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
33
minimum radius of / ". Style 4, / " diameter bulbs may not be bent.
88
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
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
INSTALLATION AND OPERATING INSTRUCTIONS FOR TYPE XT
EXPLOSION RESISTANT AND MOISTURE RESISTANT THERMOSTATS
1.0 GENERAL
The XT thermostat series features Norseman’s unique x-Max® track and trolley wiring system (patent pending). The unit can
be eld 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 classication is suitable for the hazardous area classication.
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 77°F (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
When handling the sensing bulb, do not kink or squeeze the bulb or capillary. Style 9, 3/16” diameter bulbs may be bent to a
16 minimum radius of 3/8”. Style 4, 3/8” diameter bulbs may not be bent.
CAUTION: ALWAYS DISCONNECT POWER BEFORE INSTALLATION OR SERVICING.
2.0 WIRING
2.1 All units must be wired by qualied personnel to electrical code requirements. Conduit, conduit seals and ttings shall
be approved for intended use.
2.2 Disconnect the power to the unit. Remove knurled cover.
2.3 Make 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.
Figure 1: Wiring diagram for XT****1 S.P.S.T. Thermostats Figure 2: Wiring diagram for XT****3 D.P.S.T. Thermostats
MI133 rev.0.01
3.0 CONVERTING FROM TAMPER-PROOF TO KNOB-ADJUST MODE
PRESS
THERMOSTAT
TO SPRING
THERMOSTAT
IN ‘SPRUNG’
POSITION
Figure 3: ‘Springing’ the thermostat
3.1 Disconnect the power to the device. Remove the knurled cover from the housing assembly. Remove the socket-head
cap screw.
3.2 Ensuring that the thermostat shaft remains aligned with the cap screw hole, place the knob onto the operating shaft and
thread it into the cap screw hole.
3.3 When the operating shaft engages with the thermostat shaft, with light
PRESS
THERMOSTAT
TO SPRING
nger pressure, gently spring the thermostat away from the bracket assembly,
as shown in Figure 3 (DO NOT press down on the steel bracket). Rotate
the knob one more full revolution to assure a positive engagement of the
thermostat. Release the thermostat.
3.4 Upon release, the thermostat should spring back into its original position.
If the thermostat remains sprung down, a slight twisting of the knob in both
directions should create a positive engagement. The knob should be able
to turn through the entire temperature range but should not turn one full
Figure 3: ‘Springing’ the thermostat
THERMOSTAT
IN ‘SPRUNG’
POSITION
revolution. If the knob turns completely around, repeat 3.3.
4.0 CONVERTING FROM KNOB-ADJUST TO TAMPER-PROOF MODE:
4.1 Disconnect the power to the device. Remove the knurled cover from the housing assembly. Using nger pressure, gently
spring the thermostat away from the bracket assembly, as shown in Figure 3 (DO NOT press down on the steel bracket).
While the thermostat is sprung down, rotate the thermostat knob counterclockwise to remove the operating shaft.
4.2 Ensuring that the thermostat shaft remains aligned with the operating shaft hole, place the socket-head cap screw into
the hole at the front of the housing and tighten. Replace the knurled cover.
5.0 OPERATION
5.1 TAMPER-PROOF MODE: To set the thermostat temperature:
5.1.1 Disconnect the power to the unit.
5.1.2 Completely remove the socket-head cap screw from the housing
assembly.
5.1.3 Insert a at-head screwdriver into the slot cut in the thermostat shaft.
SLOT IN THERMOSTAT SHAFT
Figure 4: Thermostat temperature setting
READ TEMPERATURE
HERE
5.1.4 Rotate the screwdriver to set the thermostat to the desired temperature. See Figure 4 to determine the temperature
setting. Turning the shaft clockwise increases the set point temperature, counterclockwise rotation decreases the set point
temperature (as a quick check, note that the thermostat will switch at the ambient temperature when the shaft is rotated).
5.1.5 Read the temperature from the front face of unit, as shown in Figure 4.
5.2 KNOB-ADJUST MODE: To set the thermostat temperature:
5.2.1 Rotate the knob to set the thermostat to the desired temperature. Turning the shaft clockwise increases the set point
temperature, counterclockwise rotation decreases the set point temperature.
6.0 INSTALLATION
6.1 The type XT universal mounting bracket is designed for horizontal (knurled cover at the side) or vertical (knurled cover at
the top) mounting. Use the bracket supplied as a template to locate wall holes before attaching the bracket to the thermostat
and afxing the assembly to the wall.
6.2 The model XTW*****L has an external 3/8” NPT tting for installing into a tank wall. Use an open end wrench to tighten
the tting to a mating tank tting. Check for leaks and retighten if necessary.
6.3 All other model XTW thermostats are equipped with aluminum ns for increased temperature sensitivity.
MI133 rev.0.01
5918 Roper Road, Edmonton, Alberta, Canada T6B 3E1
Phone: (780) 466-3178 Fax: (780) 468-5904
PLEASE ADHERE TO INSTRUCTIONS PUBLISHED IN THIS MANUAL.
Failure to do so may be dangerous and may void certain provisions of your warranty.
For further assistance, please call:
24 Hr. Hotline: 1-800-661-8529
(U.S.A. and Canada)
Please have model and serial numbers available before calling.
WARRANTY: Under normal use the Company
warrants to the purchaser that defects in material or
workmanship will be repaired or replaced
without charge for a period of 18 months from
date of shipment, or 12 months from the start date of
product was purchased for authorized repair or
replacement within the terms of this warranty.
Subject to State or Provincial law to the contrary, the
Company will not be responsible for any expense for
installation, removal from service, transportation, or
damages of any type whatsoever, including damages
arising from lack of use, business interruptions, or
incidental or consequential damages.
The Company cannot anticipate or control the
conditions of product usage and therefore
accepts no responsibility for the safe application and
suitability of its products when used alone or in
combination with other products. Tests for the safe
application and suitability of the products are the sole
responsibility of the user.
This warranty will be void if, in the judgment of the
Company, the damage, failure or defect is the result of:
• vibration, radiation, erosion, corrosion, process
contamination, abnormal process conditions,
temperature and pressures, unusual surges or
pulsation, fouling, ordinary wear and tear, lack of
maintenance, incorrectly applied utilities such as
voltage, air, gas, water, and others or any
combination of the aforementioned causes not
• any act or omission by the Purchaser, its agents,
servants or independent contractors which for
greater certainty, but not so as to limit the generality
of the foregoing, includes physical, chemical or
mechanical abuse, accident, improper
installation of the product, improper storage and
handling of the product, improper application or the
misalignment of parts.
manufacturing defects apparent within 30 days from
the date of installation.
The Company neither assumes nor
authorizes any person to assume for it any other
obligation or liability in connection with the product(s).
The Purchaser agrees that all warranty work required
after the initial commissioning of the product will be
provided only if the Company has been paid by the
Purchaser in full accordance with the terms and
conditions of the contract.
The Purchaser agrees that the Company makes
no warranty or guarantee, express, implied or
statutory, (INCLUDING ANY WARRANTY OF
MERCHANTABILITY OR WARRANTY OF FITNESS
FOR A PARTICULAR PURPOSE) written or oral, of
the Article or incidental labour, except as is expressed
or contained in the agreement herein.
LIABILITY: Technical data contained in the catalog or
on the website is subject to change without notice. The
Company reserves the right to make dimensional and
other design changes as required. The Purchaser
acknowledges the Company shall not be obligated
to modify those articles manufactured before the
formulation of the changes in design or improvements
of the products by the Company.
The Company shall not be liable to compensate or
indemnify the Purchaser, end user or any other party
against any actions, claims, liabilities, injury, loss, loss
of use, loss of business, damages, indirect or conse-
es (including legal expenses), costs, obligations and
causes of action of any kind arising wholly or partly
from negligence or omission of the user or the misuse, incorrect application, unsafe application, incorrect storage and handling, incorrect installation, lack
of maintenance, improper maintenance or improper
operation of products furnished by the Company.
Edmonton
1-800-661-8529
(780) 466-3178
Oakville
1-800-410-3131
(905) 829-4422
F 905-829-4430
Orillia
1-877-325-3473
(705) 325-3473
F 705-325-2106
Greensburg
1-800-473-2402
(812) 663-4141
F 812-663-4202
Houston
1-855-219-2101
(281) 506-2310
F 281-506-2316
Denver
1-855-244-3128
(303) 979-7339
F 303-979-7350
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