7
Buffer Tank
A buffer tank is recommended to ensure a trouble free
heat pump operation. A suitable buffer tank can avoid
excessive heat pump cycling (switching on and off).
The buffer tank provides a hydraulic separation from
the volume flow in the heat pump and heating circuits.
The volume flow in the heat pump circuit remains
constant, even if the heating circuit volume flow is
reduced by thermostatic valves.
If the total of the systems water volume is less than
12L/KW then a buffer tank should be added to reduce
the compressor from ON/OFF cycling. This will
prolong the compressor life span.
When a buffer tank is installed, the heating system
will absorb energy from the buffer tank first. To save
energy consumption ,install the indoor pump P1 that
is switched on only when compressor is on. This is
by changing EV01 indoor pump mode to “work by
regulation”.
Inlet water temp sensor should be taken out of the unit
and put into buffer tank’s sensor pocket. The Inlet water
temp sensor is located on inlet water pipe. The Inlet
water temperature sensor B1 in the buffer tank will
control the tank temperature by starting and stopping
the compressor and pump together as required.
If Inlet water temp sensor has not been changed to
buffer tank’s sensor pocket when EV01 has been
changed to “work by regulation”, when the unit reaches
its set temperature ,the compressor will stop, pump
P1 will also stop accordingly due to EV01 being set
to “work by regulation”. When this occurs ,there is no
water circulation between the heat pump and buffer
tank. Inlet water temp will keep its stopped temperature
,not the buffer tank water temperature. Inlet water
temp sensor B1 then can not switch on compressor and
pump P1 even when buffer tank water is getting cold.
Changing the Inlet water temp sensor into the buffer
tank will avoid this problem.
