hexa CONTROLS RT226-J29 Digital Thermostats Instruction Manual

hexa CONTROLS RT226-J29 Digital Thermostats

Product Information

Product Name: Hexa Controls RT226-J29 Modulating Digital Thermostat

Installation and Operation Instructions:

Hexa Controls RT226-J29 modulating digital thermostats are designed to provide Proportional-Integral (PI) modulating control in 2-pipe fan coil units. This thermostat can provide modulating analog 0-10V or 0-20mA control signal.

Technical Data:

• Large LCD display with backlight
• Touch button easy for operation
• 3-speed fan control
• Maintains the temperature within 0.5 degree set point
• Permanent user setting retention during power loss, no batteries are required
• RS485 communication
• External sensor or internal sensor option
• 7-day programmable
• Filter dirty alarm
• Key lock

IMPORTANT SAFETY INFORMATION:

• Always turn off power at the main power source by unscrewing fuse or switching circuit breaker to the off position before installing, removing, cleaning, or servicing this thermostat.
• Read all of the information in this manual before installing this thermostat.
• Only a professional contractor should install this thermostat.
• All wiring must conform to local and national building and electrical codes and ordinances.
• Use this thermostat only as described in this manual.

Product Usage Instructions:

1. Turn off power at the main power source.
2. Follow the installation instructions provided in the manual.
3. Ensure all wiring is done according to local and national building and electrical codes and ordinances.
4. Turn on power and configure the thermostat settings using the large LCD display and touch buttons.
5. Select the desired fan speed (3-speed options available).
6. Set the desired temperature within 0.5 degree accuracy.
7. Choose between using an external sensor or internal sensor for temperature measurement.
8. Program the thermostat for a 7-day schedule if desired.
9. Monitor the filter dirty alarm to ensure proper maintenance.
10. Lock the keypad if necessary using the key lock feature.

Hexa Controls RT226-J29 modulating digital thermostats are designed to provide Proportional-Integral (PI) modulating control in 2-pipe fan in coil units. This thermostat can provide modulating analog 0-10V or 0-20mA control signal.

Technical Data

• Power……220V AC 50Hz/60Hz
• Temperature setting range………5C -50C
• Temperature display range……..OC -60C
• Setting accuracy……0.5C
• Display accuracy……….0.1C
• Ambient temperature-operation……..OC ~+50C
• Ambient temperature-transport. .-10C ~+60C

Features

• Large LCD display with backlight
• Touch button easy for operation
• 3-speed fan control
• Maintains the temperature to within 0.5 degree set point
• Permanent user setting retention during power loss, no batteries are required
• RS485 communication
• External sensor or internal sensor option
• 7 day programmable
• Filer dirty alarm
• Key lock

IMPORTANT SAFETY INFORMATION:

• Always turn off power at the main power source by unscrewing fuse or switching circuit breaker to the off position before installing, removing, cleaning, or servicing this thermostat.
• Read all of the information in this manual before installing this thermostat. Only a professional contractor should install this thermostat.
• All wiring must conform to local and national building and electrical codes and ordinances.
• Use this thermostat only as described in this manual.

Button and Display

Thermostat Buttons and Switches

1. Display area
2. Power button(Short press to switch off thermostat;Long press into permanent hold mode in power on mode; Exit button)
3. Fan speed option button (HI MED LOW AUTO)
4. Menu button/time button/programmable button(Short press to set time;Long press to set programmable)
5. Raise button
6. Lower button

The Display

1. Indicates thermostat is “calling” for cooling
2. Indicates cooling mode
3. Indicate filter dirty alarm
4. Indicates room card activate
5. Indicates fan status
6. Indicates room temperature/ setting temperature/time
7. Indicates programmable
8. Indicates week
9. Indicates No. in configuration
10. Indicates setting mode
11. Indicates permanent mode
12. Indicates time setting
13. Indicates key lock
    • (11) and (12) show in same time mean it’s in temporary hold mode
    • (10) and (12) show in same time mean it’s in programming setting

INSTALL THE THERMOSTAT

1. Gently opening the front panel by screw driver at the bottom open mouth. Gently pulling the control panel straight off the base connector.
2. To screw for mounting thermostat in the wall.
3. Fix the cover on the base.

WIRING DIAGRAM

Thermostat Function Description

Cooling mode
(Proportional-Integral(PI) control cooling)
Example: P-band is 2°C
The valve cooling output PI and the temperature differential(room temperature and setting temperature) as following picture.

Fan speed instruction

• Continuously press button, you can select HI speed, MED speed, LOW speed and AUTO speed, the LCD will display the corresponding marks. If you select the AUTO speed:
• Room temperature is higher or equal 3 ‘C than the setting temperature, the fan will run HI speed; if the room temperature is higher or equal 2 °C and lower or equal 3°C than the setting temperature, the fan will run MED speed. Other will run LOW speed.
• If you choose fan run with valve in parameter 6 of configuration,the Auto fan would stop if cooling valve close

External sensor

• When the external sensor is connected, the thermostat will show temperature detected by the external sensor.
• When the external sensor is removed or open the circuit, the thermostat will show temperature detected by the ambient sensor.

Key lock
In power-on status long press the button to activate key lock or cancel the button lock. With different key lock options, refer to parameter LF.

Room card

• If a room card is not present,it could set the default setting temperature from the configuration menu by parameter 9.
• If the room card activates, it could set energy-saving temperature from the configuration menu by parameter 10.

Configuration Menu operation

• The configuration menu allows you to set certain thermostat operating characteristics to your system or personal requirements. Switch off the thermostat, long press button or more than 3 seconds to enter the configuration menu, The display will show the first item in the configuration menu. Press  button to shift to the next menu item, use or to select. To exit the menu, pressing power button to switch off the thermostat.
• Thermostat will exit the configuration menu if no buttons are pressed within 20 seconds. The configuration menu chart summarizes the configuration options. In implicit parameter menu mode, long press button for 3 seconds, all parameter will back to the initial value. An explanation of each option as follows:

Programmable Setting
Long press over 3 second in power on it run into programmable setting menu (Keep you chose 5+2 programmable ‚S+1+1 programmable or 7 days programmable) Press to set time/adjust temperature.Press to go to next step.Press  to save what you setting and exit. Excel 1 (7 days programmable factory setting)

RS-485 MODBUS universal interface protocols

Basic description

Read the thermostat frame format
Command frame (give by upper computer) : Read the conditioner state

Air conditioning state instructions

Read the thermostat frame format

Command frame Read the thermostat ON/OFF state

Response frame (give by thermostat)

ON/OFF state value: 0000 – Fan coil OFF, 0001 – Fan coil ON

Command frame 2 : Read the thermostat mode state

High byte XX: 01 Low byte YY:2c 0x012c= 300 (setting temperature only can be the multiple of 5, the range is 50~350) setting temperature is 30.0 C

CUSTOMER ASSISTANCE
After reading this guide, if you have any question about the operation of your thermostat, please contact your installer or service provider.

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