GREYSTONE HAS AN ISO 9001 REGISTERED QUALITY SYSTEM

FLEXIBLE COPPER DUCT AVERAGE HIGH LIMIT THERMOSTAT

THDC SERIES

CABLE GLAND FITTING

THREAD ADAPTER 1/2” NPT TO M16

ACCESSORIES - INCLUDED WITH F STYLE ENCLOSURE

PRODUCT DESCRIPTION

The multi point duct average high limit thermostat

incorporates several precision thermistor

temperature sensors and provides a Form C relay

output (NO/NC) with an adjustable setpoint. The

sensor is encapsulated in a 7.94 mm (0.3125”)

OD, soft copper probe and is available in various

lengths (see ordering chart). All probes provide

excellent heat transfer, fast response and resistance

to moisture penetration. A Polycarbonate enclosure

with a hinged and gasketed cover is provided for

ease of installation.

TYPICAL INSTALLATION

For complete installation and wiring details,

please refer to the product installation

instructions.

The 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 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)

PROBE MATERIAL

Soft copper

PROBE DIAMETER

7.94mm (0.3125”)

STANDARD LENGTHS

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

WIRE MATERIAL

FT-6 plenum rated cable

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

SENSOR ACCURACY

±0.2°C, 0 to 70°C (±0.36°F, 32 to158°F)

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"

Various Probe Lengths

See Specifications

116.5 mm

4.58"

0.5" NPT

Foam Gasket

Soft Copper

53.7 mm

2.11"

7.94 mm

0.312"