EVAPORATOR
EVAPORATOR
COMPRESSOR
10/40
366430 / 04.2013_b
Installation Instructions
|
Valve tightening torques on the compressors and
receivers
WARNING
To maintain the quality of a TECUMSEH EUROPE condensing
unit and to ensure it functions correctly, the following
precautions must be taken:
- Protect the casing whilst brazing pipework,
- Purge the system with nitrogen whilst brazing,
- Insulate the suction line up to the compressor inlet with
anti-condensation pipe insulation.
See Appendix 1, page 30 to 31 for the refrigeration
connections.
Make sure to insulate the suction pipe work to limit the suction
superheat. For low temperature applications, we advise using
a minimum of 19mm thick insulation.
Tape the cables together with vinyl adhesive tape and clip
them to the wall. Be careful not to damage the insulation of
the cables during the installation. A cable tray which conforms
to NF C15- 100 and is separate from the refrigerant lines is
recommended.
General design principles for pipework
Suction pipework
Suction pipework returns refrigerant
gas to the compressor from the
evaporator. In practice, the suction
pipework should be designed to limit
the pressure drop.
-
If the compressor is located
higher than the evaporator, suction
risers must be used. Pipeline velocity
must be sufficient to ensure oil flow
in the suction risers.
-
If the compressor is on the same
level or lower than the evaporator,
we recommend that swan neck
suction line is used where the top of the swan neck is above
the evaporator.
Discharge pipework
An oil separator prior to start up prevents the return of liquid
refrigerant to the compressor during the off cycle.
Two non-return valves are fitted on the condensing unit, one
upstream of the separator, one downstream.
Liquid pipework
Pressure drop in the pipework must be prevented. The
components fitted to the liquid line such as the filter drier,
solenoid valve, liquid line sight glass can have a pressure drop
which is significant.
The pressure drop per component should be checked to
ensure it is not excessive.
The design of rotary compressors makes any emptying or
refilling of refrigerant charge impossible.
■
3.8 Electrical connections
Ensure the electrical supply is disconnected before
carrying out any wiring or repairs of the unit.
All cabling on site must conform with NF C15- 100 in France
or to the current legislation in the country in question
(IEC 60204/IEC 60335).
According to IEC60335, the degree of pollution is 3.
WARNING
To ensure the quality of a TECUMSEH EUROPE condensing unit,
it is essential to:
- Check that the installation power supply voltage is compatible
with that of the condensing unit (see identification plate).
- Check the compatibility of the wiring diagram with that of
the installation.
- Size the cables (power and control circuits) according to the
specifications of the condensing unit installed.
See table of current ratings in the Electrical Data
Instructions
- Ensure that the power supply to the unit is correctly
protected and earthed.
- Ensure that all electrical connections conform to the local
standards and follow recommended best practice.
- Ensure that the unit is earthed when replacing components.
- It is recommended to add a phase controller on the power
supply of Scroll compressors.
Like the protector, it is vital to use the relay delivered with the
compressor, even if another model seems to be satisfactory at
a given time. All the compressors in the TECUMSEH EUROPE
range are protected by an external or internal protection
mechanism, for which the principle is based on a current /
temperature combination. Like any protection mechanism, it
is normal for it to disconnect the compressor’s power supply
outside the normal usage ranges provided by TECUMSEH
EUROPE.
■
3.9.Connecting components
Please refer to the wiring diagram (
refer to Silensys’ electrical
data instructions
) when connecting components.
- Connect all control and safety devices fitted to the unit.
- Secure wiring using the clips fitted to the condensing unit.
- Close the electrical box after wiring.
4- START UP
Our compressors are designed to operate at a maximum
ambient temperature of 46 °C. Do not exceed this temperature.
To optimize the quantity of refrigerant in the installation,
respect the cooling rules of the art.
For the different conditions of use of the compressor, do not
exceed its maximum service pressure (see identification label).
If there is a single-walled tube between the water and the
refrigerant (e.g.: water evaporator) and if a leak occurs through
this wall, the refrigerant leaks outside and water enters the
system, creating a vapour effect. Without a safety device,
the compressor will behave like a vapour generator and the
motor’s heating will generate a high increase in pressure.
The disintegration of the insulator (glass bead) on one of the
compressor’s electricity supply terminals following a physical
impact may create a hole through which the refrigerant and
some oil may escape. If it comes into contact with a spark, this
mix may catch fire. Regardless of the work being carried out on
the cooling system, simply positioning the electrical unit cover
correctly will protect against this type of risk.
Avoid very corrosive or dusty environments. If the installation
is shut down for a lengthy period, you are strongly advised to
bring the cooling fluid into the tank when the condenser unit
has one. The aim of this operation is to avoid the refrigerant
migrating to the compressor and any concentration of fluid
within the lubricant that may cause liquid slugs during
recommissioning.
Summary of Contents for SILENSYS
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