Riello 20161608, Installation And Technical Service Instructions

Page: 17 / 68

17
INStAllAtION
to a place suitable for drainage.
1 Condensate drain connection
1
• In case of free runoff:
— before placing the unit
— open the pre-cuts prepared on the base
9
The condensation settles on the support surface. In case of
sub-zero temperatures it can freeze and constitute a dan-
ger: provide suitable barriers to prevent people from ap-
proaching the unit.
• In case of conveyed discharge:
— insert a condensate drain fitting
— connect a drain hose
— direct to a place suitable for drainage
2.8 Installation on old systems or systems in need
of upgrading
When
R
NXH is installed on old systems or systems in need of
upgrading, it is recommended to ensure that:
— the electrical system is compliant with the applicable reg-
ulations and has been installed by qualified professionals
— the expansion tank ensures total absorption of the expan-
sion of the fluid contained in the system
— the system is washed, cleaned of sludge, scale, deaerated
and the seals have been checked
— a treatment system is provided when the feed / make-up
water is particular (see chapter"Water quality characteris-
tics"
p. 21)
9
In the event of a replacement, the system must be inspected
by the designer or by another competent person, and must
be compliant with the technical requirements, as well as
the current legislations and regulations.
9
The manufacturer is not responsible for any damage caused
by incorrect installation of the systems and failure to clean
the hydraulic system.
2.9 Hydraulic schemes
Heat pumps require systems that guarantee a constant flow of
fluid to the appliance, within minimum and maximum values
and with sufficient volumes to avoid disturbances to the refrig-
erant circuits and to guarantee the correct degree of comfort.
0
IT IS FORbIDDEN to install the appliance in open vessel sys-
tems.
2.9.1 Plant water content
For correct operation of the appliance, a minimum volume of
water must be guaranteed in the primary circuit of the system.
9
The minimum volume is necessary to prevent the risk of ice
formation during defrosting operations or the continuous
modulation of the compressor frequency.
It also allows the following advantages:
— less wear on the appliance
— increase in system efficiency
— migliore stabilità e precisione della temperatura
• Il volume minimo è calcolato in base alla seguente formula:
• Vmin = Cnom x N
Vmin better temperature stability and precision
Cnom Nominal cooling capacity under the conditions envis-
aged for the system in kW
N Multiplication factor
Application N
Cooling 3,5
Heating or domestic hot water 6
If the minimum volume is not reached, a suitably sized storage
tank must be provided.
2.9.2 Water flow
The water flow rate must be kept constant during operation and
must comply with the limits shown in the table:
Model 005 007 011 015 011t 015t
Hydraulic characteristics
Minimum water
flow
m³/h 0,2 0,4 0,6 0,6 0,6 0,6
Nominal water flow m³/h 0,9 1,2 1,9 2,6 1,9 2,6
Maximum water
flow
m³/h 4,3 4,3 7,0 7,0 7,0 7,0