CG-SVX06F-GB
18
Installation
Insulation
Insulate refrigerant lines from
building itself to avoid transmission
to building structure of vibrations
normally caused by pipework. Also
avoid bypassing the unit’s damping
system by fixing the refrigerant
lines or the electrical ducts very
rigidly. Vibrations may propagate
into building structure through rigidly
fixed refrigerant lines.
Pressure tests and leak detection
WARNING!
During operations, take
the following precaution:
1. Neither oxygen nor acethylene
should be used instead of
refrigerant and nitrogen to
detect leaks, otherwise a violent
explosion may occur.
2. Always use valves and
manometers to check the test
pressure in system. Excessive
pressure may either cause pipes
to rupture, damage unit, or cause
an explosion, causing possible
physical injury. Carry out liquid
line and hot gas pressure tests
in accordance with current
standards.
CAUTION:
Do not go more than
0.7 bar above the high pressure
switch setpoint. Introduce enough
refrigerant into circuit for 85 to
100 kPa pressure, pump-injecting
dry nitrogen, and raise pressure
to 100 kPa. Search possible leaks
using detector. This operation
should be carried out great care
throughout the system. If leaks are
detected, reduce system pressure,
and repair defective component.
Repeat test process, to check that
the repair can withstand rated
pressure.
Refrigerant charge
CCUN units are delivered with a
nitrogen holding charge and isolating
valves. After system pressure and
vacuum testing, fill up unit with
refrigerant according to the diameter
and the length of the refrigerant
piping work up to obtain the correct
subcooling temperature:
t subcooling = 5°C for a liquid
temperature of 40°C.
Warning: When connecting CCUN
liquid and discharge lines , ensure
that the copper end pipes between
the stop valve and the end end of
the piping are not under pressure
using a 1/4 SAE.
Oil charge - CCUN
Above 60 kg of refrigerant charge
per circuit, special care to the oil
level on compressor is required.
The operating oil level shall remain
above half of the oil sight glass. See
the unit nameplate for oil charges.
The oil level can only be evaluated
after 10 minutes OFF time of both
compressors of the circuit. See
sticker for the oil level located on
the compressor next to the oil sight
glass. See Compressor oil level at oil
equalization line figures at the end
of “General startup” chapter.
Note: The oil quantity necessary
for the split system has also to be
adjusted according to the diameter
and the length of the refrigerant
piping work.
CAUTION: Use exclusively POE oil
recommended by TRANE
Important note:
These operations have to be
performed by a specialist. The
results have to be written on a start
up record by the Trane engineer
or the client’s specialist who has
performed this start up. The quantity
of refrigerant and oil added are at
the client’s charges.
