Carrier NDK33BN0KB, Operation & Service Manual

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62-61753-21 8-1
SECTION 8 -
SERVICE
WARNING
LogiCOLD microprocessor equipped units
may start automatically at any time the
START/RUN-OFF switch (SROS) is not in
the OFF position. Also, the unit may be fit-
ted with two way communication equip-
ment that will allow stating of the unit from
a remote location even though the SROS is
in the off position.
WARNING
Be aware of HIGH VOLTAGE supplied at
the power plug or from the generator.
When performing service or maintenance
procedures: ensure any two way commu-
nication is disabled in accordance with the
manufacturers instruction, ensure the
START/RUN-OFF switch is in the OFF posi-
tion and, whenever practical, disconnect
the high voltage source and disconnect the
negative battery connection. NEVER dis-
assemble the generator: HIGH MAGNETIC
FIELD INSIDE! This field can interfere with
cardiac implants such as pacemakers and
defibrillators.
CAUTION
Unit uses R-404A or R-452A and POE oil.
The use of inert gas brazing procedures is
mandatory for all Carrier Transicold refrig-
eration units; otherwise compressor failure
will occur. For more information Refer to
Technical Procedure 98-60068-00 Inert Gas
Brazing
CAUTION
R-452A is an A1 non-flammable refrigerant
blend; however certain of its constituents
are considered A2L midly flammable.
For this raison, it is imperative that the sys-
tem of a vector unit utilizing R-452A refrig-
erant be reclaim to a sufficient vaccum to
ensure all residual refrigerant is removed
from the system
Follow the R-452A refrigerant reclaim / re-
covery procedure before performing any
“Hot work” including but not limited to
brazing or welding on a unit that has been
charged with R-452A, to prevent flare up of
residual A2L refrigerant constituents
Refrigerant must be reclaimed until equip-
ment gauge indicates 20 inHG (-0.6bar) of
vacuum.
Refer to Section 8.5.2Removing The R-
452A Refrigerant Charge
Refer to the Service Bulletin SB06-16 for
additional information
NOTE
To avoid damage to the earth’s ozone layer,
use a refrigerant recovery system whenever
removing refrigerant. When working with re-
frigerants you must comply with all local gov-
ernment environmental laws.
8.1 SECTION LAYOUT
Service procedures are presented herein beginning
with Scheduled Maintenance (Section 8.2) & PreTrip
(8.3) then Refrigerant System Service (8.5) followed
by Refrigerant System Component Service (8.6) and
then Electrical System Component Service (8.7). Refer
to the Table Of Contents to locate specific topics.
8.2 SCHEDULED MAINTENANCE
For the most reliable operation and for maximum life,
your unit requires regular maintenance. This includes
oil and filter changes, fuel and air filter replacement,
coolant replacement and pretrip inspections. Mainte-
nance should be performed according to the following
schedule:
These maintenance schedules are based on the use
of approved oils and regular pretrip trip inspections of
the unit. Failure to follow the recommended mainte-
nance schedule may affect the life and reliability of the
refrigeration unit.