UTICA BOILERS TRIFIRE II Series Installation, Operation & Maintenance Manual page 23

Figure 21 - Piping and Wiring Multi-Zone System With Circulators And Domestic Hot Water
Priority
FIGURE 21
HYDROSTAT
MODEL 3250
TO OIL
BURNER
L
120 VAC
N
10 - HYDRONIC PIPING
INDIRECT WATER
HEATER, AQUASTAT
OR THERMOSTAT
ELECTRONIC
24AC
30 VA
ARM-4P
CONTROL WITH
PRIORITY
23
TANK
CONTROL
DATA PORT
PRIORITY
ZONE
1
T T
FUSE
Z
W R
+
PRIORITY ON
COMMON
X-X
ZR-ZC
ZONE 1 ZONE 1
1
X X
L N
ISOLATED ZC ZR
PRIORITY
SWITCH
DHW
CIRC
PN 240011579 REV D [08/01/2018]
T-STAT
T-STAT T-STAT
THERMOSTATS
ZONE 2 ZONE 3 ZONE 4
2 3 4
T T T T T T
W R W R W R
ZONE MODULE
PRIORITY ON
ZONE 2 ZONE 2 ZONE 3 ZONE 3 ZONE 4 ZONE 4
2 3 4
L
L N L N L N
ZONE 2 ZONE 3 ZONE 4
120 VAC
CIRC CIRC
CIRC
COMMON
24 VAC
@ 1VA
TO EXTRA
N