OTH550 400-612-003-F 2009-12-11 1/2
OTH550
Installation and User Guide
Electronic Thermostat
The OTH550 thermostat is designed to control an electric heating
system such as a baseboard heater, a radiant ceiling, a radiant floor,
a convector or a fan-forced convector.
This thermostat cannot be used with:
• a resistive load under 1.25 A or 2 A (see section 10)
• a resistive load over 16.7 A
• a system driven by a contactor or a relay (inductive load)
• a central heating system
SUPPLIED PARTS
• One (1) thermostat
• Two (2) 6-32 mounting screws
• Two (2) solderless connectors
The installation must be carried out by an electrician and must
comply with local electrical codes.
CUT POWER TO THE HEATING SYSTEM AT THE MAIN
ELECTRICAL PANEL TO AVOID ANY RISK OF ELECTRI-
CAL SHOCK.
Loosen the screw and
remove the faceplate
of the thermostat from
its wallplate.
NOTE: The screw
remains captive on the
wallplate.
Make the connections using solderless connectors for copper wires.
The thermostat wires are non-polarized; this means either wire can
be connected to either terminal.
WARNING: This thermostat has tinned copper wires for line and load
connections. Special CO/ALR solderless connectors must be used
when connecting with aluminium conductors.
Set the configuration switches on the
back of the thermostat’s faceplate (see
section 3).
Install the faceplate of the thermostat
back on the wallplate and tighten the
screw.
NOTE: If there is a protective film or
sticker on the thermostat’s screen, peel it
off.
Apply power to the thermostat. Verify the installation by checking that
the heater can be turned On and Off by raising and lowering the set-
point using the
and buttons.
NOTE: Keep the air vents of thermostat clean and unobstructed at all
times.
n
Description
1.
o
Installation
2.
Temperature
display
Temperature
adjustment
buttons
Keypad lock
Heating intensity
Appears when the thermostat
is configured for a fan-forced
heater.
Electrical
panel
Heater
Electrical
box
Thermostat
Electrical
panel
Heater
Electrical
box
Thermostat
Install the wallplate to the electrical box.
400-612-003-F (OTH550) ENG.fm Page 1 Friday, December 11, 2009 9:17 AM
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