Danfoss FH-WS User manual

VDSGA122 © Danfoss 03/10
Data sheet FH-WS
Electronic Room Thermostat
1
Application:
Ordering
Information:
Accessories:
Technical Specifications:
The Danfoss FH-WS is a hard wired low voltage
electronic thermostat used with hydronic
heating systems. FH-WS is typically used to
control the operation of electrical zone valve
actuators in hydronic heating systems. The
thermostat senses air temperature and with
the addition of the optional floor sensor, it
is capable of floor temperature limitation.
Beneath the front cover flap is a LED that
illuminates when there is a heat demand.
Limitation tabs are built-in to allow the setting
of the minimum and maximum air temperature.
The thermostat provides a cost effective and
efficient means of controlling comfort within a
heated room.
Code No. Description Power Scale Temperature
Range Floor Sensor
088H0024 FH-WS
Electronic
Thermostat
24 VAC,
50-60Hz
°C 6° - 30°C
Optional
088H0034 °F 50° - 86°F
Code No. Description
088H0025 Optional floor sensor for FH-WS thermostat. Sensor provides minimum or
maximum regulation of floor temperature
Power Supply 24 VAC (50-60Hz)
Mounting Surface mounted
Wiring Requirements 3-wire, 4-wire if optional timer is used
Temperature Range 50° - 86°F (6° - 30°C)
Temperature Differential ± 1.75°F
Ambient Temperature 32° - 122° (0° - 50°C)
Freeze Protection 40°F (4°C)
Min. / Max. Floor Setting 68° - 113°F (20° - 45°C)
Night Setback Manual, (Automatic is possible with external timer -
not supplied)
Sensor FH-WS NTC, 30 ohms 68°F (20°C), with 10 ft (3m) cable*
*The floor sensor can be extended to a maximum length of 33 ft. A wire size of 18-gauge should be used as an extension to the
floor sensor.
Temperature Limitation: The setting range for the thermostat can be
limited by means of the blue and red limitation
rings located beneath the front cover. By setting
them the temperature range is reduced. The
settable limitation range is 50° - 86°F (6° -30°C).
Blue
Red

Data sheet
Danfoss can accept no responsibility for possible errors in printed materials and reserves the right to alter its products without notice.
All trademarks in this material are property of the respective companies. Danfoss and Danfoss logotype are trademarks of Danfoss A/S. All rights reserved.
Danfoss
Baltimore, MD
Toll Free: 866-375-HVAC (4822)
Tel.: [phone], Fax: [phone]
www.na.heating.danfoss.com
Danfoss
Toronto, ON
Toll Free: 866-676-8062
Tel.: [phone], Fax: [phone]
www.na.heating.danfoss.com
2VDSGA122 © Danfoss 03/10
FH-WS
Electronic Room Thermostat
Wiring Diagram:
Dimensions
inches (mm):
Line
Neutral
Signal
Timer
Optional
Floor
Sensor
24V, Line
24V, Neutral
Floor
Sensor
Signal
Timer
Not Used
Optional
Floor
Sensor
Neutral
Line
24 Volt
Power
Source
Optional External
Timer
(not included)
Actuator
1.1
(28)
3.2
(80)
2.4
(60)
3.0
(77.5)
100
90
80
70
60
50
40
30
20
10
30 35 40 45 50 55 60 65
Temperature (˚F)vs Resistance (kOhms)
Floor Sensor for FH-WS
Temperature (˚F)
Resistance (kOhms)
70 75 80 85 90 95 100 105
Floor Sensor
Characteristics: