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Application 303V-3
Mechanical
Electrical
Two Zone Valve Controls operate six heating zones and a domestic hot water tank. When a thermostat calls for heat, the zone
valve opens. The hot water tank is heated using a pump when the tank aquastat calls for heat. The master control operates the
system pump and the boiler when there is a call for heat on either the master or member control.
Legend
A1 = DHW Tank Aquastat
B1 = Modulating Condensing Boiler
BP = Boiler Pump
PS = System Pump
P1 = Zone 1 DHW Tank Pump
T1, T2 = WiFi Thermostat 561, 562 or 563
T3, T4 = Thermostat 518 or 519
N
L
N
Power
L
N
B1
P1
A1
Expansion
PS
V1
V2
V3
V4
V5
V6
BP
303V
304V
T5 = Generic Power-Stealing Thermostat
T6 = Generic Bi-Metallic Strip Thermostat
V1 to V6 = 4-Wire Zone Valves
Away
C R Rh W
+
T
T
-
Away
C R Rh 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
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
B1
PS
L
L
N
N
P1
V1
V2
V3
V4 V5
V6
A1
T1
T3
T4
T5 T6
T2
End switch jumper required for Zone 1 when using
a pump and Zone Valve End Switch DIP = On
DIP Switches
Master
T-stat 1 Priority On
Exercising On
Post Purge On
DIP Switches
Member
T-stat 1 Priority Off
Exercising On
Post Purge On
Mod Boiler - depends on boiler
System Pump During Priority Off
System Pump With Member Calls On
Zone Valve End Switches On
Mod Boiler - not applicable
System Pump During Priority Off
System Pump With Member Calls Off
Zone Valve End Switches On
