Shutdowns For Long Periods; Maintenance And Periodic Checks - MAXA i-290 0106 Installer Manual

The identification plate applied on the machine has all of the technical and performance data of the appliance.
In case of tampering, removal or deterioration, ask to the Technical Assistance Service for a copy.
Tampering, removal and deterioration of the identification plate complicates installation, maintenance and request for spare
parts.
We recommend keeping track of the interventions carried out on the unit so as to make any troubleshooting easier.
In case of failure or malfunctioning:
• check the type of alarm triggered to report it to the assistance centre;
• contact an authorised assistance centre;
• if requested by the assistance centre, immediately deactivate the unit without resetting the alarm;
• require the use of original spare parts.

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 ("off" position of the on-board unit system).
The anti-freeze system remains in operation if the continuity of electrical supply to the appliances is guaranteed.
If the system is expected to remain idle for a long period, 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 taps.
• 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 Chapter 13.4. 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 (IEC 60335-2-40
Annex HH). The end user is forbidden to undertake any modification, repair or maintenance of the product.
Before performing any intervention on the unit or accessing internal parts, make sure you have disconnected power.
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 flam-
mable gases or vapours while performing the work. The area must be checked with an appropriate refrigerant fluid detector
before and during the work.
During any work carried out on the machine, the operator must always equip himself with a personal explosimeter for de-
tecting the refrigerant gas R290, calibrated to a maximum threshold of 20 %LFL (this device must be compliant for use in fire
risk zones and not be a source of ignition).
Maintenance must only be carried out in weather conditions suitable for the intended operations.
Before working on the unit, make sure that you have the appropriate working equipment available that complies with the
use with flammable gases.
For maintenance, the use of a lock-valve is strongly recommended (refrigerant circuit access valve) for hooking up with hos-
es (hose), in order to avoid gas leaks and risk of burns.
CAUTION: It is possible that a certain quantity of oil from the compressor is deposited in the pipes of the refrigeration circuit,
especially by bends. In case of maintenance operations in which it is necessary to unsolder the pipes, it is strongly recom-
mended to proceed with the cutting of the same and not with the disordering with a torch, as the flame triggers any oil
present.
42
i-290
Inverter air/water heat pumps with axial fans