Shuttle Valves Valve Positions; Valve Position Checks - Nibe HPAC 28 Instrucciones De Instalación Y Mantenimiento

The heating/cooling modes are controlled by 4 shuttle
valves, which, depending on the outdoor temperature,
switch between the different modes.
The lamp on each valve
will be extinguished or lit,
depending on the heating
or cooling mode. A lit
lamp indicates that the
valve is in its output posi-
tion, i. e. it is open in the
direction labelled 1.
Heating
Passive cooling
Active cooling
The above applies when switching on the installation
and in the operating mode in question.

Valve position checks

3 1
1 3
There are signs at the sides of the valves where it can
be checked that the valve outlets point in the direc-
tions described above.
Shuttle valves
Valve positions
129 130
lit lit
lit lit
not lit not lit
1 3
3 1
HPAC 28
131
lit
not lit
not lit
NOTE!
When changing the heating/cooling
mode, there is a delay of
approximately 60 seconds before the
valves change their positions.
GB
29
132
lit
not lit
not lit