You want to replace an ageing Polyaire ZoneMaster ZoneSwitch V2 zone controller with a smart unit. The good news: you can often keep the existing damper motors. This article explains how damper compatibility really works.
Compatibility Starts With the Actuator, Not the Connector
Australian ducted-air-conditioning zone systems use 24VAC two-position damper actuators. These actuators have three control functions:
- OPEN
- COMMON
- CLOSE
The trade calls these actuators drive-open / drive-close, DO/DC, or 3-point open/close. The three connections tell the motor to open, hold, or close the damper blade.
The physical connector is not a universal standard. RJ12 plugs are common, but different manufacturers put OPEN, COMMON and CLOSE on different RJ12 pins. A compatible actuator may need re-termination or an adapter cable.
The TekOnline Compatibility Position
TekOnline defines compatibility by the electrical actuator standard, not by the brand or model of the old wall controller.
TekOnline 24VAC damper compatibility: designed for standard 24VAC two-position HVAC zone actuators using OPEN, COMMON and CLOSE control. Existing damper motors can often be retained when replacing an older zone controller. Connector styles and RJ11/RJ12 pinouts vary between manufacturers, so wiring must be verified before connection.
Do not assume that any RJ12 damper is compatible. The correct rule is:
Standard 24VAC OPEN / COMMON / CLOSE dampers are compatible, subject to actuator current rating and correct wiring or pinout.
Industry Evidence
Several Australian manufacturers use the same 24VAC three-function standard. This shows the standard is an established industry convention, not a TekOnline invention.
Fujitsu General Australia
Fujitsu calls its supported actuators “standard 24V AC zone motors”. Its UTY-CDRXZC controller supplies these functions:
| RJ12 pins | Function |
|---|---|
| 1 & 2 | OPEN active |
| 3 & 4 | COMMON |
| 5 & 6 | CLOSE active |
Fujitsu also documents the UTY-ANY controller. It uses the same 24VAC zone motor but a different RJ12 pinout:
| RJ12 pin | Function |
|---|---|
| 2 | CLOSE active |
| 3 | COMMON |
| 4 | OPEN active |
Fujitsu says the same motor can move between the two controller types by rewiring the RJ12 connector. This is strong evidence for the key distinction: electrical actuator compatibility is broader than connector or pin compatibility.
Smart Temp Australia
Smart Temp’s SZ-4 documentation specifies 24VAC damper connections as DO (drive open), C (common) and DC (drive closed). The SZ-4 supports both RJ12 and hard-wired damper connections. Its wiring diagram specifies a 24VAC actuator with a 300 mA maximum.
Ductair Motor Wiring Reference
Ductair publishes a zone motor wiring reference covering multiple actuator manufacturers. It gives the same three-function arrangement for several 24VAC drive-open / drive-close motors, including Siemens, Belimo and NEAT:
- 0V
- OPEN
- CLOSE
This shows that OPEN / COMMON / CLOSE 24VAC control is not unique to one controller manufacturer.
The Polyaire ZoneMaster ZoneSwitch V2
The ZoneMaster ZoneSwitch V2 is common in Australian homes. Confirmed details from the installation manual:
- Supports up to 6 individual zones
- Uses a separate wall touchpad and a roof-mounted main control module
- Connects all dampers directly to the main module in a star arrangement
- Uses a 24VAC transformer
- Uses bright-green ZoneMaster damper motors
- Uses centre-latched plugs for damper motor cables
- Provides 24VAC, 50Hz zone outputs
- Specifies 200 mA per damper motor
The architecture looks like this:
ZoneMaster wall touchpad
|
| data/control cable
v
ZoneSwitch V2 main module
|
+---- Zone 1 -> 24VAC damper
+---- Zone 2 -> 24VAC damper
+---- Zone 3 -> 24VAC damper
+---- etc.The ZoneMaster dampers are standard 24VAC two-position motors. They are drive-open / drive-close actuators: they do not use a spring return. The motor drives the blade open and drives it closed. An internal limit switch opens the motor circuit when the blade reaches its end stop. The motor keeps its position until it is driven the other way.
This behaviour matches the OPEN / COMMON / CLOSE control standard exactly. In most cases the damper motors do not need replacement when you change the controller.
Replacing a ZoneSwitch V2 With a TekOnline Controller
TekOnline controllers also drive 24VAC dampers. With up to four zones, the 4-Zone Wall Controller works as a direct wall-mounted replacement. With more zones, the 8-Zone HVAC Controller V2 installs in the roof space next to the existing module.
Both controllers switch 24VAC through relay contacts. Each zone relay connects COMMON to either OPEN or CLOSE. This drives the motor in the required direction. At the end stop, the motor’s internal limit switch opens the circuit. The relay stays energised, but the motor draws no current. This is the correct wiring for drive-open / drive-close dampers. Spring-return dampers are also supported where fitted.
Before you connect, verify three things:
- The damper is a 24VAC two-position motor (OPEN / COMMON / CLOSE).
- The damper current is within the controller rating.
- The wiring and connector pinout match the controller output.
For a full side-by-side comparison, read the HVAC Zone Controller Compatibility Matrix.
Summary
- 24VAC two-position dampers use OPEN, COMMON and CLOSE control.
- Compatibility follows the electrical standard, not the connector or pinout.
- RJ12 pinouts vary between manufacturers. Verify wiring before connection.
- ZoneMaster ZoneSwitch V2 dampers are drive-open / drive-close motors with internal limit switches.
- TekOnline controllers drive 24VAC dampers up to the relay rating.
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