Hitachi RCUE40AG2 Service Manual page 64

Control System
d) Wiring for the switch and external Thermo contact input
Wire as follows.

NOTE:
AC: Air-conditioning
HS: Heat Storage
4. Setting method of second temperature
Second temperature setting mode is set by pressing "▼" switch for more then 3 sec. on indication PCB with
Unit power ON. By pressing "▲or▼" switch during this mode, each second temperature of chilled water
temperature and warm water temperature is set.
Second temperature set mode

Press "▼" switch on normal display on 7 segment more than 3 seconds with Unit power ON. Indication
−
of the segment is changed to "tS-Cd" and it is indicated alternatively with actual chilled water second
temperature setting value.
With this status, by pressing "▲or▼" switch, indication of the segment is changed to "tS-Hd" and it is
−
indicated alternatively with actual warm water second temperature setting value (heat pump units).
And, by pressing "▼" switch on indication PCB more than 3 seconds, we return to normal indication
−
display.
pag. 62
SMGB0003 rev.0-01/2007
External
Thermo
Contactor
In this case, 6ºC
With short circuit wiring
Don't connect
In this case, 48ºC