURE 1.20: WIRING DIAGRAM FOR ZONING WITH ZONE VALVES
FIGURE 1.21: WIRING DIAGRAM FOR ZONING WITH CIRCULATORS