3
All Caleffi Z-one controls use the same interface
to connect to thermostats. This interface is
very flexible and allows many different types
of thermostats to be connected to the control
including 2, 3 and 4 wire versions. In addition, any
type of switching device can be used to signal a
heat demand by connecting the R & W (T & T)
terminals together. The terminals are dual labeled
to help simplify wiring.
Z-one Thermostat Connections
6 Zone
T-STAT 2
C
R
W
T
T COM
COMMS
D
P
DHW
ZR/ZC
X X
T-STAT 3
C
R
W
T
T COM
T-STAT 1
C
R
W
T
T COM
L
PUMP 2
N
PRIMARY
PUMP
L
PRIORITY
PUMP 1
N
L
POWER IN
N
GROUNDS
L
PUMP 3
N
TRANSFORMER
L
N
T-STAT 4
C
R
W
T
T COM
L
PUMP 4
N
L
PUMP 5
N
L
PUMP 6
N
T-STAT 5
C
R
W
T
T COM
T-STAT 6
C
R
W
T
T COM
PWR
ZONE1
ZONE2
ZONE3
ZONE4
ZONE5
ZONE6
DipSwitches
Master
Slave
Priority OFF
Priority ON
Primary OFF
Primary ON
Exercise OFF
Exercise ON
Post Purge OFF
Post Purge ON
ZSR106
Z-one T-stat interface
Description
R = 24 VAC Supply
W = Heat Call
C = 24 VAC Common
Function
R&W: When connected, signals a heat demand.
R&C: Provides 24 VAC to powered thermostats.
There are a few different types of 2 wire thermostats
including bi-metallic, power stealing and battery
powered. All of these thermostats connect in
the same manner to the Caleffi Z-one series of
controls. Connect R to R and W to W. See below.
2-Wire Thermostats
6 Zone
Z6P
THM 2
C
R
W
T
T COM
COMMS
D
P
DHW
ZR/ZC
X X
THM 3
C
R
W
T
T COM
THM 1
C
R
W
T
T COM
L
PUMP 2
N
PRIMARY
PUMP
L
PRIORITY
PUMP 1
N
L
POWER IN
N
GROUNDS
L
PUMP 3
N
TRANSFORMER
12/20VA
L
N
THM 4
C
R
W
T
T COM
L
PUMP 4
N
L
PUMP 5
N
L
PUMP 6
N
THM 5
C
R
W
T
T COM
THM 6
C
R
W
T
T COM
PWR
ZONE1
ZONE2
ZONE3
ZONE4
ZONE5
ZONE6
DipSwitches
Master
Slave
Priority OFF
Priority ON
Primary OFF
Primary ON
Exercise OFF
Exercise ON
Post Purge OFF
Post Purge ON
To connect a 4-wire thermostat to the Z-one
series controls, connect R to R, W to W and C
to C. A jumper in the thermostat is also required
between R & Rh as shown below. Similar to a
3-wire thermostat, R & C from the Z-one Control
supply constant 24 VAC to the thermostat.
4-Wire Thermostats
Three wire thermostats get their power from the
control they are connected to. R & C from the
Z-one Control supply 24 VAC to the thermostat at
all times while the W lead signals a heat demand.
3-Wire Thermostats
6 Zone
Z6P
THM 2
C
R
W
T
T COM
COMMS
D
P
DHW
ZR/ZC
X X
THM 3
C
R
W
T
T COM
THM 1
C
R
W
T
T COM
L
PUMP 2
N
PRIMARY
PUMP
L
PRIORITY
PUMP 1
N
L
POWER IN
N
GROUNDS
L
PUMP 3
N
TRANSFORMER
12/20VA
L
N
THM 4
C
R
W
T
T COM
L
PUMP 4
N
L
PUMP 5
N
L
PUMP 6
N
THM 5
C
R
W
T
T COM
THM 6
C
R
W
T
T COM
PWR
ZONE1
ZONE2
ZONE3
ZONE4
ZONE5
ZONE6
DipSwitches
Master
Slave
Priority OFF
Priority ON
Primary OFF
Primary ON
Exercise OFF
Exercise ON
Post Purge OFF
Post Purge ON
6 Zone
Z6P
THM 2
C
R
W
T
T COM
COMMS
D
P
DHW
ZR/ZC
X X
THM 3
C
R
W
T
T COM
THM 1
C
R
W
T
T COM
L
PUMP 2
N
PRIMARY
PUMP
L
PRIORITY
PUMP 1
N
L
POWER IN
N
GROUNDS
L
PUMP 3
N
TRANSFORMER
12/20VA
L
N
THM 4
C
R
W
T
T COM
L
PUMP 4
N
L
PUMP 5
N
L
PUMP 6
N
THM 5
C
R
W
T
T COM
THM 6
C
R
W
T
T COM
PWR
ZONE1
ZONE2
ZONE3
ZONE4
ZONE5
ZONE6
DipSwitches
Master
Slave
Priority OFF
Priority ON
Primary OFF
Primary ON
Exercise OFF
Exercise ON
Post Purge OFF
Post Purge ON
6 Zone
Z6P
THM 2
C
R
W
T
T COM
COMMS
D
P
DHW
ZR/ZC
X X
THM 3
C
R
W
T
T COM
THM 1
C
R
W
T
T COM
L
PUMP 2
N
PRIMARY
PUMP
L
PRIORITY
PUMP 1
N
L
POWER IN
N
GROUNDS
L
PUMP 3
N
TRANSFORMER
12/20VA
L
N
THM 4
C
R
W
T
T COM
L
PUMP 4
N
L
PUMP 5
N
L
PUMP 6
N
THM 5
C
R
W
T
T COM
THM 6
C
R
W
T
T COM
PWR
ZONE1
ZONE2
ZONE3
ZONE4
ZONE5
ZONE6
DipSwitches
Master
Slave
Priority OFF
Priority ON
Primary OFF
Primary ON
Exercise OFF
Exercise ON
Post Purge OFF
Post Purge ON
C
R
Rh W1
A heat demand can also be initiated by any type
of device that has dry contacts (dry contacts are
a set of contacts that open and close but do not
have any voltage present until supplied from an
outside source). The end switch on a Z-one series
zone valve is an example of a dry contact. Using
a dry contact to connect R to W will initiate a heat
demand.
Dry Contacts
Always refer to the thermostat manufacturer’s instructions.
SAFETY INSTRUCTION
This safety alert symbol will be used in this manual to draw attention to safety
related instructions. When used, the safety alert symbol means
ATTENTION!
BECOME ALERT! YOUR SAFETY IS INVOLVED! FAILURE TO FOLLOW THESE
INSTRUCTIONS MAY RESULT IN A SAFETY HAZARD.
CAUTION:
All work must be performed by qualified personnel trained in the
proper application, installation, and maintenance of systems in accordance with all
applicable codes and ordinances.
CAUTION:
Electrical shock hazard. Disconnect power before installation to prevent
electrical shock or equipment damage. Make sure all connections are in accordance
with the electrical wiring diagram and in accordance with national and local electrical
codes.
CAUTION:
Avoid electrical noise interference. Do not install near large conductors,
electrical machinery, or welding equipment. Avoid locations where excessive
moisture, corrosive fumes, vibration, or explosive vapors are present.
Caleffi shall not be liable for damages resulting from misapplication or misuse of it products.
WARNING:
NEVER CONNECT R & C DIRECTLY,
this will be a direct short on the 24 VAC supply
