67
8-4.
Outdoor unit
control
Jumper switching O: Short circuit ×: Open
6-2) Advance defrost operation
When compressor temperature is low, defrosting preliminary operation will be carried out to carry defrosting smoothly in
effect.
1) Start condition of advance defrosting
•TD < 50 ºC and A, B, C or D zone detected.
2) Conditions for changing over from defrosting preliminary operation to defrosting.
• When TD ≥ 50 °C is detected during defrosting preliminary operation.
• When thermostat is turned off during defrosting preliminary operation.
• When defrosting preliminary operation is carried out more than 10 minutes.
3) Control details
• Target SH during defrosting preliminary operation will be 6 to 10 K. (refer to 8-4-1 (See page 62))
• PMV control interval will be shorter than normal.
• Operation frequency will be fixed.
*1. When TD ≥ 50 °C, Advance defrosting will be skipped.
Item Operation flow and applicable data, etc.
J805 J806 [d]
O O 150 min (Factory default)
O × 90 min
× O 60 min
× × 30 min
Advance defrosting
Defrosting operation
*1
Compressor
OFF
40.1 Hz
Outdoor fan
OFF
ON
4-way valve
OFF
On
Outdoor
PMV
430 pulse
500 pulse
0 pulse
Dotted line shows a operating image.
0s
30s
40s
0s
20s
30s
40s
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