Checking For Leaks; Instructions For Correct Connection - CLIVET MSAN 81 Anleitung Zur Installation, Bedienung Und Wartung

CHECKING FOR LEAKS

- Carefully check that the valves on the condensing units are closed.
- Connect the pressure gauge assembly to the service test points on the valves.
- Pressurise with refrigerant to 250KPa.
- Close the valves on the pressure gauge assembly, then disconnect the refrigerant
bottle and subsequently connect the nitrogen bottle.
- Open the valves on the pressure gauge.
- Pressurise the system with nitrogen to 1200KPa.
- Carefully check all the pipes using a leak detector or other electronic instrument, with
special attention to the welds and joints in general.
If the necessary equipment is not available, make sure any parts that may give rise
to refrigerant leaks (welds, joints etc.) are accessible.
O U T D O O R U N IT
G as v alv e
Liquid v alv e

INSTRUCTIONS FOR CORRECT CONNECTION

INLET/OUTLET PIPES
- Carefully insulate the pipe with anti-condensate, closed cell polyethylene, minimum
thickness 9mm.
- If the condensing unit is lower than the evaporating unit (see figure 4), install a drain
trap of equal height to the exchanger coil, so as to prevent the return of liquid to the
compressor when the unit is off.
- If the terminal unit is fitted with a thermostat as well as a drain trap, install a socket
(see Figure 4) as near as possible to the unit. This will prevent the bulb of the
thermostat from remaining in contact with the liquid when the unit is off (see Figure 4).
In the case of connection to our CED-V, CN-V terminal units, the drain trap is
already fitted inside the unit.
- If the condensing unit is higher than the evaporating unit, only install the socket (see
Fig. 6).
- For vertical rises, as well as well the socket also fit an oil collection trap every 6
metres (see Figure 7).
- Use wide-radius curves (no elbows).
- Carefully avoid choking the pipes.
LIQUID PIPES
- The piping is two directional depending if the unit operates in the cooling or heating
function. Because of this it is essential that the cut-off valves are selected
accordingly.
- If exposed to the sun or passing through areas where the temperature is higher than
the outside temperature, they must insulated, otherwise they can be free.
- Avoid excessive diameters so as to prevent an excess refrigerant charge.
.
When the inside terminal unit is fitted with a thermostatic valve and the connection pipes are longer than 15-20 metres or its is
planned to use the system in changing climatic conditions (e.g. ambient air differs greatly between day and night / summer and
winter) it is best to fit a liquid expansion device with a suitable capacity near the inside unit. (1)
The liquid receiver performs the following functions:
- It prevents gaseous freon form reaching the expansion device.
- It compensates for the variations in charge that occur in the system due to the change in operating conditions.
- For a certain time it partly compensates for any immeasurable microscopic leaks that occur in the system over time.
- It prevents the excessive flooding of the condenser with the corresponding raising of the condensing temperature/pressure if
the system has been charged with a higher quantity of refrigerant, or if the system was charged in abnormal climatic conditions.
Having said this, the liquid receiver should always be installed when the connections are very long.
1) Because the liquid flow is two directional it is essential that the inlet and outlet are fitted at the lowest point.
IN D O O R U N IT
IMPORTANT
62
THERMOSTAT
THERMOSTAT
BULB
BULB
Figure 4
Figure 6
Figure 7