OWON PCT504

Compatibility

Compatible with EpiSensor Edge over Zigbee.

Pair it with the Zigbee radio on an EpiSensor Gateway. Edge reads it locally on the Gateway.

Edge reads 20 values from it, listed under Interface.

Connect it with

• 
  Gateway ZGW-20
  From €899 ex VAT Configure Gateway

Specifications

The PCT504 replaces the wall thermostat on a fan coil unit. It drives the heating valve, the cooling valve and the fan at high, medium or low speed from its own relay terminals, and works with four-pipe heat and cool systems as well as two-pipe heat-only or cool-only systems. It has system modes for heat, cool, fan only and off, fan modes auto, low, medium and high, plus sleep and eco modes and an on/off schedule.^1, 3

Power

Mains. 110 to 250 V AC, 50/60 Hz, 1.4 W rated consumption, hardwired. A 12 V DC version is also made.³

Compatible systems

4-pipe heat and cool; 2-pipe heat only; 2-pipe cool only²

Outputs

Heating valve on/off, cooling valve on/off, fan high, medium and low³

Relay rating (12 V DC version)

3 A resistive, 1 A inductive²

Heating setpoint range

5 to 30 °C, 0.5 °C steps⁵

Cooling setpoint range

7 to 35 °C, 0.5 °C steps⁵

Temperature sensing range

0 to 46 °C²

Humidity sensing range

0 to 99 % RH²

Occupancy sensor

PIR, 6 m, 120°²

Temperature calibration

-4 to 4 °C³

Display

2.4 inch LCD, 128 × 64 pixels²

Wireless

Zigbee 3.0, 2.4 GHz IEEE 802.15.4, internal antenna²

Radio range

100 m outdoors, 30 m indoors, open area²

Dimensions

86 × 86 × 48 mm²

Weight

198 g²

Where it is used

• Fan coil control in hotel rooms and serviced apartments, setting rooms back to unoccupied setpoints when the PIR sees nobody.

  HVAC energy monitoring for commercial buildings

• Office floors with fan coil units, where room temperature, humidity and occupancy from each thermostat show which zones are conditioned while empty.

  Indoor environmental monitoring

• Retrofits where new control wiring back to a BMS is costly: each thermostat joins the Zigbee network instead.

Interface

Readings and settings, with units and ranges where OWON publishes them. R readable, R·W readable and writable.

Running mode reports whether the unit is heating, cooling or off, and running state adds fan only and idle. System mode also accepts sleep, which uses the thermostat’s own sleep behaviour.⁵

Programming operation mode switches between the normal setpoint and eco. The eco setpoints are set on the thermostat: 5 to 18 °C for heating, 15 °C by default, and 25 to 35 °C for cooling, 30 °C by default.^3, 4

Keypad lockout has two lock levels, lock1 and lock2, as well as unlock, for guest rooms where the controls should be limited or disabled.⁴

Setup

1. Wire it to the fan coil

   With the fan coil isolated, wire L and N, the fan speeds to G-h, G-m and G-l, the cooling valve to Y-on and Y-off and the heating valve to W-on and W-off. Mount it about 1.5 m above the floor, away from outside walls, radiators and direct sun.³

2. Open pairing in Edge

   In Edge, open pairing on the Gateway’s Zigbee network.

3. Power it on

   Switch on the thermostat. It joins the open network by itself, and the X on the network indicator at the top right of the screen disappears when it has joined.³

4. If it does not join, reset it

   Turn the thermostat off, then hold the Sleep and Eco buttons together for 5 seconds until the screen lights. It returns to the main screen when the reset is done.³

5. Check one reading and one setting

   Confirm Edge identifies it as OWON PCT504 and compare temperature and humidity with a reference instrument. Then change the system mode and fan mode from Edge and check the fan coil follows.

Common questions

Does the PCT504 need an OWON gateway to work with Edge?

No. It is a Zigbee 3.0 device, so it joins the Zigbee radio on an EpiSensor Gateway directly, without an OWON gateway or cloud.^1, 2

Does it work with two-pipe fan coils?

Yes. It supports four-pipe heat and cool systems and two-pipe systems that are heat only or cool only. The guide has a wiring diagram for each.^2, 3

Which supply voltage do I need?

OWON makes a 110 to 240 V AC version for fan coils wired at mains voltage and a 12 V DC version for low-voltage projects. Check the label before wiring; the terminal layout in the guide is for the mains version.^1, 3

Can the fan stop when the valve closes?

Yes. Setting P5 in the thermostat’s menu ties the fan to the valve output, so the fan stops when the valve closes. It is off from the factory, so the fan runs independently.³

How does occupancy save energy?

The PIR reports occupancy to Edge, and the thermostat holds separate occupied and unoccupied setpoints for heating and cooling as well as an eco mode. An automation in Edge can switch an empty room to eco or to wider setpoints and back again when someone returns.^2, 5