1.5
Water connections
General
To drain the domestic hot water circuit. See chapter Maintenance.
Limit temperature at the draw-off point: the maximum domestic hot water temperature at the draw-off
point is subject to special regulations in the various countries in which the appliance is sold in order to
protect the user. These special regulations be observed when installing the appliance.
Precautions
Insulate the pipes to reduce heat losses to a minimum.
Fit drainage valves between the indoor unit and the heating circuit.
If radiators are connected directly to the heating circuit, make sure that there is enough volume of heating
water available in the installation. For example, install a pressure actuated bypass valve and a buffer
tank between the indoor unit and the heating circuit.
Respect the minimum and maximum water pressure and temperature (70°C) to ensure the appliance op
erates correctly. See chapter on Technical Specifications.
The hydraulic installation must be capable of handling a minimum flow rate at all times.
Heating water and domestic water must not come into contact with each other. Domestic water must not
circulate through the exchanger.
1.6
Recommendations
Operation
Keep the indoor unit and outdoor unit accessible at all times.
Regularly check the hydraulic pressure in the heating system.
Do not touch radiators for long periods. Depending on the heat pump settings, the temperature of the
radiators may exceed 60 °C.
Do not power off the heat pump. The frost protection mode does not work if the heat pump is switched
off.
If you do not need to heat your home for a long period, turn off the heating function or activate frost pro
tection mode. See the chapter Selecting the operating mode.
Do not drain the installation, except in cases of absolute necessity, for example at disposal. See the
chapter Decommissioning and disposal.
Give preference to the OFF or frost protection mode rather than switching off the system to leave the
following functions running:
Anti blocking of pumps
Frost protection
Never remove or cover the labels and data plates affixed to appliances. Labels and data plates must be
legible throughout the entire lifetime of the appliance.
Immediately replace damaged or illegible instructions and warning stickers.
If you need to switch off the heat pump in the event of a prolonged absence, drain the indoor unit and the
heating system to prevent the system from freezing.
Do not make any modifications to the heat pump without the written consent of the manufacturer.
To benefit from warranty cover, no modifications should be made to the appliance.
1.7
Specific instructions for service, maintenance and breakdowns
Precautions
Maintenance work must be carried out by a qualified professional.
Only a qualified professional is authorised to set, correct or replace the safety devices.
For heat pumps with a refrigerant load of more than 5 tonnes of CO
2
equivalent, the user must have an
annual leak-tightness test performed on the refrigerant equipment.
Before any work, switch off the power supply to the heat pump, the indoor unit and the hydraulic/electri
cal backup.
Wait for approx. 20-30 seconds for the outdoor unit capacitors to be discharged, and check that the lights
on the outdoor unit PCBs have gone out.
Before working on the refrigeration circuit, switch off the appliance and wait a few minutes. Certain items
of equipment such as the compressor and the pipes can reach temperatures in excess of 100 °C and
high pressures, which may cause serious injuries.
Use only original spare parts.
Locate and correct the cause of power cut before resetting the safety thermostat.
Removal and disposal of the heat pump must be carried out by a qualified professional in accordance
with prevailing local and national regulations.
After maintenance or repair work, check the entire heating system to ensure that there are no leaks.
Remove the casing only to perform maintenance and repair work. Put the casing back in place after
maintenance and repair work.
1 Safety instructions and recommendations
6
MIT-S
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