Carrier Aquasnap 30RAP010, Данные о продукции

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65
MINIMUM AND MAXIMUM COOLER FLOW RATES
Select concentration based on either burst or freeze pro-
tection as dictated by the application. If the chiller does not
operate during the winter, nor is a start-up expected, a
burst protection concentration is recommended. This
concentration may not be high enough to pump the fluid
through the unit. Burst protection is typically a lower con-
centration that will provide better performance from the
machine. If the chiller does operate during winter, a freeze
protection concentration is recommended. This concentra-
tion will be high enough to keep the fluid in a condition
that it can be pumped at low ambient conditions.
Consult glycol fluid manufacturers for burst protection
recommendations and fluid specifications.
High ambient temperature operation
High outdoor ambient chiller start-up and operation is pos-
sible for standard 30RAP chillers at ambient temperatures
up to 120 F (50 C) at nominal voltage. The unit will addi-
tionally be able to stay running at reduced capacity up to
125 F (52 C).
Low ambient temperature operation
Units will operate down to –20 F (–29 C) on size 010 and
015 units, 45 F (7 C) on size 018-030 units, and 32 F
(0° C) on size 035-090 units as standard.
Operation to –20 F (–29 C) for size 018-090 units
requires optional Motormaster ® V condenser head pres-
sure control (included as standard on size 010 and 015
units) as well as wind baffles and hot gas bypass or digital
compressor option. Inhibited propylene glycol or other
suitable corrosion-resistant anti-freeze solution must be
field supplied and installed in all units for unit operation
below 32 F (0° C). Solution must be added to fluid loop to
protect loop down to 15° F (8° C) below minimum operat-
ing ambient temperature. Concentration should be based
on expected minimum temperature and either “Burst” or
“Freeze” protection levels. At least 6 gal. per ton (6.5 L
per kW) of fluid volume is the recommended minimum for
a moderate system load.
NOTE: In order for a chiller to operate at –20 F (–29 C)
ambient temperature, the minimum load on the chiller
must be above the minimum step of unloading.
NOTE: As an alternative to requiring a glycol solution, the
cooler may be remotely located. Burying refrigerant lines is
never permitted.
Altitude correction factors
Correction factors must be applied to standard ratings
at altitudes above 2000 ft (610 m). Use the NACO Pack-
aged Chiller Builder to determine the altitude effect on
peformance.
Water system overview (closed loop systems
only)
The 30RAP chillers are designed for use with closed sys-
tems, meaning that there is no more than one water-air
interface in the water loop. Cooling tower loops, for
example, have two water-air interfaces (sump and nozzles)
and would thus be classified as open, whereas a correctly
designed chilled water loop with the only water-air inter-
face being in the expansion tank is closed. Since closed
and open water systems behave very differently, the follow-
ing assumes that the chilled water loop is closed. A system
installed incorrectly such that air is not handled properly —
pipe leaks, vent leaks, air in pipes, etc. — may behave as
an open system and thus have unsatisfactory operation.
Pump seal wear can also cause leaks that cause poor sys-
tem operation.
Proper closed system design and installation procedures
should be followed closely. The system must be con-
structed with pressure tight components and thoroughly
tested for installation leaks. Factory-supplied hydronic sys-
tems are available with single or dual (for back-up) pumps.
The factory-installed system includes all of the components
within the dashed lines shown in the figure on page 44.
Installation of water systems should follow sound engi-
neering practice as well as applicable local and industry
standards. Improperly designed or installed systems may
cause unsatisfactory operation and/or system failure. Con-
sult a water treatment specialist or appropriate literature
for information regarding filtration, water treatment, and
control devices. A typical installation with components that
30RAP
SIZE
MINIMUM COOLER FLOW
RATE (gpm)
MAXIMUM COOLER FLOW
RATE (gpm)
MINIMUM COOLER FLOW
RATE (l/s)
MAXIMUM COOLER FLOW
RATE (l/s)
010 13 50 0.8 3.2
015 17 66 1.1 4.2
01 8 20 78 1.3 4.9
020 23 91 1.5 5.7
025 28 112 1.8 7.1
030 33 133 2.1 8.4
035 41 164 2.6 10.3
040 47 186 3.0 11.7
045 53 209 3.3 13.2
050 57 228 3.6 14.4
055 63 251 4.0 15.8
060 68 270 4.3 17.0
070 87 310 5.5 19.6
0 8 0 98 350 6.2 22.1
090 107 382 6.8 24.1
IMPORTANT: Glycol anti-freeze solutions are highly
recommended since heater tapes provide no protec-
tion in the event of a power failure.