Taco SR501 User Manual

(cont.)
NOTE: Tankless coil has priority.
THREE ZONE SWITCHING RELAY
WITH OPTIONAL PRIORITY
THERMOSTAT
FUSE 1 AMP
24 VAC
POWER
ZONE 1 ZONE 2 ZONE 3
120 VOLT CIRCULATORS
ZC
X1
ZONE1 ZONE2 ZONE3
SR 503
ZONE 2
POWER
ZONE 1
ZONE 3
L1 L2
T T
LINE VOLTAGE
OIL BURNER RELAY
CIRCULATOR
ON BOILER
(IF ATTACHED)
B2
C1
B1ZR
HONEYWELL L8124
OR EQUAL
120 VAC INPUT
C2
ZC
THERMOSTAT
L1 L2
(NEUTRAL)(HOT)
CIRCUIT
BREAKER
CUSTOMER
EMERGENCY
SWITCH
THERMAL
FUSE
(FIROMATIC)
SERVICE
SWITCH
LOW
WATER
CUTOFF
NP H
X2
ZR
NOTE: The boiler operating control’s ZC terminal will see the load of the circulator(s).
FOUR ZONE SWITCHING RELAY
WITH OPTIONAL PRIORITY
THERMOSTATS
ZONE 4
ON
OFF
PRIORITY
120V RELAY
FUSE 1 AMP
24 VAC
POWER
ZONE 1 ZONE 2 ZONE 3 ZONE 4
120 VOLT CIRCULATORS
ZC ZR
X X
END
SWITCH
ZONE1 ZONE2 ZONE3 ZONE4
POWER
INPUT
SR 504
ZONE 2
POWER
ZONE 1
ZONE 3
ZONE 4
L1 L2
T T
LINE VOLTAGE
OIL BURNER RELAY
CIRCULATOR
ON BOILER
(IF ATTACHED)
B2
C1
B1ZR
HONEYWELL L8124
OR EQUAL
120 VAC INPUT
C2
ZC
THERMOSTAT
L1 L2
(NEUTRAL)(HOT)
CIRCUIT
BREAKER
CUSTOMER
EMERGENCY
SWITCH
THERMAL
FUSE
(FIROMATIC)
SERVICE
SWITCH
LOW
WATER
CUTOFF
4

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