Major System Components; Compressors; Lubricant; Condensers - Carrier AquaSnap 30RB Series Installation, Operation And Maintenance Instructions

10 - MajOR SYSTEM COMPONENTS

10.1 - Compressors

30RB units use hermetic scroll compressors. Each compressor
is equipped with a crankcase oil heater, as standard, complete
with a safety device that prevents compressor start-up if
there is a fault at the heater.
As standard, each compressor is equipped with a discharge
valve for the whole range and with a suction valve for units
30RB 162-262.
Each compressor sub-function is equipped with:
• Anti-vibration mountings between the unit chassis
and the chassis of the compressor sub-function.
• Suction piping equipped with openings (not visible) to
ensure an even oil level between all compressors.
• A pressure safety switch at the discharge line of each
circuit.

10.2 - lubricant

The compressors installed in these units have an oil charge
of 6.7 l to ensure their correct operation.
The oil level check must be done with the unit switched off,
when then suction and discharge pressures are equalised.
The level must be full (higher than or equal to 3/4 of the
sight-glass) after two hours shut-down. If this is not the
case, there is an oil leak in the circuit. Search and repair the
leak, then recharge oil, so that it reaches a high sight glass
level, when the unit is recharged with refrigerant. The
refrigerant dissolved in the oil raises the level - do not add
any more oil.
ATTENTION: Too much oil in the circuit can cause a
unit defect.
NOTE: Use only oils which have been approved for the
compressors. Never use oils which have been exposed to air.
CAUTION: R-22 oils are absolutely not compatible with
R-410A oils and vice versa.

10.3 - Condensers

The 30RB coils are micro-channel condensers made entirely
of aluminium. For some options (see chapter 11.7 - Other
options and accessories) optional coils with internally
grooved copper tubes with aluminium fins are also
available.

10.4 - Fans

The fans are axial Flying Bird fans equipped with rotating
shroud and made of composite recyclable material. Each
motor is fixed with transverse supports. The motors are
three-phase, with permanently lubricated bearings and
insulation class F.

10.5 - Electronic expansion valve (EXv)

The EXV is equipped with a stepper motor (2785 to 3690
steps, depending on the model) that is controlled via the
EXV board. It is also equipped with a sight-glass that
permits verification of the mechanism movement and the
presence of the liquid gasket.

10.6 - Moisture indicator

Located on the EXV, permits control of the unit charge and
indicates moisture in the circuit. The presence of bubbles
in the sight-glass indicates an insufficient charge or non-
condensables in the system. The presence of moisture
changes the colour of the indicator paper in the sight-glass.

10.7 - Filter drier

The role of the filter drier is to keep the circuit clean and
moisture-free. The moisture indicator shows, when it is
neces-sary to change the element. A difference in
temperature between the filter inlet and outlet shows that
the element is dirty.

10.8 - Evaporator

10.8.1 - 30RB 162-262 "B" standard units
The evaporator is a plate heat exchanger with refrierant
circuits. The water connections of the heat exchanger are
Victaulic connections.
The evaporator has a thermal insulation of 19 mm thick
polyurethane foam. As an option it can be protected
against frost (option 41: evaporator frost protection).
The products that may be added for thermal insulation of
the containers during the water piping connection procedure
must be chemically neutral in relation to the materials and
coatings to which they are applied. This is also the case for
the products originally supplied by Carrier.
NOTES: Monitoring during operation:
• follow the regulations on monitoring pressurised
equipment.
• It is normally required that the user or operator sets
up and maintains a monitoring and maintenance file.
• follow the control programmes of EN 378-2, annexe D.
• If they exist follow local professional recommendations.
• Regularly check for possible presence of impurities
(e.g. silicon grains) in the heat exchange fluids. These
impurities maybe the cause of the wear or corrosion
by puncture.
• The reports of periodical checks by the user or operator
must be included in the supervision and maintenance
file.
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