19
The data inside this manual are not binding and they can be modified by the manufacturer without notice.
All rights reserved.
NPC 015 TO 230
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”
.
1.
Check that the machine's on/off valves are open.
2.
Check that the tank is completely full of water and properly vented .
3.
Carry out the level sensor calibration as indicated in the 8.5 “Level sensor” paragraph
4.
Check that the ambient temperature is within the limits indicated in the machine data plate.
5.
It is possible to check that the pressure is about 0.5 bar on the manometer located on the back of the unit (only if the water circuit is
of the closed type).
6.
Check that the main switch is in the OFF position (“0”).
7.
Check that the power supply voltage is correct.
8.
Power the machine by means of the supply line protection device.
9.
Turn the machine main switch ON (“I”).
10.
Check that the water flows across the evaporator.
11.
Press
'
button for 5 seconds
if you want to start the unit.
The led
flashes for 5 seconds and then it remains lit.
To
power-off
the machine, press the
'
key.
12.
In three-phase units, check that compressor works correctly (it must not be noisy or overheated) and check that the fans and the
pump (if installed) rotation direction is correct.
If necessary invert two phases of supply.
13.
Check that the pressure difference between the value read on the manometer located on the machine control panel with the pump in
motion and the value read with the pump stopped is higher than the available pressure with the pump's maximum flow capacity. If
this difference is lower, it means that the water flow capacity is higher than the maximum value allowed. In order not to damage the
pump, it is necessary to increase the pressure drop of the hydraulic circuit by, for example, partially closing a pump discharge cock.
14.
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 refrigerator starts up overloaded with the consequence of possible tripping
of the protection devices. To reduce this overload, a refrigerator 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.
15.
The machine is now
ready for operating
.
If the thermal load is lower than that produced by the unit, the water temperature drops until it reaches the set point (ST01
parameter) set following the instruction of chapter Electronic Board.
When SET-POINT value has been reached, the electronic control controlling the water inlet temperature stops the compressor. The
water pump, on the other hand, is always in motion.
Summary of Contents for Precision NPC 015
Page 1: ...n psi C1 SM 01 01 US NPC 015 230 60 Hz UL SERVICE MANUAL...
Page 2: ......
