E-29
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Program Description 9.5
Block by request for swimming pool water:
If the temperature in the cylinder is higher than 35 °C (value is
adjustable from 10 – 50 °C in the menu Settings - 2nd heat
generator - Overtemperature), the heat pump is blocked by a
pending request for swimming pool water. It is not enabled again
until the temperature in the buffer tank connected in parallel is 5K
under the switching temperature.
As soon as one of the three blocks described occurs, the heat
pump is blocked, and the following message is displayed: HP
waiting, Block BR. The output of the 2nd heat generator is not
activated.
Mixer control:
If there is no block by bivalent-regenerative, the mixer is switched
to continuously CLOSED.
If there is a bivalent-regenerative block because of domestic hot
water or swimming pool, the mixer is switched to continuously
OPEN.
If there is a bivalent-regenerative block because of heating,
mixer regulation is active.
9.5 Power Regulation
The heat pump manager can define a maximum of 3 power
stages, L1, L2 and L3, which it switches depending on the heat
consumption. Rising heat consumption causes the next highest
power stage to be switched, falling heat consumption the next
lowest.
L1: Heat pump operates with one compressor
L2: Heat pump operates with two compressors
L3: Heat pump operates and 2ndheat generator is active
(not with monovalent systems)
The heat pump manager always starts in power stage L1
after start-up or a power failure.
The power stages are not redefined during defrosting,
preparation of swimming pool water, a request for domestic
hot water or a utility block.
9.5.1 Heat Pumps with one Compressor
Criteria for a switchover:
From L1 to L3 if the heating controller demands “more heat”
for more than 60 minutes and the external temperature is
simultaneously under the limit temperature of the 2nd heat
generator for more than 60 minutes.
From L3 to L1 if the heating controller demands “less heat”
for more than 15 minutes or the limit temperature is
overshot.
9.5.2 Heat Pumps with Two Compressors
Criteria for a switchover:
From L1 to L2 if the heating controller demands “more heat”
for more than 25 minutes,
From L2 to L3 if the heating controller demands “more heat”
for more than 60 minutes and the external temperature is
simultaneously under the limit temperature for more than
60 minutes.
From L3 to L2 or L1 if the heating controller demands “less
heat” for more than 15 minutes or the limit temperature is
overshot.
From L2 to L1 if the heating controller demands “less heat”
for more than 15 minutes.
In power stage L1, one of the heat pump's compressors is
switched on or off according to the “more” or “less” signals from
the heating controller. In stage L2, one of the heat pump's
compressors operates continuously to cover the base load. The
second compressor is switched on or off according to the “more”
or “less” signals from the heating controller. In stage L3, both
compressors operate continuously to cover the increased base
load. The 2nd heat generator is regulated. Only one compressor
ever operates during defrosting.
Power stage
Heat pump with
one compressor
Heat pump with
two compressors
Stage L1 One compressor switching only One compressor switching only
Stage L2 - 1 compressor base load, 1 compressor
switching
Stage L3 One compressor and 2nd heat generator, if
required
Both compressors and 2nd heat generator
Defrost Compressor running One compressor running
DHW heating Compressor running One or two compressors running depending on
the external temperature
Swimming pool heating Compressor running One or two compressors running depending on
the setting
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