Hitachi YUTAKI Series Installation And Operation Manual page 72

ELECTRICAL AND CONTROL SETTINGS
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Smart tariff (Default for input 5)
This function can be used to block or limit the heat pump. It allows an external Smart switch device to switch off or limit the heat
pump during a period of peak electricity demand. Terminals 16 and 19 of the TB2.
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DHW boost (Default for input 6)
This function allows a request for a one-time heating up of the domestic hot water temperature. The input can be sent by a push
button, a NC contact and a NO contact. This input is switched on terminals 16 and 20 of the TB2.
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Power Meter (Default for input 7)
This function is used to monitor real consumption of the system by means an external power meter device connected at this input.
The calculation method is done by measuring real consumption of the whole installation with one power meter device or 2 separate
power meter (one for indoor unit and another one for outdoor unit.
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Aquastat for circuit 1
Aquastat is a security accessory to control in order to prevent high water temperature entering into floor system (Circuit 1). This
devices must be connected to terminals 22 & 23 for circuit 1.
When this devices is activated because of the high temperature of the water, it stops the water pump in order to stop the flow of
water to the heating floor.
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N O T E
For R410A models, Yutaki S R32, Yutaki S COMBI R32, terminals 28 & 29 for circuit 2 are available.
In case of YUTAKI S COMBI UK model, Domestic Hot water tank security thermostat its connected to terminals 22&23 and this
funcion is not available for circuit 1.
62 PMML0510 rev.1 - 10/2019
16
Common
Line
16
Common
Line
16
Common
Line
22
C
19
T
T
Smart F.
Input 5
20
DHW Boost
input 6
21
23
1
Second Aquastat
Circuit 1 (for WP)
Power M.
input 7