Ouellet OPX User Manual

180, 3e avenue – PO Box 188, L'Islet, Qc, G0R 2C0

Tél. :[phone] ou 1-800-463-7043,

FAX: [phone]

INSTALLATION, OPERATING AND

MAINTENANCE INSTRUCTIONS FOR

EXPLOSION-PROOF

HEATER "SERIES OPX"

I. GENERAL

The Explosion-proof Heater i s CSA and FM approved
for use in industrial areas that are classif ied as Class
I, Division 1, Groups. B, C & D, and Class II, Division
1, Groups E, F & G. The heaters are also available in
corrosion resistant construction, suit able for NEMA 3,
and corrosive environments. The specific heat er
ratings are shown on the data plate. The heat er s ar e
intended for horizontal wall or floor mounting in
industrial applications only. Surface temperat ur es
of the cabinet may exceed those normally expected
with residential equipment, so the heater should
never be installed in a residential or similar
environment where drapes or upholst er y may come
into contact with the heater or w here unintended
personnel contact may occur.

The maximum operating temperature ignition code is
stamped on the data plate. NEVER operate th e heat er
in an atmosphere with an ignition code temperatur e
lower than this rating. The heater s ar e designed f or
convection airflow in a maximum ambient
temperature of 40°C, 104°F. NE VE R operate the
heater in a vertical mounting orientat ion or w here the
ambient temperature may exceed 40°C, 104°F.

For details on the particular hazardous environments
having the potential for explosion, refer to Section 18
of the Canadian Electrical Code, Part I.

A. The Explosi on -proof Heater is inten ded to be
permanently mounted to a wall by mounting brackets
supplied with the heater or floor mounted with the
optional floor mounting brackets. A high temperature
limit control is built into the heater. All heaters
connected to a 3 phase voltage source and all single
phase heaters above 277 Volts or 25 amps will requir e
a control contactor, operated by the limit cont r ol, t o
control the heater. Certain optional cont r ols such as
a thermostat and/or contactor and contr ol voltage
transformer are available and wh en supplied w ith the
heater they are supplied inside their own r at ed
enclosures mounted on the right side of th e cabinet or
supplied as remotely mounted items. When mounted
on the cabinet the enclosures are connected to th e
heater terminal box using rigid metal conduit and the
controls are factory wired. Remot ely locat ed cont rols,
outside the hazardous area, may be in a standard
enclosure, area permitting. All wiri ng connect ions t o
the heater must be made using rigid metal conduit,
and an explosion-proof conduit seal must be located

immediately adjacent to the heater. All wiring must
comply with all national and local codes for equipment in
hazardous locations.

The heaters are specifically designed for each application
and should be properly installed, operated and
maintained for optimum service life.

B. Disassembly of the unit for installation is not required
or authorized. When installing:

1. Observe all heater nameplate ratings, war n ings
and notes.

2. Follow the wirin g di ag ram supplied with the h e at er
in making all electrical connections.

3. Keep all electrical connections tight.

4. Keep the heater terminal enclosure and heating
elements clean.

5. Never cover the heater w h ile in oper ation.

6. Carefully read and comply with all warnings and
cautions.

II. INSTALLATION

A. Site Selection.

1.) The Explosion-proof Heater is designed f or use
only while permanently mounted in a horizontal
orientation at a minimum of 6" (152mm) above the
floor.

2.) The site must allow suff icient free space around
the heater for safe and easy installation and
maintenance access. Workspace for heater
maintenance should be at least 3 feet (914mm) all
around the front of the heat er cabinet and
terminal box.

3.) Airflow thr ough t h e heat er should not be restricted
or blocked in any manner.

4.) The site must have adequat e means t o suppor t the
weight of the heater, and prov ide physical
protection to the heater.

Ouellet strongly recommends this heater be installed by qualified
personnel familiar with the Canadian Electrical Code requirements for
hazardous locations as well as any local codes. It is the responsibility
of the installer to verify the safety and suitability of the installation.

The heater must be mounted horizontally.

Disassembly of the unit, for installation, is not required or authorized.

Do not cover the heater or obstruct the free flow of air into or out of the
heater.

=WARNING=

=WARNING=

=WARNING=

=WARNING=

=WARNING=

Do not install the heater in a residential or similar environment where
drapes or upholstery may come into contact with the heater or where
unintended personnel contact may occur.

B. Mechanical Installation. Once an acceptable
location has been determined, follow these
instructions to complete the mechanical installation.

=WARNING=

Disassembly of the unit for installation is not required or authorized.

1.) Wall mounted heater.
a.) Refer to Figure 1.

b.) Mark the mounting screw locations or the

wall mounting brackets on the vertical
surface.

c.) Center punch and/or pilot drill the

mounting screw locations.

d.) Using four screws (not supplied w i t h t h e

heater) attach the wall mounting brackets
to the vertical surface.

e.) Lift the heater up and then dow n over the

mounting brackets so that the “V” lip at the
top of the brackets engage the slots in t h e
back of the heater cabinet.

f.) Make sure that the heater is resting in th e

bottom of the “V” lip so that the mounting
holes at the bottom of the wall mounting
bracket align with the mounting holes in
the heater cabinet.

g.) Fasten the heater to the wall mounting

brackets using the 2 screws, washers and
nuts provided.

C. Electrical Installation.

Follow these instructions

to complete the electrical installation:

=WARNING=
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 equipment.

1.) Follow th e w i ring diagram and any Code
recommendations in making all electrical
connections.

2.) Use only an approved explosion-proof m e an s of
wiring, such as insulated copper conductors in
rigid metal conduit with threaded connect ions
per Canadian Electrical Code to make the
electrical connections to the heater.

3.) Determine the v oltage, phase and KW rating of
the heater from the heater dat a plate.

4.) The branch circuit volt age and phase must
match the heater voltage and phase rating.

5.) Calculate the rat ed load cur rent of the heater
as follows:

Single Phase units
Three Phase Units

Kilowatts x 1000

Voltage

Kilowatts x 1000

Votalge x 1.73

Rated Load Current

Rated Load current

6.) Use branch circuit supply wires r a t e d f or 75°C
(167°F) and the rated load current to connect the
heater.

7.) For heaters without optional bui l t on thermostat
or contactor:

=WARNING=
When making electrical connections to the heater, be sure to follow the
wiring diagram provided with the heater. The heater must not be operated
without the safety high temperature limit cutout properly connected in the
circuit.

a.) All 3 phase heaters and all single phase

heaters above 277 volts or 25 amps must have
a safety contactor to disconnect the power if
the temperature high limit opens. The
contactor, must be CSA approved for 150,000
cycles with a resistive rating per pole equal t o
or greater than the heater rated load current.
The holding coil voltage rating of the contactor
cannot exceed 277 volts.

b.) Install an appropriately rate d expl osi on -proof

conduit sealing fitting in the 3/4" NPT
connection hub in the bottom of the heater

terminal box.
c.) Remove the terminal box cover.
d.) Pull t he heater power connection wires labeled

L1, L2 and if 3 phase L3 and th e h i g h

temperature control wires labeled C1 and C2

out of the terminal box through the cover

nipple.
e.) Run the branch circuit supply w ir es and the

contactor control wires, if any, through the

conduit and conduit sealing fitting into the

bottom of the terminal box and out through

the cover nipple.
f.) Select the appropriate wiring diagram that

matches the installation and make the wiring

connections using approved wiring connectors.
g.) Push the wires back into the heater t er minal

box.
h.) Install the terminal box cover, making sure it

is screwed tightly in place.
i.) Pour the explosion-proof seal in the sealing

fitting.
j.) Before application of electrical power, recheck

all connections to ensure compliance with the

wiring diagram and any code requirements.

Remove any foreign objects from the terminal

enclosure. Reinstall cover tightly.
k.) See oper at ing inst r uct ions, Sect ion V, before

operating the heater.

8.) For heaters with optional built on thermostat or
contactor follow the instructions provided with the
control(s).

=WARNING=
When making electrical connections to the heater, be sure to follow the
wiring diagram provided with the heater.

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