RET-230-HC-3 Electronic Heat Cool Thermostat User Manual

RET-230-HC-3 Electronic Heat Cool Thermostat User Manual

Installation Instructions User Instructions

Installation Instructions

Please note
This product should only be installed be a suitably qualifi ed electrician or heating installer. The installation must comply with local Building Regulations and wiring Regulations, including any competent person requirements that may exist

Specification

Thermostat features

Temperature range, heating| 5-30°C
Temperature range, cooling| 7-32°C at dead-band of 2K 9-34°C at dead-band of 4K
Selectable dead-band| 2 or 4K
Manual fan speed selector| ●
Thermostat off/auto & fan on selector| ●
Power supply| 230 Vac ± 15%, 50/60Hz
Relay outputs, heat, cool & fan| 3 x SPST, 3(1)A, 10-230 Vac,Type 1B
Dimensions (mm)| 110 wide x 90 high x 40 high
Design standard| EN60730-2-9
Rated impulse voltage| 2.5Kv
Ball hardness test| 75°C
Control pollution situation| Degree 2
Temperature accuracy| ±1°C

Product overview

The thermostat is primarily designed for use in systems equipped with 4-pipe fan-coil units. It may also be used in other heat / cool systems, including split systems and air to air heat-pumps.

The thermostat controls room temperature by sequencing the operation of heating and cooling. A selectable dead-band prevents overlap of heating and cooling processes. For systems equipped with compressor derived cooling, including heat-pumps, a selectable compressor delay timer is also  included. If used to control a heat-pump, the reversing valve can be generalisation on either a heat or cool demand.

Installation

• First remove the wall plate from the back of the unit.
  

• Ensure that there is a minimum of 50mm above the unit and 100mm below the unit in order to mount the plug-in module.

• Fix at a height of approximately 1.5m from the floor, away from draughts or heat sources such a fan-coil outlets, sunlight or office equipment.
  

Wiring

4-pipe fan coil application

Note:
If HEAT/COOL/FAN outputs are 230V, link terminals L – COM

Heat-pump application

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Note:
If HEAT/COOL/FAN outputs are 230V, link terminals L – COM

Commissioning

Prior to re-fitting the thermostat to the wall plate, the DIL switches on the rear of the unit must be set to the desired setting.

DIL Switch options, shown in factory set position ON

DIL Switch descriptions

Switch 8 : If set to On/Off, both heating and cooling stages operate in on/off mode. If set to Chronic, heating stage operates in chronic-proportional modes, cooling continues in On/off mode

Switch 7: Active only if switch 8 is set to Chrono. This switch determines the number of cycles per hour that the thermostat will impose on the system, the options are three 20 minute cycles or six 10 minute cycles

Switch 6 : Allows Celsius or Fahrenheit temperature scaling to be selected

Switch 5: Enables or disables a compressor delay timer which is activated at the end of each cooling call.
This feature need only be used where cooling is provided by a compressor as opposed to chilled water. Set to Cmp del if a compressor delay is required, otherwise leave set to No Cmp del

Switch 4: Active only if switch 5 is set to Cmpdel. The options are 3 or 4 minutes

Switch 3: Allows dead-band between heating and cooling to be set, options are 2°C or 4°C

Switch 2: Allows application to set as fan coil or as heat pump. If heat- pump is selected, the output normally used to operate the heating valve is re- assigned to the heat-pump reversing valve, the compressor stop/start signal for both heat and cool calls is re-assigned to the relay normally used to operate the cooling valve

Switch 1: The function of this switch is dependent upon the setting of switch 2:

• Switch 2 set to Heat-pump: allows the reversing valve to be set up to be energised in heating mode (R+), or energised in cooling mode (R-)

Mounting thermostat to the wall plate

• To mount the thermostat to the wall plate, align the tabs on the top of the thermostat with the apertures in the wall plate and hinge the thermostat down, pressing firmly to engage the securing clip in the wall plate.
  

Locking & limiting

• To lock or limit the setting range turn the setting dial to 3 and remove knob.
• Position the locking springs on the rear of the dial to the desired position and re-mount the knob ensuring that number 3 on the dial aligns with the reference mark on the case.
  

1. LED lit green when thermostat is powered
   LED lit orange when fan running
   Fan runs continuously
   Fan runs with heat or cool demand
   Thermostat off

2. LCD display, shows actual room temperature unless knob is moved at which time a fl ashing set temperature is momentarily displayed. During heating demand a flame symbol is lit, during cooling demand a snowflake symbol is lit

3. LED lit red during heating demand
   LED lit green when cooling demand.
   LED fl ashes green during compressor delay period

4. RESET button

5. Temperature setting dial, read setting off LCD display
   

Note: Should it be necessary to reset the microprocessor for any reason, a reset button is located beneath the setting dial. Use a non-metallic point, for example a match- stick to depress the recessed button.

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