NELSON™ HEAT TRACING SYSTEMS
SPECIFICATION / APPLICATION
TH7325-2 THERMOSTAT INSTALLATION
DESCRIPTION
These thermostats are used for controlling heat
tracing systems in hazardous locations. The capillary
bulb should be mounted on the side of the pipe.
OUTLINE
ENCLOSURE
Cast Aluminum
CLASSIFICATIONS
NEMA Type 4, 7, 9 IP66
TEMPERATURE RANGE
Range
-4 to 163°C (25 to 325°F)
CAPILLARY
Length Material Max. Bulb Temperature
3m (10ft.) Stainless Steel 215°C (420°F)
ELECTRICAL DATA
CSA Rating UL Rating
22 amp resistance 208/240VAC 22 amp resistance 208/240VAC
RELAY COIL
208-240VAC, 4VA
CALIBRATION ACCURACY
1.6°C (3°F)
SWITCH TYPE
Double Pole Single Throw
Annual Maintenance:
1. Remove cover.
2. Spray a coat of lubricant and rust preventative such as CRC Stor & Lube,
electrical grade, on the thermostat body.
3. Replace cover.
Approvals:
Hazardous Locations
UL - Class I & II, Groups B, C, D, E, F, G - E53121
FM - Class I & II, Groups B, C, D, E, F, G - 1ZIA0.AE
- Class I, Zone 1, AEx d IIB+H
CSA - Class I & II, Groups B, C, D, E, F, G - LR701950
CIII, Encl. Type 4
- Class I, Zone 1, Ex d IIB+ H
LCIE - II 2 G EEx d IIC T6 - 2 ATEX 6026
2
2
P.O. BOX 726 TULSA, OK 74101 TEL 918-627-5530 FAX 918-641-7336 www.nelsonheaters.com
GA-2455 Rev. 0
November 2007
NELSON™ HEAT TRACING SYSTEMS
t
SPECIFICATION / APPLICATION
TH7325-2 THERMOSTAT INSTALLATION
INSTALLATION
Thermosta
Thermostat
Conduit to
Junction Box
Stand-off
Capillary
WIRING DIAGRAM
Low Point Drain
Power Supply
MI Cold Section
Pipe Clamps
Method for installing LT, HLT
and NC heater cable types.
!
WARNING:
Do not mount sensing
bulb near heater cable.
Pipe
Fiberglass Tape
Sensing Bulb
208-240VAC Supply
Ø Phase
Ø Phase
Heater
Nelson Heat Tracing Systems products are supplied with a limited warranty. Complete Terms and Conditions may be found on Nelson's
website at
www.nelsonheaters.com.
P.O. BOX 726 TULSA, OK 74101 TEL 918-627-5530 FAX 918-641-7336 www.nelsonheaters.com
GA-2455 Rev. 0
November 2007
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