Zone Valve - Dunkirk EXCELSIOR EXB4075 Installation, Operation & Maintenance Manual

Figure 19 - Multi-Zone Piping and Wiring With Zone Valves And Domestic Hot Water Priority (With

Zone Valve)

FIGURE 19
HYDROSTAT
MODEL 3250
TO OIL
BURNER
L
120 VAC
N
10 - HYDRONIC PIPING
(SEE FIGURE 20)
24VAC FROM
TRANSFORMER
C
24 VAC
R
X X
120VAC TO
TRANSFORMER
L
120 VAC
TO XFRM
N
PRIMARY
120VAC
PUMP
N L L N
CIRC
RELAY
24VAC COIL
120VAC CONTACTS
21
*
INDIRECT WATER
HEATER, AQUASTAT
OR THERMOSTAT
TANK
CONTROL
T-STAT
T T T
TO DPM-2
Z1
STATUS
PRIORITY ON
PRIMARY PUMP
PRIORITY PUMP
X-X CONTACT
ZR ON
ZC ON
PRIORITY
FROM BOILER
PUMP
L N ZR ZC
AZ-4CP
1 2 3 4 1 2 3
PRI ZONE 1 ZONE 2
ZONE
VALVE
DHW ZONE
VALVE
ON
ZONE VALVE / PUMP
PRIORITY
ZR-ZC
DPM-2
OPTION SWITCHES
T-STAT
KEY
T-STAT
ON
OFF
T T T T T
Z2 Z3 Z4
ZONE VALVE / PUMP
PRIORITY
ZR-ZC
DPM-2
OPTION SWITCHES
4 1 2 3 4 1 2 3 4
ZONE 3 ZONE 4
ZONE
VALVE
ZONE
VALVE