Airwell PAC BTE UI 4 Manuel D'utilisation page 97

11 - GENERAL INSTRUCTIONS
An air bleed valve is installed in all of the highest points of the
system allowing the venting of the circuits air.
Drainage taps are installed in the lowest points of the system
to allow bleeding.
An expansion tank allows the correct system pressure to be
maintained when the water temperature varies. It must be
dimensioned as a function of water content. Under particular
circumstances it could be necessary install an additional one
or two tanks even if the unit is already supplied with a tank.
A water flow switch is obligatory if it is not present in the unit .
Filter is supplied with the unit; it must be installed on the
return ducting of the system close to the unit
The filter should never be re-moved, this operation
invalidates the warranty .
The hydraulic pipes weight mustn't burden on the unit
.
connections
Operation sequence
Before connecting the unit, carefully wash the system by filling
it and emptying it several times with clean water.
Ignoring this operation will lead to several filter cleaning
interventions and at worst cases can cause damages to the
exchangers and the other parts.
Execute leakage test before isolate the pipes.
To avoid heat dispersions and formation of condensate isolate
all the pipes.
Leave various point of service free (wells, vent-holes etc )
Water quality
The water quality is determined by the following factors, avoid
therefore:
- Inorganic salts
- pH
- Biological load (seaweeds etc)
- Suspended solids
- Dissolved oxygen
Water with inadequate characteristics can cause:
- pressure drop increase
- energy efficiency decrease
- corrosive symptom increase
Risk of freeze
If the unit or the relative water connections can be subject to
temperatures close to 0°C adopt measures for prevent risk of
freeze.
For example:
- Mix water with ethylene glycol
- Safeguard the pipes with heating cables placed under
the insulation
- Empty the system in cases of long non-use and check
that: :
- there are no closed taps present that could trap
water even after emptying
- there are no low points in which water can
stagnate even after emptying; carry out any
blowing required
Anti-freeze solution
Consider that the use of anti-freeze solution determines an
increase in a pressure drop.
Make sure that the glycol type utilized is inhibited (not
corrosive) and compatible with the hydraulic circuit
components (pump etc).
11.4 - ELETTRIC SYSTEM
This unit is required reliable earthing
before usage, otherwise might cause
death or injury.
General
The characteristics of the electrical lines must be determined
by specialized personnel able to design electrical installations;
moreover, the lines must be in conformity with regulations in
force. Please refer to the "Information" section for the detailed
characteristics of the unit (dimensioning, performance, etc) .
Operate in compliance with safety regulations in force .
This unit is required reliable earthing before usage, otherwise
might cause death or injury.
If you can't make sure that your house power supply is
earthed well, please don't install the unit if it does not in
conformity with regulations in force.
Power supply circuit should be earthed effectively.
Do not use water pipes to earthing connection of the unit
Use single protection devices : gloves, glasses ecc.
The protection devices of the unit power line must be able to
stop the presumed short circuit current, whose value must be
determined in function of system features. The power cables
and the protection cable section must be defined in
accordance with the characteristics of the protections
adopted. The serial number label reports the unit specific
electrical data, included any electrical accessories.
The electrical data indicated in the technical bulletin and in the
manual refer to the standard unit, accessories excluded.
Refer to those data.
Connection
All electrical operations should be performed by trained
personnel having the necessary requirements by the
regulations in force and being informed about the risks
relevant to these activities.
Refer to the unit electrical diagram (the number of the diagram
is shown on the serial number label).
Verify that the network has characteristics conforming to the
data shown on the serial number label .
Make sure that the unit supply line is selected at start.
Shelter the cables using adequate measure fairleads.
Before starting work, verify that the sectioning device at the
start of the unit power line is open, blocked and equipped with
sign warning.
First create the earthing connection
After wire connection, check it again and make sure the
correctness before power on.
Prior to powering the unit ensure that all the protections that
were removed during the electrical connection work have
been restored.
Signal lines/data-lay
Do not overpass the maximum power allowed, which varies,
according to the type of signal.
Lay the cables far from power cables or cables having a
.
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