HEXA RT226-F8 User manual

RT226-F8 FCU THERMOSTAT
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Application: RT226-F8 is a versatile room controller for individual room temperature and VAV control
applications. The bus is galvanically isolated from the controller's other electronics. The controller has a display
and touch buttons for commissioning the controller and adjusting the user parameters, temperature set point, for
example.
Technical Specification
Supply Voltage：24（18-30）VAC 50HZ/60Hz
Temperature setting range：5℃-45℃
Accuracy：0.1℃
Temperature display range：0℃-60℃
Control type：PID
Ambient temperature-operation：0℃-50℃
Ambient temperature-transport：-10℃-60℃
Temperature input: thermostat built-in sensor and external sensor（NTC10K B3977）
Features
℃/℉optional
Cool, heating, auto three mode optional, PID output control
DC electrodeless fan speed adjustable，automatic and manual control type optional，show the fan speed and
opening percents
Display shows both set points and room temperature simultaneously
Separately heating and cooling temperature setting
Permanent user setting retention during power loss, no batteries are required
Remote control
Button and Display
Thermostat Buttons and Switches
①Display area
②System button (COOL, HEAT , AUTO mode)
③Fan speed option button (HI MED LOW AUTO)
④Raise button
⑤Lower button
⑥Power button
RT226-F8 Digital Thermostat User Manual

RT226-F8 FCU THERMOSTAT
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Match with the RT226-F8
remote control / Optional
The Display
①Shows working mode
②Shows setting temperature
③Shows measure temperature
④Shows sleep mode
⑤Temperature unit mark
⑥Shows fan speed option
⑦Shows fan rotate inAuto speed
⑧Shows fan speed option
⑨Shows heating output
⑩Shows cooling output
⑪Shows room card mode
⑫Shows child lock mark(At the same time
hold down the“▲” “▼”button more
than 3 seconds, the keypad locking,
conversely, unlock.)

RT226-F8 FCU THERMOSTAT
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Function Description
Cooling mode：Heating mode：
The relationship between the output PI and temperature difference ( room temperature and setting
temperature)
If we set the P-band is 2℃, when the room temperature is higher 2℃than the setting temperature, the terminal 11
will 100% output, the cooling equipment actuator will 100% open; when the room temperature is equal or lower
than setting temperature, the terminal 11 will stop output(0% output), the cooling equipment actuator will fully
close. The LCD will display the current output PI value.
Fan and the first section mark show 10-40%, fan and the second section mark show 41-70%, fan and the third
section mark show 71-100%.
The operation mode is total three: cooling, heating, auto。
After connecting the external sensor, in the auto mode, when the difference of the inlet air temperature and room
temperature is 5℃, the mode automatically switch。When the inlet air temperature is high 5℃than the room
temperature, it will switch to heating, if lower than 5℃, it will switch to cooling.
When in the auto mode, if the external sensor is not connected, it will switch to other mode forced（room
temperature is high than 25℃, it will be heating mode. Otherwise, it will be cooling mode）。
Room card function
When the terminal 12 and 13 connect with the room card input signal, the room card input signal control the
thermostat into the economical mode, show 。When in the economical operate mode, the setting
temperature is depended on the 8 item and 9 item in the initialize menu. The room card ON or OFF is still
depended on the 10 item of the initialize menu. The input of the room card is node signal, the maximum voltage is
5V DC。
Analog output choose the wire jumper
Open the thermostat，the cover of the wire jumper lie the below of the thermostat
As the following figure show，the analog output of the wire jumper’s choose.
0~10V output 4~20mAoutput
0~10V
4~20mA
0~10V
4~20mA

RT226-F8 FCU THERMOSTAT
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Configuration Menu
The configuration menu allows you to set certain thermostat operating characteristics to your system or personal
requirements. Switch off the thermostat, long press button more than 3 seconds to enter the configuration
menu, The display will show the first item in the configuration menu 1. 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.An explanation of each option as follows:
。
Item
Displayed
Description
Setting range
Factory
default
1
Temperature correction
-4°C —4°C
0
2
Temperature setting maximum
20°C —45°C
35
3
Temperature setting minimum
5°C —20°C
5
4
Temperature scale
C：Celsius degree
F：Fahrenheit degree
C
5
Backlight choose
1．OFF 2．Automatically ON 10S
3．ON all the time
2
6
Memorize option before power loss
rE: With memorize option before power
loss
rd: without memorize option before power
loss
rE
7
485 communicate address
1 —255
1
8
Heating energy-saving temperature
10°C —18°C
18
9
Cool energy-saving temperature
25°C —30°C
25
10
Room card input
SC: with room card, activate the energy
mode by open circuit
OC: with room card, activate the energy
mode by close circuit
OO: without room card function
SC
11
Temperature display option
0: Show setting temperature and room
temperature
1: only show room temperature
2: only show setting temperature
0
12
Proportional band
1°C —10°C
5
13
Integral time
0min —10min
5
14
Temperature sensor control option
0: Return air temperature sensor active
1:Room temperature sensor active
2 :Mix temperature sensor active
2

RT226-F8 FCU THERMOSTAT
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INSTALLTHE THERMOSTAT
Installation：
Please cut off the power source before install, remove, clean or recondition the
thermostat.
Please read the use manual carefully before install the thermostat
Only the project company who has corresponding safety knowledge can install the
thermostat.
All of the connection must conform the national standard.
Please operate the thermostat In strict accordance with the user manual.
CUSTOMERASSISTANCE
After reading this guide, if you have any question about the operation of your thermostat, please contact
your installer or service provider.