Taco SR501 User Manual

SR501-EXP and PC700 Boiler Reset Control Connected to an Existing
Tankless Coil Boiler – Zoning with Circulators
FOUR ZONE SWITCHING RELAY
WITH OPTIONAL PRIORITY
ZONE 4
ON
OFF
PRIORITY
120V RELAY
120 VOLT CIRCULATORS
ZC ZR
X X
END
SWITCH
POWER
INPUT
120 VAC
INPUT
ZONE1 ZONE2 ZONE3 ZONE4
ZONE1 ZONE2 ZONE3 ZONE4
FUSE 1 AMP
24 VAC POWER
SR 504
ZONE 2
POWER
ZONE 1
ZONE 3
ZONE 4
THERMOSTATS
BOILER
H
N
EXISTING
ZONE
CONTROL
T
POWER
T STAT
TO: "ZR" ON BOILER CONTROL
END
SWITCH
RESET
OVERRIDE
THERMOSTATEXPANSION
X
COM T/WT/R
X1 12243
JUMPER
RESET
POWER
CONTROLS
FUSE
1 AMP
NORMAL
MODE
REMOVE
JUMPER
PRIMARY
SYSTEM
CIRCULATOR
(Optional)
ZONE
CONTROL
BOIL
SEN
OUT
SEN
BOILER SENSOR
OUTDOOR
SENSOR
PC700
Boiler and Zone Control(s) need to be on same power supply (same circuit breaker).
TO: "ZC" ON BOILER CONTROL
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
SR501-EXP and PC700 Boiler Reset Control Connected to an Existing
Tankless Coil Boiler – Zoning with Zone Valves
120 VAC
INPUT
BOILER
H
N
EXISTING
ZONE
CONTROL
POWER
T STAT
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
Boiler and Zone Control(s) need to be on same power supply (same circuit breaker).
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.
ZONE VALVE SYSTEM
CIRCULATOR
MASTER
SLAVE
TO: "ZR" ON BOILER CONTROL
PRIMARY
SYSTEM
CIRCULATOR
(Optional)
TO: "ZC" ON BOILER CONTROL
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
20

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