Riello 20120391, Инструкции для установщика и технической поддержки

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162
MAINTENANCE
INSTALLATION
6.3 Water heat exchanger maintenance
Check that:
− the insulating foam is intact and remains firmly in po-
sition.
− The BPHEs and the electric pipe heaters are functioning
properly and are correctly positioned in a secure man-
ner.
− The connections on the water side are clean and do not
show any signs of leaks.
6.4 Unit maintenance
9
Prior to performing any intervention upon the unit, make
sure that the circuit has been isolated and that no electri-
cal voltage is present. It should be noted that the circuit's
condensers could take up to 5 minutes to completely dis-
charge after the circuit has been isolated. Work upon the
VFD must only be carried out by qualified personnel.
In the event of an alarm or a persistent problem relating to the
VFD, contact the Technical Service.
VFDs equipped of units do not require an insulation, even
if they are replaced; in fact, they are systematically inspected
prior to delivery. Furthermore, the filtering components in-
stalled in the VFD can distort the measurements and can also
be damaged. If the isolation of the device's components (fan
and pump motors, cables, etc.) needs to be verified, the VFD
must be disconnected from the power circuit.
6.5 Refrigerant volume
The unit must be activated in cooling mode in order to deter-
mine whether the unit charge is correct, by checking the actual
subcooling.
A small refrigerant leak with respect to the initial charge will be
evident in cooling mode, and will affect the subcooling value
obtained at the output of the air heat exchanger (capacitor),
but will not be visible in heating mode.
9
It is therefore not possible to optimise the refrigerant
charge in heating mode following a leak. The unit must be
activated in cooling mode in order to determine whether
an additional charge is required.
6.6 Tightening torques for the fastening
elements
Screw type Use
Tightening
torque
Compressor
support
CP spacer 30
M8 nut BPHE assembly
(1)
15
M10 nut Compressor stud bolt 30
M16 nut Compressor assembly 30
Oil nut Oil levelling line 75
M6 Taptite
screw
Ventilation support 7
M8 Taptite
screw
Ventilation motor assembly 13
H M8 screw Blade assembly 18
Panel screw Metal panels 4.2
H M6 screw Stauff clamp 10
Earth screw Compressor 2.8
H M6 screw Stauff clamp 10
Earth screw Compressor 2.8
(1) BPHE: Brazed plate heat exchanger.