Section 8: Operation Page 47
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
8-27.
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 8-27).
Low tariff contact
Contact OPEN = Low tariff OFF
Contact CLOSE = Low tariff ON
30
31
Terminal PCB
Low
tariff
Figure 8-26: Low tariff mode
Table 8-27: 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.
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).
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
NOTE
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