Riello 20120391, Instructions For The Installer And For The Technical Support Service

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110
GENERAL INFORMATION
Minimum Maximum
Water heat exchanger
Entering water temperature (at start-up) 7.5
(1)
30 °C
Leaving water temperature (in operation) 5
(2)
20 °C
Inlet/outlet temperature difference 3
(2)
10 °C
Air-cooled standard exchanger
Inlet air temperature with full load 0 48 °C
Inlet air temperature with partial load 0 48 °C
Air-cooled exchanger. Winter operation or Xtra Fan (3) option
Inlet air temperature with full load -20 46 °C
Inlet air temperature with partial load -20 48 °C
Hydronic module (4) - Inlet air temperature
Without pump 0 - °C
With Single or Double (LP or HP) pump option 0 - °C
With Backup Tank option 0 - °C
Note: Do not exceed maximum operating temperature.
(1) For entering water temperature at start-up lower than 7.5°C contact the manufacturer.
(2) If leaving water temperature is lower than 5°C the use of the anti-freeze is mandatory.
(3) Channelled machines (Xtra Fan option). This operating range applies for up to 130 Pa static pressure for NXH 072 - NXH 084 and NXH
142 - NXH 164 sizes, and up to 240 Pa for all other sizes.
(4) It defines the anti-freeze protection temperature of the hydronic components for use without glycol. In case of storage and trans-
port of NXH units, the min. and max. temperature limits are -20°C and +48°C. It is recommended to take these temperature values
into account in case of transport in containers.
NXH models - Cooling mode
0
5
10
15
20
25
30
35
40
45
50
0 5 10 15 20 25
Full load Minimum load
0
5
10
15
20
25
30
35
40
45
50
0 5 10 15 20 25
Ambient air temperature (°C) Ambient air temperature (°C)
Evaporator leaving water temperature (°C) Evaporator leaving water temperature (°C)
NXH with silenced plus option NXH silenced version