4-29
OPTIONAL FUNCTION
(4.3 Outdoor Unit)
4.3.5 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
Table 4.6 Specifications of Required Main Parts
NOTES:
1. Make the wire to the terminals as short as possible.
2. Do not run the wires along high voltage cable. (crossing is applicable.)
If necessary to run wires along high voltage cable, insert the low voltage cable(s) into metal tube
and ground it at one end. If sealed wires are used at the low voltage wire side, ground it at one
end of shield wires. The maximum length should be 70m.
Specifications Remarks
Auxiliary Relay (X1, X2)
Mini-Power Relay, MY1F (or 2F) made
by OMRON
220/240V
Changeover Switch (SS2, SS3) Manual Switch 220/240V
3 Pin Connector PCC-1A Five Cords with
Cord (Connected to JST Connector, XARP-3) Connectors as One Set
Cord Low Volt.
0.3mm
2
lower than 24V
(Inside of Unit) 220/240V
0.5 to 0.75mm
2
Cord Low Volt.
0.5 to 0.75mm
2
lower than 24V
(Outside of Unit) 220/240V
2mm
2
Parts
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