13.5
START UP PROCEDURE
1)
With the switch closed, open the electrical panel and exclude compressor (refer to the wiring diagram on the
unit). Close the panel, set switch to “ON” (to give power to the unit).
2)
Wait for the start of the microprocessor and control. Make sure that the temperature of the oil is hot enough.
The oil temperature must be at least 5°C higher than the saturation temperature of the refrigerant inside the
compressor.
3)
Place the unit in the “ON” and wait until the unit is indicated on the display-On.
4)
Turn on the pumps (at max speed if with inverter).
5)
Verify that the loss of load of the evaporator is equal to that of the project and correct if necessary. The
pressure drop on the evaporator must be read on the service valves installed on the evaporator piping as a
standard. Do not measure the load losses in points where any valves and / or filters are interposed.
6)
Check for air in cleaning filters, and then drain the system.
7)
Return the pump to the factory setting.
8)
Turn off the power (into standby mode) and make sure the pumps stop after about 2 minutes.
Verify that the local temperature subcooling is set to the required value by pressing the Set button.
9)
Turn the main switch to “OFF”. Open the cabinet. Reactivate the compressors. Close the cabinet. Turn the main
switch to “ON” (to give power to the unit).
10)
Wait for the start of the microprocessor and control.
11)
When the compressor is started, wait about 1 minute for the system begins to stabilize.
12)
Check the pressure of evaporation and condensation of refrigerant.
13)
Verify that, after a period of time necessary for the stabilization of the refrigerant circuit, the liquid indicator
placed on the inlet pipe to the expansion valve is completely filled (no bubbles), and that the moisture indicator
signs ‘Dry’. The passage of bubbles within the liquid indicator may indicate a low amount of refrigerant, or an
excessive pressure drop through the filter drier, or an expansion valve blocked at the maximum opening position
14)
In addition to checking the sight glass, check the operating parameters of the circuit controlling:
a) - Overheating compressor
b) - Overheating compressor discharge
c) – Sub cooling of the liquid exiting the condenser coil
d) - Evaporation pressure
c) - Condensing pressure
15)
Measure the values of pressure and temperature by means of the suitable instrumentation and make comparison
by reading the corresponding values directly on the display of the microprocessor on board
16)
To temporarily turn off the unit put on standby the unit key or open the remote contact (terminals shown in the
wiring diagram provided with the unit) of the terminal X (by means of a remote switch installed by the customer)
or set time zones. The microprocessor will activate the shutdown procedure that will take a few seconds. The unit
water pump will be running on for two minutes after the unit has been switched off. Do not remove the main
power to not turn off the electrical resistances of the compressor and the evaporator.
14
MAINTENANCE
Maintenance operations are fundamental in order to keep the units running properly, from a purely functional and an
energetic and environmental points of view
.
Every unit comes with a logbook, in which the user to machine maintenance can keep all the required notes, in order to
keep a historical log of the unit.
A lack of notes in the logbook could be considered proof of careless maintenance.
14.1
GENERAL
IMPORTANT!
Beyond the cadences of checks recommended in the following, in order to keep the unit at optimum levels of
performance and efficiency and prevent incipient failures, we recommend periodic visits of inspection and control of
the unit by qualified personnel.
In particular, we recommend:
4 annual visits to units that operate about 365 days / year (quarterly)
2 visits per year for units with seasonal operation about 180 days / year (one at the start of the season and another one
at mid-season)
1 annual visit for units with seasonal operation of about 90 days / year (starting seasonal)
It’s important that during the initial start-up and periodically during operation routine checks are carried out. Among
them we must also check the suction and condensation as well as the sight glass located on the liquid line.
Check through the microprocessor installed on the unit if the unit is working within normal parameters of superheating
