GREYSTONE HAS AN ISO 9001 REGISTERED QUALITY SYSTEM

OUTSIDE HIGH LIMIT THERMOSTAT

THOS SERIES

PRODUCT DESCRIPTION

The outside high limit thermostat incorporates

a precision thermistor temperature sensor and

provides a Form C relay output (NO/NC) with an

adjustable setpoint. All probes are constructed

to provide excellent heat transfer, fast response

and are potted to resist moisture penetration. A

hinged and gasketed weatherproof Polycarbonate

enclosure is included for ease of installation.

TYPICAL INSTALLATION

For complete installation and wiring details,

please refer to the product installation

instructions.

The outside high limit thermostat should be

mounted on an outside North facing wall, under

the eaves which will provide protection from direct

sunlight.

The outside high limit thermostat can be mounted

directly to the building’s wall face using the

provided mounting holes. There is one 0.85” hole

for conduit connection.

CABLE GLAND FITTING

THREAD ADAPTER 1/2” NPT TO M16

ACCESSORIES - INCLUDED WITH F STYLE ENCLOSURE

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

-10 to 50°C (14 to 122°F)

PROBE MATERIAL

Machined aluminum

WIRE MATERIAL

PVC insulated, parallel bonded

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°C)

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

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

COUNTRY OF ORIGIN

Canada

SPECIFICATIONS

North

OSA Temperature

Sensor

99.7 mm

3.96"

116.8 mm

4.6"

112.5 mm

4.43"

53.98 mm

2.125"