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62-11039
8.10.2 Removing The Refrigerant Charge: Use
Micro “EVAC MODE”
When entering Evacuation Mode, the micro will home
the valves and then open the SMV and EVXV to 100%
open and energize UL1. The message center will dis-
play “ENTERING SERVICE MODE” and log an Evacu-
ation Mode Event in the Data Recorder.
Connect a refrigerant recovery system to the unit to
remove refrigerant charge. Refer to instructions
provided by the manufacture of the refrigerant recovery
system.
HOLD = TO EXIT.
8.11 REFRIGERANT LEAK CHECKING: Use
Micro “EVAC MODE”
a. If system was opened and repairs completed, leak
check the unit.
b. The recommended procedure for finding leaks in a
system is with an electronic leak detector. Testing
joints with soapsuds is satisfactory only for locating
large leaks, or pinpointing small leaks once a general
area has been located.
c. If system is without refrigerant, charge system with
refrigerant to build up pressure between 30 to 50
PSIG (2.0 to 3.4 Bar). Remove refrigerant drum and
leak check all connections.
CAUTION
Only a refrigerant drum containing R404a
should be connected to this refrigeration
unit in order to pressurize the system. How-
ever, dry nitrogen may be used for leak
checking. Any other gas or vapor will con-
taminate the system which will require
additional purging and evacuation of the
high side (discharge) of the system.
d. Remove refrigerant using a refrigerant recovery sys-
tem and repair any leaks. Evacuate and dehydrate
the unit. (Refer to Section 8.12) Charge unit with re-
frigerant. (Refer to Section 8.12.4)
e. Check for proper unit operation by running Pretrip
(Refer to Section 3.5).
8.12 EVACUATION AND CHARGING: Use
Micro “EVAC MODE”
8.12.1 General
Moisture is the deadly enemy of refrigerant systems.
The presence of moisture in a refrigeration system can
have many undesirable effects. The most common are
copper plating, acid sludge formation, “freezing-up” of
metering devices (EVXV or TXV) by free water, and
formation of acids, resulting in metal corrosion.
8.12.2 Preparation
a. Evacuate and dehydrate only after pressure leak
test. (Refer to Section 8.11)
b. Essential tools to properly evacuate and dehydrate
any system include a good vacuum pump (5 cfm /
8m
#
H volume displacement, P/N 07-00176-11) and
a good vacuum indicator such as a thermocouple
vacuum gauge (vacuum indicator). (07--00414--00)
NOTE
The use of a compound gauge is not recom-
mended because of its inherent inaccuracy.
c. Keep the ambient temperature above 60
_
F (15.6
_
C)
to speed evaporation of moisture. If ambient temper-
ature is lower than 60
_
F (15.6
_
C), ice might form be-
fore moisture removal is complete. Heat lamps or al-
ternate sources of heat may be used to raise system
temperature.
8.12.3 Procedure For Evacuation
a. Remove refrigerant using a refrigerant recovery sys-
tem.
b. The recommended method to evacuate and dehy-
drate the system is to connect three evacuation
hoses (Do not use standard service hoses, as they
are not suited for evacuation purposes.) as shown in
Figure 8--21 to the vacuum pump and refrigeration
unit. Also, as shown, connect an evacuation man-
ifold, with evacuation hoses only, to the vacuum
pump, electronic vacuum gauge, and refrigerant
recovery system.
c. With the unit service valves closed (back seated) and
the vacuum pump and electronic vacuum gauge
valves open, start the pump and draw a deep vac-
uum. Shut off the pump and check to see if the vac-
uum holds. This operation is to test the evacuation
setup for leaks, repair if necessary.
d. Midseat the refrigerant system service valves.
e. Then open the vacuum pump and electronic vacuum
gauge valves, if they are not already open. Start the
vacuum pump. Evacuate unit until the electronic vac-
uum gauge indicates 2000 microns. Close the elec-
tronic vacuum gauge and vacuum pump valves. Shut
off the vacuum pump. Wait a few minutes to be sure
the vacuum holds.
f. Break the vacuum with dry nitrogen. Raise system
pressure to approximately 2 PSIG (0.1 Bar).
g. Purge nitrogen from system.
h. Repeat steps e through g one time.
i. Evacuate unit to 500 microns. Close off vacuum
pump valve and stop pump. Wait five minutes to see if
vacuum holds. This checks for residual moisture and/
or leaks.
j. With a vacuum still in the unit, the refrigerant charge
may be drawn into the system from a refrigerant con-
tainer on weight scales. The correct amount of refrig-
erant may be added by observing the scales. Correct
charge will be found in Table 2-1.
Summary of Contents for VECTOR 1800 MT
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