OPERATING AND MAINTENANCE MANUAL
Start up
MCCY - CY 013÷301
31
ENGLISH
EN
The data in this manual are not binding and they can be modified by the manufacturer without notice.
Reproduction of this manual is strictly prohibited.
C
HAPTER
6
S
TART
UP
ATTENTION
Before starting up these units be sure that all personnel have read and understood the Chapter 2 “Safety“.
ATTENTION
When the system is started up, if the high pressure alarm A01 is triggered without the compressor having been started,
stop the unit immediately by setting it in OFF status from the controller.
Then check the refrigerant circuit high pressure value; if this value is within the normal operating range, check that the
sequence of phases upstream of the unit is correct.
Alarm A01 may also be triggered by tripping of the fuse of the transformer inside the electrical panel.
1. Check that the machine's on/off valves are open.
2. Check that the tank is completely full of water and properly vented.
The modes equipped with the hydraulic group (optional), it is possible to check on the pressure gauge if the
pressure is about 0.5 bar.
Check that the ambient temperature is within the limits indicated on the machine data plate.
3. Check that the main switch is in the OFF position (“O”).
4. Check that the power supply voltage is correct.
5. Power the machine (stand-by unit) by means of the supply line protection device.
6. Press the button
'
for 5 seconds to
start up the unit.
The led of the
icon blinks for 5 sec. and than it lights on.
For further information see 7.10 “Unit switching on / off” .
7. In three-phase units MCCY-CY 031÷301, check that compresses works correctly (it must not be noisy or
overheated) and check that the pump (if installed) and the fan rotation direction is correct (it have to suck the air
from inside the machine).
The machines have been designed in order that these three components would have the some rotation direction.
So, if one works in the right way even the other do.
Check the rotation direction of each component at the first start-up of the unit and after any maintenance
intervention.
If the rotation direction is wrong for all components, invert two supply phases of the electronic board. If on the
contrary they are not correctly connected, invert the borns phases of the corresponding counter (see wiring
diagram).
8. In the models equipped with the pump (optional), it is possible to check the pressure difference between the value
read by the pressure gauge positioned on the unit back panel with the pump running and the value read with the
pump stopped. The difference must be greater than the available pressure head with maximum pump flow rate.
If this difference is lower, it means that the water flow rate is greater than the permitted maximum value.
To avoid damaging the pump it is necessary to increase the pressure drop in the hydraulic circuit: e.g.
partially closing a pump outlet cock (the cock at pump outlet is by the installer).
9.
If with the first start-up
, there is a high ambient temperature and the temperature of the water in the hydraulic
circuit is much higher than the working value
(e.g. 25-30°C)
this means that the machine starts up overloaded with
the consequence of
possible tripping of the protection devices
.
To reduce this overload, a machine outlet valve can be gradually
(but not totally!)
closed to reduce the flow
of water passing through it.
Open the valve as the water temperature in the hydraulic circuit reaches the working value.
10. The machine is now ready for operation.
If the thermal load is lower than that produced by the machine, the water temperature drops until it reaches the set-
point value (
ST01
parameter) set following the indications of Chapter 7 “Electronic Board“.
When
ST01
value has been reached, the thermostat controlling the water inlet temperature stops the compressor.
If installed, the water pump continues to run however.
Summary of Contents for MCCY-CY013 301
Page 68: ......
