CCI Thermal Technologies XTW - Explosion-Proof Thermostat (Air Sensing) - Manual

1.0 GENERAL
® The XT thermostat series features Norseman’s unique x-Max track and trolley wiring system (patent pending). The unit can be
field converted from externally adjustable to tamper-proof adjustable in minutes.
1.1 Type XT thermostats are suitable for both Moisture resistant and Explosion resistant applications. Check the thermostat
nameplate to ensure that the thermostat area classification is suitable for the hazardous area classification.
TEMPERATURE DIFFERENTIAL
Usually 5% of the range, but subject to variation depending on the application. Such factors as rate of temperature change,
location of sensing bulb, etc. will affect the differential.
OVERSHOOT
This control works on the principle of liquid expansion. A temperature rise expands the liquid in a bellows which operates a
switch. Overshoot in excess of 25°C above the highest set point can produce expansion forces that will possibly rupture the
bellows or at least cause a deformation that will affect calibration. Calibration shifts result in the process operating at higher
temperatures than indicated on the dial. Ultimate failure of this style of control will result in the load being energized
continuously. Therefore it is very important to include a high limit in the control circuit as dictated by the electrical code.
SENSING BULB
3 When handling the sensing bulb, do not kink or squeeze the bulb or capillary. Style 9, / " diameter bulbs may be bent to a
16
3 3 minimum radius of / ". Style 4, / " diameter bulbs may not be bent.
8 8
CAUTION: ALWAYS DISCONNECT POWER BEFORE INSTALLATION OR SERVICING.
2.0WIRING
2.1All units must be wired by qualified personnel to electrical code requirements. Conduit, conduit seals and fittings shall be
approved for intended use.
2.2Disconnect the power to the unit. Remove knurled cover.
2.3Make all necessary electrical connections. Models XT*****1 are equipped with a S.P.S.T thermostat suitable for use as a
switching component for single phase applications using less than 240 V / 30 A, 277 V / 25 A and 600 V / 15 A. Models XT*****3
are equipped with a D.P.S.T. thermostat suitable for use as a switching component for single or three phase applications using
less than 600 V / 15 A (See Figures 1 and 2 below). Thermostats are suitable for pilot duty only in applications requiring higher
voltages or currents.
INSTALLATION AND OPERATING INSTRUCTIONS FOR TYPE XT
EXPLOSION RESISTANT AND MOISTURE RESISTANT THERMOSTATS
Figure 1: Wiring diagram for XT****1 S.P.S.T. Thermostats Figure 2: Wiring diagram for XT****3 D.P.S.T. Thermostats
Edmonton
Toronto
Orillia
Montreal
USA 1-800-661-8529
1-800-410-3131
1-705-325-3473
1-514-334-3720
1-800-473-2402
MI133.rev.2004