Danfoss FH-WS User manual

VDSGA122 © Danfoss 03/10

Data sheet FH-WS

Electronic Room Thermostat

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.

Danfoss

Baltimore, MD

Toll Free: 866-375-HVAC (4822)

Tel.: 443-512-0266, Fax: 443-512-0270

www.na.heating.danfoss.com

Danfoss

Toronto, ON

Toll Free: 866-676-8062

Tel.: 905-285-2050, Fax: 905-285-2055

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

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:

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