Heat Pump Configuration - Hitachi YUTAKI Series Installation And Operation Manual

YUTAKI CASCADE CONTROLLER

8.6.2.7 Heat Pump configuration

Water pump configuration:
Configure the water pump of the
heat pump.
See detailed information in the
next page.
Outdoor average temperature:
OTC average is used to neutralise
the effect of occasional temperature
variations.
The average value of outdoor
temperature sampled over a selected
period (between 1 and 24 hours) is
used for the calculation of weather-
dependent set point temperature.
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Water pump configuration
138 PMML0510 rev.1 - 10/2019
Minimum ON time: In order to reduce a possible
compressor damage, demand ON cycles can be
reduced by determining the time that must pass
before accepting new Demand OFF.
Minimum OFF time: In order to reduce a possible
compressor damage, demand OFF cycles can be
reduced by determining the time that must pass
before accepting new Demand ON.
Seizure protection: The pump seizure protection
function prevents sticking of components due
to long periods of inactivity, by running the
components during a short period every week.
Mixing valves and pumps are fully opened and
then fully closed (time depends on Mixing valve
Run Time Factor).
Minimum OFF Time:
Minimum time of the water pump OFF.
• Only when Economic mode is active (DSW)
Minimum ON Time:
Minimum time of the water pump ON.
• Only when Economic mode is active (DSW)
Overrun Time:
Added operation time of water pump after
Demand OFF.