EasyManuals Logo

Hitachi YUTAKI Series Service Manual

Hitachi YUTAKI Series
262 pages
To Next Page IconTo Next Page
To Next Page IconTo Next Page
To Previous Page IconTo Previous Page
To Previous Page IconTo Previous Page
Page #145 background imageLoading...
Page #145 background image
143
Device control system
SMGB0066 rev.0 - 12/2009
Controller pack
Service Manual
4

HOLIDAY Function
Theholidayfunctionallowsyoutosetaconstanttemperature(default=10°C)foraspeciednumberofdays(from1-99
days).Thisletsyousaveenergyandrelatedcostswhenyouareawayfromhome,butresumesnormaloperationontheday
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 
dayscounterandtemperaturesetting,alongwiththeholiday
indicator
.
Press the 
or time buttons to set the holiday time (1 to 99 days) and press the green buttontoconrm.
Press the 
or buttons to set the holiday temperature (5°C to 35°C) and press the green button to
conrm.
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.

Toadjustonlythetimeduringnormaloperationusethe
or buttonstoadjustthetimeandpressthegreen
buttonagaintoconrmanychanges.



 
Control frequency of
inverter compressor
The frequency control is determined by PI
control,throughthenextparameters:
∆outlettemperatureandwatertarget
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
valveforliquidinjection
- Speciedopeningdegreecontrolledby
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)
(Liquidinjection)
- TurnONifTd≥90ºCcontinue3seconds OFF
Temp.:Temperature
Td: discharge temperature
TsSH: Suction gas super heat
Ps: suction pressure

Table of Contents

Other manuals for Hitachi YUTAKI Series

Questions and Answers:

Question and Answer IconNeed help?

Do you have a question about the Hitachi YUTAKI Series and is the answer not in the manual?

Hitachi YUTAKI Series Specifications

General IconGeneral
Heating Capacity5.0 kW - 16.0 kW
Cooling Capacity5.0 kW - 16.0 kW
Energy Efficiency ClassA+++
RefrigerantR32
Operating Temperature Range (Cooling)46°C
Noise Level (Indoor Unit)45 dB
Noise Level (Outdoor Unit)45 dB

Related product manuals