Product Overview

Z-one™ Relay, ZSR series
Multi-zone pump switching relay. Compatible with 2, 3 and 4-wire thermostats or low voltage controllers with switching action.
Power supply 120 VAC, 50/60 Hz. Zone priority selectable with 1 hour time-out feature. System pump status (on/off) during
priority selectable. Transformer voltage: 24 VAC. R,W,C and T,T,COM dual labeling at thermostat terminals. Dry contacts
(XX,AUX,T,T,ZONE 1 E/S) capable of switching line voltage. Automatic resettable fuse on 24 V circuit. Expandable to unlimited
number of zones using 3-wire connection between controls. Large screw terminals. Front panel LED indicator light for functional
status. ETL certified to CSA C22-2 No. 24, conforms to UL873. Provided with heavy duty, sealed relays, 1 primary pump output
and 3 to 6 (model dependent) zone pump outputs (120 VAC/5A each), high capacity 12 VA transformer on 3 and 4 zone models,
and 20 VA transformer on 6 zone models, and 3 pump ground terminals. Temperature limits for shipping, storage and operating:
110 degrees F (43 degrees C). Maximum humidity: 90 percent non-condensing. Electrical switch rating: 20A maximum combined.
Electrical switch rating pump output: 120 VAC, 5A each. Dry contact rating XX,AUX,T,T,ZONE 1 E/S: 120 VAC, 2A each.
SPECIFICATION SUMMARY
DHW
aquastat
T T
DHW
outdoor
temperature
sensor
Pump 2
boiler
high limit
control
DHW
aquastat
L
N
Pump 3 Pump 4 Pump 5 Pump 6
Pump 1
L
PUMP 2
N
PRIMARY
PUMP
L
PRIORITY
PUMP 1
N
L
POWER IN
N
GROUNDS
L
PUMP 3
N
TRANSFORMER
L
N
L
PUMP 4
N
L
PUMP 5
N
L
PUMP 6
N
POWER
ZONE1
ZONE2
ZONE3
ZONE4
ZONE5
ZONE6
T-STAT 2
C
R
W
T T COM
COMMS
D
P
ZONE 1
E / S
X X
T-STAT 3
C
R
W
T T COM
T-STAT 1
C
R
W
T T COM
T-STAT 4
C
R
W
T T COM
T-STAT 5
C
R
W
T T COM
T-STAT 6
C
R
W
T T COM
AUX
6 Zone
ZSR106
MASTER
PRIORITY ON
REMOTE ENABLE ON
EXERCISE ON
POST PURGE ZONE#1 ON
SLAVE
OFF
OFF
OFF
OFF
REMOTE ENABLE
24 - 120 VAC
L
N
ON
OFF
STATUS
DURING
PRIORITY
Traditional boiler, indirect DHW with priority,
zone pumps
We reserve the right to make changes and improvements to the products and related data 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]
[e-mail] · www.caleffi.com
© Copyright 2016 Caleffi North America, Inc.
Hydronic diagram is for illustration purposes only, some components have been removed for simplicity.