Taco SR501-4 1 Zone Switching Relay

External Indicator Lights

Universal Replaceability

Snap-in PC Board

Simplified Wiring

Sealed Relays

Fuse Protected Outputs

100% Factory Tested

Contractor Friendly PC Board Layout

Universal Thermostat Compatibility

UL Approved

Extended 3 Year Warranty

Operation:

Connect a thermostat to the “T T” terminals

on the switching relay. When the thermostat

calls for heat, the relay is energized and power

is given to the circulator.

Power Input:

Connect 120 volt ac power to terminals N

and H.

Jumper Placement:

The jumper is factory installed between terminals H and 3 to switch power on terminals

4 n/o and 4 n/c.

Terminal Description:

T & T Thermostat Connection

COM Common side of transformer, to power some

setback thermostats

N Neutral wire of power input

H Hot wire of power input

3 Common terminal for 4 n/o and 4 n/c

4 n/o Normally open terminal

4 n/c Normally closed terminal

6 n/c Normally closed terminal

6 n/o Normally open terminal

5 Common terminal for 6 n/o and 6 n/c