Taco SR503-EXP User Manual

24 VAC
ZONE 1 ZONE 2 ZONE 3 ZONE 4 ZONE 5 ZONE 6
MODE
NORMAL RESET
FUSE (7 AMP MAX)
TT
TT TT TT TT TT
ZONE 6 PRIORITY
OFF
ON
ZVC 406
1234 12 34 1234 1234 12 34
ZONE 1 ZONE 2 ZONE 3 ZONE 4 ZONE 5
2 WIRE ZONE VALVE
(NO END SWITCH)
JUMPER
3 & 4
TACO
3 WIRE ZONE VALVE
1
2
3
MOTOR
END
SWITCH
THERMOSTAT
THERMOSTAT
THERMOSTAT
4 WIRE ZONE VALVE
(POWER OPEN, SELF CLOSING)
T STAT 1 VALVE 1 T STAT 2 VALVE 2 T STAT 3 VALVE 3 T STAT 4 VALVE 4 T STAT 5 VALVE 5 T STAT 6 VALVE 6 POWER
SIX ZONE ZONE VALVE CONTROL
WITH OPTIONAL PRIORITY
24 VAC
FACTORY
INSTALLED
TRANSFORMER
120 VAC
INPUT
WHITE
BLACK
POWER IN
24 VAC
FACTORY
INSTALLED
TRANSFORMER
120 VAC
INPUT
WHITE
BLACK
N/O COM
ZONE 6 RELAY
END
SWITCH
EXTRA
END
SWITCH
MAIN
N/C
1234
ZONE 6
PRIORITY
ZONE
JUMPER
3 & 4
SEE NOTE
TO BOILER AQUASTAT RELAY
BOILER
H
N
DHW
PUMP
Note: When a circulator is used on the priority zone instead of a zone valve, jumper 3 and 4 of the priority zone.
A
AQUASTAT ON
DHW HEATER
BOILER TURNS ON WHEN ANY ZONE VALVE OPENS. DHW PUMP TURNS ON ONLY WHEN PRIORITY ZONE CALLS.
TTT
31
ZVC404/406 with Domestic Hot Water (DHW) Pump

Taco SR503-EXP Specifications

General

Brand	Taco
Model	SR503-EXP
Category	Control Unit
Language	English