Hitachi YUTAKI Series Installation And Operation Manual page 147
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Also See for YUTAKI Series:
- Service manual (262 pages) ,
- Instruction and operation manual (194 pages) ,
- Instruction manual (32 pages)
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YUTAKI CASCADE CONTROLLER
Solar combination - Total control
ΔT connection:
• Allows to specify a difference temperature
between tank and Panel temperature to
allow solar operation. Solar operation is
allowed in case Panel temperature is "ΔT
connection" ºC above tank temperature.
ΔT disconnection:
• Allows to specify a difference temperature
between tank and Panel temperature to
stop solar operation. Solar operation is not
allowed in case Panel temperature is "ΔT
connection"ºC below tank temperature
Panel antifreeze temperature:
• Minimum Solar panel temperature at
which Solar Pump is switched ON in
order to protect system against frost
formation at pipes due to low ambient
temperature.
Boiler combination
Minimum ON time:
• Time that must pass before stop
boiler after being switched ON
Minimum OFF time:
• Time that must pass before start
boiler after being switched OFF
Wait time for DHW:
• Delay time to start Boiler for DHW
in case all conditions allow Boiler to
start after HP has been started for
DHW.
137
PMML0510 rev.1 - 10/2019
DHW maximum time:
• Maximum time YUTAKI allows to heat tank by means
Solar. At the end of this time Solar pump is stopped
regardless temperature conditions at Solar Panel.
DHW minimum time:
• Minimum Time solar operation cannot be performed
once it has been stopped due to DHW Maximum Time
or due to low temperature at solar panel.
DHWT maximum storage temperature:
• Maximum DHW temperature that allows Solar
operation.
Panel minimum temperature:
• Minimum temperature of the solar Panel to allow Solar
operation
Panel overheat temperature:
• Maximum panel operation temperature at which
Solar Pump is set to off in case Panel sensor reads a
temperature above this value in order to protect system.
• In case Solar pump is stopped due to Panel Overheat
temperature, YUTAKI unit sets Solar overheat output
to high state in case of configured in
inputs, outputs and sensors"
Bivalent point:
• Boiler is allowed to operate in case ambient temperature is
below this value
Combination mode:
• Serial: Boiler operates in series with the heat-pump. The
boiler provides additional peak load capacity and works
together with the HP
• Parallel: Boiler operates in parallel with the heat pump.
The boiler provides the full heating requirements. In case
Boiler is ON, HP is not allowed to operate
Supply setting offset:
• Setting offset for Boiler. Higher values imply earlier
stoppage of Boiler and vice versa.
Waiting time:
• Delay time to start Boiler in case all conditions allow Boiler
to start after HP has been started for Space Heating
DHW by boiler:
• Control to allow heat DHW by means Boiler
"8.6.2.9 Setup of
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