5
Mechanical Specifications
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Liebert HPC---S 006---022---PD---273571---01.03.2012
Mechanical Specifications
Construction and Panels
The
Liebert HPC-S 006---022
series is designed for outdoor installations, having maximum corrosion
protection, with all panels being of heavy gauge, galvanised steel construction, polyester-powder
painted in RAL7032.
The base is of 2 mm gauge galvanised steel channels, polyester-powder painted in RAL7032, intercon-
nected using special rivets with elevated mechanical characteristics.
The inner hidden frame parts are constructed of galvanised steel.
Suitable fastening points are seated in the base, where the standardized hooks (UNI 1947) can be fitted
for lifting of the unit.
Panels are made of suitable gauge galvanised steel, polyester-powder painted in RAL7032 and provided
with waterproof gaskets.
Lateral and rear panels are fixed with screws, panels on the front and the access door for the electrical
board are fixed with triangular insert locks (a suitable key is supplied).
All screws and rivets are galvanized.
The access to the hydraulic components is ensured by opening the rear panels.
The compressor is located in a closed compartment, protected against outer agents, and insulated from
the airflow to avoid noise transmission and heat dissipation to the air stream.
The compressor compartment cooling is ensured by a grill on the front closing panel.
The compressors are mounted on anti-vibration mounts to prevent vibration transmission to the struc-
ture; in the low noise and quiet versions, the compressors feature a shroud made up of sound-insulating
and sound-absorbing materials.
Refrigeration Circuit
All models are equipped with one refrigerant circuit in which two compressors are fitted, in tandem con-
figuration.
It includes one safety pressure switch for Mod. 006-009 and two pressure switches for Mod. 011-022 for
high pressure, and one low pressure safety switch for only B version, TXV and solenoid valve for Bversion
and EEV for G version, filter-dryer with anti-acid solid cartridge, moisture indicating sight glass, ”HP”
safety valves, charge connections 5/16” SAE - Flare, liquid line, manual shut-off valve; ”HP” and ”LP”
pressure gauges.
The units are supplied charged with refrigerant R410A and oil set in the factory according to the operating
conditions within the indicated limits.
Refrigerant
The units are designed for being used with refrigerant R410A.
Compressor
The
Liebert HPC---S 006---022
series is equipped with two hermetic, scroll compressors specifically de-
signed for application in refrigeration systems.
Tandem compressors consist of two compressors which can be equal or different size models; they offer
advantages over single compressors with equivalent capacity such as:
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Efficient capacity control - through cycling one or two compressors.
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Increased reliability – fewer starts/stops than a single larger compressor.
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Redundancy – part load capacity if one compressor fails, reduced replacement costs.
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Superior performances on seasonal efficiency (ESEER) and consequently lower running costs.
Compressors used in tandem are solid mounted by use of steel spacers on two rigid rails to build a unit
in order to keep stresses in the tubing connecting the compressors at reasonable levels; compressors
are mounted as close as possible to each other so as to keep the gas-oil equalization line as short as
possible. The rails are bolted to the chiller basement through anti-vibration mounts. Connection for both
oil and gas equalization is made via sight glass of each compressor even when compressors have differ-
ent capacity; the so called Two-Phase Tube Line (TPTL) for oil and gas equalization balances the pres-
sures between the shells and so maintains the same oil level in each compressor. This configuration is
equipped and fitted with an oil sight glass in the equalization (TPTL) line.
Summary of Contents for HPC-S 006
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