section 8: operation
Page 45
8.8 low tariff
The purpose of this function is to heat any thermal stores and DHW
cylinders at a time when electricity rates are inexpensive.
This can be achieved by using an external contact, e.g. a
timeswitch (with volt free contacts) connected between terminals
30-31 on the PCB terminal.
To enable these terminals, parameter 5130 must be set to 1. Refer
to Table 8-29.
When low tariff function is activated the heating set point (calculated
by the climatic curve) increases for heating (parameter 2151) by the
low tariff differential water set point (refer to Table 8-29).
Low tariff contact
Contact OPEN = Low tariff OFF
Contact CLOSE = Low tariff ON
30
31
Terminal PCB
Low
tariff
figure 8-28:
Low tariff mode
Parameter 5128 (night mode) and parameter 5130 (low tariff)
are automatically synchronized to same value.
If parameter 5128 is changed to 1 (enable), then parameter
5130 will be also changed to 1 (enable).
! nOtE !
During low tariff with low tariff contact on, if parameter 5130
is changed to 0, the heat pump will continue to operate in low
tariff.
During low tariff by the remote controller button, if parameter
5128 is changed to 1, the heat pump will follow the signal of
on/off by low tariff contact.
! nOtE !
table 8-29:
Low tariff mode parameters
level
Parameter
function description
Display and input value
remarks
Group
code
Default
Min.
max.
Unit
I
51 30
Terminal 30-31 : Low tariff
0=disable (Remote controller only)
1=enable
0
0
1
-
Parameter 5128
and parameter
5130 are
synchronized in
same value
I
21 51
Low tariff deferential water set point for Heating
5.0
0.0
60.0
0.5°C
For details of how to access the parameter settings, refer to Section 9.3.
Summary of Contents for Aerona3 HPID12R32
Page 71: ...NOTES Notes Page 71...
