Hitachi YUTAKI S80 Series Technical Catalogue page 140

11. Installation configuration
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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 floor 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 floor protection (ATW-AQT-01)
• Additionally, the Auxilliary output signal box accessory (ATW-AOS-01) is available to control the field supplied
Motorized valve for the direct circuit.
1
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 (field supplied)
140
TCGB0075 rev.0 - 11/2012
8
2
5
6
4
3
Item Description
8 LCD controller (accessory)
Second temperature kit
9
(ATW-2KT-01 accessory)
Motorized valve
10
(field supplied)
Aquastat
11
(ATW-AQT-01 accessory)
Low Temperature (35ºC)
High Temperature (80ºC)
11
7
10
Item Description
2nd Water Temperature sensor
A
(ATW-WTS-02 accessory)
B Secondary water pump
C Mixing valve
D Hydraulic separator
E Shut-off valve
A
B
C
D
9
E