Riello NXC 021 - Cooling Circuit and Probe Positioning

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General information
EN
1.11 RESIDUAL HEAD
Available static pressure, kPa
Water flow rate, I/s
0.0 0.5 1.0 1.5 2.0
2.5
300
240
250
260
270
280
290
170
180
190
200
210
220
230
110
120
130
140
150
160
50
60
70
80
90
100
6
1
2
3
5
4
Findbelowtheresidualheadcurvesofthepumps,forNXC/NXHunits
Legend:
1. NXC 017
2. NXC 021
3. NXC 026
4. NXC 033-NXH 026
5. NXH 033
6. NXC 040-NXH 040
1.12 COOLING CIRCUIT AND PROBE POSITIONING
For NXH series units, the cooling circuit is of the heat pump
typewitharefrigerantgasreversalcycle.Thesourceuiduti-
lizedistheexternalair,whiletheutilityuidiswater,with
thepossibleinclusionofanti-freezeliquid.Duringthewin-
tertime,theheatpumpextractsthethermalenergyfromthe
externalairanddeliversittotheutilityuid,therebyhea-
tingit.Duringthesummertimethecycleisreversed,andthe
thermalenergyisextractedfromthewater,whichiscooled,
andisdeliveredtotheexternalair.Basedonthetypeofsy-
stem, the utility uid is delivered to the fan coils, the air
treatmentunit,theradiantpanelsforheatingorcoolingthe
rooms,ortheboilerinordertoproducedomestichotwater.
Ontheotherside,NXCseriesunitsdonothavethecyclere-
versal on the refrigerant gas.