Table of Contents
Advertisement
Operation in the start guide
Arrows forwards and backwards
A.
Scroll bar
Language
English
B.
Option / setting
Scroll bar
A.
Here you can see how far you have come in the start guide.
Drag to the right or left with your finger to browse between
the pages.
You can also press the arrows in the top corners to browse.
Option / setting
B.
Make settings for the system here.
28
Chapter 6 | Commissioning and adjusting
SETTING PUMP SPEEDS
Pump adjustment, automatic operation
Brine side
To set the correct flow in the brine system, the brine pump
must run at the correct speed. S1256PC has a brine pump
that is controlled automatically in standard mode. Certain
functions and accessories may demand that it be run
manually, in which case the correct speed must be set.
TIP
For optimum operation when several heat pumps
are installed in a multi-installation, all heat pumps
should have the same compressor size.
This automatic control occurs when the compressor is run-
ning and sets the speed of the brine pump so that the optim-
um temperature difference between the supply and return
lines is attained.
Climate system
To set the correct flow in the climate system, the heating
medium pump must run at the correct speed. S1256PC has
a heating medium pump that can be automatically controlled
in standard mode. Certain functions and accessories may
demand that it be run manually, in which case the correct
speed must be set.
This automatic control takes place when the compressor is
running and sets the speed of the heating medium pump,
for the relevant operating mode, so the optimum temperat-
ure difference between the supply and return lines is ob-
tained. During heating operation, the set DOT (dimensioned
outdoor temperature) and temperature difference in menu
7.1.6.2. are used. If necessary, the maximum speed of the
circulation pump can be limited in menu 7.1.2.2.
Pump adjustment, manual operation
Brine side
S1256PC has a brine pump that can be automatically con-
trolled. For manual operation: deactivate "Auto" in menu
7.1.2.7 and then set the speed according to the diagram be-
low.
Caution
When passive cooling is used, the brine pump
speed must be set in menu 7.1.2.7.
Set the pump speed when the system has come into balance
(ideally 5 minutes after compressor start).
Adjust the flow so that the temperature difference between
brine out (BT11) and brine in (BT10) is between 2 - 5 °C. Check
these temperatures in menu 3.1 "Operating info" and adjust
the brine pump's (GP2) speed until the temperature differ-
ence is obtained. A large difference indicates a low brine
flow and a small difference indicates a high brine flow.
NIBE S1256PC
Advertisement
Table of Contents
