DHW Loading

The DHW loading is the same as described in “Solar Control feeds the DHW”. All the switching conditions and setting rules are the same.

The solar pump will switch on or the variable speed pump starts with its maximum speed (POW-01) if:

where

delta Ton = SOLP-01 + (20 - FilteredOATemp) * (SOLP-03 - SOLP-01)/ 35

whereas FilteredOATemp is the filtered outside air temperature


When the outdoor temperature > 20°C, delta Ton is equal to SOLP-01.

Table 7.   Parameter List

Description

Value Range

Default Value

Unit

SOLP-01: temperature difference to switch on at OAT >= 20 °C

-30 … 30

6

K

SOLP-02: temperature difference to switch off/ over

-30 … 30

3

K

SOLP-03: temperature difference to switch on when the OAT = -15 °C

-30 … 30

6

K

PMP-03: pump minimum off time

0…120

20

sec