143
Device control system
SMGB0066 rev.0 - 12/2009
Controller pack
Service Manual
4
HOLIDAY Function
Theholidayfunctionallowsyoutosetaconstanttemperature(default=10°C)foraspeciednumberofdays(from1-99
days).Thisletsyousaveenergyandrelatedcostswhenyouareawayfromhome,butresumesnormaloperationontheday
of your return.
To set the Holiday function:
Ensure the Hitachi room unit is running in AUTO (
) or MAN ( ) operating modes.
Press the holiday button to display the holiday
dayscounterandtemperaturesetting,alongwiththeholiday
indicator
.
Press the
or time buttons to set the holiday time (1 to 99 days) and press the green buttontoconrm.
Press the
or buttons to set the holiday temperature (5°C to 35°C) and press the green button to
conrm.
The Hitachi room unit will now control to the new temperature for the set number of days that your home is vacant. At
midnight the holiday counter will be reduced by one until the selected number of days have passed. The Hitachi room unit
will then return to normal operation as set by the AUTO (
) or MAN ( ) mode. To cancel the HOLIDAY function or to exit
the function at any time press the
button a second time.
Toadjustonlythetimeduringnormaloperationusethe
or buttonstoadjustthetimeandpressthegreen
buttonagaintoconrmanychanges.
Control frequency of
inverter compressor
The frequency control is determined by PI
control,throughthenextparameters:
∆outlettemperatureandwatertarget
temperature.
Fixed frequency
Opening degree expansion
valve for main circuit
- Control range of expansion valve
opening degree is determined to
optimize TsSH.
Fully open
Opening degree expansion
valveforliquidinjection
- Speciedopeningdegreecontrolledby
temp. on the top of compressor (Td.).
-
Fan
- Fan Step is controlled according to PS
(Suction pressure)
Fan stop.
4-Way valve (RVR) ON OFF
Solenoid valve (SVG)
(Hot gas bypass)
- Turn ON at starting before 4-way valve
ON.
Turn ON for 1 minute
at defrosting
Solenoid valve (SVI)
(Liquidinjection)
- TurnONifTd≥90ºCcontinue3seconds OFF
Temp.:Temperature
Td: discharge temperature
TsSH: Suction gas super heat
Ps: suction pressure