RTH21 Programmable Thermostat Coldbuster Dual Instruction Manual

RTH21 Programmable Thermostat Coldbuster Dual

• Large Touch Screen
• Simple Programming
• Accurate Control
• 5+2 / 7 Day Schedules
• User-friendly Menu
• 2 Zones Programmable Heating

ADJUSTING THE PARAMETER VALUES

Note:
Only modify these parameters if it is essential.

ACCESSING PARAMETERS

Turn the thermostat off by pressing After turning the thermostat off, press

• Use or to adjust.
• Press to move to next menu.
• Press to store and exit.

1. Temperature calibration for Zone 1
   – 1°C = decrease 1°C , 1°C = increase 1°C …

2. Temperature calibration for Zone 2
   – 1°C = decrease 1°C , 1°C = increase 1°C …

3. 5+2 / 7 Day Program Option (default 01)

4. = 5+2 Day Program, 02 = 7 Day Program

5. Dual Options

6. set both zones as thermostats

7. set zone 1 as a thermostat and zone 2 as a timer

8. Reset
   This allows you to reset your thermostat to factory default. When your thermostat is turned off, press and hold
   for about 5 seconds until you see Menu 05.
   Press and hold until you see RES on screen.

SETTING THE TIME AND DAY

• Press , the time display will flash.
• Use to adjust.
• Press again, the day display will flash.
• Use to adjust.
• Press to store and exit

AUTO / MANUAL MODE

• Press to select Auto or Manual mode.
  Auto mode:
  Manual mode:

• In Manual mode, press to set the desired  temperature.

• In Auto mode, press to override the current programmed temperature until the next programmed period. will flash in this case.

LOCKING THE KEYPAD

To lock the keypad, press and hold for 5 seconds You will see To unlock, repeat the steps above and will disappear

TEMPORARY OVERRIDE

In Auto mode, press and the temperature display will flash.
Use to adjust.
Press to confirm.
will  flash on the screen.
Your thermostat will maintain the new setpoint until the next programmed period.
To cancel the override setting, press

SETTING THE OPERATING SCHEDULES

For 5+2 day programmable mode （default)
Default Settings

Changing programs for Monday- Friday

• Press , the time for  (Program 1) will flash.
• Use to adjust the time for Program 1.
• Press , the setpoint for Program 1 will flash.
• Use to adjust the setpoint for Program 1.
• Press , the time for (Program 2) will flash.
• Use to adjust the time for Program 2.
• Press , the setpoint for Program 2 will flash.
• Use to adjust the setpoint for Program 2.
• Repeat above steps for Program 3 and Program 4.

Changing programs for Saturday- Sunday

When Monday-Friday programs have been set, continue

• to press , the time for (Program 1) will flash.
• Use to adjust the time for Program 1.
• Press , the setpoint for Program 1 will flash.
• Use to adjust the setpoint for Program 1.
• Press he time for (Program 2) will flash.
• Use to adjust the time for Program 2.
• Press , the setpoint for Program 2 will flash.
• Use to adjust the setpoint for Program 2.
• Repeat above steps for Program 3 and Program 4.

Note:
For Saturday-Sunday, if you want to clear the time period of Program 2 and Program 3, Press during programing. Press again to cancel.

For 7 day programmable mode
Default Settings

• Press , the day display will start flashing.
• Use to select the day.
• Press and hold for about 5 seconds to
• select all 7 days of the week, and to cancel press and
• and hold for about 5 seconds again.
• Press , the time for (Program 1) will flash.
• Use to adjust the time for Program 1.
• Press , the setpoint for Program 1 will flash.
• Use to adjust the setpoint for Program 1.
• Press , the time for (Program 2) will flash.
• Use to adjust the time for Program 2.
• Press , the setpoint for Program 2 will flash.
• Use to adjust the setpoint for Program 2.
• Repeat above steps for program 3 and Program 4.

Note:
For Saturday-Sunday, if you want to clear the time period of Program 2 and Program 3, press during programing. Press  again to cancel.

LCD SYMBOLS

• power on / off
• mode button / menu button
• program button
• confirm the settings
• increase
• decrease
• auto mode
• flashing temporary override
• key lock symbol
• the heating is turned on
• the program numbers
• set temperature
• sensor not installed or error

TECHNICAL INFORMATION

SPECIFICATIONS

• SUPPLY VOLTAGE 230-240 VAC
• SWITCHING CAPABILITY 8A max for each zone
• TEMP RANGE(A) 5°C~35°C
• FLOOR SENSOR resistance default to 25°C 10 Ohm.
• IP RATING 30
• ORIENTATION VERTICAL

INSTALLATION

Carefully separate the front half of the thermostat from the back plate by placing a small flat head terminal driver into the slots on the bottom face of the thermostat. Carefully unplug the cable connector which is plugged into the front half of the thermostat.
Place the thermostat front half somewhere safe.
Follow the Wiring Diagram to connect the floor heating cold leads, floor temperature sensor and electrical supply to the appropriate terminals.
Screw the thermostat back plate onto the flush box. Re-connect the thermostat cable and clip the two halves back together.

DIMENSIONS

WIRING DIAGRAM

Note:

• Heater 1 refers to heating element in zone 1
• Heater 2 refers to heating element in zone 2
• Sensor 1 refers to sensor installed for zone 1
• Sensor 2 refers to sensor installed for zone 2

References

• Underfloor Heating & Electric Floor Heating | Coldbuster

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