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12 MAINTENANCE AND PERIODICAL CONTROLS
WARNING: All the operations described in this chapter HAVE TO BE CARRIED OUT BY TRAINED STAFF ONLY.
Before any operation or before entering the inner components of the unit, be sure that the power supply is
disconnected. The compressor's head and discharge piping are usually at high temperature levels. Be very careful
when operating in their surroundings. Aluminium coil fins are very sharp and can cause serious wounds. Be very
careful when operating in their surroundings. After maintenance operations, re-install the cover panels, and fix
them by means of screws where necessary.
WARNING: The unit should be installed so that adequate clearance is available for maintenance and repairation.
The warranty does not cover costs related to platforms or handling equipment necessary for any maintenance.
The refrigerant circuits must not be filled with different gas other than that indicated on the nameplate. The use
of a different refrigerant can cause severe damage to the compressor.
It's forbidden to use oils other than those specified in this manual. The use of a different oil can cause serious
damage to the compressor.
It is recommended to set a lower temperature to decrease the heat release, prevent scale and save energy if the
outlet water is sufficient.
It is a good rule to carry out periodic checks in order to verify the proper operation of the unit:
OPERATION
Check the water supply and air vent frequently, to avoid lack of water or air in the water loop.
Check out that safety and control devices work correctly.
Check out possible oil leakage from compressor.
Check out possible water leakages from the hydraulic circuit.
Check out the proper working of the external flow switch (if it is installed).
Clean the metallic filters of the hydraulic circuit to keep a good water quality. Lack of water and dirty
water can damage the unit.
Clean the finned coil of the heat exchanger by means of compressed air (it's recommended to keep the
unit in a place where it is dry and clean, and which has good ventilation).
Check the correct operation of the electric heater for the purpose of anti-Legionella cycle(*). Be sure to
make a diagnosis with samples of water token from the critical points the whole hydraulic circuit.
Check out that all the terminals on the electric board as well as on the terminals of the compressor are
properly fixed.
Make sure the electrical components are good. If there is a damaged part or a strange smell, please
replace it in time.
Tightening of water connections.
Keep the unit clean by means of soft damp cloth.
It is recommended to clean the tank and e-heater regularly to keep an efficient performance.
Clean any external air filter regularly to keep an efficient performance.
Correct voltage.
Correct absorption.
Check each part of the unit and the pressure of the system. Replace the defect part if there is any, and
recharge the refrigerant if it is required.
Check the operating pressure, and superheat and subcooling
Check of the efficiency of circulation pump.
If the heat pump is not used for a long time, please drain out all the water from the unit and seal the unit
to keep it good. Please drain the water from the lowest point of the boiler to avoid freezing in winter.
Water recharge and full inspection on the heat pump is required before it is restarted.
Check and if necessary replace the magnesium stick.
(*) Checking the correct operation of the electric heater: The thermostat control scroll wheel situated on board of the electric
heater must be turned all counterclockwise. To test the activation of the electric heater, press the button and check with the tank
temperature increasing.
UNICA
Sanitary water heat pump
1 month
4 months
6 months
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every year
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