Carrier AquaSnap 61WG Series - 18 Major System Components and Operation Data; Compressors; Lubricant; Evaporators and Water-Cooled Condensers

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18 - MAJOR SYSTEM COMPONENTS AND OPERATION DATA
18.1 - Compressors
The units use hermetic scroll compressors. The only refrigerant
permitted for these compressors is R-410A.
The compressors are not certied for mobile applications or use
in explosive environments.
For more information contact the manufacturer service team for
maintenance instructions.
IMPORTANT: All compressor and system pressure tests must
becarriedoutbyqualiedpersonnel,takingthegreatestcare
with potential dangers resulting from the pressures used,
andrespectingthemaximumoperatingpressurelimitonthe
high and low-pressure side, shown on the unit and
compressor name plates.
- Maximum operating pressure, low-pressure side :
3330 kPa (33.3 bar)
- Maximum operating pressure, high-pressure side : 4870
kPa (48.7bar)
- Maximum operating pressure, Low pressure side on
30WGA: 2820 kPa
- Maximum operating pressure High pressure side on
30WGA: 4420 kPa
Any modification or alteration such as soldering on the
compressor shell may invalidate the right to use the equipment.
Units using these compressors are installed in areas where
the temperature must be between 5 °C minimum and 40 °C
maximum. The temperature around the compressors must
not exceed 50 °C during unit shutdown cycles.
Shock absorbers are installed under the compressor feet.
18.2 - Lubricant
The compressors have the following factory lubricant charge:
polyolester oil (reference: POE 160SZ). Contact manufacturer to
order the oil. This lubricant must not be mixed with other lubricant
types.
Before start-up and after normal unit operation check that the oil
level is visible.
If an additional oil quantity is required to compensate the initial
low level in the compressors, top up the charge, using only the
permitted lubricant shown on the compressor name plate:
polyolester oil (ref: POE 160SZ).
NOTE: Only use oil approved for these compressors. Do not
re-use oil that has been exposed to the air.
ATTENTION: R22 oils are not compatible with R410A oils and
vice-versa.
18.3 - Evaporators and water-cooled
condensers
The evaporators and condensers are single-circuit plate heat
exchangers. They are tested and stamped for a maximum service
pressure of 5000 kPa, 4500 kPa on the refrigerant side and 1000
kPa on the water side.
The heat exchanger sizing for the whole range ensures a saturated
evaporating temperature of 4.5 °C and a condensing temperature
of around 38 °C with actual subcooling of around 4 K at the
condenser leaving side, based on nominal Eurovent conditions.
The water connections between the heat exchangers and the piping
of the hydraulic modules have quick-connect Victaulic couplings to
facilitate pump disassembly, if required.
A drain with a 1/4 turn valve is included in the leaving water of all
heat exchangers.
The evaporators have 19 mm thick polyurethane foam thermal
insulation. For option 86 (condenser insulation), the condensers
also have 19 mm thick polyurethane foam thermal insulation.
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 the manufacturer.
NOTES: Monitoring during operation, re-qualication, re-
testing and re-testing dispensation:
- Follow the regulations on monitoring pressurised
equipment.
- It is normally required that the user or operator sets up
and maintains a monitoring and maintenance le.
- If there are no regulations or to complement them follow
the control programmes of EN 378.
- If they exist follow local professional recommendations.
- Regularly inspect the condition of the coating (paint) to
detect blistering resulting from corrosion. To do this,
check a non-insulated section of the container or the
rust formation at the insulation joints.
- Regularly check for possible presence of impurities (e.g.
silicon grains) in the heat exchange uids. These impurities
maybe the cause of the wear or corrosion by puncture.
- Filter the heat exchange uid check and carry out internal
inspections as described in EN 378, annex C.
- In case of re-testing take the possible maximum pressure
difference of 25 bar into consideration.
- The reports of periodical checks by the user or operator
must be included in the supervision and maintenance le.
Repair
Any repair or modication of the plate heat exchangers is forbidden.
Only the replacement of the complete heat exchanger by an
original heat exchanger supplied by the manufacturer is permitted.
The replacement must be carried out by a qualied technician.
The heat exchanger replacement must be shown on the monitoring
and maintenance le.
Recycling
The plate heat exchanger is 100% recyclable. After use it contains
refrigerant vapours and oil residue.
Operating life
This unit is designed for:
- Prolonged storage of 15 years under nitrogen charge with a
temperature difference of 20 K per day.
- 900000 cycles (start-ups) with a maximum difference of 6 K
between two neighbouring points in the container, based on
12 start-ups per hour over 15 years at a usage rate of 57%.
18.4 - Electronic expansion valve (EXV)
The EXV is equipped with a stepper motor that is controlled via
the SIOB board.
18.5 - Refrigerant
Units operate exclusively with R-410A.