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Chromalox
®
DIVISION
4
SECTION
GNIT
SALES
REFERENCE
DATE
SERVICE REFERENCE
Installation Instructions
PK479-3
161-506172-001
AUGUST, 2006
(Supersedes PK479-2)
© 2010 Chromalox, Inc.
Model PCN
Temperature
Volts
Max Capillary
Stock
Range (˚F) Amps. Length (Ft.)
GNIT-5 360946 30 to 220 120/240 25 5 S
GNIT-12 360954 30 to 220 120/240 25 12 S
Specifications —
Other temperature ranges available. Contact your local Chromalox Sales office.
Features:
• Rugged Design
• Moisture and Corrosion Resistant
• Teflon
®
Covered Capillary/Bulb
• Large Setpoint Dial
• Easy Installation
• Line Voltage
• DPST 25 Amp Switch
GENERAL
FIRE/EXPLOSION HAZARD. This thermostat is not
intended for use in hazardous atmospheres where
flammable vapors, gases, liquids or other com-
bustible atmospheres are present as defined in
the National Electrical Code. Failure to comply can
result in personal injury or property damage.
NOTICE: Type GNIT Thermostats are designed for temperature
control service only. Because they are not fail safe, they should
not be used for temperature limiting duty.
The system designer is responsible for the safety
of this equipment and should install adequate
back-up controls and safety devices with their
electric heating equipment. Where the conse-
quences of failure could result in personal injury or
property damage, back-up controls are essential.
The GNIT Non-Indicating Corrosive Resistant Thermostat is
designed for applications in atmospheres where corrosive material is
present. The double pole/single throw thermostat is available with
either a 5 foot or 12 foot copper capillary which is sleeved with
Teflon
®
. The Teflon
®
also covers the bulb. The thermostat is
designed for 25 amperes resistive loads for either 120 or 240 Vac.
Specifications:
Range 30 to 220˚F
Switch Action DPST (Double Pole/Single Throw)
Current 25 Amperes, 120 or 240 Vac
Accuracy ±9˚F
Load Lamp 120 Vac or 240 Vac
Capillary Length GNIT-5, 5 Foot
GNIT-12, 12 Foot
Diameter of Teflon
®
Cover 5/16” OD
Application Notes
1. Customer external fuse required.
Process Temperature Differential — is variation in controlled
process temperature between maximum, when thermostat turns
OFF and minimum, when thermostat turns ON. This spread in
temperature may be minimized by:
1. Making sure control is mounted to vertical surface. (See Step 1,
MOUNTING.)
2. Avoid excess heating capacity (oversized heaters).
3. Locating control sensing bulb in optimum position between
heat source and work.
MOUNTING
Note: Do not mount thermostat where it will be subject to vibra-
tion or shock. Do not mount adjacent to a large magnetic contac-
tor, as vibration and shock will cause thermostat to interact errati-
cally — resulting in chattering of the contactor.
The air temperature in and around the thermostat enclosure
should be kept as near to normal room temperature as possible…
never above 150˚F or below 30˚F.
1. Thermostat must be mounted in a vertical position only.
2. Use sheet metal or wood screws through the four 1/4” diame-
ter mounting holes in baseplate to mount control.
GNIT Moisture and Corrosion
Resistant Industrial Thermostat
Teflon
®
is a registered trademark of DuPont Co.