English 05/09
ACCURATE AX - AW - AD - AT - AF
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It must be stressed that both the standard air-cooled condensers
and dry coolers supplied by the manufacturer are not fitted as
standard with the condenser fan speed controller, and are only
electrically connected to the disconnect switch for local mainte-
nance operations (for further details, see the manual on the out-
door air-cooled condensers and dry coolers).
Therefore, both of these outdoor units can be powered directly
via the disconnect switch with primary voltage, however this
means their operation is not controlled.
If the indoor units used are the ACCURATE in MODULATING
version, complete with condenser fan speed controller, the out-
door air-cooled condenser and/or dry cooler can be connect-
ed/powered directly from the panel on the indoor unit (the con-
nection cable is not supplied by the manufacturer).
The instructions on the connection and the size of the power
cables are provided by the manufacturer on the wiring diagram
on the indoor unit. For both single and dual circuit models, just
one connection/power cable is required between the indoor and
outdoor unit. The voltage delivered will be modulated by the con-
denser control unit installed on the indoor unit, based on the cur-
rent requirements of the system.
This ensures optimum operating conditions.
The condenser control unit is also featured as standard on the
versions of the indoor units for low outside temperatures (-
45°C).
There are two types of speed controllers used, based on the size
in question. Both are positioned and installed on the indoor unit
refrigerant circuit.
ELECTRICAL CONNECTION OF THE OUTDOOR AIR-COOLED
CONDENSER BRC AND/OR THE OUTDOOR DRY COOLER BDC
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The ACCURATE units are provided , for MODULATING version,
with fan speed control for condensing unit (BRC) or Dry Cooler
(BDC), in order to maintain the condensing pressures within pre-
fixed values, for any given load on the unit, whilst at the same time
reducing power consumption and noise levels of the fan motors.
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1) Frames 1 e 2 type AX - AW (models 07-10-15-18)
FAN SPEED REGULATOR
CONDENSING CONTROL
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The ACCURATE type AX e AW for models 07-10-15-18 the reg-
ulator direct mounting via pressure connection or indirect
mounting on housing bracket with capillary tube on discharge gas
tube.
The regulator is factory set to a specific pressure (see tab.1 ). If
adjustment is needed, refer to instructions for proper procedure.
Improper adjustment may result in system damage or failure.
If desired set point differs from factory setting, follow the
procedure for setting before any installation:
1) Remove sealing plug and insert 2mm or 5/64" allen key into
setting screw.Turn allen key clockwise (+) or counterclockwise
(-) to readjust the setting (see Fig. 2).
• Do not exceed safe working pressure.
• Do not touch housing if speed control is working because
there might be high temperatures.
• Do not turn setting screw more than 3 turns clockwise (+3).
2) After adjustment insert sealing plug and make sure that it is
properly fitted. IP65 protection requires firmly sealed plug.
Note: Partial voltage is applied even if motor is not running. Dis-
connect voltage for service on motor or on regulator.
FACTORY SET
Refrigerants
R407C
R410A
Cond. temp.°C
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