Hitachi YUTAKI Series Instruction And Operation Manual page 119

ELECTRICAL AND CONTROL SETTINGS
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Smart tariff (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 (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 (input 7)
This function is used to limit the heat pump which is controlled by an external power meter device. 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 and circuit 2 (for WP and WP2)
Aquastat is a security accessory to control the water temperature of circuit 1 and circuit 2 usually enabled for the control of the
temperature of the radiant floor.
Only for UK market, terminals 22 and 23 are for the connection of the limit thermostat.
107 PMML0335A rev.1 - 04/2016
16
Common
Line
16
Common
Line
16
Common
Line
22 23
C 1
Second Aquastat
Circuit 1 (for WP)
19
T
T
Smart F.
Input 5
20
DHW Boost
input 6
21
Power M.
input 7
28 29
C 1
Second Aquastat
Circuit 2 (for WP2)