Grant Aerona3 Series - 8 OPERATION; Heat Pump Operation Modes

Section 8: OperationPage 36
8.1 Heat Pump Operation
The heat pump control is based on:
1. Outgoing water temperature (measured by outgoing water temperature
sensor on heat pump)
2. Thermal store temperature
During heating operations, parameter 4100 is set to 1. The control of the heat
pump is based on the outgoing water temperature.
The operation by water temperature can be “outgoing water temperature” or
“thermal store temperature”. If parameter 5111 is set to “enable” for thermal
store temperature sensor. In this case the operation will be based on thermal
store temperature.
Set the parameter correctly for enable/disable of thermal store (parameter
5111), the main water pump setting (parameter 4200). Refer to Table 8-1.
Table 8-1: Parameters
Parameter 5111
thermal store
temperature
Parameter 4100
heat pump
ON/OFF
Parameter
4200 main
water pump
Outgoing water
temperature
0=disable 1=Water set point
0=always ON
2=detect cycle
Thermal store
temperature
1=enable 0=room set point
0=always ON
1=thermal store
temperature
2=detect cycle
For further information, refer to Section 3.8 (volumiser tanks).
8.1.1 Heat Pump controlled based on Outgoing Water
Temperature
Based on the outgoing water temperature setting, the compressor is controlled
and turned ON/OFF.
Start of Operation
When the outgoing water temperature is below the water set point, the heat
pump is turned ON.
Heating : Outgoing water temp ≥ Water set point (parameter 2100~2105) –
Hysteresis (parameter 2141)
Compressor Control
The compressor is controlled so that the Outgoing water temperature can
reach the water set point.
When the water setpoint temperature is reached, compressor is
stopped
With the minimum compressor frequency, if the Outgoing water temperature is
in the following conditions, or if the Outgoing water temperature reaches the
water set point to protect heat pump, then compressor shall be turned OFF.
Heating : Outgoing water temp. ≥ Water set point (parameter 2100~2115)
+1°C
Outgoing water temp. ≥ 60.5°C
Compressor OFFON control
When the Outgoing water temperature reaches the set point and after
Table 8-2: Parameters
Level
Parameter
Function description
Display and input value
Remarks
Group Code Default Min. Max. Unit
I 41 00
The heat pump turns ON/OFF based on
1=water set point
1 0 1 -
To be set to
the following
combinations
parameter 5111=0
→Parameter 4200=0
or 2
parameter 5111=1
→Parameter 4200=0
or 1 or 2
I 42 00
Type of configuration of main water pump
0=always ON
1=ON/OFF based on buffer tank temperature
2=ON/OFF based on detect cycles
0 0 2 -
I 51 11
Terminal 11-12: thermal store temperature probe
0=disable
1=enable
0 0 1 -
For details of how to access the parameter settings, refer to Section 9.3.
the compressor is turned OFF, or when the conditions below are met, the
compressor shall be turned ON.
However, the compressor is not turned ON during 3 minutes OFF-ON waiting
time.
8.1.2 Heat Pump controlled based on Thermal Store
Temperature
In order to reach the thermal store set point, compressor frequency shall
be controlled so that outgoing water temperature can reach the maximum
temperature in Heating mode (60°C) And, the compressor is turned ON/OFF
based on thermal store set point also being reached.
Start of Operation
When the Outgoing water temperature does not reach the water set point,
heat pump is turned ON.
Compressor Control
The compressor is controlled to reach the maximum flow temperature in
Heating mode (60°C).
When the water set point is reached, compressor is stopped
The compressor shall be turned OFF if the thermal store set point is reached,
or if the Outgoing water temperature is in the following conditions, or the
Outgoing water temperature reaches the set point to protect heat pump.
Heating: thermal store temperature ≥ thermal store set point (parameter 2161)
Outgoing water temp. ≥ Maximum Outgoing water set point (60°C) +1°C
Outgoing water temp. ≥ 62.5°C
Compressor OFFON control
When the thermal store temperature reaches the set point, or when the
conditions below are met after the compressor is turned OFF due to the set
point protecting the heat pump, the compressor is turned ON.
However, the compressor is not turned ON during 3 minutes OFF-ON waiting
time.
Heating: thermal store temp. ≤ thermal store set point (parameter 2161) –
Hysteresis (Parameter 2141)
Outgoing water temp. ≤ Water set point (60°C) – Hysteresis (parameter
2141 )
Outgoing water temp. ≤ 57.5°C
8 OPERATION