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Supply setpoint calculation
SMGB0066 rev.0 - 12/2009
Controller pack
Service Manual
4
Bi-Valent System with DHW.
Serial operation with bypass/mixing valve.
DHW controlled by separate pump.
Hydraulic separator or buffer tank.
CONF=5 Bi-Valent Parallel system
P1=2 DHW pump
The System Controller uses the “zone of greatest demand” strategy for calculating the supply water temperature required
from the Heat Pump (and/or 3-stage electric heater or boiler).
The system controller recognises three “zones”:
Zone 1: The normal heating loop controlled directly by the System Controller (direct or mixed depending on the
systemconguration).
Zone 2: The mixed heating loop controlled by the Extension Controller.
DHW zone: The DHW storage tank loading loop.
Each zone can generate a demand to the heat pump (and/or boiler/electric heater) for a particular supply water
temperature
S1: The supply setpoint water temperature required by the “zone 1” heating loop.
S2: The supply setpoint water temperature required by the “zone 2” heating loop.
SDHW: The supply setpoint water temperature required by the DHW loop.
The actual supply setpoint used at any time is the maximum of the three zone supply setpoints.
SSUP=maximum(S1,S2,SDHW)
ItistheobjectiveofthesystemcontrollertomanagetheHeatPump,3-stageelectricheaterandboilerappropriatelyto
control the supply water temperature (TSUP) to this setpoint (SSUP).
Thediagrambelowshowsthethreepossible“zones”andillustratestherequiredwatertemperatures(S1,S2,SDHW)for
eachzone,andtheresultingoverallsupplysetpoint(SSUP).
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