Operation By Dc24V Input (Remote Control) - Hitachi RCUE40AG2 Service Manual

Control system

ATTENTION:
Dip Switch for this control should be set before power ON.
−
Local external Thermo does not run/stop by pulse signal order.
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Normal operation order and heat storage operation order shall be input to Chiller unit separately.
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Local external Thermo order shall have at minimum 5 minutes interval of continuous operation order (5 min in
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case of stop).
Additional wiring shall be put into a metal pipe independently, or shield line shall be used.
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During control by external Thermo, Chiller unit stops when water temperature reaches to the setting value of
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Chiller unit, and automatically starts again. Therefore, set the temperature in external Thermo higher than that
of chiller unit.
If Thermo setting value of body side is set "higher" at cooling and "lower" at heating, unit is stopped earlier than
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the stop order from external Thermo.
Switch normal / heat storage operation during unit stop.
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4.11. Operation by DC24V input (Remote Control)

1. Outline
Operation control by DC24V is explained here.
Operation signal pattern: 1. Level input, 2. 1 pulse input, 3. 2 pulse input.
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Set as follows and perform additional wiring in each 3 cases.
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This control is not compatible with other remote Run/Stop order.
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2. Level input
a) Signal and basic sequence
Terminal
pag. 65
SMGB0003 rev.0-01/2007
Arrangement
in local
Run/Stop switch
(prepared in local)
Alarm output
(DC24V, under 0.8A)
Relay coil etc for
DC24V (prepared in
local) (Relay coil has
electricity at alarm
occurrence)
Note: Do not connect
LED or relay built-in
diode.
4 4
Switch
Switch