Programming With Remote Controller; Description Of Optional Input Signals - Hitachi RCI-1.0FSR Service Manual

5 Optional functions
Indoor units input and output signals

5.1.3 Programming with remote controller

For a complete and detailed explanation regarding the programming with the remote controller, refer to the Remote
controller Installation and Operation Manual.

5.1.4 Description of optional input signals

Control by field-supplied room thermostat
On-screen display: 01 or 02.
When a field-supplied room thermostat is used instead of the inlet thermistor on the indoor unit, connect the wiring and
use the materials as indicated in
?
N O T E
• The contact capacity of a thermostat shall be DC12V and several ma. Select a thermostat which makes and breaks the contact with
this capacity.
• Make the wires CN3 as short as possible. Do not install the wires along the 220-240V power line. Install them more than 30cm away
from each other. (Intersecting them is acceptable.) If the wires are installed along the power line, comply with the following points to
prevent noise.
- Pass either of the low voltage wire and 220-240V power line through a metal tube and ground one end.
- Use a shielded wire for a low voltage wire and ground one end. The maximum wiring length is 70m.
• When using this function, it is recommended to use safety devices such as an electric leakage breaker or smoke detector, etc. as this
is unattended function.
• For a thermostat, do not use a thermostat which contains mercury for switch, because chattering is likely to occur at ON/OFF.
• Use a thermostat with a differential of 1.5deg. or more.
• Comply with the following points. If not, a high-voltage circuit breaker will be activated or the unit will repeat ON/OFF operations.
- Install a thermostat where the air inlet temperature can be measured accurately.
- Install a thermostat where the suction air from the unit does not blow directly against it.
• When using room thermostats, set each room thermostat (for cooling and heating) correctly. If one of them is set incorrectly, other
room thermostats do not operate.
Example:
• Room thermostat Input (for Cooling) is set to terminals 2 and 3 of CN3
• Room thermostat Input (for Heating) is set to terminals 1 and 2 of CN3
Operation
• Cooling operation: Compressor is ON by closing terminals 2 and 3 of CN3
Compressor is OFF by opening terminals 2 and 3 of CN3
• Heating operation: Compressor is ON by closing terminals 1 and 2 of CN3
Compressor is OFF by opening terminals 1 and 2 of CN3
Cooling
ON
Signals 2 and
OFF
3 of CN3
ON
Compressor
OFF
98 SMGB0137 rev.0 - 05/2021
"5.1.1 Available ports".
3P Connector
3
2
1
CN3
3
2
1
Indoor unit PCB
Time
Thermostat
Temperature
increase
Heating
ON
Signals 1 and
OFF
2 of CN3
ON
Compressor
OFF
Time