Hexa Controls RT226-J29 Modulating Digital Thermostat Installation and operation instructions

Hexa Controls RT226-J29 Modulating Digital Thermostat

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

• Power………………………………………………………………………….220V AC 50Hz/60Hz
• Temperature sett൴ng range……………………………………………………..5C -50C
• Temperature d൴splay range……………………………………………………..0C -60C
• Setting accuracy………………………………………………………………0.5C
• Display accuracy…………………………………………………………………………………….0.1C
• Ambient temperature-operat൴on……………………………………………….0C ~+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

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

The Display

• Indicates thermostat is “calling” for cooling
• Indicates cooling mode
• Indicate filter dirty alarm
• Indicates room card activate
• Indicates fan status
• Indicates room temperature/ setting temperature/time
• Indicates programmable
• Indicates week
• Indicates No. in configuration
• Indicates setting mode
• Indicates permanent mode
• Indicates time setting
• Indicates key lock
  • (11) and (12) show at same time meaning it’s in temporary hold mode
  • (10) and (12) show at same time meaning it’s in the programming setting

INSTALL THE THERMOSTAT

• Gently opening the front panel by screwdriver at the bottom open mouth. Gently pulling the control panel straight off the base connector.
• To screw for mounting thermostat in the wall.
• 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 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 external sensor connected, thermostat will show temperature detected by external sensor. When external sensor removed or open circuit, thermostat will show temperature detected by ambient sensor.

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

Room card
If room card is not present, it could set default setting temperature from configuration menu by parameter 9. If room card activate, it could set energy saving temperature from 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 buttons 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 to select. To exit the menu, press the power button to switch off the thermostat. The 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, and all parameters will back to the initial value. An explanation of each option is as follows:

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

Basic description

Command frame 1: Read the thermostat ON/OFF state

Byte l	Byte 2	Byte 3	Byte 4	Byte 5	Byte 6	Byte 7	Byte 8
Thermostat address	03(reado ut	00(start address)	00(start address)	00(regist er count)	0l(regist er count)	CRC low	CRC high
	comman	High	Low byte	High byte	Low byte
	d code)	byte

Response Franme Given By Thermostat 

Thermostat address

03 (command code)

02 (Bytes)

00(ON/OFF state high byte)

xx(ON/OFF state low byte)

CRC low

CRC high

Command frame 2: Read the thermostat mode state

Byte l

Byte 2

Byte 3

Byte 4

Byte 5

Byte 6

Byte 7

Byte 8

Thermostat	03(readou	00(start	0l(start	00(register	0l(registe	CRC	CRC high
address	t	address)	address)	count)	r count)	low
	command	High byte	Low byte	High byte	Low byte
	code)

Response Franme Given By Thermostat 

Byte l	Byte 2	Byte 3	Byte 4	Byte 5	Byte 6	Byte 7
Thermostat address	03 (command code)	02 (Bytes)	00(Mode status High byte)	xx(Mode status Low byte)	CRC low	CRC high

Command frame 3: Read the thermostat fan speed state

Byte l	Byte 2	Byte 3	Byte 4	Byte 5	Byte 6	Byte 7	Byte 8
Thermostat	03(readou	00(start	02(start	00(register	0l(registe	CRC	CRC high
address	t	address)	address)	count)	r count)	low
	command	High byte	Low byte	High byte	Low byte
	code)

Response Frame Given By Thermostat 

Byte l	Byte 2	Byte 3	Byte 4	Byte 5	Byte 6	Byte 7
Thermostat address	03 (command code)	02 (Bytes)	00 Fan speed High byte	xx Fan speed Low byte	CRC low	CRC high

Command frame 4: Read the thermostat setting temperature

Byte l	Byte 2	Byte 3	Byte 4	Byte 5	Byte 6	Byte 7	Byte 8
Thermostat	03(comman	00(start	03(start	00(register	0l(registe	CRC low	CRC high
address	d code)	address)	address)	count)	r count)
		High	Low byte	High byte	Low byte
		byte

Response Frame Given By Thermostat 

Byte l	Byte 2	Byte 3	Byte 4	Byte 5	Byte 6	Byte 7
Thermostat	03	02	xx (Setting	YY (Setting	CRC low	CRC high
address	(command	(Bytes	temperature)	temperature)
	code)	)	High byte	Low byte

Command frame 5: Read the thermostat proportional valve position

Byte l

Byte 2

Byte 3

Byte 4

Byte 5

Byte 6

Byte 7

Byte 8

Thermostat address

03(command code)

00(start address) High byte

04(start address) Low byte

00(registe r count) High byte

0l(registe r count) Low byte

CRC low

CRC high

Response Frame Given By Thermostat 

Byte l	Byte 2	Byte 3	Byte 4	Byte 5	Byte 6	Byte 7
Thermostat address	03 (command	02 (Bytes)	05(Proportional valve position)	xx(Proportion al valve	CRC low	CRC high
	code)		High byte	position)
				Low byte

Command frame 6: Read the thermostat current temperature value

Byte l	Byte 2	Byte 3	Byte 4	Byte 5	Byte 6	Byt e 7	Byte 8
Thermostat address	03(command code)	00(start address) High byte	05(start address) Low byte	00(registe r count) High byte	0l(registe r count) Low byte	CRC low	CRC high

Response Frame Given By Thermostat 

Byte l	Byte 2	Byte 3	Byte 4	Byte 5	Byte 6	Byte 7
Thermostat	03	02	xx(current	YY( current	CRC low	CRC high
address	(command	(Bytes)	temperature	temperature t
	code)		value)	value )
			High byte	Low byte

Command frame 7: Read the thermostat external sensor’s temperature

Byte l	Byte 2	Byte 3	Byte 4	Byte 5	Byte 6	Byte 7	Byte 8
Thermostat address	03(command code)	00(start address) High byte	06(start address) Low byte	00(register count) High byte	0l(register count) Low byte	CRC low	CRC high

Response Frame Given By Thermostat 

Byte l	Byte 2	Byte 3	Byte 4	Byte 5	Byte 6	Byte 7
Thermostat	03	02	xx(external	YY( external	CRC low	CRC high
address	(command	(Bytes)	sensor’s	sensor’s
	code)		temperature )	temperature)
			High byte	Low byte

Command frame 8: Read the thermostat room card status (DC is 0)

Byte l	Byte 2	Byte 3	Byte 4	Byte 5	Byte 6	Byte 7	Byte 8
Thermostat	03(command	00(start	07(start	00(register	0l(register	CRC	CRC

address

code)

address) High byte

address) Low byte

count) High byte

count) Low byte

low

high

Response Frame Given By Thermostat 

Byte l	Byte 2	Byte 3	Byte 4	Byte 5	Byte 6	Byte 7
Thermostat address	03 (command code)	02 (Bytes)	00( room card status) High byte	x(room card status) Low byte	CRC low	CRC high

Command frame 9: Read filter dirty status(DC is 2)

Byte l	Byte 2	Byte 3	Byte 4	Byte 5	Byte 6	Byte 7	Byte 8
Thermostat address	03(command code)	00(start address) High byte	08(start address) Low byte	00(register count) High byte	0l(register count) Low byte	CRC low	CRC high

Response Frame Given By Thermostat 

Byte l	Byte 2	Byte 3	Byte 4	Byte 5	Byte 6	Byte 7
Thermostat address	03 (command code)	02 (Bytes)	xx(filter dirty status) High byte	YY( filter dirty status) Low byte	CRC low	CRC high

Command frame 10: Read the fan running status

Byte l	Byte 2	Byte 3	Byte 4	Byte 5	Byte 6	Byte 7	Byte 8
Thermostat address	03(command code)	00(start address) High byte	09(start address) Low byte	00(register count) High byte	0l(register count) Low byte	CRC low	CRC high

Response Frame Given By Thermostat 

Byte l	Byte 2	Byte 3	Byte 4	Byte 5	Byte 6	Byte 7
Thermostat address	03 (command code)	02 (Bytes)	xx(fan status ) High byte	YY( fan status) Low byte	CRC low	CRC high

Command frame 11: Read the thermostat ON/OFF state

Byte l	Byte 2	Byte 3	Byte 4	Byte 5	Byte 6	Byte 7	Byte 8
Thermostat address	03(reado ut	00(start address)	0A(start address)	00(regist er count)	0l(regist er count)	CRC low	CRC high
	comman	High	Low byte	High byte	Low byte
	d code)	byte

Response Frame Given By Thermostat 

Thermostat address

03 (command

02 (Bytes)

00(ON/OFF state high

xx(ON/OFF state low

CRC low

CRC high

code)

byte)

byte)

Command frame 12: Read the thermostat fan speed state

Byte l	Byte 2	Byte 3	Byte 4	Byte 5	Byte 6	Byte 7	Byte 8
Thermostat	03(readou	00(start	0B(start	00(register	0l(registe	CRC	CRC high
address	t	address)	address)	count)	r count)	low
	command	High byte	Low byte	High byte	Low byte
	code)

Response Frame Given By Thermostat 

Byte l	Byte 2	Byte 3	Byte 4	Byte 5	Byte 6	Byte 7
Thermostat address	03 (command code)	02 (Bytes)	00 Fan speed High byte	xx Fan speed Low byte	CRC low	CRC high

Command frame 13: Read thermostat setting temperature

Byte l	Byte 2	Byte 3	Byte 4	Byte 5	Byte 6	Byte 7	Byte 8
Thermostat	03(comman	00(start	0C(start	00(register	0l(registe	CRC low	CRC high
address	d code)	address)	address)	count)	r count)
		High	Low byte	High byte	Low byte
		byte

Response Frame Given By Thermostat  

Byte l	Byte 2	Byte 3	Byte 4	Byte 5	Byte 6	Byte 7
Thermostat	03	02	xx (Setting	YY (Setting	CRC low	CRC high
address	(command	(Bytes	temperature)	temperature)
	code)	)	High byte	Low byte

Set the thermostat frame format

Command frame 1 (give by upper computer) set the thermostat ON/OFF

Byte l	Byte 2	Byte 3	Byte 4	Byte 5	Byte 6	Byte 7	Byte 8
Thermostat address	06(com mand code)	00(start address) High byte	00(start address Low byte)	00(Setting value high byte)	xx(Setting value low byte)	CRC low	CRC high

Command frame 2 (give by upper computer) set the mode

Byte l

Byte 2

Byte 3

Byte 4

Byte 5

Byte 6

Byte 7

Byte 8

Thermostat address

06(com mand code)

00(start address) High byte

0l(start address Low byte)

00(Setting value high byte)

xx(Setting value low byte)

CRC low

CRC high

Command frame 3 ( give by upper computer) set the fan speed

Byte l	Byte 2	Byte 3	Byte 4	Byte 5	Byte 6	Byte 7	Byte 8
Thermostat address	06(com mand code)	00(start address) High byte	02(start address Low byte)	00(Setting value high byte)	xx(Setting value low byte)	CRC low	CRC high

Command frame 4 ( give by upper computer) set the setting temperature

Byte l	Byte 2	Byte 3	Byte 4	Byte 5	Byte 6	Byte 7	Byte 8
Thermostat	06(com	00(start	03(start	xx(Setting	YY(Setting	CRC low	CRC
address	mand	address)	address	temperature	temperature		high
	code)	High	Low byte)	high byte)	low byte)
		byte

REFERENCE:

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Hexa Controls RT226-J29 Modulating Digital Thermostat Installation and Operation instructions

Hexa Controls RT226-J29 Modulating Digital Thermostat Installation and Operation instructions