Start-Up Preliminary Procedures - Trane CXAO Installation Operation & Maintenance

Start-up preliminary procedures

5.3 Start-up preliminary procedures
Initial controls
Before starting the unit, even only momentarily, all
the unitry supplied by the chilled water, like the air
handling units, pumps, etc. have to be checked. The
pump auxiliary contacts and the fl ow switch have to
be connected to the control panel as indicated in the
electrical diagram. Before carrying out interventions on
the valve regulations, loosen the relevant valve gland.
Charge the water circuit progressively. Start up the water
pump of the evaporator with the calibration valve shut
and then slowly open it.
Discharge the air from the high points of the water circuit
and check the direction of the water fl ow. Carry out
calibration of the fl ow by using a measurer (if present or
available) or by means of a combination of the readings
of the manometers and the thermometers. In the starting
phase calibrate the valve on the pressure difference read
on the manometers, carry out drainage of the tubes
and then carry out fi ne calibration on the temperature
difference between the water in and the water out. The
regulation is calibrated in the factory for water in to the
evaporator at 12°C and water out at 7°C. With the general
switch open, check that the electrical connections are
tightly clamped. Check for any possible refrigerant leaks.
Check that the electrical data on the label correspond to
those of the mains supply. Check that the thermal charge
available is appropriate for starting.
38
presa alta pressione
High pressure port
Low pressureport
High pressure
Vacuum meter
manometro vacuometro
gauge
alta pressione
manometro
Low pressure
bassa pressione
gauge
Refrigerant seals control
Units are sent with the complete charge of refrigerant
and are at a suffi cient pressure to check the seal after
installing. If the system were not under pressure, blow
refrigerants (vapour) into it until pressure is reached and
look for leakage.
After having eliminated the leakage, the system has to
be dehydrated with a vacuum pump up to at least 1mm
Hg - absolute pressure (1 Torr o 133.3 Pa). This is the
minimum recommended value to dehydrate the plant.
WARNING! do not use the compressor to vacuum the
system.
Refrigerant charge check
Units are supplied with a complete charge of refrigerant.
If bubbles can be seen through the peephole with the
compressor running with a full charge and steadily, it
means that the refrigerant charge is insuffi cient.
WARNING! While refrigerant is being added do not
exclude any control system and let the water circulate in
the evaporator to avoid the formation of ice.
Vacuum pump
pompa del vuoto
trappola olio
Oil trap
RF-SVX003A-GB