HIdRos 1LSA.014A-1A - 7.3 Periodical checks; 7.4 Refrigerant circuit repair

Rev. A 07-2018
45
MTEC.3630.GB-A-1 Operation and maintenance manual LSA series English
LSA/HP+LJKHI¿FLHQF\DLUWRZDWHUKHDWSXPSV
(YHU\PRQWKV
It is advisable to perform periodic checks in order to verify the correct working of the unit.
• Check that safety and control devices work correctly as previously described.
• &KHFNDOOWKHWHUPLQDOVRQWKHHOHFWULFERDUGDQGRQWKHFRPSUHVVRUDUHSURSHUO\¿[HG
• Check and clean the sliding terminals of the contactors.
• Check for water leaks in the hydraulic system.
• &KHFNFRUUHFWRSHUDWLRQRIWKHÀRZVZLWFKDQGFOHDQWKHVWUDLQHUVRQWKHSLSHZRUN
• Check the compressor crankcase heater has the proper supply and is functioning correctly.
• &KHFNWKHVWDWHRIWKH¿QQHGFRLOUHPRYLQJDQ\GHEULVRUOHDYHV,ISRVVLEOHXVHFRPSUHVVHGDLUWREORZWKURXJKLQWKHRSSRVLWHGLUHFWLRQ
WRWKHDLUÀRZ,IWKHFRLOLVKHDYLO\FORJJHGFOHDQLWZLWKDORZSUHVVXUHZDVKHUWDNLQJFDUHWRDYRLGGDPDJLQJWKHDOXPLQLXP¿QV
• &KHFNWKHVWDWHRIWKH¿QQHGFRLOVPHWDOOLF¿OWHUV2SWLRQDOUHPRYLQJDQ\GHEULVRUOHDYHV,ISRVVLEOHXVHFRPSUHVVHGDLUWREORZ
WKURXJKLQWKHRSSRVLWHGLUHFWLRQWRWKHDLUÀRZ,IWKHFRLOLVKHDYLO\FORJJHGFOHDQLWZLWKDORZSUHVVXUHZDVKHUWDNLQJFDUHWRDYRLG
GDPDJLQJWKHDOXPLQLXP¿QV
• Check mounting of fan blades and their balancing.
• Check the colour of the sight glass core (green=no moisture, yellow=moisture present): if it has a yellow colour, change the refrigerant
¿OWHU
(QGRIVHDVRQVRUXQLWVZLWFKHGRII
If the unit is to be left out of commission for a long period, the hydraulic circuit should be drained down. This operation is compulsory if the
DPELHQWWHPSHUDWXUHLVH[SHFWHGWRGURSEHORZWKHIUHH]LQJSRLQWRIWKHÀXLGLQWKHFLUFXLWZDWHURU*O\FROPL[
Never use oxygen instead of nitrogen: explosions may occur.
7.4 Refrigerant circuit repair
For leak detection, the system should be charged with nitrogen using a gas bottle with a pressure reducing valve, until 15 bar pressure is
UHDFKHG$Q\OHDNDJHLVGHWHFWHGXVLQJDEXEEOHOHDN¿QGHU,IEXEEOHVDSSHDUGLVFKDUJHWKHQLWURJHQIURPWKHFLUFXLWEHIRUHEUD]LQJXVLQJ
the proper alloys.
Site assembled refrigerant circuits must be assembled and maintained carefully, in order to prevent malfunctions.
Therefore:
• $YRLGRLOUHSOHQLVKPHQWZLWKSURGXFWVWKDWDUHGLIIHUHQWIURPWKDWVSHFL¿HGDQGWKDWDUHSUHORDGHGLQWRWKHFRPSUHVVRU
If the refrigerant circuit is to be emptied, all the refrigerant must be recovered using the correct equipment.
The start-up operations should be performed in compliance with all requirements of the previous paragraphs.
All of the operations described in this chapter MUST BE PERFORMED BY TRAINED PERSONNEL ONLY. Before
commencing service work on the unit ensure that the electric supply is disconnected. The top case and dischar-
ge line of compressor are usually at high temperature. Care must be taken when working in their surroundings.
$OXPLQLXPFRLO¿QVDUHYHU\VKDUSDQGFDQFDXVHVHULRXVZRXQGV&DUHPXVWEHWDNHQZKHQZRUNLQJLQWKHLU
VXUURXQGLQJV$IWHUVHUYLFLQJUHSODFHWKHFRYHUSDQHOV¿[LQJWKHPZLWKORFNLQJVFUHZV
7.3 Periodical checks