II. Installation Guide
1. Applications:
The electronic thermostat INSTAT+ 2R7 or INSTAT+ 3R7 can be used for temperature
controls together with:
• Actuators of floor heating systems or radiators
• Oil and gas warm water heating
• Circulating pumps
• Heat pumps
• Electric radiators
2. Installation:
Installation location:
The device should be installed in a location in the room which:
• is easily accessible for operation
• is free of curtains, cabinets, shelves, etc.
• allows for free air circulation
• is not subject to direct sunlight
• is not subject to draught
(e.g. when windows/doors are opened)
• is not subject to direct influence
from the heating sources
• is not on an outside wall
• is about 1.5 m above the floor
The controller must be installed directly onto the wall or on a flush-mounting socket.
1. Remove battery cover using a coin (Battery model only).
2. Remove the front cover using a flat screwdriver and separate from back plate.
3. Attach the back plate to a flush-mounting socket using suitable wall plugs and
screws.
4. Complete the wiring to the heating source according to the wiring diagram inside
the product or below.
for INSTAT+2R7 (Battery) for INSTAT+3R7 (Mains)
5. Replace the front cover by pushing it fully onto the back plate.
6. Install the 2 AA batteries provided (Battery model only).
7. Reattach the battery cover (Battery model only).
The controller is now installed and will automatically start to control the room tem-
perature according to the pre-set program 1 (refer to User Guide).
All important functions are set ex-factory. If you wish to change any of the settings,
please refer to the options in the User Guide.
According to the heating type, refer to item 3.9 (option 10).
Caution!
The device must only be opened by a competent electrician and installed accor-
ding to the wiring diagram in the housing cover or this guide. The existing safety
regulations must be complied with.
Appropriate installation measures must be taken to achieve protection class II.
This electronic device which can be installed independently may only be used to
control the temperature in dry and enclosed rooms in a normal environment. The
device is radio-interference suppressed according to VDE 0875 T.14 resp. EN 55014
and functions according to method of operation 1C (EN 60730).
Warning!
Switch off mains supply before removing an existing room thermostat or installing
this controller.
3. Installer options
Attention: The settings should only be carried out by the installer only, as settings may
affect the functions and security of the heating system. List of Installer options see
Table 2.
To activate the menu, press the < and + buttons simultaneously for 5 seconds
Select an option by pressing the < or > button
Change an option by pressing the +- button
Press < or > to accept each change.
To exit the menu, press the < and + buttons simultaneously for 5 seconds.
If no button is pressed within 2 minutes, the controller will return to the auto mode.
3.1 Access protection lock / child lock (option 1, table 2)
When this function is activated, all buttons will be locked.
To switch off the protection lock, enter the installer options and set option 1 to OFF.
3.2 Frost protection (option 2, table 2)
The frost protection of the controller can be activated via this option.
Frost protection will switch on the heating if the room temperature falls to 5°C and
will then control the temperature at 7°C.
When in Off mode frost protection will still be active.
3.3 Low and high limit set points (option 3, 4, table 2)
These limits can be-used to prevent temperatures from being set too high or too low.
The set point default values are 32°C (high limit) and 7°C (low limit).
3.4 Optimum start (option 5, table 2)
If this function is activated, the controller will automatically calculate the warm up time
for the heating system in order to achieve the desired temperature for each event.
This function is a major energy saving factor.
Note: This function is only possible in the AUTO mode.
After commissioning, it takes a couple of days for the controller to gather enough
information to correctly calculate this function.
3.5 Heating/cooling (option 6, table 2)
Use this function to select whether the controller is used exclusively for either heating
or cooling applications.
HEATING: The relay will switch on when the temperature falls below the set point.
COOLING: The relay will switch on when the temperature rises above the set point.
3.6 Valve protection (option 7, table 2)
If valve protection is selected, the controller's relay will be switched on once a day at
10 o’clock.
This function is designed to prevent the valves and pumps from getting stuck during
the summer months.
If this is required, select On in the installer options.
The operating period can be chosen via option 8.
3.7 Valve protection time (option 8, table 2)
The valve protection time can be set between 1 and 5 minutes (default: 3 minutes).
3.8 Emergency heating in case of sensor failures (option 9, table 2)
The following message is shown in case of sensor failures:
E1 for an internal sensor failure
A sensor failure can have the following effects:
1. If this function is activated, the heating is switched on for 30% of the time (this pre-
vents the room from being too cold or overheating)
2. When this function is not activated, the heating is switched off
3.9 Application type (option 10, table 2)
This function is used to select the application type of the controller.
0 = Radiator Control or Electric Heat (= Default)
1 = Water floor heating control
4. Technical data
For INSTAT+2R7
Order Type INSTAT+ 2R7
Supply voltage 2 x AA 1,5V alkaline batteries
Switching current 10mA …. 16(2)A; AC 24 ... 250 V~
Battery life 3 years (typically)
Weight (with batteries) ~ 200 g
For INSTAT+3R7
Order type INSTAT+3R7
Supply voltage 230 V AC 50 Hz (195...253 V)
Switching current 10mA …. 16(2)A; AC 230 V~
Weight ~ 180g
For INSTAT+2R7 and INSTAT+3R7
Temperature setting range 7°C to 32°C
Temperature resolution 0,1°C
Output Relay change over contact, voltage free
Output signal Pulse width modulation (PWM)
Timing resolution 1 minute
Accuracy of clock < 4 Min / year
Ambient temperature Operating 0°C bis 40°C
Storage –20°C bis 85°C
Ambient humidity Operating 25 % to 85 %
(without condensation)
Storage 15 % to 95 %
Rated impulse voltage 2,5 kV
Ball pressure test 75 °C
Voltage and Current for the for
purposes of interferncemeasurements 230 V, 0,1 A
Pollution degree 2 (see Caution)
Degree of protection IP 30
Software class A
Dimensions
5. Troubleshooting:
1. It is getting warm too late
a. Are clock and program events set correctly?
b. Is the Optimum Start switched on (see 3.4)?
c. Did the thermostat have enough time (some days) to determine the room data?
2. The thermostat does not accept any changes
Is the access protection lock switched on (see 3.1)?
3. E1 is shown in the display:
Sensor failure (see 3.8 )
6. Battery handling
Table 2 Installer Options
Installer-
Options Descriptions Select between Default
1 Access protection lock (child lock) ON OFF OFF
2 Frost protection ON OFF ON
3 Low limit set point °C 7 High limit 7
4 High limit set point °C Low limit 32 32
5 Optimum start ON OFF ON
6 Heating /Cooling Heat Cool Heat
7 Valve protection ON OFF ON
8 Valve protection time 1 … 5 3
9 Emergency heating (sensor failure) ON OFF OFF
10 Application type Radiator (0) Water Floor heating (1) 0
Batteries, rechargeable or not, should not to be disposed of into ordi-
nary household waste. Instead, they must be recycled properly to pro-
tect the environment and cut down the waste of precious resources.
Your local waste management authority can supply details concerning
the proper disposal of batteries.
In compliance with the EU Directive 2006/66/EC, the button cell battery located on
the printed circuit board inside this product, can be removed at the end of the
product life, by professional personnel only.
