Wiring Guide

3
Alternative
Wiring
ONE ZONE HC
SWITCHING RELAY
SR 501-HC-4
LED
INDICATORS
R
W1
24 VAC THERMOSTAT
W2
COM
24
VAC
TTT
NH X1
RELAY 2RELAY 1
120 VAC
INPUT
120 VAC
CIRCULATOR
X1
X2
X2
N
ZR
ZC
H
POWER INPUT
(120 VAC)
POWER
RELAY 1
RELAY 2
ONE ZONE HC
SWITCHING RELAY
SR 501-HC-4
LED
INDICATORS
R
W1
24 VAC THERMOSTAT
W2
COM
24
VAC
TTT
NH X1
RELAY 2RELAY 1
120 VAC
INPUT
POWER
INPUT
(120 VAC)
120 VAC
CIRCULATOR
X1
X2
X2
N
H
BOILER
CONTROL
POWER
RELAY 1
RELAY 2
Typical
Wiring
SR501-HC-4 – One Zone Switching Relay with or without Boiler Enable
ONE ZONE HC
SWITCHING RELAY
SR 501-HC-4
LED
INDICATORS
R
W1
24 VAC THERMOSTAT
W2
COM
24
VAC
TTT
NH X1
RELAY 2RELAY 1
120 VAC
INPUT
240 VAC
CIRCULATOR
X1
X2
X2
N
H1
H2
ONE ZONE, NO BOILER ENABLE
(CONTROL & CIRCULATOR SAME POWER SOURCE)
CONTROL POWER
INPUT (120 VAC)
POWER
RELAY 1
RELAY 2
(240 VAC)
{
{
ONE ZONE HC
SWITCHING RELAY
SR 501-HC-4
LED
INDICATORS
R
W1
24 VAC THERMOSTAT
W2
COM
24
VAC
TTT
NH X1
RELAY 2RELAY 1
120 VAC
INPUT
240 VAC
CIRCULATOR
X1
X2
X2
N
H1
H2
ONE ZONE, NO BOILER ENABLE
(CONTROL & CIRCULATOR DIFFERENT POWER SOURCE)
H
POWER
RELAY 1
RELAY 2
CONTROL POWER
INPUT (120 VAC)
(240 VAC)
{
{
ONE ZONE HC
SWITCHING RELAY
SR 501-HC-4
LED
INDICATORS
R
W1
W2
COM
24
VAC
TTT
NH X1
RELAY 2RELAY 1
120 VAC
INPUT
CIRCULATOR #1
(120 VAC)
X1
X2
X2
N
TWO ZONE, NO BOILER ENABLE
H
CIRCULATOR #2
(120 VAC)
THERMOSTAT #2
(24 VAC)
THERMOSTAT #1
(24 VAC)
POWER
INPUT
(120 VAC)
POWER
RELAY 1
RELAY 2
NOTE: When using Alternative Wiring diagram, refer to important NOTE
and WARNING in SR501-HC Instruction Sheet on page 91 of this booklet.
RELAY RATING:
1
/
3
HP (13.8 FLA, 82.8 LRA at 120 VAC)
(6.9 FLA, 41.4 LRA at 240 VAC)