Water Flow Rate Control - Riello NXHP Series Installation, Operation And Maintenance Instructions

2 - INSTALLATION OF UNIT
Condensate drain pan heater (Accessory)
When accessory base panel and condensate drain heater is installed, the cable must be routed inside the vertical cable trunking and
through the dedicated grommet, as shown hereafter.
For wiring details, refer to the electrical drawing.
2.4.4 - Recommended customer electrical protection
Electrical protection is the responsibility of the installer, and depends on the characteristics and regulations applicable to each installation
site. The following is only to be used as a guideline, and does not make manufacturer in any way liable.
NXHP
Circuit breaker:
Type
Current A
Fuses:
Type
Current A
Electrical data and operating conditions notes:
• NXHP units have a single power connection point located immediately upstream
of the field power connections.
• The control box includes the following standard features:
- Variable frequency drive for compressor, fans and pump (option)
- The control devices.
• Field connections:
All connections to the system and the electrical installations must be in full accordance
with all applicable local codes.
NOTES:
• The operating environment for the NXHP units is specified below:
1. Physical environment (2) . The classification of environment is specified:
- outdoor installation: protection level IP44
- operating temperature range: -20°C to +46°C
- storage temperature range: -20°C to +48°C
- altitude: ≤ 2000 m (see note for table 1.5.4 - Electrical data, hydraulic module)
- presence of hard solids, class AE3 (no significant dust present)
- presence of corrosive and polluting substances, class AF1 (negligible)

2.5 - Water flow rate control

2.5.1 - Water leakage
Check that the water-side connections are clean and show no
sign of leakage.
2.5.2 - Minimum water flow rate
If the installation flow rate is below the minimum flow rate, there
is a risk of excessive fouling.
2.5.3 - Maximum water flow rate
This is limited by the permitted water heat exchanger pressure
drop.
Base panel heater (cable routing)
004 006 008
(1Ph) (1Ph) (1Ph)
C C
16 20 25
gG gG gG
20 25 32
(2)
010 012
(1Ph) (1Ph)
C C C
32 32
gG gG
40 40
2. Power supply frequency variation: ± 2 %.
3. The neutral (N) conductor must be always connected to the unit
4. Overcurrent protection of the power supply conductors is not provided with
the unit.
5. The units are designed for simplified connection on TT networks.
Caution: If particular aspects of an actual installation do not conform to the
conditions described above, or if there are other conditions which should be
considered, always contact your local representative.
(1) The absence of main power disconnect switch is an exception that must be
taken into account at field installation level.
(2) The required protection level for this class is IP43BW. All NXHP units fulfil
this protection condition:
- Closed electrical box is IP44
- W hen accessing to interface, the level is IPxxB
2.5.4 - Water heat exchanger flow rate
Data applicable for:
■ Fresh water 20°C
■ In case of use of the glycol, the maximum water flow is reduced.
NXHP units with hydraulic module
Minimum water
flow rate
m
004 0,25
006 0,42
008 0,42
010 0,42
012
014
(1) Eurovent heating conditions
014 012
(1Ph) (3Ph)
C C
32 20
gG gG
40 25
Nominal water
flow rate (1)
/h m /h
3 3
0,7
1,0
1,3
1,7
0,6 2,0
0,6 2,2
014
(3Ph)
C
20
gG
25
Maximum water
flow rate
m /h
3
2,7
4,3
4,3
4,3
6,3
6,3
29