Owon PCT503-TY User manual

PCT503-TY WiFi Multi-stage Thermostat
Quick Start Guide

2
Safety Handling
WARNING: Failure to follow these safety notices could result in fire, electric
shock, other injuries, or damage to the Thermostat and other property. Read all
the safety notices below before using the Thermostat.
• Avoid high humidity or extreme temperatures.
• Avoid long exposure to direct sunlight or strong ultraviolet light.
• Do not drop or expose the unit to intense vibration.
• Do not disassemble or try to repair the unit on your own.
• Do not expose the unit or its accessories to flammable
liquids, gases or other explosives.
FCC Statement
NOTE: This equipment has been tested and found to comply with the limits for
a Class B digital device, pursuant to part 15 of the FCC Rules. These limits are
designed to provide reasonable protection against harmful interference in a
residential installation. This equipment generates, uses and can radiate radio
frequency energy and, if not installed and used in accordance with the instructions,
may cause harmful interference to radio communications. However, there is no
guarantee that interference will not occur in a particular installation. If this
equipment does cause harmful interference to radio or television reception, which
can be determined by turning the equipment off and on, the user is encouraged to
try to correct the interference by one or more of the following measures:
- Reorient or relocate the receiving antenna.
- Increase the separation between the equipment and receiver.
- Connect the equipment into an outlet on a circuit different from that to which
the receiver is connected.
- Consult the dealer or an experienced radio/TV technician for help

3
Changes or modifications not expressly approved by the party responsible for
compliance could void the user’s authority to operate the equipment. This device
complies with Part 15 of the FCC Rules. Operation is subject to the following two
conditions:
- This device may not cause harmful interference, and
- This device must accept any interference received, including interference that
may cause undesired operation.

4
Technical specifications
Compatibility
Compatible systems
• 2-stage heater and 2-stage cooling HVAC
systems
• Supports natural gas, heat pump, electric, hot
water, steam or gravity, gas fireplaces (24 Volts),
oil heat sources
• Supports any combination of systems
Heat • Up to 2 stages
Cool • Up to 2 stages
Aux Heat • Up to 2 Stages
Heat Pump
• Up to 2 Stages
• 1 stage + 1 aux
• 1 stage + 2 aux
• 2 stage + 1 aux
• 2 stage + 2 aux
• Dual Fuel Heat Pump
• 4 stage heating (2 compressor, 2 aux heat), 2
stage cooling
Wireless Connectivity
Wi-Fi • Wi-Fi 802.11b/g/n 2.4GHz
Output Power • +3dBm (up to +8dBm)
Receive Sensitivity • -100dBm
OTA • Over-the-Air Upgradable via wifi

5
HVAC Control Functions
System Mode • Heat, Cool, Auto, Off, Emergency Heat (Heat
Pump only)
Fan Mode • On, Auto, Circulation
Advanced
• Local and remote setting of the
temperature
• Auto-changeover between heat and cool
mode (System Auto)
• Compressor short cycle protection delay of
2 minutes
• Failure protection by cutting off all circuit
relays thanks to the Super Capacitor
Auto Mode Deadband • 1.5° C, 3° F
Temp. Sensing Range • −10°C to 125°C
Temp. Resolution • 0.1° C, 0.2° F
Temp. Display Accuracy • ±1°C
Temp. Setpoint Span • 0.5° C, 1° F
Humidity Sensing Range • 0 to 100% RH
Humidity Accuracy • ±4% Accuracy through the range of 0% RH
to 80% RH
Humidity Response Time • 18 seconds to reach 63% of the next step
value

6
Physical Specifications
Embedded Platform • MCU: 32-bit Cortex M4; RAM: 192K; SPI
Flash: 16M
LCD Screen • 3.5” TFTColorLCD, 480*320 pixels
LED • 3-color LED (Red, Blue, Green)
Buttons • One rotary control wheel, 3 side-buttons
PIR Sensor • Sensing Distance 5m, Angle 30°
Speaker • Click sound
Data Port • Micro USB
DIP Switch • Power selection
Electrical Rating • 24 VAC, 2A Carry
Switches/Relays
• Latching type relay, 2A maximum loading
• 1. 1st stage control
• 2. 2nd stage control
• 3. 3rd stage control
• 4. Emergency Heating control
• 5. Fan Control
• 6. Heating/cooling Reverse Valve Control
• 7. Common
Dimensions • 160(L) × 87.4(W)× 33(H) mm
Mounting Type • Wall Mounting
Wiring • 18 AWG, Requires both R and C wires from
the HVAC System
Operating Temperature • 0° C to 40° C (32° F to 104° F)
Storage Temperature • -30° C to 60° C
Certification • FCC

Overview of this guide
Part 2 In the box
Part 1 Welcome
Part 4 Further setup your device
Part 5 Get started
Part 3 Installation Guide
Part 6 FAQ
Part 7 Support
Page8 Products in the box
Page25 Get to know your device
Page26 LED status
Page8 A brief introduction to the smart thermostat
Page27 Reset the device
Page28 APP installation
Page29-31 Add devices
Page32-35 Device overview
Page36-39 App overview
Page8-10 Check your old thermostat, and choose the guide you needed
Page11-13 Guide 1. With a C-wire
Page14-20 Guide 2. Without a C-wire (Optional)
Page21-23 Wiring diagrams
Page40-41 Only need to pair one device
Page42 How to share my device for family use?
Page42 Device-connection failure?
Page43 What if the device is offline?
Page43-44 Enable Alexa voice control
Page45

8
Welcome
1
The smart thermostat makes it easier to control your household temperature. You
can schedule your thermostat working hours so it will work based on your plan.
With a smart thermostat, you will be able to remotely control the temperature
anytime through your mobile phone.
This guide will provide you with an overview of the product and will help you
understand how to use it.
PCT503-TY smart thermostat
Wiring Module SWB511 (Optional)
Y
G
In the box
2

9
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.
Installation Guide
3

10
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

11
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.

12
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

13
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.

14
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.

15
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.

16
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

17
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.

18
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

19
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

20
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.