Caleffi Z1, Z2, Z3 User Manual

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Z-one™ Z1, Z2, Z3 Series

Function

The Z-one, a two-position spring return zone valve,
is used in heating and air-conditioning systems.
The Z-one series consist of a Z1 actuator which is
easily attached to a Z2 (2-way) or Z3 (3-way) valve
body. Z1 actuator is equipped with or without
auxiliary switch.

The Z-one actuator has a synchronous motor that
winds the return spring and moves the valve paddle
to the desired position. When power is removed the
actuator spring returns the valve paddle. 24V
actuators (except HCS) use sealed reed switch for
end switch, requiring no minimum current load.

US Patent 7,048,251

Technical Characteristics of Body

Material: - body: forged brass
(optional lead-free brass)

- seat: machined brass

- stem: stainless steel

- two o-ring seals EPDM

- paddle EPDM
Medium: water and glycol
Maximum percent of glycol: 50%
Temperature range: 32 to 240°F (0 – 115°C)
Max. static pressure: 15 psi (1 bar) steam
300 psi (20 bar)

Connection: - sweat ½”, ¾” 1” & 1 ¼”

- NPT ½”, ¾” & 1”

- SAE flare ½”

- inverted flare ½”, ¾” & 1” sweat fittings
separate

Technical Characteristics of Actuator

Material: - base and cover: polycarbonate

- base plate: aluminum
Motor: - voltage: 24 VAC 50/60 Hz Class 2
120 VAC 50/60 Hz
208 VAC 50/60 Hz
230 VAC 50/60 Hz
277 VAC 50/60 Hz

Wire lead length: 6” (15cm), 24V only -18” (45cm)
Power requirements: 5.0 W, 7 VA
Ambient temperature range: 32 - 104ºF (170ºF optional)
Auxiliary switch: 24 VAC: 0 A min,

0.4 A max, 24 V
120-277 VAC, HCS:

0.25A min, 5A max, 250 V
Humidity: 95% non-condensing
Approvals: UL874, cUL Listed & CE
UL 1995 sec. 18 (air plenum & ducts)
Normally Open Actuators must be powered down

during off-season.

Flow Characteristics

Connection size Flow Coefficient

1/2" 1.0 Cv (0.9 kv) 75 PSI (517 kPa)
1/2"

3/4"
1/2"
3/4"
3/4"

1"

3/4"

1"
1"

1 1/4"

2.5 Cv (2.2 kv) 50 PSI (345 kPa)

3.5 Cv (3.0 kv) 30 PSI (207 kPa)

5.0 Cv (4.3 kv) 25 PSI (172 kPa)

7.5 Cv (6.5 kv) 20 PSI (138 kPa)

7.5 Cv (6.5 kv) 20 PSI (138 kPa)

Max. Close-off P

Installation

The valve can be installed vertically or horizontally, but not turned upside down.

- A 3-way valve cannot be transformed into a 2-way valve and vice versa.

- The flow is from A to B (see diagram below) and must be installed so the paddle

closes against the direction of flow as indicated in the following diagrams.

- The 2-way valves can be ins talled on the
supply or on the return; for correct
installation it is necessary to respect the
direction of flow indicated from the arrow
on the body valve.

A

B

2-way valve with normally closed actuator

2-way installed on the supply

2-way installed on the return