Hitachi YUTAKI M Bedienungsanleitung Seite 50

◆ 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.
◆ 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.
Common
Line
◆ 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.
Terminals 22 and 23 are jumped if there is no Aquastat connected. In case of setting an installation
with Aquastat, remove the jumper between terminals 22 and 23 of the Terminal board 2 and
connect the Aquastat as shown in the following picture.
22
PMEN0647 rev.0 - 11/2023
16
Common
Line
16
Jumper
23
20
DHW Boost
input 6
21
Power Meter
input 7
22 23
C 1
Second Aquastat
Circuit 1 (for WP)
6
42