SPLIT-SYSTEM - Rhoss

SECTION II: INSTALLATION AND MAINTENANCE
II.2.6
ELECTRICAL CONNECTIONS
IMPORTANT!
The electrical connections must be made by
specialist personnel in compliance with laws and
regulations in force in the country of installation.
RHOSS shall not be held liable for damage to
persons or property caused by incorrect electrical
connection.
DANGER!
Always install an automatic main switch (IG) in a
protected area near the appliance with a
characteristic delayed curve, with sufficient
capacity and breaking power. There should be a
minimum distance of 3 mm between the contacts.
The automatic main switch (IG) must be placed up
the line from the entire system in order to cut off
the electrical power supply to the main unit and to
all the accessories connected to it which make up
the entire system.
Earth connection is compulsory by law to ensure
user safety while the machine is in use.
Strip off the sheathing only in the immediate area of the terminals. Use
suitable cable-ends for the terminals involved.
After inserting the cable-end into the terminal, tighten the screws with a
screwdriver without applying excessive force: at the end of the
operation, pull gently on the cables to check that they are properly tight.
Use the cable clamp inside the electronic board compartment to lock
the cables.
II.2.6.1
Connecting the power supply
Check that the voltage and the frequency of the electrical supply
correspond to 230V (±10%) single phase at 50 Hz; that the available
power is sufficient for the running the equipment; and that the supply
cables are of adequate section for the maximum current which will be
required.
Make sure that the electrical supply system complies with current
national safety regulations.
When connecting the unit to the electricity network, use flexible bipolar
wiring + earth, 1.5 mm² section with polychloroprene sheath of no
lighter than H05RN-F. The earth conductor must be longer than the
other conductors in order to ensure that in the event of the cable
clamping device becoming slack, it will be the last to come under strain.
The electrical connection wires must be made to pass through conduits
with a sufficient level of protection, which must be firmly secured to the
floor or the walls.
Special attention must be given to any sharp edges, burrs, rough
surfaces in general or threads so as to guarantee that the conductor
insulation is not damaged.
When making connections, removing the internal unit casing and the
external unit side door (refrigerant connections side), insert the electric
wires into the terminals in keeping with the wiring diagrams applied on
the
air conditioning units themselves.
In the event that the unit is mounted on a metal surface, earth
connections must be made in compliance with local regulations.
The connections must be made in compliance with the wiring diagrams
in the enclosed documents.
The electrical line is normally around 2 m longer than the refrigerant
line.
Each internal unit is fitted with a power supply cable with plug.
II.3
START-UP INSTRUCTIONS
IMPORTANT!
Machine commissioning or the first start up (where
required) must be carried out by skilled personnel
qualified to work on this type of product.
DANGER!
Before starting up, make sure that the installation
and electrical connections have been carried out in
accordance with the instructions in this manual.
Also make sure that there are no unauthorised
persons in the vicinity of the machine during the
above operations.
4. the electrical connections are correct;
5. the screws holding the cables are well tightened;
6. the supply voltage is as required;
It is advisable to run the unit at maximum speed for several hours.
II.4
II.4.1
EXTRAORDINARY MAINTENANCE
DANGER!
Maintenance work must only be carried out by
qualified technicians authorised to work on airconditioning
and refrigerant systems.
Use suitable work gloves.
DANGER!
Always turn off the automatic main switch (IG) for
the protection of the entire system before doing any
maintenance work, even if it is only an inspection.
Make sure that no one accidentally supplies power
to the machine – lock the automatic main switch in
the off position.
DANGER!
Beware of the hot surfaces inside the machine.
Do not introduce pointed objects through the air
delivery intake grilles.
REFRIGERANT FLUID CHARGE CONTROL
Fit a pressure gauge on the test point on the outlet side and another on
the test point on the suction side. Start up the unit and check both
pressure readings once the pressure has stabilised.
II.4.2
CHECKING FOR ABSENCE OF
REFRIGERANT FLUID LEAKS
Use a specific leak detector or soapy water to check the refrigerant
circuit and make sure that leaks do not exceed 5 g/year.
II.4.3
CHECKING HEAT EXCHANGER
CLEANLINESS
Switch off the unit, check the heat exchanger and, depending on its
condition, proceed as follows:
• remove any foreign bodies from the finned surface which may
obstruct air flow;
• clean off the dust with a jet of compressed air;
• wash and brush, gently, with water;
• dry with a jet of compressed air;
II.4.4
CHECKING CONDENSATION DRAIN
CLEANLINESS
With the unit switched off, check the cleanliness of the condensation
drain tube.
II.4.5
CHECKING THE ELECTRIC CIRCUIT
The following checks are recommended on the electrical circuit:
• check the unit power absorption using a clip-on meter and compare
the reading with the values shown in Appendix A1;
• inspect and, if necessary, tighten the electrical contacts and
terminals.
II.4.6
COMPONENT REPLACEMENT
INSTRUCTIONS
Before replacing components, discharge coolant from both the high and
low-pressure sides. If the coolant is discharged from the high-pressure
side only, the compressor may close the circuit thereby preventing
pressure equalisation. In this way, the low-pressure side of the casing
and the suction line may remain pressurised. If that happens, if you
apply a brazing torch to one of the low-pressure components of the
system, the pressurised mixture of refrigerant and oil could blow out of
the circuit and ignite on contact with the brazing torch. To avoid this
hazard, make sure both the high and low pressure sides of the circuit
have been correctly depressurised before applying brazing torches.
Any topping up of the system on units with R410A refrigerant must be
carried out in the liquid phase, piping it from a cylinder so as not to alter
its composition.
II.3.1
CONTROLS BEFORE START-UP
Before starting up the unit, make sure that:
1. the unit is positioned correctly;
2. the system flow, return and condensation drainage pipes are
correctly connected;
3. the exchanger is clean;
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