Trane CenTraVac Duplex CDHE, Operation & Maintenance Manual

Page: 99 / 116

99
CDHF-SVU01C-EN
Maintenance
Refrigerant Charge
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WARNING
Contains Refrigerant!
System contains oil and refrigerant
and may be under positive pressure.
Recover refrigerant to relieve
pressure before opening the system.
See unit nameplate for refrigerant
type. Do not use non-approved
refrigerants, refrigerant substitutes,
or refrigerant additives.
Failure to follow proper procedures
or the use of non-approved
refrigerants, refrigerant substitutes,
or refrigerant additives could result
in death or serious injury or
equipment damage.
The refrigerant charging procedure
for Trane centrifugal chillers is:
1. If water is present in the tubes,
break machine vacuum with
refrigerant vapor, or circulate
water, to avoid tube damage.
2. Always use refrigerant compatible
hoses or copper-tubing with self-
sealing connections or shut-off
valves.
3. Transfer the refrigerant using one
of the following (listed in order of
preference):
a. An approved Trane low-
pressure refrigerant recovery
and recycle unit.
b. The available pressure
differential.
c. Gravity. (Use a return vent line
to refrigerant drums to equalize
pressure.)
5. Do not use dry nitrogen to push
refrigerant into the chiller as was
common practice in the past. This
will contaminate the charge and
require excessive purging, which
will result in unnecessary release
of refrigerant.
6. Weigh in the proper charge.
7. Use recovery and recyle unit or
vacuum pump to evacuate hoses;
discharge outdoors.
8. If refrigerant is supplied in new
returnable cylinders, be sure and
refer to General Service Bulletin
CVHE-SB-48B for information on
returning cylinders. This service
bulletin is available at the nearest
Trane office.
Depending on the chiller duty,
contact a qualified service
organization to determine when to
conduct a complete examination of
the unit to discern the condition of
the compressor and internal
components.
Note: If your chiller is covered by a
Trane extended warranty, the terms of
that warranty may require that the
procedures listed in the Periodic
Maintenance section of this manual
be followed for your extended
warranty to remain in force. The
terms may also require that the chiller
be inspected by a Trane authorized
warranty agent every
4-years or 40,000 operating hours,
whichever occurs first. This
inspection will include, at a
minimum, a review of the annual
inspection checklists and the daily
operating logs, as well as
performance of a leak test and a
general inspection of the chiller. The
owner is then required to follow the
recommendations made as a result of
this inspection at the owners
expense.