NELSON™ HEAT TRACING SYSTEMS
SPECIFICATION / APPLICATION
TH4X325 THERMOSTAT INSTALLATION
DESCRIPTION
These thermostats are used for controlling heat
tracing systems in an ordinary locations. The capillary
bulb should be mounted on the side of the pipe.
ENCLOSURE
Die Cast Aluminum
CLASSIFICATIONS
NEMA Type 4X IP66
TEMPERATURE RANGE
Range
-4 to 163°C (25 to 325°F)
CAPILLARY
Length Material Max. Bulb Temp.
3m (10ft.) Stainless Steel 215°C (420°F)
ELECTRICAL DATA
CSA Rating UL Rating
22 amp resistance 480VAC 22 amp resistance 480VAC
CALIBRATION ACCURACY
1.6°C (3°F)
SWITCH TYPE
Single Pole Double Throw
OUTLINE
197mm (7.75")
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:
General Locations
UL - E89748 CSA - LR701949 CE
114mm (4.5")
102mm (4")
SWITCH NUMBER
MEDIA TEMPERATURE LIMITS
ADJUSTABLE RANGE
D.C. AMPS6V 12V 24V 125V 250V
125V 250V 480V 600V
A.C. AMPS
TEMPERATURE INDICATING AND
REGULATING EQUIPMENT.
LISTED 266T
R
TYPE 4
F
100
50
F
C
C
500
TEMP
SW
102mm (4")
114mm (4.5")
142mm (5.6")
38mm (1.5")
26mm (3")
10mm (.38")
29mm (.16")
20mm (.81")
P.O. BOX 726 TULSA, OK 74101 TEL 918-627-5530 FAX 918-641-7336 www.nelsonheaters.com
GA-1986 Rev. 6
December 2005
NELSON™ HEAT TRACING SYSTEMS
t
y
SPECIFICATION / APPLICATION
TH4X325 THERMOSTAT INSTALLATION
INSTALLATION
Thermosta
Conduit to
Thermostat
Junction Box
Stand-off
Capillary
WIRING DIAGRAM
Power Suppl
MI Cold Sectio n
Pipe Clamps
Method for installing LT, HLT,
CLT and NC heater cable types.
!
WARNING:
Do not mount sensing
bulb near heater cable.
Pipe
Fiberglass Tape
Sensing Bulb
DIRECT CONTROL LOW TEMPERATURE
Phase
Heater
C
NO
NC
Phase
Alarm (Low
temperature)
ALARM
C
NO
NC
Alarm (high
temperature)
HIGH TEMPERATURE
ALARM
Phase
C
NO
NC
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-1986 Rev. 6
December 2005
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