Thermo King CRR-40 119, Руководство пользователя

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Refrigeration Maintenance and Service Operations
140
7. The regulator should have two gauges; one to
read tank pressure, the other to read line
pressure. Properly maintained equipment will
allow leak testing, purging, or dehydration to
be done safely.
Dehydration, pressure testing, purging and
soldering can be accomplished with the use of dry
nitrogen (N
2
). The proper equipment and
application of equipment is of greatest
importance.
Procedure
1. Attach gauge manifold set (refer to “Gauge
Manifold Set Attachment and Purging” for
proper procedure for connecting to
compressor).
2. Close both hand valves on the gauge manifold
(front seated).
3. Connect charging hose to a source of nitrogen.
Adjust pressure regulator to the proper
pressure for the required procedure.
4. Purge system high side to low side.
The following procedures should utilize the
following MAXIMUM gas pressure:
• Leak Testing: 1030 to 1200 kPa, 10.3 to 12.0
bar, 150-175 psig,
• Purging/Dehydration: 70 to 140 kPa, 0.7 to
1.4 bar, 10-20 psig,
• During Soldering: 35 kPa, 0.35 bar, 5 psig.
Compressor Replacement
Removal
1. Remove the compressor compartment bracket.
Close the liquid line service valve and pump
down the low side to - 35 kPa, -0.35 bar, 10 in.
vacuum. Break the vacuum with nitrogen
between 10 and 20 kPa, 0.10 and 0.20 bar, 1
and 3 psig.
NOTE: If the compressor does not operate,
or the compressor is unable to pump the low
side down, the refrigerant charge must be
reclaimed before service can be performed
on the refrigeration system.
2. Front seat the discharge valve.
3. Remove discharge service valve, suction
service valve, and liquid injection line from
the compressor.
4. Disconnect the wire connector for the high
pressure cutout switch.
CAUTION: Nitrogen (N
2
) is under 15,170
kPa, 151.70 bar, 2200 psig, or greater.
Pressure is for full cylinder at 21 C (70 F).
DO NOT use Oxygen (O
2
), acetylene or
any other types of pressurized gas on
refrigeration systems or any component of
a system.
1. Line Pressure
2. Tank Pressure
3. Tank
4. Pressure Test Line to System
5. Safety Valve
6. Pressure Regulator
Figure 48: Typical Pressurized Gas Bottle with
Pressure Regulator and Gauges
AJA1313
CAUTION: Any time the discharge valve
is front seated, disconnect the unit power
source to prevent accidental compressor
start-up.