10
Liebert
®
PDX, EconoPhase Version - UM - 265133 - 29.08.2019
1.9 - Operating limits
The units are designed to operate within working ranges (see Tab. 3).
These limits are referred to new machines or to those that have
been correctly installed and serviced.
The warranty clauses are no longer valid for any possible damage
or malfunction that may occur during or due to operation outside
the application values.
Tab. 3 - Operating limits
Note:
The allowed thermal load shall not be lower than 20% of nominal
air conditioner cooling capacity. Lower thermal load will drive
to imprecise temperature and humidity control and frequent
compressor(s) switch on/o.
Note:
The minimum condensing temperature for PX150-165 is 40 °C.
Outdoor temperature: lower limit
Exceeding the winter low temperature limits could
drive to issues at the microprocessor control, at the
electric devices and at the fan operation. Normally with
these low temperatures the compressor is stopped
and the EconoPhase is active. In case of compressor
running, exceeding these temperatures could stop the
compressor(s) by Low Pressure transducer. Reset to
normal operation can only be carried out manually through
the unit control.
down to - 35° C
Room air conditions
Temperature: From 20°C to 35° C
Humidity ratio
From 5.5 g/kg to
12 g/kg
Relative humidity From 20% to 60%
Room air conditions
PX150 - PX165
Temperature: From 26°C to 40° C
Humidity ratio
From 5.5 g/kg to
12 g/kg
Relative humidity From 20% to 60%
Storage conditions
Temperature: From -20°C to 50° C
Relative humidity
Max. 90% RH,
preventing surface
condensation.
Power supply tolerances
V ± 10%
Hz ± 2
Relative position room unit vs. remote condenser
From unit to condenser, max
distance
up to 60 m
equivalent
length
up to 100 m
equivalent
length
Max geodetic height between
condenser and room unit. The
condenser located below the
room unit is not allowed.
from 0 m to
18 m
from 0 m to
18 m
Requirements
Pipe diameter see Tab. 6 see Tab. 6
Oil traps on vertical line of gas
refrigerant
every 6 m,
max
every 6 m,
max
Extra oil charge
see Tab.
7(Enc. B)
see Tab.
7(Enc. B)
Remote condenser fan speed
control (VARIEX) installation
mandatory mandatory
Condenser design
oversized
+20%
Hot Gas Reheat not allowed not allowed
Insulation external liquid pipe
line
mandatory mandatory
Remote condenser Vertiv fan speed control (VARIEX) required.
It is standard available on the MC Condenser EconoPhase
version
Outdoor temperature: higher limit
This limit is determined by coupled condenser model.
Exceeding this limit (or a lack of maintenance), the
compressor(s) could stop by High Pressure switch. Reset to
normal operation can only be carried out manually.
Approved Remote Air Condenser
To ensure safe and correct operation, best performance,
and longest life the units must be connected only to remote
condensers approved by Vertiv.
The warranty clauses are no longer valid if the unit is connected
to an unapproved remote condenser.
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