Taco SR501 User Manual

SR501-EXP and PC700 Boiler Reset Control Connected to an Existing Zone Valve Control
120 VAC
INPUT
BOILER
H
N
EXISTING
ZONE
CONTROL
PRIMARY
SYSTEM
CIRCULATOR
(Optional)
POWER
T STAT
TO: "TT" ON BOILER
END
SWITCH
RESET
OVERRIDE
THERMOSTATEXPANSION
X
COM T/WT/R
X1 12243
JUMPER
RESET
POWER
CONTROLS
FUSE
1 AMP
NORMAL
MODE
DHW HEATER
CIRCULATOR
Note: If Zone Control comes on without a call for heat,
reverse Reset Override input (1 & 2) wires on SR501-EXP.
ZONE
CONTROL
BOIL
SEN
OUT
SEN
BOILER SENSOR
OUTDOOR
SENSOR
PC700
24 VAC
POWER IN
ZONE 2 ZONE 3 ZONE 4
MODE
NORMAL RESET
FUSE
(3 AMP MAX)
ZONE 1
TT
TT TT TT
ZONE 4
PRIORITY
OFF
ON
N/O COM
N/C
ZONE 4 RELAY
1234 1234
ZONE 1 ZONE 2
2 WIRE ZONE VALVE
(NO END SWITCH)
JUMPER
3 & 4
TACO
3 WIRE ZONE VALVE
1
2
3
1234
ZONE 3
MOTOR
END
SWITCH
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
POWER
END
SWITCH
EXTRA
END
SWITCH
MAIN
24
VAC
FACTORY
INSTALLED
TRANSFORMER
120 VAC
INPUT
WHITE
BLACK
ZVC 404
FOUR ZONE ZONE VALVE CONTROL
WITH OPTIONAL PRIORITY
1234
ZONE 4
PRIORITY
ZONE
JUMPER
3 & 4
SEE NOTE
THERMOSTATS
T
T
T
Note: When a circulator is used on the
priority zone instead of a zone valve,
jumper 3 and 4 of the priority zone.
AQUASTAT ON
DHW HEATER
A
ZONE VALVE SYSTEM
CIRCULATOR
NZCZRHHH
POWER
INPUT
120VAC
INPUT
120VAC
OUTPUT
CIRC
OUTPUT
PRIORITY
OUTPUT
SR 501-EXP
MASTER
SLAVE
FUSE
5 AMP
K1-A
K1-B K2-A K2-A
K1 K2
Connecting a DHW Heater to an Existing Heating Only Zone Valve Control
Using an SR501-EXP and PC700 Boiler Reset Control
120 VAC
INPUT
BOILER
H
N
EXISTING
ZONE
CONTROL
DHW HEATER
CIRCULATOR
POWER
T STAT
TO: "TT" ON BOILER
END
SWITCH
RESET
OVERRIDE
THERMOSTATEXPANSION
X
COM T/WT/R
X1 12243
JUMPER
RESET
POWER
CONTROLS
FUSE
1 AMP
NORMAL
MODE
ZONE
CONTROL
BOIL
SEN
OUT
SEN
BOILER SENSOR
OUTDOOR
SENSOR
PC700
24 VAC
POWER IN
ZONE 2 ZONE 3 ZONE 4
MODE
NORMAL RESET
FUSE
(3 AMP MAX)
ZONE 1
TT
TT TT TT
ZONE 4
PRIORITY
OFF
ON
N/O COM
N/C
ZONE 4 RELAY
1234 1234
ZONE 1 ZONE 2
2 WIRE ZONE VALVE
(NO END SWITCH)
JUMPER
3 & 4
TACO
3 WIRE ZONE VALVE
1
2
3
1234
ZONE 3
MOTOR
END
SWITCH
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
POWER
END
SWITCH
EXTRA
END
SWITCH
MAIN
24
VAC
FACTORY
INSTALLED
TRANSFORMER
120 VAC
INPUT
WHITE
BLACK
ZVC 404
FOUR ZONE ZONE VALVE CONTROL
WITH OPTIONAL PRIORITY
1234
ZONE 4
PRIORITY
ZONE
JUMPER
3 & 4
SEE NOTE
THERMOSTATS
T
T
T
Note: When a circulator is used on the
priority zone instead of a zone valve,
jumper 3 and 4 of the priority zone.
AQUASTAT ON
DHW HEATER
A
ZONE VALVE SYSTEM
CIRCULATOR
MASTER
SLAVE
NZCZRHHH
POWER
INPUT
120VAC
INPUT
120VAC
OUTPUT
CIRC
OUTPUT
PRIORITY
OUTPUT
SR 501-EXP
MASTER
SLAVE
FUSE
5 AMP
K1-A
K1-B K2-A K2-A
K1 K2
19

Taco SR501 Specifications

General

Model	SR501
Category	Control Unit
Input Voltage	120 VAC
Frequency	60 Hz
Switch Type	SPDT
Enclosure Rating	NEMA 1
Type	Relay
Operating Temperature	0°C to 40°C
Relay Output	24 VAC