GREYSTONE HAS AN ISO 9001 REGISTERED QUALITY SYSTEM

FLEXIBLE CABLE DUCT AVERAGE HIGH LIMIT THERMOSTAT

THDF SERIES

CABLE GLAND FITTING

THREAD ADAPTER 1/2” NPT TO M16

ACCESSORIES - INCLUDED WITH F ENCLOSURE OPTION

PRODUCT DESCRIPTION

The flexible, multi-point duct averaging high

limit thermostat incorporates several precision

thermistor temperature sensors and provides a

Form C relay output (NO/NC) with an adjustable

setpoint. The probe is FT-6 plenum rated cable and

is available in various lengths (see ordering chart).

All probes are constructed to provide excellent

heat transfer and a fast response. A Polycarbonate

enclosure with a hinged and gasketed cover is

included for ease of installation.

TYPICAL INSTALLATION

For complete installation and wiring details,

please refer to the product installation

instructions.

The flex-duct average probes are installed

through a hole in the side of the duct to monitor

an average temperature within the duct. Select

a probe length that allows for criss-crossing

the duct multiple times. Install the probes in a

straight section of duct at a suitable distance

downstream from any heating, cooling, or

humidification devices. The cable probe needs

to be fastened onto hangers using tube

clamps or wire ties and should be secured

every 100 cm or 3’ maximum to prevent

movement of the wire and prevent wear.

If sensor is to be used in high velocity or

vibration environment use of rigid style duct

probe is recommended.

The enclosure provides mounting tabs for ease

of installation.

POWER SUPPLY

12 to 28 Vac/dc

SENSOR ACCURACY

±0.2°C, 0 to 70°C (±0.36°F, 32 to 158°F)

PROBE SENSING RANGE

-20 to 60°C (-4 to 140°F)

WIRE MATERIAL

FT-6 plenum rated cable, 22 AWG

STANDARD LENGTHS

1800mm, 3600mm, 6100mm, 7300mm (6’, 12’, 20’, 24’)

CONSUMPTION

50 mA max

RELAY CONTACTS

SPDT, Form C contacts (N.O. and N.C.)

5 Amps @ 30 Vdc/250 Vac resistive

1.5 Amps @ 30 Vdc/250 vac inductive

RELAY ACTION

Activates on temperature rise

SETPOINT OPERATION

Single-turn knob-pot on PCB

ADJUSTABLE SETPOINT

38 to 60°C (100 to 140°F)

TEMPERATURE DIFFERENTIAL

Low: 1.1°C (2°F) Mid: 2.8°C (5°F) High: 5.6°C (10°F)

Jumper selectable

TEMPERATURE SENSOR

10,000Ω curve matched precision thermistor

OPERATING CONDITIONS

-10 to 50°C (14 to 122°F), 5 to 95 %RH, non-condensing

STORAGE CONDITIONS

-30 to 70°C (-22 to 158°F), 5 to 95 %RH, non-condensing

WIRING CONNECTIONS

Screw terminal block (14 to 22 AWG)

ENCLOSURE

B: Grey polycarbonate UL94-V0, IP65 (NEMA 4X)

F: Same as B with thread adapter (1/2” NPT to M16) and cable gland fitting

COUNTRY OF ORIGIN

Canada

SPECIFICATIONS

112.5 mm

4.43"

99.7 mm

3.93"

Foam Gasket

Various Probe Lengths

See Specifications

304 Series S/S Probe

FT-6 Plenum Rated Cable

116.5 mm

4.58”

0.5" NPT

53.7 mm

2.11"