CLIVET CSRN-XHE2 Series, Manual

Page: 73 / 92

Operating range (Cooling)
Operating range (Heating)
The limits are meant as an indication and they have been calculated by considering:
- general and non specific sizes,
- standard airflow,
- non-critical positioning of the unit and correct operating and maintenance of the
unit,
- operating at full load
To verify the operation field of the operating units with percentages of outdoor air,
always calculate the Tm mixing temperature at the internal heat exchanger input.
Tm = internal exchanger entering air temperature
dry bulb measured temperature (D.B.=DRY BULB)
Text = inlet air temperature in the external exchanger
temperature measured with wet bulb (W.B.=WET BULB)
1. Operation range at full load
2. Range in which the unit operation is allowed only for a limited period (max 1
hour)
3. Operation range of the unit equipped with “application for low outdoor tempe-
rature” and “hot water coil” or “gas heating module” options. The heat pump
circuit is not active.
The limits are meant as an indication and they have been calculated by considering:
- general and non specific sizes,
- standard airflow,
- non-critical positioning of the unit and correct operating and maintenance of the unit,
- operating at full load.
To verify the operation field of the operating units with percentages of outdoor air,
always calculate the Tm mixing temperature at the internal heat exchanger input.
Tm = Internal exchanger entering air temperature
temperature measured with wet bulb (W.B.=WET BULB)
Text = Inlet air temperature in the external exchanger
dry bulb measured temperature (D.B.=DRY BULB)
1. Standard operating range
2. Operation range of the unit in FREE-COOLING mode or with automatic distribution
of the outdoor ventilation
WET BULB TEMPERATURE - EXAMPLE
In extended operating mode, in heat pump operation with an outdoor air temperature of less than 6°C, the unit performs defrosts by reversing the cycle, activating one circuit at a
time and maintaining the ventilation active to eliminate the ice that forms on the surfaces of the outside exchanger. In the event of negative temperatures, the water resulting from the
defrosts must be drained so as to avoid the accumulation of ice near the base of the unit. Make sure that this does not constitute a danger for people or things.
With an outdoor air temperature between –10°C and –30°C install the following options: hot water coil or gas heating module and outdoor air low temperature configuration.
General technical data
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