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Application Guidelines
3.4 Ambient conditions
3.5 Limits for voltage
supply
16
FRCC.PC.044.A6.02
Application range
Red line on the application envelope indicates
maximum safe ambient temperature for low load
(30-50 rps) and high ambient conditions (above
32 °C for R448A/R449A, 32 °C for R404A and
above 40 °C for R407A/F.
In case low unit capacity required (30-50 rps)
at high ambient temperatures controller will
increase compressor speed up to minimum safe
Minimum and maximum evaporating and
condensing temperatures as per the operating
Other operating limits:
Discharge gas temperature
Evaporator outlet superheat
Suction gas superheat at compressor inlet
Special attention to suction line insulation will
have to be secured in order to:
• Avoid too high superheat during high ambient
conditions that can create too high discharge
gas temperature.
Optyma
™
Plus INVERTER units can be used with
ambient temperature from -15°C to 43°C. For
altitudes above 2000 m, contact Danfoss. The
other working conditions should be within the
limits of application envelope.
To assure that the unit can start during cold
conditions the parameter "c94 LpMinOnTime" can
be used. If this parameter is set to a value that
is higher than 0 and the ambient temperature
(Tamb) is below 5°C, the internal transmitter "LP
switch c75" and "pump down limit c33" will be
overridden for the number of seconds defined
in "c94 LpMinOnTime". And the value for Min on
time for the compressor will be set to the largest
of the values of "c94 MinLpOnTime" and "c01 Min.
on time".
Voltage limits: Min:
360 V Max 440 V
Phase asymmetry:
±3%
Frequency limits:
50Hz ±1%
speed at high temperature. This minimum safe
speed at high temperature is factory preset to
50 rps (controller parameter c47: Start speed
of the compressor). It is not recommended to
decrease setting of parameter c47 below 50 rps
as this can lead to work of compressor at low
speed during high ambient conditions which can
reduce lifetime of the unit.
envelopes – compressor should work inside
application envelope.
Recommendation
°C maximum
125
above 6K (to avoid liquid flood back)
within the limits shown on the application envelope
• Avoid too low superheat during low ambient
conditions that can create condensation of
refrigerant in suction line.
The CDS803 drive forces the compressor to 50rps
(see Optyma Controller parameter c47) for 30s
always at compressor start, to ensure proper oil
return at low load and short runtimes. The start
delay time can be modified via drive parameter
1-71, if a proper oil return is always ensured
without or by modifying this start delay function.
In order to change 1-71, a separate LCP panel
needs used to change the settings on the drive,
the LCP panel has the ordering code 120Z0581.
When changing 1-71, a value not lower as 10
seconds should get applied.
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