Hitachi FSG Series, Technical Catalogue

Page: 190 / 424

10
/14
AVAILABLE OPTIONAL FUNCTIONS
10.3.3. DEMAND (
!
! !
!
)
In the case that the demand input terminals on the outdoor
unit printed circuit board are short-circuited, compressor(s)
is stopped. (In this case, the indoor unit(s) is put under
thermo-OFF condition.) The stoppage code No. "10" is
given. By disconnecting the demand switch contact,
restarting is available. The following indicates an example
for Demand at input 3 (between 1 and 2 pins of CN18).
Wiring Diagram Example of Demand Control
10.3.4. SNOW SENSOR
In the case that the input terminals of the snow sensor are
short-circuited during compressor stoppage, all the outdoor
fan motors are operated at the full speed. However, if the
compressor is called for compressor operation, the fan
operation is changed to the normal operation. If the input
terminal is opened, the fan(s) is stopped. This function
protects the outdoor units from a condition covered with
snow.
Wiring Diagram Example of Snow Sensor
10.3.5. ENFORCED STOPPAGE (
#
# #
#
)
The compressor is stopped and the indoor fan motor is
stopped when the forced stoppage input terminals(CN18
#1~ #2) on the outdoor unit PCB is short-circuited during
running. However, the remote control switch display remains
at the same mode and the stoppage cause code "d1" will be
No."10". In this case, if the input terminals are opened,
operation is resumed.
Wiring Diagram Example of Forced Stoppage:
Ourdoor Unit PCB
3P Connector
SS3: Demand SW.
Control Circuit
Power
Source
Ourdoor Unit PCB
3P Connector
SS3: Forced Stoppage SW.
Control Circuit
Power
Source
Ourdoor Unit PCB
3P Connector
SS3: Snow sensor SW.
Control Circuit
Power
Source