Trane CGA Series, Установка, эксплуатация и обслуживание

Страница: 21 / 24

Start-up
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.
Starting 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 rotary 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.
Warm up of the plant for air-to-water units
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.
Control of the oil charge
All units Trane have compressors loaded with oil at
the factory. The scroll compressors are equipped with
an oil sight glass and from which can check the level.
The exact level must be between the two notches that
indicate the minimum and maximum level. Close to oil
sight glass on the compressor there is a connection
for the oil drain connection for the eventual charge
refilling. For topping up oil, there is attack Schrader
from 1/4 ". To operate the addition of oil, it is
necessary to discharge the refrigerant, recovering in
the bottles, subsequently perform the vacuum to a
pressure of approximately 6 Pa in order to eliminate
any trace of moisture from the circuit. Then recharge
refrigerant in the unit with a small amount of
refrigerant and top up the oil from the special
connection for filling.
Add oil until the indicator sight is not flat in the
maximum and minimum limits specified by the
respective notches. At this point recharge the amount
of the refrigerant discharged in accordance with the
foregoing methods. Restart the compressor. Run for
20 minutes at full load and check the oil level.