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T-CU11-OCT22-0
Check List
BEFORE START-UP
No. Description
Check
1
Is the unit in good condition with holding gas and without any visible damage?
2
Has the unit been transported in upward position?
3
Is the crankcase oil level between 1/4 and 3/4 of the compressor sight glass (only
applicable to scroll compressor)?
4
Is the power supply on site in line with the unit specification?
5
Is air short circuit and/or air blockage avoided?
6
Is the installation location well ventilated?
7
Is there sufficient space for air flow and maintenance?
8
Is all the pre-charged nitrogen released before the field pipe connection started?
9
Has nitrogen been blown through the pipes during brazing?
10 Is there only 1 indoor unit connected to the CDU?
11
Is solenoid valve installed along the liquid line of condensing unit (compulsory for all
model to ensure no liquid compression)?
12 Does the field piping has the same diameter as the pipes coming from the CDU?
13 Is the suction pipe insulated?
14 Does the bends have enough bending radius?
15 Is the total pipe length less than 25m?
16 Is the height difference between indoor and outdoor unit within the specifications?
17 Are the oil traps in the vertical suction line correctly positioned?
18 Does the CDU capacity matches the indoor unit capacity?
19 Does the TXV capacity matches the indoor unit capacity?
20
Did the TXV sensing bulb positioned at 4, 8 or 12 o'clock and wrapped with copper strip
and insulated)?
21 Is the Maximum Operating Pressure (MOP) type expansion valve being installed?
22 Was inert, dry gas (e.g. Nitrogen) used for pressure testing?
23 Could the leak test pressures be reached?
24 Did the air tight maintained after at least 24 hours?
25 Could the vacuum condition (< -0.1 barg for 2 hours) be reached?
26 Did the pressure stayed stable for at least 1 hour, when turning off the vacuum pump?
27 Is the low pressure switch set correctly?
28 Is the overload relay for compressor set correctly (only applicable to LRMYS0180/250)?
29 Is there an earth connection foreseen?
30 Are all electrical terminal connections tight connected?
31 Is the crankcase heater been energized for minimum 12 hours before initial start up?
32 Is the refrigerant type correct for the intended use?
33
Is adequate liquid charge to high side introduced into the system before starting
compressor?
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Remarks: The system may only be started up if all questions can be answered with “Yes”.