O56002 - 04/12 - Subject to change.
© Belimo
Aircontrols (USA),
Inc.
800-543-9038
USA
866-805-7089
CANADA
203-791-8396
LATIN AMERICA / CARIBBEAN
LCD Electronic Thermostat
EXT-CF24-D202-AF, EXT-CF24-D402-AF
Overview of Functions
Slim type EXT-CF24-D202-AF and EXT-CF24-D402-AF thermostat provides the
foundation for modern fancoil applications.
Features
• Large LCD with blue backlight
• Stylish appearance with hidden buttons
• For 2 or 3 wires on-off controlled devices in 2-pipe FCU system (EXT-CF24-D202-
AF)
• For 2 wires on-off controlled devices in 4-pipe FCU system (EXT-CF24-D402-AF)
• 3 speed / auto-speed for fan controls
• Defrost - low temperature protection
• Temperature off-set adjustment
• Temperature / setpoint display selection
• Memory rentention
• Set point range adjustment
Technical Data
Nominal Voltage
24 VAC
Temperature Display Range
0…55°C [ <0°C : LO, >55°C : HI ]
Sensing Element & Control
NTC Thermistor, 100k ohm @ 25°C
System Switch
On/Off, Cooling/Heating
Fan Control Switch
High-Med-Low or Auto-speed
LCD Display
0.5 K increase/decrease
Setpoint Range
5…35°C
Body Material
Fire-retardant ABS
Electrical Ratings
Relay output contact 2A Resistive, 1A Inductive,
24 VAC 50/60 Hz
Fan switch
2A Resistive, 1A Inductive,
24 VAC 50/60 Hz
Control Signal
On/Off Control, 3-wires & spring return 2 wires
Cooling or Heating (2-pipe system)
Temperature Range
Operating: 0 to 45°C
Storage: 0 to 50°C
Protection Class
II
Wiring Connections
Terminal wiring 0.5 ... 1.5 mm2
Agency Approval
LV Directive
CE according to 2006/95/EC
EMC
CE according to 2004/108/EC
Ambient Humidity
max. 95% r.h., non-condensing
Weight
140 g
Dimensions (L x H x D)
86 x 86 x 14 (mm)
Degree of Protection
IP 30
Basic Features
Modes
On/Off - Cooling
/ Heating
Fan speed
3 speed ( Low
, Medium
, High
) / Auto
Auto speed: difference between setpoint and ambient temperature,
1 K - Low
; 2 K - Medium
; 3 K - High
Defrost
Low temperature protection. When the unit in “OFF” status and
ambient temperature lower than 5°C, it will switch on automatically
in heat mode with “
” showing. When the temperature reached
7°C, it will stop automatically.
Backlight
The backlight will light up 7 seconds whenever button is pressed.
By pressing “
”, backlight light up 30 seconds.
Valve
When the valve is opening, the icon “
” displays.
Restart
When “RST” button is pressed, the thermostat will restart with last
saved setting.
Memory
All last saved parameters will be kept after power failure or power off.
Dimension and Terminals
24 VAC Neutral N (comm)
Output for fan - High speed
Output for fan - Medium speed
Output for fan - Low speed
Output for actuator - Cool
Output for actuator - Heat
24 VAC Live L
List Price
EXT-CF24-D202-AF
$90.00
EXT-CF24-D402-AF
$100.00
