Heat Pump - Viessmann VITOCAL WPR 300 Service Instructions Manual

Heat pump

The WPR 300 heat pump control unit is suitable for the following heat pumps:
& Vitocal 300-G, type BW, BWC, WW, WWC
& Vitocal 300-A, type AWC-I, AW-O
Different parameters are available in the control unit subject to type and equip-
ment level. Parameters associated with a particular type are enabled via the
coding card. Each compressor installed and each compressor level must be
enabled individually ("Enable", 5000, 5100).
Note
The compressor parameters have the
numbers 5xxx, where 50xx describe
the parameters of compressor stage
1, and 51xx describe the same para-
meters of compressor stage 2.
Starting and stopping the compressor
If one of the following conditions is
met, the compressor starts:
& The flow temperature of the second-
ary circuit falls below (exceeds in
active cooling mode; not for the
Vitocal 300-A) the set flow tempera-
ture by more than "Hysteresis sec-
ondary" (7304).
& A heat demand is present via a
heating water buffer cylinder, DHW
cylinder or swimming pool.
In addition, the following conditions
must be met at the same time:
& "Start delay" (5008) has expired.
& Min. return temperature "Min.
return temp." (5002) has been
exceeded.
Function description
& Temperature has fallen below the
max. inlet temperature of the pri-
mary circuit "Max. t primary inlet"
(5015) by "Hysteresis primary"
(5004).
& Minimum inlet temperature of the
primary circuit "Min. t primary
inlet" (5016) has been exceeded by
"Hysteresis primary" (5004).
At the beginning of the start delay, the
primary pump starts, or the fan for air/
water heat pumps. To create even,
stable thermal conditions for reliable
temperature capture, the secondary
pump also starts.
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