CRCT230HC3 &
CRCT230HC3A
Electronic Heat / Cool thermostat
with auto-changeover
GB
Installation Instructions
User Instructions
GB
Index
Installation Instructions 3-8
User Instructions 9
Installation Instructions
2
3
Installation Instructions
Please note
This product should only be installed by 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
GB
Product Specifi cation
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
O
O
Installation Instructions
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
GB
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 deadband prevents overlap of heating and cooling processes. For
systems equipped with compressor derived cooling, including
heat-pumps, a selectable compressor delay timer is also
Installation Instructions
included. If used to control a heat-pump, the reversing valve
can be energisation on either a heat or cool demand.
Installation
• First, remove the wallplate 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 fl oor, away
from draughts or heat
sources such a fan-coil
outlets, sunlight or
offi ce equipment.
4
5
Wiring
X SEN
X SEN
N
L
FAN
3
FAN
2
FAN
1
COM
HEAT/
RV
COOL/
COMP.
3 SPEED
FAN
ELECTRONICS
N
COOLING OUTPUT
HEATING OUTPUT
COMMON IN
(LIVE IN)
REMOTE
SENSOR
('A' MODELS ONLY)
230 VAC
FIXED 3A
N
L
N
L
FAN
3
FAN
2
FAN
1
COM
HEAT/
RV
COOL/
COMP.
ELECTRONICS
N
COMPRESSOR
REVERSING VALVE
COMMON
(LIVE IN)
REMOTE
SENSOR
('A' MODELS ONLY)
230 VAC
FIXED 3A
X SEN
X SEN
3 SPEED
FAN
4-pipe fan coil application
GB
Note:
If HEAT/COOL/FAN
outputs are
230V, link terminals
L - COM
Installation Instructions
Heat-pump application
Note:
If HEAT/COOL/FAN
outputs are
230V, link terminals
L - COM
GB
ON
On/Off
Chrono
Chrono 3Chrono 6
°C
°F
No Comp Del
Comp Del
3 Minutes
4 Minutes
DB 2°C/4°F
DB 4°C/8°F
Fan Coil Heat Pump
RV-
RV+
Sw On
1
2
3
4
5
6
7
8
Commissioning
Prior to re-fi tting the thermostat to the wallplate, the DIL switches on
the rear of the unit must be set to the desired setting.
Installation Instructions
DIL Switch options, shown in factory set position.
DIL Switch descriptions
Switch 8: If set to On/Off, both heating and cooling stages
operate in on/off mode. If set to Chrono, heating
stage operates in chrono-proportional modes,
cooling continues in On/off mode
6
7
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.
GB
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 Cmp del. 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
Installation Instructions
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 reassigned 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-)
GB
Mounting thermostat to the wallplate
• To mount the thermostat to the wallplate, align the tabs on
the top of the thermostat with the apertures in the wallplate
and hinge the thermostat down, pressing fi rmly to engage
the securing clip in the wallplate.
Installation Instructions
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.
8
9
GB
button
RESET
Fan speed 3
Fan speed 2
Fan speed 1
LED lit red during heating
demand
LED lit green when cooling
demand.
LED fl ashes green during
compressor delay period
User Instructions
Temperature setting dial,
read setting off LCD display
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
fl ame symbol is lit, during cooling demand a snowfl ake symbol is lit
Fan runs continuously
Fan runs with heat or
cool demand
Thermostat off
LED lit green when
thermostat is powered
LED lit orange when
fan running
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 matchstick, to depress the recessed button.
101112
www.danfoss.com/BusinessAreas/Heating
This product complies with the following EC Directives:
Electro-Magnetic Compatibility Directive.
(EMC) (2004/108/EC)
Low Voltage Directive.
(LVD) (2006/95/EC)
Part No 3448v01 08/08
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