27
8
SHUTDOWNS FOR LONG PERIODS
The shutdown mode of the plant depends on the site of application and the time the plant is expected to be shut down. If the
unit is equipped with the antifreeze system, even when off (system on unit at “off” position), the antifreeze system keeps running
if power supply continuity to the equipment is guaranteed. If the system is expected to remain idle for a long period of time, it is
recommended to empty the liquid from the system unless there is an adequate amount of glycol.
To switch off the unit completely after having emptied the system:
•
Switch off the unit setting the switch of each appliance at “OFF”.
•
Close the water valves
•
Set the general residual current device at “OFF” (if installed upstream of the system).
If the temperature drops below zero there is serious danger of frost: provide a mixture of water and glycol in the
system, otherwise drain the water system and the circuits of the heat pump.
CAUTION: even the transient operation, with water temperatures below +5°C is not guaranteed on the basis of the
limits established in Paragraph 12.4. Before you turn the unit back on after a long idle period, make sure that the
temperature of the mixture of water and glycol is higher than or at least equal to +5°C.
9
MAINTENANCE AND PERIODIC CHECKS
CAUTION: All the operations described in this chapter MUST BE CARRIED OUT BY QUALIFIED PERSONNEL ONLY.
Before performing any intervention on the unit or accessing internal parts, make sure you have disconnected power.
The heads and delivery pipe of the compressor are normally quite hot. Be careful when working near the condensing
coils. The aluminium fins are very sharp and can cause serious injuries. After servicing operations, re-install the cover
panels, and fix them by means of screws.
CAUTION: Before starting to operate, safety checks must be performed to ensure the combustion hazard is reduced
to the minimum. The work must be undertaken according to a controlled procedure, to reduce to the minimum the
risk of flammable gases or vapours while performing the work. The area must be checked with an appropriate
refrigerant fluid detector before and during the work.
It is prohibited to fill the refrigerant circuits with a refrigerant other than that indicated on the identification plate.
Using a different refrigerant can cause serious damage to the compressor.
It is prohibited to use oils other than those indicated in this manual. Using a different oil can cause serious damage to
the compressor
The heads and delivery pipe of the compressor are normally quite hot.
Be careful when working near the condensing coils.
The aluminium fins are very sharp and can cause serious injuries.
After the maintenance operations, close the panels by fixing them with screws.
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 month
4 months
6 months
Mandatory
Filling the water circuit.
x
Presence of bubbles in the water circuit.
x
Check the proper working of the safety and control devices.
x
x
Check that there are no oil leaks from the compressor.
x
x
Check if there is a possible water leakage from the water circuit.
x
x
Check that the flow switch works properly.
x
x
Check that the crankcase heaters are powered and running.
x
x
Clean the metal filters of the water circuit.
x
x
Clean the finned coil with compressed air or water jet.
x
x
