M0G140F7-01 06/11/07
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5
INSTRUCTIONS FOR THE USER
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This is a partial sintex of the information provided in the manual; carefully read this manual
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Carefully read this manual. Keep it with the electrical diagram. Make it available to technicians for servicing.
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Ask the installer for training on start-up, shutdown, changing set points, placing in at-rest status, maintenance, what to do
or not to do in the event of a breakdown.
•
Provide for scheduled maintenance by specialized technicians so as to ensure long-lasting operation of the unit.
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If you expect the machine to be shut down for long periods of time, disconnect the electrical power supply. In winter, take
necessary measures to deal with possible freezing (unit and system pipes) .
PRINCIPLE OF OPERATION
SUMMER: the cooling cycle allows the transfer of excess indoor heat to the
external environment.
1. The compressor compresses the refrigerant gas, placing it at high pressure
and high temperature.
2. In the external coil, the refrigerant is cooled, and the heat is released into the
environment by means of the fan. This is why the coil needs to be kept clean
and free of obstacles.
3. When it cools, the refrigerant becomes liquid.
4. The expansion valve causes a sudden drop in the pressure of the refrigerant,
which becomes very cold as its volume increases.
5. In the exchanger, the refrigerant evaporates and absorbs the heat from the
water that returns to the system, cooling it.
2
1a
3
4
5
6
1b
COMMON CAUSES OF SHUTDOWN
1. coils dirty - clogged by leaves - nearby obstacles
2. set point too low (in summer)
3. water in system is too hot (in summer, for example
with machine left off over the weekend) or too cold (in
winter)
4. water filter dirty
5. external
permissions
(remote ON-OFF etc. )
6. water cut-off valves closed
7. system not pressurized - air needs to be vented
8. system pump off
9. unit exchanger dirty
10. fans blocked by snow
