OTH770
400-609-011-A 2009-07-29 1/3
OTH770
User Guide
Non-programmable Thermostat
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.
1
Switch the thermostat Off when it is not in use (e.g., during sum-
mer). 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 config-
ured 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 illumi-
nates (see section 7).
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 out-
wards towards you. (The screw remains captive on the base.)
p
Connect the thermostat wires to the power supply and to the
load using solderless connectors for copper wires.
n
Description
1.
Floor Limit
Off
On
Temperature adjustment
buttons
On/Off switch
1
Heating intensity
2
Temperature display
Appears when
the setpoint
temperature is
displayed
Vacation mode indicator
(see section 4)
Ground fault indicator
4
Floor temperature
limit button
3
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 con-
nections. Use special CO/ALR solderless connectors if you
connect the thermostat to aluminum wires.
Base
Faceplate
L2(N)
L1(L)
L2(N)
L1(L)
Load
Power supply
Red
Black
Red
(White)
Red
Black
Black
Black
240 V (120 V)
Red
(White)
400-609-011-A (OTH770-GA&GB) ENG.fm Page 1 Wednesday, July 29, 2009 2:42 PM
