MULTIFUNCTIONAL UNITS RLC – Installation and maintenance manual
MUMRLCHEAT_REV01_1012_UK
Pag. 28 di 31
14
Start up
14.1
Preliminary controls
Before starting up the equipment it is very important to check that all the operations described in the paragraph “SETTING FOR START
UP” have been carried out correctly.
Moreover check that all the mechanical and electric equipment has been tightened perfectly. Particular attention should be paid to the
main components (compressor, exchangers, ventilators, electrical motors, and pump) if loose fastenings are found tighten them well
before starting up the machine.
The oil heaters have to be inserted at least 8 hours before starting up. Ensure that the compressors’ carter is hot. Open the compressor
valve and the cooling circuit one, which may have been shut for charging. Control all the machinery connected to the unit.
14.2
Start up
Start up the unit by pressing the ON/OFF button. About 20 seconds pass from the moment in which the start up request of the unit is
given to the moment in which the (first) compressor starts. Three hundred and sixty seconds will pass from the last shut down to the next
start up of the same compressor.
Check the rotation direction of the fans and rotative compressors. If it is not the right one, invert two supply phases. Ensure that all the
safety and control equipment is functioning correctly. Control the temperature of the water coming out of the evaporator and regulate the
control setting if necessary. Control the oil level.
14.3
Warm up of the plant for units air to water
In order to keep all the machine components in good condition and to optimise their use, during the warm up it is necessary to bring the
circuit to the right temperature before releasing cooling energy to the utilities.
The following steps must be followed for this to be carried out:
start up the machine
wait for the water in temperature to reach the running temperature
start up the consumers
Follow the above mentioned procedure every time the plant is stopped long enough for the water temperature contained in it to rise.
14.4
Control of the oil charge
All the compressors mounted on Thermocold units are factory charged with oil.
Scroll compressors have an oil sight glass to check the oil level. The oil level
must be between two oil markers which indicate the minimum and the
maximum level. In tandem and trio mode, pay attention to the oil level.
If the oil sight glass is not perfectly leveled between the parallel compressors,
but between the maximum and the minimum levels, it is a normal condition.
On the compressor, besides the oil sight glass there is an oil drain connection
and an oil fill connection and gauge port. To fill up the oil, there is a Schrader
connection 1 / 4”.
To add the oil, it is necessary to discharge the refrigerant from the unit,
collecting it in a proper cylinder, then do vacuum up to a pressure of about 6
Pa in order to eliminate the umidity from the circuit.
Then fill up the refrigerant in a low quantity and fill up the oil in te
correspondent connection.
Fill up the oil up to the oil sight glass is between the minimum and maximum
level indicated by the oil markers.
Fill up the refrigerant previously discharged.
Start up the compressor. Let the unit operate full load for 20 minutes and check
the oil level.
