10/40 366430 / 04.2013_b
Installaon Instrucons |
Valve ghtening torques on the compressors and
receivers
WARNING
To maintain the quality of a TECUMSEH EUROPE condensing
unit and to ensure it funcons correctly, the following
precauons must be taken:
- Protect the casing whilst brazing pipework,
- Purge the system with nitrogen whilst brazing,
- Insulate the sucon line up to the compressor inlet with
an-condensaon pipe insulaon.
See Appendix 1, page 30 to 31 for the refrigeraon
connecons.
Make sure to insulate the sucon pipe work to limit the sucon
superheat. For low temperature applicaons, we advise using
a minimum of 19mm thick insulaon.
Tape the cables together with vinyl adhesive tape and clip
them to the wall. Be careful not to damage the insulaon of
the cables during the installaon. A cable tray which conforms
to NF C15- 100 and is separate from the refrigerant lines is
recommended.
General design principles for pipework
Sucon pipework returns refrigerant
gas to the compressor from the
evaporator. In pracce, the sucon
pipework should be designed to limit
the pressure drop.
- If the compressor is located
higher than the evaporator, sucon
risers must be used. Pipeline velocity
must be sucient to ensure oil ow
in the sucon risers.
- If the compressor is on the same
level or lower than the evaporator,
we recommend that swan neck
sucon line is used where the top of the swan neck is above
the evaporator.
An oil separator prior to start up prevents the return of liquid
refrigerant to the compressor during the o cycle.
Two non-return valves are ed on the condensing unit, one
upstream of the separator, one downstream.
Pressure drop in the pipework must be prevented. The
components ed to the liquid line such as the lter drier,
solenoid valve, liquid line sight glass can have a pressure drop
which is signicant.
The pressure drop per component should be checked to
ensure it is not excessive.
The design of rotary compressors makes any emptying or
relling of refrigerant charge impossible.
■ 3.8 Electrical connecons
WARNING
To ensure the quality of a TECUMSEH EUROPE condensing unit,
it is essenal to:
- Check that the installaon power supply voltage is compable
with that of the condensing unit (see idencaon plate).
- Check the compability of the wiring diagram with that of
the installaon.
- Size the cables (power and control circuits) according to the
specicaons of the condensing unit installed.
See table of current rangs in the Electrical Data
Instrucons
- Ensure that the power supply to the unit is correctly
protected and earthed.
- Ensure that all electrical connecons conform to the local
standards and follow recommended best pracce.
- 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 sasfactory at
a given me. All the compressors in the TECUMSEH EUROPE
range are protected by an external or internal protecon
mechanism, for which the principle is based on a current /
temperature combinaon. Like any protecon mechanism, it
is normal for it to disconnect the compressor’s power supply
outside the normal usage ranges provided by TECUMSEH
EUROPE.
■ 3.9.Connecng components
Please refer to the wiring diagram (refer to Silensys’ electrical
data instrucons
) when connecng components.
- Connect all control and safety devices ed to the unit.
- Secure wiring using the clips ed to the condensing unit.
- Close the electrical box aer wiring.
4- START UP
Our compressors are designed to operate at a maximum
ambient temperature of 46 °C. Do not exceed this temperature.
To opmize the quanty of refrigerant in the installaon,
respect the cooling rules of the art.
For the dierent condions of use of the compressor, do not
exceed its maximum service pressure (see idencaon 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, creang a vapour eect. Without a safety device,
the compressor will behave like a vapour generator and the
motor’s heang will generate a high increase in pressure.
The disintegraon 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 re. Regardless of the work being carried out on
the cooling system, simply posioning the electrical unit cover
correctly will protect against this type of risk.
Avoid very corrosive or dusty environments. If the installaon
is shut down for a lengthy period, you are strongly advised to
bring the cooling uid into the tank when the condenser unit
has one. The aim of this operaon is to avoid the refrigerant
migrang to the compressor and any concentraon of uid
within the lubricant that may cause liquid slugs during
recommissioning.
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