OTH550 & OTH557
400-612-003-D 2009-06-23 1/2
The OTH550 & OTH557 thermostats are designed to control an elec-
tric heating system such as a baseboard heater, a radiant ceiling, a
radiant floor, a convector or a fan-forced convector.
These thermostats cannot be used with:
•
a resistive load under 1.25 A (OTH550) or 2 A (OTH557)
•
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
•
One (1) adapter plate with two (2) mounting screws (OTH557 only)
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
Adapter plate
Required only for
OTH557 (347 V).
Install the wallplate to the electrical box.
OTH550 & OTH557
Installation and User Guide
Electronic Thermostats