T/FS Frost Protection Thermostat
Data Sheet
T/FS
Frost Protection Thermostat
Description
Capillary thermostat suitable for the prevention of freezing of
liquid filled heat exchangers or pipes, and similar applications.
Switching action is responsive to the lowest temperature along
the sensing element. IP54 (NEMA 3) housing with tamper-proof
cover.
Physical
120 mm (4.72”)
Manual Reset Button
(T/FS-M option)
Temperature Setpoint
indicator
6 m (6.5 yds)
Capillary (supplied
coiled)
130 mm (5.12”)
Features
• 6 metre (6.5 yds) capillary
• Manual or automatic reset option
• Adjustment range -10 °C to +12°C (14 °F to 54 °F)
• IP54 (NEMA 3) housing
• Integral mounting bracket
60 mm (2.36”)
ø 6 mm
(0.24”)
70 mm (2.76”)
Cable gland
130 mm (5.12”)
T/FS Frost Protection Thermostat Data Sheet 91-2777 Issue 2 03/04/08
ACC/FC
5 mm (0.2”)
50.5 mm (1.99”)
50.4 mm (1.98”)
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T/FS Data Sheet
INSTALLATION
(1) Mount frost stat in a reasonably clean location, free from
damp and condensation, using mounting bracket supplied
(120 mm, 4.72” fixing centres).
(2) Install the complete length of the element so that it spans
the face area of the heat exchanger, as shown in the
diagram, so that it is exposed to all areas where low
temperatures are likely to be encountered.
Thermostat Element Duct
Temperature of thermostat body
must be greater than
temperature setting point
Typical Mounting Arrangement
The element is usually installed on the downstream side
of the heat exchanger and must be fixed in a vertical
plane.
The capillary has to be positioned with a large bend
radius, never less than 25 mm (~1”). It is recomended to
use the fixing clips (ACC/FC).
The T/FS has a 250 Vac, 15 A switching capacity. It should be
incorporated directly into the Air Handling Unit Control circuits to
protect heating and cooling exchanges and ductwork fabric
Alternatively, the T/FS can be used to provide an input to the IQ
system controller to initiate a frost protection control strategy.
If the capillary is damaged with a leak of gas the frost stat
simulates a low temperature and sets the switch accordingly.
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T/FS Frost Protection Thermostat Data Sheet 91-2777 Issue 2 03/04/08
Data Sheet T/FS
CONNECTIONS
Note that the room temperature at the thermostat body should not fall below the setting point.
(1) Remove anti-tamper screw on top of face, and undo
screw on front of unit and remove front cover.
(2) Insert cable through cable gland and connect signal
wires to terminals as shown. The unit can be wired
normally open or normally closed.
(3) Adjust setting levels to required temperature set-point
using screw on top of unit. 5 °C to 7 °C (41 °F to 44.6 °F)
is recommended.
(4) Replace cover and fit tamper-proof top cover.
Note: Ensure cover is screwed shut and cable gland is properly
tightened to guarentee IP54 protection.
DISPOSAL
WEEE Directive :
digital input
channel
IQ1 or IQ2
red
blue
T/FS
C
NO
NC
T/FS switch shown in
‘warm’ state
(Examples of IQ connection to normally open contact)
red
blue
white
digital input
channel
red
blue
COM
IN
IQ3
0(0V)
N(In)
+(24V)
N
At the end of their useful life the packaging and
product should be disposed of by a suitable
Do not dispose of with normal household waste.
Do not burn.
recycling centre.
ORDER CODES
T/FS-M: Frost protection thermostat with manual reset
T/FS-A: Frost protection thermostat with automatic reset
ACC/FC: Set of 6 fixing clips
T/FS Frost Protection Thermostat Data Sheet 91-2777 Issue 2 03/04/08
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T/FS Data Sheet
SPECIFICATIONS
Product description :T/FS frost protection thermostat
Measuring range :-10 to +12 °C (14 °F to 54 °F)
Sensing element :6 metre (6.5 yds) gas filled copper
Ambient limits :-20 to +80 °C (-4 °F to +176 °F), 0 to 95%
Control action :Single pole, single throw circuit opens
Electrical rating :15 A, 250 Vac
Connections :Screw terminals for 0.5 to 4 mm2 (12 to
Environmental
Protection :IP54 (NEMA 3)
Accuracy :±2°C
Dimensions
Sensing element :3.2 mm (0.13”) dia. x 6 m (6.5 yds) long
Minimum bending radius
of sensing element :20 mm (0.79”)
Housing :130 mm x 130 mm x70 mm (5.12” x 5.12”
Fixing centres :120 mm (4.72”)
Cable entry :22 mm (0.87”) diameter cut-out fitted
capillary
RH non-condensing
on fall of temperature
26 AWG) cable
x 2.76”) (with mounting bracket)
with rubber grommet
Material
Sensing element :Copper/Tin plated
Housing :Base polyamide, cover polycarbonate
Fixing clips :Polyamide (V-0)
(V-0)
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© 2008 Honeywell Technologies Sàrl, ECC Division. All rights reserved. Manufactured for and on behalf of the Environmental and Combustion Controls
Division of Honeywell Technologies Sàrl, Ecublens, Route du Bois 3, Switzerland by its Authorized Representative, Trend Control Systems Limited.
Trend Control Systems Limited reserves the right to revise this publication from time to time and make changes to the content hereof without
obligation to notify any person of such revisions or changes.
Trend Control Systems Limited
P.O. Box 34, Horsham, West Sussex, RH12 2YF, UK. Tel:+44 (0)1403 211888 Fax:+44 (0)1403 241608 www.trend-controls.com
Trend Control Systems USA
6670 185th Avenue NE, Redmond, Washington 98052, USA. Tel: (425)897-3900, Fax: (425)869-8445 www.trend-controls.com
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T/FS Frost Protection Thermostat Data Sheet 91-2777 Issue 2 03/04/08
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