Unical HP OWER 320RK, User'S And Installer'S Manual

Page: 69 / 88

28
After the maintenance operations, pay attention to the correct tightening of the cable gland designed for the passage of the
electric power cable..
It is recommended to have specialised personnel perform periodical inspections and maintenance. The EU regulation
n.517/2014 establishes that users must perform regular inspections on the plants, checking water tightness and eliminating
any leaks as quickly as possible. Verify the mandatory nature and the documentation required in regulation n.517/2014 and
its subsequent amendments or repeals.
The following are the recommended and mandatory activities for correct operation of the unit. The mandatory activities must be carried out
by an authorised customer service which issues a corresponding certificate. Failure to comply with these activities will entail forfeiture of the
warranty and could considerably shorten the service life of your product.
OPERATION
1
mese
4
mesi
6 mesi
12
mesi
Filling the water circuit x
Presence of bubbles in the water circuit. x
Check the proper working of the safety and control devices.. x
Check that there are no oil leaks from the compressor. x
Check if there is a possible water leakage from the water circuit x
Check that the flow switch works properly. x
Check that the crankcase heaters are powered and running. x
Clean the metal filters of the water circuit. x
Clean the finned coil with compressed air or water jet. x
Check that the electric terminals both inside the electric panel and in the terminal blocks of the compressor are
well tightened.
x
Tightening of plumbing connections. x
Check fixing and balancing of the fans. x
Clean the air filters in the electrical panel or replace them if necessary.(when present) x
Correct electrical voltage and phase imbalance (without load and under load). x
Correct absorption. x
Check the refrigerant charge and eventual refrigerant leaks. x
Check the operating pressure, superheating and sub-cooling. x
Circulation pump efficiency. x
If the unit is to be out of service for a long period, drain the water from the pipes and the heat exchanger. This
operation is indispensable if, during the shutdown period, ambient temperatures are expected to be below the
freezing point of the fluid used.
x
Check the presence of corrosion/ossidation x
Check panel fastening. x
Check the water quality (see chapter Characteristics of the system water) and the possible concentration of
glycol
x
Check the pressure drop of any filter driers on the liquid line. x
Check the hydronic side safety valve x
9.1 CLEANING THE FINNED COIL
To correctly clean the coil, follow the instructions below:
• Remove any superficial filth. Debris such as leaves, fibres etc. must be removed without a vacuum cleaner (use a brush or another soft tool
carefully avoiding scratching with metal or abrasive parts). If you use compressed air, pay attention to keep the air flow perpendicular to the
surface of the coil in order not to bend the aluminium fins. Pay attention not to bend the fins with the nozzle of the compressed air lance.
• Rinse. Rinse with water. It is possible to use chemical substances (specific detergents for finned coils). Rinse the coils by letting the water run
inside each individual passage of the fins, until they are perfectly clean. Pay attention to direct the water jet perpendicular to the surface
of the coil in order not to bend the aluminium fins. Do not strike the coil with the water hose. Apply your thumb at the end of the hose to
increase the pressure of the water jet instead of using specific nozzles which could damage the coil..
CAUTION:Do not clean the coil using high-pressure cleaners so as not to apply excessive pressure which could cause irrepa-
rable damage. Damage caused by cleaning with unsuitable chemical substances or excessively high water pressure will not
be recognised under warranty..
CAUTION:The aluminium fins are thin and sharp. Pay the utmost attention and use appropriate PPE to avoid cuts and abra-
sions. Cover your eyes and face appropriately to avoid squirting water and filth while blowing. Wear waterproof shoes or
boots and clothing covering your entire body.