42 Carrier Yileng - Shanghai, China
General visual inspection for any signs of deterioration.
10.2 - Level 2 maintenance (see note)
This level requires specific know-how in the electrical, hydronic and mechanical fields. It is possible that these
skills are available locally: existence of a maintenance service, industrial site, specialized subcontractor. In these
cases, the following maintenance operations are recommended. Carry out all level 1 operations, then:
• At least once a year tighten the power circuit electrical connections (see tightening torques table).
•Check and re-tighten all control/command connections, if required (see tightening torques table).
• Remove the dust and clean the interior of the control boxes, if required.
• Check the presence and the condition of the electrical protection devices.
• Check the correct operation of all heaters.
• Replace the fuses every 3 years or every 15000 hours
• Check the height of the anti-vibration mountings (located between the compressor rails and the unit chassis) after
5 years of operation, and then each year. When the total minimum height of the mountings is less than 28 mm
replace the mountings.
• Check the water connections.
• Purge the water circuit (see chapter “Water flow control procedure”).
• Clean the water filter (see chapter “Water flow control procedure”).
• Fully clean the condensers with a low-pressure jet and a bio-degradable cleaner (counter-current cleaning -see
chapter “Condenser coil - level 2).
• Replace the stuffing box packing of the pump after 10000 hours of operation.
• Check the unit operating parameters and compare them with previous values.
• Keep and maintain a maintenance sheet, attached to each HVAC unit.
All these operations require strict observation of adequate safety measures: individual protection garments,
compliance with all industry regulations, compliance with applicable local regulations and using common sense.
10.3 - Level 3 (or higher) maintenance (see note)
The maintenance at this level requires specific skills/ approval/tools and know-how and only the manufacturer, his
representative or authorized agent are permitted to carry out these operations. These maintenance operations
concern for example:
• A major component replacement (compressor, evaporator)
• Any intervention on the refrigerant circuit (handling refrigerant)
• Changing of parameters set at the factory (application change)
• Removal or dismantling of the HVAC unit
• Any intervention due to a missed established maintenance operation
• Any intervention covered by the warranty
NOTE: Any deviation or non-observation of these maintenance criteria will render the guarantee conditions
for the HVAC unit nul and void, and the manufacturer, Carrier will no longer be held responsible.
10.4 - Tightening torques for the main electrical connections
Screw on bus bar, customer connection
Soldered screw PE, customer connection(M12)
Tunnel terminal screw, compressor contactor
Tunnel terminal screw, current transformer
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