GREYSTONE HAS AN ISO 9001 REGISTERED QUALITY SYSTEM

RIGID DUCT AVERAGE HIGH LIMIT THERMOSTAT

THDR SERIES

CABLE GLAND FITTING

THREAD ADAPTER 1/2” NPT TO M16

ACCESSORIES - INCLUDED WITH F STYLE ENCLOSURE

PRODUCT DESCRIPTION

The multi point rigid 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 6 mm

(0.236”) OD, 304 series stainless steel 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 type probes are installed through a

hole in the side of the duct to monitor a single

point temperature within the duct. Since the

probes are tip sensitive, select a probe length

that places the sensor well into the duct. Install

the probe 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.

SENSOR TYPE

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

304 series stainless steel

PROBE DIAMETER

6mm (0.236”)

STANDARD LENGTHS

450mm, 600mm, 900mm (18”, 24”, 36”)

WIRE MATERIAL

PVC/Kynar, 28 AWG

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)

SETPOINT TEMPERATURE

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"

Various Probe Lengths

See Specifications

116.5 mm

4.58"

0.5" NPT

Foam Gasket

304 Series S/S Probe

53.7 mm

2.11"

6.00 mm

0.236"