Owon PCT503-Z User manual

PCT503-Z Multi-stage Thermostat
Quick Start Guide

Overview of this guide
Part 2 Get to know your device
Part 1 Welcome
Part 4 Further setup your device
Part 3 Installation Guide
Part 5 FAQ
Part 6 Technical specifications
Part 7 Safety Handling
Page3 The things you need to know
Page3 A brief introduction to the smart thermostat
Page4 LED status
Page22-23 Connect to your gateway
Page23-26 Overview of your device
Page5 Two products in the box
Page6-7 Check your old thermostat, and choose the guide you needed. Then
install your device with wires
Page8-10 Guide 1. With a C-wire
Page11-17 Guide 2. Without a C-wire(Optional)
Page18-20 Wiring diagrams
Page26 Connection failure
Page27-29
Page30-31

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Welcome
1
The PCT503-Z makes it easier to control your household temperature. It is
designed to work with the ZigBee gateway so that you could remotely control
the temperature anytime through your mobile phone. You can schedule your
thermostat working hours so it will work based on your plan.
This guide will provide you with an overview of the product and will help you
understand how to use it.
Get to know your device
2
Knob
LED indicator
A button
B button
C button
Knob
Rotate to choose from different given options, press to select.
A button
Time and date. Press to show time and date.
B button
Away/Home mode. Press to switch between Away and Home mode.
C button
Permanent hold. Press to enter "Permanent hold" mode. Hold current target
temperature regardless of the schedule.This will over ride the current schedule

4
settings.This function is not available when your device is in “Away” mode.
LED status
The LED status gives the following information of the thermostat:
LED status What it means
Red LED flashing The device has not joined a network.
Alternately flashing in RGB Thermostat initializing.
Green solid on Entering update mode.
Green LED flashing In the process of updating.
No light The device has joined a network.

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Installation Guide
PCT503-Z Multi-stage thermostat
Wiring Module SWB511 (Optional)
Y
G
3.1. In the box
3

6
3.2. Thermostat installation
Step 1. Switch off your HVAC system
Before you start, please switch off your HVAC system. Adjust the temperature in
your old thermostat to double check the system is off.
Step 2. Remove the old thermostat
Remove the old thermostat cover from the wall, keep the wallplate with wires.
Do not remove
the wallplate Old thermostat
Cover
Step 3. Check the old Thermostat's backplate
If you find a thick wire with wire nuts, or if your old system is using 120v or 240v,
it will not be compatibled with PCT503. If all good, please continue to the next
step.

7
Step 5. Label the Wires with Tags
Carefully disconnect and label the wires from your old themostat one wire at a
time, using the label (label 1 )provided.
Step 4. Take a photo
Take a picture of the wires connected to the terminal of your old thermostat. You
may need to reference this photo later on.
Terminal designation:
Terminals What it means
RC 24VAC primary for cooling
RH 24VAC primary for heating
W1 1st stage Primary heating relay / Aux heat
W2 2nd stage Secondary heating relay / Aux heat
Y1 1st stage Primary cooling compressor contactor
Y2 2nd stage Secondary cooling compressor contactor
GFan relay
C24VAC common*
O/B Changeover valve for heat pumps
SWiring Module Connection
*Multiple use reserved, including but not limited to: emergency heat
line, humidifier control

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Guide 1: Install the thermostat with a C-wire
Step 1. Remove the old thermostat base
Unscrew the old thermostat base from the wall, gently pull it out and ensure the
wires will not fall back into the hole.
Note:Do you have a C wire connected to your old thermostat?
YES →Guide 1. NO→Guide 2.
Step 2. Attach the base of PCT503 to the wall
Bundle and insert the wires through the hole of the thermostat base, then attach
the base to the wall with the screws.

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Step 3. Connect Wires
Connect wires to the corresponding terminal in the base. Take a picture of the
wires when you finished. You may need to refer it for the wirings in the setup
wizard later on.
Do you have more than one R wire(R, RC, and RH)?
NO：
R, RC, or RH wire into the RC terminal
R or RC wire into the RC terminal
RH wire into the RH terminal
YES：
Step 4. Switch the DIP
Switch the DIP switch on the back of the thermostat to RC if you have connected
both the RC-wire and the RH-wire to the wallplate, otherwise switch it to the
RC&RH side.
DIP switch

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Step 6. Power on your system
Congratulation, the installation is finished. Please power on your HVAC system.
Step 7. Setup the thermostat
Follow the instructions on your smart thermostat to complete the setup. You can
use the picture you took to help you remember the wiring（turn to page18).
Step 5. Attach the PCT503 to the base
Gently press the PCT503 into the base until it clicks.

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Guide 2: Install the thermostat without a C-wire
(Optional)
CHECKPOINT: 3 OR 4 WIRES
The wiring module requires your system to have the following wires:
4 wires: W/W1, Y/Y1, G, and R (or Rc or Rh)
or 3 wires: Y/Y1, G, and R (or Rc or Rh)
If you don't have those wires, your system might not be compatible.
Please contact the local dealer.
Wiring module
Install the wiring module to use the exiting wires to power your thermostat.

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Step 1. Find the HVAC terminals
Find the control board of your HVAC system.Take a picture of the wires
connected to the terminals of your old thermostat. You may need to reference
this photo later on.
To thermostat
Step 2. Label the wires
Use the tags provided (label 2) to label the wires from the control board to the
thermostat.

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Step 3. Disconnect the wires
Disconnect the R/RC, W, Y, G wires from the control board.
Step 4. Connect the wiring module
Reconnect them correspondingly to the 4 terminals side of the wiring module.
R/RC/RH→RC W/W1→W G→C Y/Y1→S

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Step 6. Close the HVAC cover panel
Close the HVAC cover panel securely and reture to your thermostat.
Step 7. Remove the old thermostat base
Unscrew the old thermostat base from the wall, gently pull it out and ensure the
wires will not fall back into the hole.
Pre-wired, to control panel
Step 5. Connect the wires
Generally the control board will have R, G, Y, W, C terminal, connect the pre-wired
side of the wiring module (5 terminals) to the corresponding terminals.

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Step 8. Attach the base of PCT503 to the wall
Bundle and insert the wires through the hole of the thermostat base, then
attach the base to the wall with the screws.
Step 9. Attach the tags
Attach the tags provided(label 2 Thermostat) to the wires as shown below:
R/RC/RH→RC G
→C Y→S
Y/Y1
G
RH
s
C
W/W1

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Step 10. Connect the wires to the corresponding terminal
First, connect 3 wires as shown below：
RC C S
Then connect other wires to the corresponding terminal in the base. Take a
picture of the wires when you finished. You may need to refer it for the wirings in
the setup wizard later on.
Step 11. Switch the DIP
Switch the DIP switch on the back of the thermostat to RC if you have connected
both the RC-wire and the RH-wire to the wallplate, otherwise switch it to the
RC&RH side.
DIP switch

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Step 12. Attach the PCT503 to the base
Gently press the PCT503 into the base until it clicks.
Step 13. Power on your system
Congratulation, the installation is finished. Please power on your HVAC system.
Step 14. Setup the thermostat
Follow the instructions on your smart thermostat to complete the setup. You
can use the picture you took to help you remember the wiring.

18
Wiring diagrams
Below is the wiring diagrams for common HVAC equipments.
Conventional heating and cooling system
For dual heat and cooling system,
if applicable.
Remove the jumper for RC or RH, switch the DIP switch on the back of the
thermostat to RC if you have connected both RC-wire and RH-wire to the
wallplate, otherwise switch it to the RC&RH side.

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For dual heat and cooling system,
if applicable.
Remove the jumper for RC or RH, switch the DIP switch on the back of the
thermostat to RC if you have connected both RC-wire and RH-wire to the
wallplate, otherwise switch it to the RC&RH side.
Heat pump (air or geothermal) with auxiliary heat

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Boiler or radiant system with air handler and
conventional cooling or heat pump
For dual heat and cooling system,
if applicable.
Remove the jumper for RC or RH, switch the DIP switch on the back of the
thermostat to RC if you have connected both RC-wire and RH-wire to the
wallplate, otherwise switch it to the RC&RH side.
1For heat pump only.