Ouellet OTH770 User Manual
OTH770
User Guide
Non-programmable Thermostat
n
Description
The OTH770 thermostat has been designed for floor heating
systems. It has built-in ground fault protection and an input for
connecting a floor sensor, supplied with the thermostat.
Depending on the mode of application you choose, each thermostat
can be used to control the floor temperature (F mode) or to control
the ambient temperature while keeping the floor temperature within
comfortable and safe limits (AF mode).
Your thermostat has Vacation Mode which can be activated by
connecting an Aube telephone controller (CT240 or CT241) or any
other remote control device equipped with a normally open (NO) dry
contact.
On/Off switch
Appears when
the setpoint
temperature is
displayed
Heating intensity
Floor temperature
1
On
Floor LimitOff
2
limit button
Temperature display
Vacation mode indicator
(see section 4)
Ground fault indicator
3
4
1.
o
Installation
2.
CAUTION
• Installation must be carried out by a qualified electrician and
must comply with national and local electrical codes.
• Use this thermostat only for resistive load.
• Do NOT install the thermostat in an area where it can be
exposed to water or rain.
• To prevent severe shock or electrocution, always turn the
power OFF at the service panel before working with wiring.
• Install the thermostat onto an electrical box.
• This thermostat has tinned copper wires for line and load connections. Use special CO/ALR solderless connectors if you
connect the thermostat to aluminum wires.
n Turn off power to the heating system at the service panel in
order to avoid any risk of electrical shock.
o To remove the thermostat faceplate, loosen the screw at the bot-
tom of the thermostat and lift the bottom of the faceplate outwards towards you. (The screw remains captive on the base.)
Faceplate
Temperature adjustment
buttons
1
Switch the thermostat Off when it is not in use (e.g., during summer). To reset the ground fault protection, switch the thermostat to
Off and back to On.
2
The image disappears when heating is off.
3
The temperature limits are used only if your thermostat is configured in AF mode.
4
When the ground fault protection is activated, GFI appears on the
screen and the TEST button-light at the top of the thermostat illuminates (see section 7).
Base
p Connect the thermostat wires to the power supply and to the
load using solderless connectors for copper wires.
Power supply
240 V (120 V)
L2(N)
L1(L)
Red
L2(N)
L1(L)
Black
Red
Red
(White)
Red
(White)
Black
Black
Black
Load
OTH770 400-609-011-A 2009-07-29 1/3
q Insert the temperature sensor wires through one of the openings
on the thermostat base and connect the wires to terminals 1 and
2 (no polarity).
• The sensor cable must not come in contact with the electrical
wires and must be routed outside the electrical box and follow
the wall down to the floor.
• Position the sensor cable such that it does not come in contact with the floor heating wires. The sensor must be centered
between two floor heating wires for best temperature control.
• Do NOT staple the sensor head (the plastic end) to the floor.
Doing so might damage the sensor. Any damage might not be
noticeable during testing but can become apparent several
days later.
r If you wish to connect a remote control device, insert the wires
(use 18- to 22-gauge flexible wires) through one of the two openings on the base and connect them to terminals 2 and 3 (no
polarity).
3.1 Temperature Display (S1)
Select between °C and °F.
3.2 Application Mode Selection (S2)
F: Select the F mode if you wish to control the floor temperature.
AF: Select the AF mode if you wish to control the ambient temperature.
q
The Vacation mode can be activated using a remote control device
equipped with a normally-open (NO) dry contact such as Aube’s
telephone controller (CT240/CT241).
In the Vacation mode, the temperature is reduced by 3.5°C (7°F) and
the thermostat buttons are locked to prevent any temperature
adjustment. The mode is indicated by the suitcase icon on the
screen. When the contact opens, the thermostat returns to normal
mode and to the initial temperature setpoint.
r
When the thermostat is powered, it first undergoes a
series of tests before displaying the actual temperature.
s
Vacation Mode
Power-up
Error Messages
The measured temperature is below the thermostat’s display range. Heating is activated.
4.
5.
6.
Floor sensor
To remote control device (see section 4)
s Push the excess length of the line voltage wires back inside the
electrical box. Install the thermostat base onto the electrical box
using the provided screws.
t Set the DIP switches (refer to section 3).
u Reinstall the thermostat faceplate on its base and secure it with
the screw. If there is a sticker on the screen, peel it off.
v Apply power to the heating system. Verify the installation by
making sure that the heating system can be turned on or off by
increasing or decreasing the setpoint respectively.
w Test the ground fault protection (refer to section 7).
NOTE: Keep the air vents (openings) at the top and bottom of the
thermostat clean and unobstructed at all times.
p
The configuration switches are located on the back of the faceplate.
Configuration
The measured temperature is above the thermostat’s display range. Heating is deactivated.
Verify the thermostat and sensor connections.
7.
t
The thermostat has built-in ground fault protection. In the event of a
ground fault, the ground fault protection mechanism on the thermostat trips and quickly stops the flow of electricity to prevent serious
injury.
Ground Fault Protection
7.1 Definition of a ground fault
Instead of following its normal safe path, electricity passes through a
person’s body to reach the ground. For example, a defective floor
3.
heating mat can cause a ground fault.
A ground fault protection thermostat does not protect against circuit
overloads, short circuits, or electrical shocks. For example, you can
still receive an electrical shock if you touch bare wires while standing
on a non-conducting surface such as a wood floor.
7.2 Resetting the Ground Fault Protection
The TEST button-light is On (red) when the
ground fault protection mechanism trips. If
the TEST button-light comes On during normal operation, reset the ground fault protection and check if the fault has been
caused by an external interference such as
a halogen button-light or an electric motor.
To reset the ground fault protection, switch
the thermostat to Off and back to On. The
TEST button-light will go off. However, if the
TEST button-light
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