3 Electrical and control settings
Unit electrical wiring and connection
SMGB0137 rev.0 - 05/2021
55
3
Test runs
!
C A U T I O N
• Be careful during the test runs, as some of the safety functions remain disabled: the units operate for two hours without switching off
via the thermostat. The three-minute compressor protection is not enabled during the test.
•
Secure the rubber bushes to the panel using adhesive when the outdoor unit ducts are not used.
•
The compressor remains at a standstill during forced stoppage.
3.1.10 Econofresh electrical wiring connection
The electrical wiring connection for the unit is shown below.
Mount the outdoor thermistor at a position near the outdoor
air inlet.
Pay attention to the position of the thermistor where the
direct sunshine is not radiated or rain water is not touched.
RPI PCB
Connector
AS
Motor
Econofresh Kit
Outdoor
Thermistor
Enthalpy Sensor
Gas Sensor
!
D A N G E R
• Turn OFF the main power switch to the unit and wait for more than 3 minutes before electrical wiring work or a periodical
check is performed.
• Check to ensure that the indoor unit’s fan has stopped before electrical wiring work or a periodical check is performed.
• Protect the wires, electrical parts, etc. from rats or other small animals. If not protected, rats may gnaw at unprotected parts
and at the worst, a fire will occur.
!
C A U T I O N
Wrap the accessory packing around the wires, and plug the wiring connection hole with the seal material to protect the products from any
condensate water or insects.
Optional sensor connection
When installing the field-supplied sensors, select and connect the sensors as follows.
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The type of the sensor should be of ON/OFF switching type.
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The switch rating should be DC12V.
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Connect the wires to #1 and #2 of CN3 on the RPI PCB. (In this case, the enthalpy sensor cannot be applied).
-
Lead the wires through the connecting hole for the control circuit.
RPI PCB
CN3
2
1
Optional Sensor (DC12V, 1 to 2mA)
1 Enthalpy Sensor (Field-Supplied)
-
The switching arrangement should be as follows.
OFF: for Calling Free Cooling (Compressor OFF)
ON: for Calling Mechanical Cooling (Compressor ON)
-
Set the enthalpy sensor mode by using remote control switch.
2 CO
2
Gas Sensor (Field-Supplied)
-
The switch arrangement should be as follows.
ON: for Increasing Outdoor Air Introduction
OFF: for Decreasing Outdoor Air Introduction
-
Set the CO
2
Gas sensor mode by using remote control switch.
