Electrical Connections; Connecting Components; Start Up; Preventing Leakage - Tecumseh silensys Montageanleitung

■

3.8. Electrical connections

Ensure the electrical supply is disconnected
before carrying out any wiring or repairs of the
unit.
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 Appendix 7, pages 34 to 35.
- 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.
■

3.9.Connecting components

Please refer to the wiring diagram (refer to Silensys'electrical
data) when connecting components.
For small ans medium models when wall mounted, we
recommend connecting the supply cable to the isolator before
mounting the unit on the wall.
• 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

■

4.1. Preventing leakage

All connections must be systematically checked for any
leakage with an electronic leakage detector suitable for the
type of refrigerant used. A leak test can be carried out before
pulling a vacuum by using a pre-charge of nitrogen and a leak
detection aerosol (refrigerant tracers not approved) around
the joints. Do not over pressurize the system when using
nitrogen. A more accurate check using an electronic leakage
detector can be carried out after charging with refrigerant.
■
4.2. Pulling a vacuum
Pull a deep vacuum on the installation to about 200 microns
mercury with a suitable vacuum pump.
We recommend that a vacuum is pulled simultaneously from
both high and low pressure sides of the system to ensure a
uniform vacuum throughout the system including the
compressor, and to reduce the amount of time required to
obtain the vacuum.
■

4.3. Refrigerant charge

Charge the installation using only the refrigerant for which the
unit has been designed (see identification plate).
Charging with refrigerant should always take place in the liquid
phase in order to maintain the correct blend of
zeotropic refrigerants. Only liquid charge into the liquid line.
8/36 366364b / 09.2007
Installation Instructions |
NEVER START THE COMPRESSOR UNDER VACUUM,
WHETHER HBP OR LBP and ensure before starting that the
compressor casing is under positive pressure. We therefore
recommend slowly charging the system to 4 or 5 bar when
using R-404A, and approximately 2 bar when using R-134a.
The remaining refrigerant can then be slowly charged into the
suction line when the compressor is running, until the nominal
operating conditions of the installation are reached. Complete
the "Pre-start check list" below before switching on the
installation.

Pre-start check list

Make sure that:
1. The power supply voltage is compatible with that of the
condensing unit.
2. Electrical safety devices are set correctly for the
condensing unit.
3. Service valves are fully open.
4. The crankcase heater is working.
5. Condensing unit fan blades rotate freely.
6. The installation is given a final check for any possible faults.

Check list after start up

After the installation has been running for several hours, carry
out the following checks. Make sure that:
1. The voltage and current drawn by the condensing unit is correct.
2. The high and low operating pressures of the installation
are correct.
3. Fan blades are rotating freely.
4. 4. Superheat and sub cooling
5. The system is checked again for leaks.
Make sure that the installation is running smoothly.
Carry out a general inspection of the installation (e.g.
cleanliness, vibration and/or unusual noises). Ensure the
settings and the function of the electrical circuits are correct.
■
4.4. Fan speed control
The rotational speed of the fan(s) is controlled by a pressure
actuated fan speed control. Its function is to:
- Prevent an excessive drop in condensing pressure in winter
which would adversely affect the correct operation of the
expansion valve,
- Further reduce noise levels when the ambient temperature allows.
See Appendix 5, page 33 on fan speed control

5- SERVICING AND MAINTENANCE

In order to maintain the low noise levels of the condensing
unit over time, we recommend replacing the anti-vibration
mounts and/or isolating pads as soon as any change in the
noise or vibration level of the unit is noticed.
Access to the connections, fan and compressor compartments
can be gained from either the side door panel or the front of
the unit, without removing the lid.
■

5.1. Condenser

The condenser and the condensing unit should be cleaned at
least once a year. Access from the inside of the unit can be
gained by removing the fan cover.