Taco SR503-EXP User Manual

SR501-EXP Switching Relay Controlling a ZVC404/406 Zone Valve Control
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 1234 1234 1234 1234
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
TO BOILER AQUASTAT RELAY
BOILER
H
N
SYSTEM
PUMP
BOILER TURNS ON WHEN ANY ZONE VALVE OPENS.
1234
ZONE 6
PRIORITY
ZONE
JUMPER
3 & 4
SEE NOTE
Note: When a circulator is used on the priority zone instead of a zone valve, jumper 3 and 4 of the priority zone.
TTT
120 VAC
INPUT
DHW
HEATER
CIRCULATOR
POWER T STAT
AQUASTAT ON
DHW HEATER
NZCZRHHH
POWER
INPUT
120VAC
INPUT
120VAC
OUTPUT
CIRC
OUTPUT
PRIORITY
OUTPUT
RESET
POWER
CONTROLS
FUSE
1 AMP
NORMAL
MASTER
SLAVE
END
SWITCH
ZONE
VALVE
THERMOSTATEXPANSION
X
COM
T/WT/R
X1 12243
JUMPER
TO: OPTIONAL ZONE VALVE OR iSeries MIXING VALVE
MODE
FUSE
5 AMP
SR 501-EXP
A
TO BOILER AQUASTAT RELAY
MASTER
SLAVE
SYSTEM PUMP TURNS ON WHEN ANY ZONE VALVE OPENS EXCEPT WHEN THE DHW HEATER (SR501-EXP) CALLS.
13

Taco SR503-EXP Specifications

General

Brand	Taco
Model	SR503-EXP
Category	Control Unit
Language	English