Lubricants; Integration Into The Refrigeration Circuit; Mounting The Compressor; Lubricants 3 Lubricants 3 Lubricants 3 Lubricants 3 Lubricants - Emerson Copeland Screw SCH2 Applications Manual

• For circuits with with with with refrigerant injection for additional with
cooling and / or for greater system volumes:
Direct monitoring by means of an oil level monitor in
the oil separator(optional accessory) is recom-
mended.

3 Lubricants

3 Lubricants 3 Lubricants
3 Lubricants 3 Lubricants
Apart from the lubrication it is also the task of the oil to
provide dynamic sealing of the rotors. Special demands
result from this with regard to viscosity, solubility and
foaming characteristics. Copeland approved oils may
therefore be used only.
Important instructions Important instructions Important instructions Important instructions Important instructions
• Observe the application limits of the compressors.
• The lower limit value of the discharge gas tempera-
ture (140°F) is a reference value only. It must be
ensured by sufficient suction super-heat that the
discharge gas temperature is at least 54°F (R134a,
R404A / R507A mi. 36°F) above the condensing
temperature.
• Ester oils Solest170 (for HFC refrigerants) and
CP4214-320 (for R22) are very hygroscopic. Special
care is therefore required when dehydrating the
system and when handling open oil containers.
• A corrected design may be necessary for direct-
expansion evaporators with finned tubes on the
refrigerant side (consultation with manufacturer).
The above information corresponds to the present
status of our knowledge and is intended as a guide for
general applications. This information does not have
the purpose of confirming certain oil characteristics or
their suitability for a particular case.

4 Integration into the refrigeration circuit

4 Integration into the refrigeration circuit
4 Integration into the refrigeration circuit 4 Integration into the refrigeration circuit 4 Integration into the refrigeration circuit
Compact screw compressors are well suited for
integration in factory-assembled plants (liquid chillers
and air conditioning units). Their use in extended
systems is also possible, for example, with remotely
installed condenser.
Systems with multiple compressors should preferably
be designed with individual circuits. Parallel compound
is possible, but requires a special oil equalizing
system by means of oil level control.
© 2002 Copeland Corporation
Issued 4-2002
Printed in U.S.A.
Mounting and installation

4.1 Mounting the compressor

4.1 Mounting the compresso 4.1 Mounting the compresso 4.1 Mounting the compresso 4.1 Mounting the compresso
With stationary systems the compressor has to be
installed horizontally.
In case of marine application, mounting in direction of
the longitudinal axis of the boat may be required.
Detailed layout recommendation can be provided upon
request.
Anti-vibration mountings Anti-vibration mountings Anti-vibration mountings Anti-vibration mountings Anti-vibration mountings
Rigid mounting of the compressor is possible. The use
of anti-vibration mountings especially matched to the
compressors is recommended, however, to reduce the
transmission of body radiated noise.
With direct mounting on water cooled condensers:
Do not mount the compressor directly Do not mount the compressor directly Do not mount the compressor directly Do not mount the compressor directly Do not mount the compressor directly
on the condenser on the condenser
on the condenser on the condenser on the condenser. Do not use the
condenser structural mmember! condenser structural mmember! condenser structural mmember! condenser structural mmember! condenser structural mmember!
Damage of the condenser is possible Damage of the condenser is possible Damage of the condenser is possible
Damage of the condenser is possible Damage of the condenser is possible
(fatigue fractures). Use anti-vibration (fatigue fractures). Use anti-vibration (fatigue fractures). Use anti-vibration (fatigue fractures). Use anti-vibration (fatigue fractures). Use anti-vibration
The installation of the anti-vibration mountings is shown
in figure 5. The bolts should only be tightened until
slight deformation of the upper rubber disc is just
visible.
7
Figure 5
CAUTION! CAUTION! CAUTION! CAUTION! CAUTION!
. Do not use the . Do not use the
. Do not use the . Do not use the
mountings! mountings! mountings!
mountings! mountings!
AE4-1322