Product Overview

R
W
C
T
T
com
power
zone
transformer
N LG LG
N LL
RELAY 1
C N/O N/C C N/O N/C
RELAY 2
thermostat
outdoor
temperature
sensor
space
heating
demand
single zone relay
1 Zone
ZSR101
C
R
W
T T COM
L
POWER IN
N
C
RELAY #1
NO
NC
C
RELAY #2
NO
NC
TRANSFORMER
PWR
ZONE
Operating principles (illustrative example)
Large screw terminal connections makes wiring easy. Power IN 120V AC
to N and L screw terminals with a factory installed jumper from L terminal
to the C terminal of Relay 1 for simplifi ed pump connection.
1 Zone
ZSR101
C
R
W
T T COM
L
POWER IN
N
C
RELAY #1
NO
NC
C
RELAY #2
NO
NC
TRANSFORMER
P
ZONE
1 Zone
ZSR101
C
R
W
T T COM
L
POWER IN
N
C
RELAY #1
NO
NC
C
RELAY #2
NO
NC
TRANSFORMER
PWR
ZONE
We reserve the right to change our products and their relevant technical data, contained in this publication, at any time and without prior notice.
Caleffi North America, Inc.
3883 W. Milwaukee Road
Milwaukee, WI 53208
Tel: [phone] · Fax: [phone]
sales@caleffi.com · www.caleffi.com/usa/en-us
© Copyright 2014 Caleffi North America, Inc.
R, W, C and T, T, COM dual labeling at
thermostat terminals. Compatible with
low voltage 2, 3, or 4 wire thermostats
or any other low voltage devices
having a switching action.
T T
When a zone has a demand from a thermostat (T T or R W) the relay will
close sending 120 VAC to Relay 1 NO terminal switching ON the pump,
Relay 2 closes C to NO dry contact, signaling the boiler of a heating
demand. Refer to Z-one™ Relay Wiring Guide for more system wiring
diagrams.