Page 14
Section 5: Operation
Set the parameters as detailed in the table below.
Table 5-2:
Aerona³ heat pump p
arameter settings for assisting defrost process
Level
Parameter
Function description
Display and input value
Group
Code
Default
Min.
Max.
Setting
I
46 00
Backup heater type of function
0 = disable
1 = Replacement mode
2 = Emergency mode
3 = Supplementary mode
0
0
3
3
I
46 20
Freeze protection functions
0 = disable
1 = enabled during start-up
2 = enabled during Defrost
3 = enabled during start-up and Defrost
0
0
3
2
I
46 23
Outgoing water set point during Defrost
24
10
50
30
I
51 46
Terminal 46: DHW electric heater or
Backup heater
0 = DHW electric heater
1 = Backup heater
0 or 1
0
1
1
! NOTE !
Refer to the Aerona³ installation instructions, supplied with
the heat pump, for further details on how to access and
adjust the above heat pump parameters.
5.4
PARAMETER SETTINGS FOR ASSISTING
DEFROST PROCESS
Depending on the overall system volume in place at the time
of the defrost, it may be useful energising the supplementary
immersion heater fitted to the Grant Combined volumiser/low loss
header to assist the defrost process.
The overall time for a defrost should never be more than 5
minutes (including the compressor protection ‘off’ time of 3
minutes) so the total power used during a defrost period by the
immersion element would not be more than 250W.
After the defrost function is completed, the immersion heater will
switch off when the flow temperature has reached the minimum
flow target temperature (Parameter 46 23) + 5ºC
5.5
PARAMETER SETTINGS FOR LEAD / SUPPLEMENTARY HEAT PUMP OPERATION
Set the parameters as detailed in the table below.
Table 5-3:
Lead heat pump settings
Level
Parameter
Function description
Display and input value
Group
Code
Default
Min.
Max.
Setting
I
46 00
Backup heater type of function
0 = disable
1 = Replacement mode
2 = Emergency mode
3 = Supplementary mode
0
0
3
3
I
46 01
Manual water set point
50°C
40
55
55
I
46 04
Heater activation delay time
5 mins
0
900
0
I
46 05
Integration time for starting heaters
600
0
900
0
I
46 13
Outdoor air temp to enable backup
heaters (supplemantary mode)
5.0°C
-20.0
+20
10
I
46 14
Outdoor air hysteresis to disable
Backup heaters
5.0°C
0.5
10.0
2
I
51 46
Terminal 46: DHW electric heater or
Backup heater
0 = DHW electric heater
1 = Backup heater
0 or 1
0
1
1
! NOTE !
Refer to the Aerona³ installation instructions, supplied with
the heat pump, for further details on how to access and
adjust the above heat pump parameters.
