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Application 305V-2
Mechanical
Electrical
The Zone Valve Control 305V operates a four heating zones and a domestic hot water tank. When a thermostat calls
for heat, the zone valve opens and the system pump and the boiler turn on once the zone valve end switch closes. The
domestic hot water tank is heated using a pump. When priority is selected, the heating zones are shut off while the
hot water tank is heated.
Legend
A1 = DHW Tank Aquastat
B1 = Modulating Condensing Boiler
BP = Boiler Pump
PS = System Pump
P1 = Zone 1 DHW Tank Pump
T1 = WiFi Thermostat 561, 562 or 563
I n c l u d e d 510 Ω
resistor must be
i n s t a l l e d w h e n
u s i n g p o w e r
stealing thermostats
(e.g. Thermostat T3)
End switch jumper required
for Zone 1 when using a
pump and Zone Valve End
Switch DIP = On
L
N
Power
L
N
System
Pump
L
N
B1
PS
P1
V1
V2
V3
V4
A1
BP
305V
T2 = Thermostat 518 or 519
T3 = Generic Digital Power-Stealing Thermostat
T4 = Generic Bi-Metallic Strip Thermostat
V1 = 2-Wire Zone Valve
V2 = 3-Wire Zone Valves (e.g. Taco 570)
V3, V4 = 4-Wire Zone Valve
Away
C R Rh W
Away
C R Rh W
R W
R W
MOD
X X
tN4
T1
T2
T3
T4
T5
T6
A
DHW
C R W
BOILER
T-STAT 1
T-STAT 2
T-STAT 3
-
+
tN4
A C R W
tN4
A C R W
T-STAT 4
tN4
A C R W
T-STAT 5
tN4
A C R W
T-STAT 6
EXPANSION
tN4
A C R W
tN4
A B C D E
FUSE 2 FUSE 1
END
SWITCH
MOTOR
POWER
PRIORITY
SYS PUMP
ROOM
RESPONSE
ZONE 1
70 80
90
60
50
100
MOD MAX %
END
SWITCH
MOTOR
ZONE 2
END
SWITCH
MOTOR
ZONE 3
END
SWITCH
MOTOR
ZONE 4
END
SWITCH
MOTOR
ZONE 5
END
SWITCH
MOTOR
ZONE 6
MASTER
MEMBER
OFF
OFF
OFF
T-STAT 1 PRIORITY : ON
EXERCISING : ON
POST PURGE : ON
MOD BOILER : 0-10V
SYSTEM PUMP DURING PRIORITY: ON
SYSTEM PUMP WITH MEMBER CALL: ON
ZONE VALVE END SWITCHES: ON
RESERVED
120 VAC
POWER
PUMP
PUMP 1
SYSTEM
PRIORITY
L
N
L
N
L
N
OFF
OFF
OFF
4-20 mA
1 2 3
+
T-T
DHW
-
B1
A1
T1
P1
L N
PS
V1
V2
V3
V4
T2
T3
T4
DIP Switches
Master
T-stat 1 Priority On
Exercising On
Post Purge On
Mod Boiler - depends on boiler
System Pump During Priority Off
System Pump With Member Calls Off
Zone Valve End Switches On
