Heat Pump Configuration - Hitachi YUTAKI Series Installation And Operation Manual

UNIT CONTROLLER

7.8.2.8 Heat Pump configuration

Water pump configuration:
Configure the water pump of the
heat pump.
See detailed information in the
next page.
Night shift:
Reduces compressor load in order
to reduce environmental noise,
preferably at night.
See detailed information in the next
page.
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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.
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).