Hitachi YUTAKI M RASM-3WF2E Installation And Operation Manual page 47

◆ 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).
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
PMEN0657 rev.0 - 02/2024
16
Jumper
23
21
Power Meter
input 7
22 23
C 1
Second Aquastat
Circuit 1 (for WP)
6
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