Dunkirk Excelsior EXB Series - Manual (Page 22)

CIRC
L
N
120 VAC
TO OIL
BURNER
120VAC
N L
PRIMARY
PUMP
L N
PRIORITY
PUMP
L N
FROM BOILER
ZC ZR
N
L
120 VAC
TO XFRM
R
24 VAC
C
X X
TO DPM-2
X-X CONTACT
ZR ON
PRIORITY PUMP
PRIMARY PUMP
PRIORITY ON
STATUS
ZC ON
PRI ZONE 1
1 2
ZONE 4
4 3 1 3
ZONE 2
2 4
ZONE 3
1 2 3 4 2 1 3 4
OPTION SWITCHES
ZR-ZC
DPM-2
ZONE VALVE / PUMP
PRIORITY
Z1 Z2 Z3 Z4
T T T T T T T T
AZ-4CP
120VAC TO
TRANSFORMER
24VAC FROM
TRANSFORMER
ZONE
VALVE
ZONE
VALVE
ZONE
VALVE
T-STAT
T-STAT
T-STAT
CONTROL
TANK
OR THERMOSTAT
HEATER, AQUASTAT
INDIRECT WATER
HYDROSTAT
MODEL 3250
DHW
CIRC
FIGURE 20
ON
OPTION SWITCHES
ZONE VALVE / PUMP
ZR-ZC
DPM-2
PRIORITY
KEY
ON
OFF
22
Figure 20 - Piping and Wiring Multizone System With Zone Valves And Domestic Hot Water Priority
(With Circulator)
10 - HYDRONIC PIPING