Installation Guide

3
Alternative
Wiring
ONE ZONE HC
S
WITCHING RELAY
SR 501-HC-4
LED
INDICATORS
R
W1
24 VAC THERMOSTAT
W2
COM
24
VAC
TT T
NHX1
RELAY 2RELAY 1
120 VAC
INPUT
120 VAC
C
IRCULATOR
X1
X2
X2
N
ZR
ZC
H
POWER INPUT
(120 VAC)
POWER
RELAY 1
RELAY 2
O
NE ZONE HC
SWITCHING RELAY
SR 501-HC-4
LED
INDICATORS
R
W
1
24 VAC THERMOSTAT
W
2
COM
24
VAC
TT T
NHX1
R
ELAY 2RELAY 1
120 VAC
I
NPUT
P
OWER
INPUT
(120 VAC)
120 VAC
CIRCULATOR
X1
X2
X2
N
H
BOILER
C
ONTROL
P
OWER
R
ELAY 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
TT T
NHX1
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
TT T
NHX1
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
V
AC
TT T
NHX1
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)
T
HERMOSTAT #1
(24 VAC)
POWER
INPUT
(120 VAC)
POWER
RELAY 1
RELAY 2
N
OTE: When using Alternative Wiring diagram, refer to important NOTE
and WARNING in SR501-HC Instruction Sheet on page 91 of this booklet.
R
ELAY RATING:
3
⁄
4
H
P (13.8 FLA, 82.8 LRA at 120 VAC)
(6.9 FLA, 41.4 LRA at 240 VAC)