Hitachi YUTAKI S80 Series - Page 141

11. Installation conguration
TCGB0075 rev.0 - 11/2012
141
11
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Two space heating (High & Low water temperature) and DHW Tank (Installation example 4)
Two space heating applications (High & Low water temperature) and DHW Tank: When the split air to water heat pump is
connected to two different heating circuits, circuit 1 will be direct (high temperature for radiator operation) and circuit 2 will
be a mixing circuit in order to have a second temperature control using mixing valve motor (low temperature for oor hea-
ting operation). Additionally, a motorized valve must be added in order to close direct circuit when not in use. In order to get
these two water temperature levels (high and low), a mixing station is required. This mixing station is controlled using the
indoor unit by means of an additional mixing valve motor and additional water sensor. Domestic Hot Water Tank is heated
by Heat Pump. The space heating and domestic hot water tank operation is alternated (or heating or DHW tank). Optional
room thermostat. The LCD is integrated with the DHW Tank.
N O T E
• WhenYUTAKIS80isworkingwithtwospaceheatingapplications(High&Lowwatertemperature),itisneces-
sarytoinstallthe2ndtemperaturekitaccessory(ATW-2KT-01)andthefollowingaccessories:
 -Watertemperaturesensorforsecondtemperaturecontrol(ATW-WTS-02Y)
 -Mixingvalvemotor(ATW-MVM-01)
 -Aquastatforheatingoorprotection(ATW-AQT-01)
• Additionally,theAuxilliaryoutputsignalboxaccessory(ATW-AOS-01)isavailabletocontroltheeldsupplied
Motorizedvalveforthedirectcircuit.
Item Description
1 Outdoor unit
2 Indoor unit
3 R134a compressor
4 Water pump
5 3-way valve
6 T-branch
7 Shut-off valves (eld supplied)
8 Domestic hot water tank
Item Description
9
Security valve
(DHWT-SWG-01 accessory)
10
DHWT heater
(integrated with DHWT)
11
LCD controller
(integrated with DHWT)
12
Second temperature kit
(ATW-2KT-01 accessory)
13
Motorized valve
(eld supplied)
Item Description
14
Aquastat
(ATW-AQT-01 accessory)
A
2nd Water Temperature sensor
(ATW-WTS-02 accessory)
B Secondary water pump
C Mixing valve
D Hydraulic separator
E Shut-off valve
B
12
C
A
Domestic
Water
13
High Temperature (80ºC)
Low Temperature (35ºC)
1
7
4
6
5
3
2
DHW Tank
9
11
8
10
D
E
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