Heating Curve Adjustment; Circuit Operation - Grant Aerona HPIDR32SMART6 Installation & Operating Instructions Manual

The Smart Controller can increase or decrease the Heat pump
target flow temperature, calculated in accordance with the heating
curve, if it exceeds the temperature range for the given circuit set
in controller service menu.
7.13.2

HEATING CURVE ADJUSTMENT

The heating curve is adjustable and should be reviewed to ensure
both comfort and economy.
The heating curve can be set as part of the initial system
configuration when configuring 'WEATHER' control or be edited
after the system configuration has been completed. Refer to
Section 7.3.1.3 to access the heating curve setting adjustment,
Figure 7-17 and Online resources for a QR code link to a 'how-to'
video on adjusting the circuit heating curve.
Guidelines for adjusting a heating curve
• If the outdoor temperature drops, and the room
temperature increases, the selected heating curve value
is too high.
• If the outdoor temperature drops, and the room
temperature drops as well, the selected heating curve
value is too low.
• If during frosty weather the room temperature is
comfortable, but when it gets warmer the room is too cold,
it is recommended to increase the Heating curve shift and to
select a lower heating curve.
• If during frosty weather the room temperature is too
cold, and when it gets warmer the room is too hot, it is
recommended to decrease the Heating curve shift and
to select a higher heating curve.
Poorly insulated buildings or the use of traditional steel radiators
require setting higher heating curves. Well insulated buildings
and/or low temperature heat emitters e.g. Underfloor heating,
heating curves will have a lower value.
7.14

CIRCUIT OPERATION

7.14.1 UNCOMPENSATED CIRCUITS
Circuits can be configured with a preset water temperature for the
circuit, which can either be managed with or without a thermostat.
Without a thermostat
• The circuit with be supplied with a fixed water flow
temperature for the scheduled day/occupied time period
of the circuit. The temperature is determined by 'FIXED
PRESET WATER TEMPERATURE', set during system
setup or in the Circuit settings.
• During a scheduled night/unoccupied time period, the fixed
water flow temperature will be reduced by the configured
value 'DECREASING FIXED WATER TEMPERATURE' set
during system setup or in the circuit settings.
• If a water temperature sensor is installed on circuits 2 or 3,
you have the ability to stop the circuit demand by enabling
'CIRCUIT STOP FROM PRESET TEMP'. Once the water
temperature reaches the desired temperature the circuit
demand will stop.
With a thermostat
• Target air temperature is set on the assigned thermostat and
the 'FIXED PRESET WATER TEMPERATURE' is supplied
to the heating circuit and will operate in a similar fashion to
without a thermostat
• If 'THERMOSTATIC PUMP BLOCKADE' is enabled,
the circuit demand will be stopped once the target air
temperature set on the thermostat is reached.
• If 'THERMOSTATIC PUMP BLOCKADE' is not enabled, once
the target air temperature is achieved the smart controller
will use decrease the flow temperature target by the
'DECREASING FIXED WATER TEMPERATURE' value,
which is set correctly will maintain the target air temperature.
Refer to 7.3.1.3 for recommended setback values based on
heat emitters for the circuit.
Section 7: Touchscreen Display Operation and Settings
7.14.2 WEATHER COMPENSATED CIRCUITS
The Outdoor weather sensor must be installed and configured to
be able to use weather compensation control. Refer to Table 5-4
for recommended weather compensation curve settings based on
heat emitters.
'SHIFT' is used to further target a room temperature value. The
target preset room temperature should be achieved with a base
value of 20°C plus the heating curve shift value.
Without a thermostat
• Target flow temperature is calculated based on current
ambient air temperature, from the heating curve & shift set
for a scheduled day/occupied period.
• If a water temperature sensor is installed, once the target
flow temperature is achieved the smart controller will
decrease the flow temperature target by the 'DECREASE
WATER TEMPERATURE' value, which if set correctly will
maintain the target design temperature for the circuit.
• During a scheduled night/unoccupied time period, the water
flow temperature will be reduced by the configured value
'DECREASE WATER TEMPERATURE' set during system
setup or in the circuit settings.
• If a water temperature sensor is installed on circuits 2 or 3,
you have the ability to stop the circuit demand by enabling
'CIRCUIT STOP FROM PRESET TEMP'. Once the water
temperature reaches the desired temperature the circuit
demand will stop.
With a thermostat
• When a target air temperature is set on the assigned
thermostat, the smart controller calculates flow based on
ambient temperature, heating curve and current circuit air
temperature.
• If 'THERMOSTATIC PUMP BLOCKADE' is enabled,
the circuit demand will be stopped once the target air
temperature set on the thermostat is reached.
• If 'THERMOSTATIC PUMP BLOCKADE' is not enabled,
once the target air temperature is achieved the smart
controller will use decrease the flow temperature target by
the 'DECREASE WATER TEMPERATURE' value, which
is set correctly will maintain the target air temperature. Refer
to 7.3.1.3 for recommended setback values based on heat
emitters for the circuit.
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