Operation; Unit Range - Nxhp; Operating Modes - Riello NXHP Series Installation, Operation And Maintenance Instructions

4 - OPERATION

4.1 - Unit range - NXHP

Cooling Cycle
Evaporator Water Temperature
Entering water temperature at start-up
Leaving water temperature during operation
Condenser Air Temperature
Standard unit
Heating Cycle
Condenser Water Temperature
Entering water temperature at start-up
Leaving water temperature during operation
Evaporator Air Temperature
Standard unit
(1) For operation at outdoor ambient temperature below 0°C (heating mode), the
water freeze protection should be available and according to the water installation,
the water loop can be protected against freeze by the installer, using an anti-
freeze solution or trace heater.

4.2 - Operating modes

4.2.1 - Occupancy mode
Depending on unit configuration, the system can be controlled in
two ways. The first possible method embraces the use of setpoints,
where the outdoor air temperature has no effect on the temperature
set by the control. The second control method is based on a
climatic curve. In this case, the water temperature is adjusted in
response to changes in the external temperature.
The unit may operate in HOME, SLEEP, or AWAY mode. The
occupancy can be set manually by the user or automatically
according to the schedule (refer to WUI end user manual or
Ocuppancy schedule parameters (P670 to P696, see § 7.1).
°C
Minimum Maximum
7 30
4 20
°C
Minimum Maximum
10 46
°C
Minimum Maximum
15 70
20 75
°C
Minimum Maximum
-20 40
(1)
Operating range - Cooling mode
50
45
40
35
30
25
20
15
10
5
3 4 5 6 7 8 9
Leaving water temperature (°C)
Operating range - Heating mode
45
35
25
15
5
-5
-15
-25
15 20 25 30 35
Leaving water temperature (°C)
Occupancy WUI Display
Home
Sleep
Away
CAUTION: In case of power cycle, the previous operating
mode (cooling / heating / DHW) or occupancy mode (home /
sleep / away) will be automatically restored.
10 11 12 13 14 15 16 17 18 19 20 21
NXHP
40 45 50 55 60 65 70 75
NXHP
Comfort Type
Comfort
Comfort
Eco
80
47