Hitachi YUTAKI S80 Series - Page 140

11. Installation conguration
TCGB0075 rev.0 - 11/2012
140
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Two space heating (High & Low water temperature) (Installation example 3)
Two space heating (High & Low water temperature): 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 heating operation). Additionally,
a motorized valve must be added in order to close the direct circuit when it is 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. Optional Room Thermostat. The necessary LCD
controller is supplied as accessory.
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.
High Temperature (80ºC)
Low Temperature (35ºC)
1
7
4
6
5
3
2
8
B
9
C
A
10
E
D
11
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)
Item Description
8 LCD controller (accessory)
9
Second temperature kit
(ATW-2KT-01 accessory)
10
Motorized valve
(eld supplied)
11
Aquastat
(ATW-AQT-01 accessory)
Item Description
A
2nd Water Temperature sensor
(ATW-WTS-02 accessory)
B Secondary water pump
C Mixing valve
D Hydraulic separator
E Shut-off valve