i-SHWAK V4
Inverter air/water chillers and heat pumps with wall-mounted indoor unit and remote condensing outdoor unit
29
12
MAINTENANCE AND PERIODIC CHECKS
WARNING: All the operations described in this chapter HAVE TO BE CARRIED OUT BY TRAINED STAFF ONLY. Before
any operation or before acceding to the inner components of the unit, be sure that the power supply is not connected.
The compressor’s heads and discharge piping are usually at high temperature l
evels. Be very careful when operating
in their surroundings. Aluminium coil fins are very sharp and can cause serious wounds. Be very careful when
operating near them. After servicing operations, re-install the cover panels, and fix them by means of screws.
The refrigerant circuits must not be filled with refrigerant gas other than that indicated on the nameplate. The use of
a different refrigerant can cause severe damage to the compressor.
It is forbidden to use refrigerant oils other than those specified in this manual. The use of different oil can cause
serious damage to the compressor.
The top part and discharge pipes of the compressor operate at high temperatures. Be sure to let the unit to become
cool before beginning any maintenance work.
Be careful when working near the condensing coils.
The aluminum fins are very sharp and can cause serious injuries.
After the maintenance operations, close the panels fixing them with screws.
Be sure that only trained and qualified personnel to perform maintenance operation and periodical inspections on the equipment.
The EU Regulation 517/2014 establishes that users should assign a qualified personnel to be responsible to regularly carry out
inspections of the facilities, to perform tightness test and eliminating eventual leakages within the shortest possible time. Also has
to check the obligatoriness and the necessary documentation about the Regulation (EU) No 517/2014 and its subsequent
amendment or repeal.
It is a good rule to carry out periodic checks in order to check the proper operation of the unit.
OPERATION
1 month
4 month 6 month
Loading of the water circuit.
x
Presence of bubbles in the water circuit.
x
Check the proper working of the safety and control devices (indoor and outdoor units)
x
Check if there is a possible oil leakage from compressor (outdoor unit).
x
Check if there is a possible water leakage from the hydraulic circuit (indoor unit).
x
Check the proper working of the flow switches (outdoor unit).
x
Check out if the crankcase resistances are supplied and working properly (outdoor unit).
x
Clean the metallic filters of the hydraulic circuit.
x
Clean the finned coil by means of compressed air (outdoor unit).
x
Check if all the terminals on the electric board as well as on the terminals of the compressor are properly fixed.
Clean from time to time the remote control switch’s sliding and fixed contactors (indoor and outdoor units).
x
Tightening of hydraulic connections.
x
Check the tightening and the balancing of the fan blades (outdoor unit).
x
Correct voltage.
x
Correct power absorption.
x
Check the refrigerant charge.
x
Check the operating pressure, and superheat and sub-cooling
x
Check of the efficiency of circulation pump.
x
Check the expansion tank.
x
If the unit should be out of service for a long period, discharge water from the piping and from heat exchanger.
This operation is necessary if, during seasonal stoppages, ambient temperature is expected to go down below
the freezing point of the employed fluid.
x
12.1
ENVIRONMENTAL PROTECTION
According to the norms dealing with the use of depleting stratospheric ozone substances, it is forbidden to release refrigerants
fluids in the atmosphere. They have to be collected and delivered to the seller or to proper gathering points at the end of their
operating life. Refrigerant R410A is mentioned among controlled substances and for this reason it has to be subjected to the
mentioned norms.
A particular care is recommended during service operations in order to reduce as much as possible any
refrigerant loss.
13
DISPOSAL
Once the unit is
arrived
at
the
end of its life cycle and needs to be removed or replaced, the following
operations
are
recommended.
x
the refrigerant has to be recuperated by trained people and sent to a proper collecting centre;
x
compressors’ lubricating oil has to be collected and sent to
a proper collecting centre;
x
the frame and the various components, if not serviceable any longer, have to be dismantled and divided according to their
nature, particularly copper and aluminium, which are present in conspicuous quantity in the unit. These operations allow easy
material recover and recycling process, thus reducing the environmental impact.