Vertiv Liebert PDX, Руководство пользователя

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20 Liebert
®
PDX, EconoPhase Version - UM - 265133 - 29.08.2019
7 - Start-up
7.1 - First start-up
(or after long standstill)
TO PREVENT COMPRESSOR DAMAGE THE CRANKCASE(S)
MUST BE PREHEATED FOR AT LEAST 4 HOURS BEFORE
CONDITIONER START-UP (FAILURE TO DO SO INVALIDATES
THE GUARANTEE).
Start the air conditioner as follows:
1. Open all valves in the refrigeration circuit according to the
instruction label attached to the valve.
2. Ensure that the refrigerant charge is correct (see Chap. 4).
3. Using a leak detector, verify that there are no refrigerant
leaks. If there are any, then repair the leak and recharge as
described in Chap. 4.
4. At least 4 hours before start-up, close the main switch and
miniature circuit breaker for transformers’ protection on the
electrical panel. In the control system factory setting the
stand alone mode is standard. The stand alone mode gives
the possibility of turning on the unit simply rotating the main
switch on the electric panel. The yellow LED on the Control
case will light after turning the unit on, showing the presence
of the electric power.
If the LED does not light up:
• check the electric panel power supply;
• check the protection devices (e.g.: thermal switches);
• check the fuses.
5. Verify the operation of the crankcase heater.
6. (With Electronic Expansion Valve option) The battery is
normally charged enough by the supplier to pass properly
the production test. In case the unit has been left for long
period without power the level of charge could be reduced
further. If after Power ON the iCOM control should generate
the “EEV1/2 Battery failure” warning, please wait approx 24h
before to decide to change the battery; this will give necessary
time for recharge; if after this time the warning event is still
present, then replace the battery with a new one.
7. Check that there are no water leakages.
8. If an external condenser is installed, start it by supplying
power to it.
9. Close all MCBs on the electrical panel.
10. Check the supply voltage on all phases.
11. Check the supply voltage on all phases for the external
condenser, if fitted.
12. ENSURE THAT THE COMPRESSOR HAS BEEN
PREHEATED FOR AT LEAST 4 HOURS BEFORE STARTING
THE UNIT.
13. Start the unit by pressing ON/OFF on the external display (on
the internal display if the external display is not installed)
14. Check the electrical absorption of all components (see Chap.
6).
15. Check the electrical absorption of the external condenser/ Dry
cooler, if fitted.
16. IMPORTANT - If the compressor makes a loud and
unusual noise IT IS NECESSARY TO INVERT the electrical
connections of the phases supplying the corresponding
scroll compressor, which accepts only one direction of
rotation.
17. Ensure that the fans rotate in the correct direction (see arrow
on fan).
CAUTION
: risk of contact with rotating devices.
18. Ensure that all control system settings are correct and that
there are no alarms (see Control manual).
19. Verify the Fresh Air Intake operation (if fitted).
20. Once the system is operating under load, check the various
components, as follows:
• Verify that the fans are operating properly.
• Ensure that the temperature and relative humidity are being
controlled, and that the humidifier (optional) and heating steps
(optional) operate when required.
• Ensure that the compressor operates when required.
• Ensure that the fan operation controller on the external
condenser is calibrated correctly, and that it controls the fan
operation.
• Check oil level inside compressors, where compressor’s oil
level sight glass is available, after 30 min of compressors
running at maximum capacity: oil level must be between ½ and
¾ of sight glass. In tandem compressors the oil level must be
checked with both compressors running at maximum capacity
(note: when only one compressor is running, the oil level inside
the compressor that is not currently running could be at the
minimum and the compressor, that is running, at the maximum
level; when one compressor is running at maximum capacity
and one compressor is running in modulating capacity, the oil
level in the latter one could be between 1/2 and the minimum).
7.2 - Starting and stopping
• ALWAYS ENSURE THAT EACH CRANKCASE HAS BEEN
PREHEATED. FOR BRIEF STOPPAGES KEEP THE SUPPLY
TO THE CRANKCASE HEATER.
Turn on the unit operating on the ON/OFF switch placed on the
display. If the ON/OFF remote device is not installed, the green
LED on the Control case will light up together with the LED placed
below the ON/OFF switch. The fan starts immediately (the fan
always works when the unit is ON); after 2 minutes the regulation is
activated, so the cooling (compressor), heating (electric heaters),
humidifying and dehumidifying devices can start.
Adjust the set-point as indicated in Control manual.
Stop the unit putting the ON/OFF switch in OFF.
• The main switch on the electrical panel inside the unit should
be switched off if the unit is stopped for a long time.
7.3 - Automatic restart
If desired, the unit will automatically restart on the return of
power after a supply interruption (see Control manual). If the
power interruption is expected to be of several hours, to avoid an
automatic cold restart of the compressor stop the unit before the
black-out and, on the return of power, allow the compressor to
preheat before restarting the unit.
7.4 - Checking the refrigeration piping pressure
drops
Liebert
®
PDX is equipped with connections to check the
refrigeration piping pressure drops:
room unit → condenser →room unit
To carry out this operation it is necessary to use 2 calibrated
manometers and connect them as follows:
M1, connected to the compressor delivery valve;
M2, connected to the Schrader valve (1) of Fig. 14.
When the compressor is running, check M1 and M2.
N.B.
: Repeat this test, inverting the manometers: to calculate the
correct p consider the average value of the two readings.
Refrigeration pipeline Pressure drops ( Δ p bar), at 45°C
• At the same geodetic level: Δ p (bar) = M1-M2
• When condenser is above the room unit:
Δ p (bar) = M1-M2+geodetic difference (m x 1,1:10,2)
• When condenser is below the room unit:
Δ p (bar) = M1-M2-geodetic difference (m x 1,1:10,2)