explosionproof space heating thermostats

3.) Center punch and/or drill the mounting screw locations.
INDEECO Explosionproof Space Heating Thermostats are
cCSAus certified Class I, Division 1, Groups. B, C & D and
Class II, Division 1, Groups E, F & G; Class I, Zone 1 & 2, Group
IIB+H2 as indicated on the data plate. The thermostats are
intended to be used in conjunction with electric space
heaters for temperature control.
4.) For mounting with Figure 1, carefully remove the 2 machine
screws holding the enclosure to the base plate.
For details on the particular hazardous environments
having the potential for explosion, refer to Articles 500
through 516 of the National Electrical Code, and/or Section
18 of the Canadian Electrical Code, Part I.
6.) For mounting with Figure 2, Insert 4 mounting screws
through the mounting bracket and fasten to the wall or any
field supplied bracket.
A. The Explosion-proof Space Heating Thermostats are
intended to be permanently mounted to a wall with the
base plate or bracket provided as part of the assembly or
with a field supplied mounting bracket. When the assembly
is factory mounted on the heater cabinet the enclosures are
connected to the heater terminal box using rigid metal
conduit and the controls are factory wired. All wiring
connections to a remotely located thermostat must be
made using rigid metal conduit, and an explosion-proof
conduit seal must be located within 18 inches of the
enclosure entrance. All wiring must comply with all national
and local codes for equipment in hazardous locations.
5.) For mounting holes per Figure 1, Insert 2 mounting screws
through the enclosure mounting holes, through the base
plate holes and screw into the mounting surface.
B. Electrical Installation. Follow these instructions to
complete the electrical installation.:
Potentially lethal voltages are present. Be sure to lock the
branch circuit disconnect switch in the off position and tag the
circuit “Out for Maintenance” before working on this
1.) Follow the heater wiring diagram and any Code
recommendations in making all electrical connections.
B. When installing:
1. Observe all nameplate ratings, warnings and notes.
2. Follow the wiring diagram supplied with the heater for
making all electrical connections.
3. Keep all electrical connections tight.
4. Carefully read and comply with all warnings and
2.) Use only an approved explosion-proof means of wiring,
such as insulated copper conductors in rigid metal conduit
with threaded connections per the NEC or the CEC to make
the electrical connections to the thermostat.
4.) The branch circuit voltage and phase must match the
heater voltage and phase rating.
A. Mechanical Installation. Once an acceptable location has
been determined, follow these instructions to complete the
mechanical installation.
5.) The thermostat cannot be used to carry the load directly
for heaters requiring a three phase voltage source.
1.) See Figure 1 or as an option see Figure 2 for mounting
hole location dimensions.
6.) The thermostat cannot be connected to a voltage greater
than the nameplate rating.
3.) Determine the voltage, phase and KW rating of the heater
to be controlled from the heater data plate.
2.) Mark the mounting screw locations.
Pg 1 of 2
7.) The thermostat cannot be used to carry the load
directly for heaters requiring a single phase current
greater than the nameplate rating.
8.) Calculate the rated load current for single phase
heaters as follows:
Rated load current
Kilowatt rating X 1000
Branch Circuit Voltage
9.) Use branch circuit supply wires rated for 75°C and the
rated load current to connect the heater.
14.)Remove the thermostat adjustment knob by pulling it up
and off the shaft.
15.)Remove the fish paper barrier.
16.)Pull the thermostat and heater connection wires out of the
terminal box through the cover opening.
17.)Using approved wire nut or crimp type connections make
the electrical connections, ensuring they are tight and
10.)For thermostats connected to an optional built on or
remote contactor, for three phase or high voltage and
or high amperage applications, electrically connect the
thermostat to break the contactor holding coil voltage,
which cannot be greater than the nameplate voltage
rating and should not exceed 125VA.
18.)Carefully push the wires back into the terminal box.
11.)Install an appropriately rated conduit sealing fitting in
one of the 3/4" NPT connection hubs to the thermostat.
21.)Pour the explosionproof seal in the sealing fitting.
12.)Install an appropriately rated pipe thread plug in any
un-used hubs.
13.)Remove the terminal box cover.
Figure 1
19.)Install the fish paper barrier and thermostat knob.
20.)Install the terminal box cover, making sure it is screwed
tightly in place.
Keep these instructions with the heater for future
Figure 2
425 Hanley Industrial Court • St. Louis • MO • 63144 • USA
(314) 644-4300 • FAX (314) 644-5332
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