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Description
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.
Heating intensity
Appears when the thermostat
is configured for a fan-forced
heater.
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)
Installation
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.
OTH550 & OTH557
Make the connections using solderless connectors for copper wires.
1.
The thermostat wires are non-polarized; this means either wire can
be connected to either terminal.
Temperature
display
Keypad lock
WARNING: This thermostat has tinned copper wires for line and load
connections. Special CO/ALR solderless connectors must be used
Temperature
adjustment
when connecting with aluminium conductors.
buttons
Install the wallplate to the electrical box.
Set the configuration switches on the
2.
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
NOTE: Keep the air vents of thermostat clean and unobstructed at all
times.
OTH550 & OTH557
Installation and User Guide
Electrical
Electrical
panel
box
Thermostat
Electrical
panel
Heater
and
buttons.
400-612-003-D
Electronic Thermostats
Heater
Electrical
box
Thermostat
Adapter plate
Required only for
OTH557 (347 V).
2009-06-23
1/2
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Related Manuals for Ouellet OTH557
Summary of Contents for Ouellet OTH557
- Page 1 Description The thermostat wires are non-polarized; this means either wire can be connected to either terminal. The OTH550 & OTH557 thermostats are designed to control an elec- Electrical Electrical tric heating system such as a baseboard heater, a radiant ceiling, a...
- Page 2 OUELLET CANADA INC. warrants the component parts of the OTH550 return to its normal display if you do not press any button for one minute. and OTH557 against defects in material and workmanship for a three (3) year period from the date of purchase, under normal use and service, Temperature Display and Setting when proof of purchase of such is provided to the manufacturer.
Need help?
Do you have a question about the OTH557 and is the answer not in the manual?
Questions and answers
My Thermostat screen is blank. How do I fix it ?
To fix a blank screen on the Ouellet OTH557 thermostat, try the following steps:
1. Check Power Supply – Ensure the thermostat is receiving power by verifying that the heating system is powered on at the main electrical panel.
2. Verify Installation – Confirm that the thermostat is properly installed, including secure wiring connections.
3. Power Cycle – Turn off power to the thermostat at the main electrical panel, wait a few minutes, and turn it back on.
4. Backlight Test – Press any button to see if the screen backlight turns on for 10 seconds. If not, the thermostat may not be receiving power.
5. Inspect for Damage – Look for any physical damage or protective film on the screen that may be affecting visibility.
If the issue persists, consult a qualified electrician for further troubleshooting.
This answer is automatically generated