Dunkirk Excelsior EXB Series - Manual (Page 25)

25
10 - HYDRONIC PIPING
CONTROL
TANK
OR THERMOSTAT
HEATER, AQUASTAT
INDIRECT WATER
T-STAT
CIRC
L
N
120 VAC
TO OIL
BURNER
HYDROSTAT
MODEL 3250
3
ZONE 3
+
X
ISOLATED
SWITCH
ARM-4P
CONTROL WITH
PRIORITY
+
30 VA
COMMON
24AC
ZC
X
ZR
L
2
N
1
L N L
ZONE 1
PRIORITY ON
X-X
+
ZR-ZC
ZONE 2
+
Z
DATA PORT
120 VAC
N
4
L N L N
ZONE MODULE
TO EXTRA
PRIORITY ON ZONE 4
COMMON
1 3 2 4
ZONE 4 ZONE 3 ZONE 2 ZONE
PRIORITY
THERMOSTATS
24 VAC
@ 1VA
ZONE 4 ZONE 3 ZONE 2 PRIORITY
ELECTRONIC
FUSE
ZONE 3 ZONE 1 ZONE 2 ZONE 4
T
W
T
R
T
W
T
R
T
W
T
R
T
W
T
R
CIRC
DHW
CIRC
CIRC
T-STAT
T-STAT
FIGURE 22
RELAY
120VAC COIL
120VAC CONTACTS
BLR
CIRC