30RB/30RQ
GB - 10
Electrical connections and refrigerant charge
Electrical connections
WARNING:
To prevent electrical shock or equipment damage, make sure
disconnects are open before electrical connections are made. If this
action is not taken, personal injury may occur.
Power supply cable size and external connection must be made by
the installer according to the unit installation characteristics and the
applicable standards. The power supply and earth multicore cable of
the device has to be connected to the general disconnector by routing
the cable through the grommet installed in the device, after removing
the access panel/s. The maximum section allowable for exible copper
cable is 25 mm
2
. Before connection, check that phase sequence
L1 – L2 – L3 is correct.
The table below should be considered as a
reference and does not involve Carrier responsibility.
Unit
30RB/30RQ
017
30RB/30RQ
021
30RB/30RQ
026
30RB/30RQ
033
Cable section 5 x10 mm 5 x16 mm
Power supply cable H07 RN-F
Fuse (type "gG") 25 A 32A 40 A 50 A
Take special care when making the earth connection.
The maximum permitted voltage and current imbalance is 10% of the
values indicated in Table II.
Contact your local power company for correction of an incorrect line
voltage.
WARNING:
Operation of the unit on improper line voltage constitutes abuse and is
not covered by the Carrier warranty.
IMPORTANT:
To ensure the correct unit power supply (cable entry, conductor cross
section, protection devices etc.), consult the electrical data table, the
wiring diagram supplied with the unit and the applicable standards
concerning the installation of air conditioning equipment.
Never operate a unit if the voltage imbalance exceeds 2%.
The following formula must be used to determine the percentage of
voltage imbalance.
Sbilanciamento delle tensioni (%) =
Max. scostamento dalla tensione media x 100
———————————————————————————-
Tensione media
Voltage imbalance (%) =
Largest deviation from average voltage x 100
———————————————————————————-
Average voltage
Example:
Nominal supply: 400-3-50
AB = 404 V
BC = 399 V
AC = 394 V
Average voltage = 404 + 399 + 394 = 399 ≈ 400 V
3
Determine maximum deviation from average voltage
AB = 404 - 400 = 4
BC = 400 - 399 = 1
AC = 400 - 394 = 6
Largest deviation is 6 volts. Percentage voltage imbalance is therefore:
6 x 100 = 1,5 %
400
CAUTION:
The installer must install protection devices, as required by the
applicable legislation.
Liquid refrigerant charge
Checking the charge
WARNING:
When adjusting the refrigerant charge always ensure that water
is circulating in the heat exchanger to prevent any possibility of
freezing up. Damage caused by freezing is not covered by the
product warranty.
30RB-RQ units are shipped with a full operating charge of refrigerant.
Refer to Table I.
If it is nevertheless necessary to add more refrigerant, run the unit for
some time in cooling mode and then slowly add liquid refrigerant into
the suction side until there are no bubbles in the sight glass.
30RB-RQ units use a R-410A refrigerant charge. For your information,
we are reproducing here some extracts from the o cial publication
dealing with the design, installation, operation and maintenance
of air conditioning and refrigeration systems and the training of
people involved in these activities, agreed by the air conditioning and
refrigeration industry.
Refrigerant guidelines
Refrigeration installations must be inspected and maintained regularly
and rigorously by specialists. Their activities must be overseen and
checked by properly trained people.
To minimise discharge to the atmosphere, refrigerants and lubricating
oil must be transferred using methods which reduce leaks and losses to
a minimum.
• Leaks must be repaired immediately.
• Service valves tted to the ow and return lines permit charge transfer
to a suitably arranged external container.
• It is indispensable to use a dedicated transfer station.
• Compressor lubricating oil contains refrigerant. Any oil drained from
a system during maintenance must therefore be handled and stored
accordingly.
• Refrigerant under pressure must never be discharged to the
atmosphere.
Recharging liquid refrigerant
The refrigerant R-410A operates at pressures 50%-70% higher than R-22.
Make sure that the maintenance equipment and the spare parts are t
for R-410A.
The cylinders that contain R-410A are pink.
The cylinders that contain R-410A are provided with a dip tube that
allows uid to escape from the cylinder both when in upright position
and when turned upside down.
Unit R-410A should be charged with liquid refrigerant. Apply a common
ow regulator available on the market to the hose pipe to vaporize the
liquid refrigerant before it enters the unit.
R-410A, like other HFCs, is only compatible with the oils selected by the
manufacturer of compressors(POE).
NOTE:
Regularly carry out leak checks and immediately repair any leak found.
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