Hydraulic Buffer Relief (Hbr) - Honeywell SDC Service Manual

SDC / DHC Hydraulic Components
7.3.8

Hydraulic buffer relief (HBR)

1 Buffer tank
Function Using a 3-way switching valve (output active), hydraulic buffer
relief (HBR) causes temporary intake into the upper region of the
buffer tank, if that region has not reached its setpoint temperature
yet, so that connected heating or hot water circuits receive priority
supply of energy.
When the buffer temperature exceeds the buffer setpoint by 2.5
K, the 3-way switching valve is hydraulically coupled to the lower
region of the buffer tank so that the entire buffer tank can be
loaded. Another switch-over to the upper region of the buffer tank
is initiated as soon as the buffer temperature undershoots the
buffer setpoint temperature by 2.5 K.
Application Partial buffer loading with priority supply for heating and hot water
for all types of loading control modes (see buffer control modes 1,
2 and 5)
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