Hitachi SAMURAI Series Service Manual page 37

Condenserless water chillers
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2. Control Functions
Control functions on the module

Pulse input type 1
a. Signal aspect and basic sequence
For wiring
Time chart
N O T E
Pulse input indicates an ON input of the same switch when changing the status of the chiller unit, as shown in the
diagram above.
30
SMGB0097 rev.0 - 07/2015
Terminal
board
Section arranged as a local work
Run/stop switch (to be 
prepared locally)
Alarm output (DC24V, less than 0.8A)
More than 
200ms
ON
Switch
OFF
Keep more than 5 
minutes
Run
Chiller 
unit
Stop
Relay coil for DC24V, etc. (to be prepared 
locally) (The relay coil is powered on in 
case of alarm) Do not connect a LED or a 
relay of internal diode type.
More than 
200ms

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