Functions; Defrost Detection And End - Sanyo SAP-CMRV3143GJH Technical & Service Manual

8. FUNCTIONS

8-1. Defrost Detection and End

8-1-1. Non-stop defrosting
Defrost sequence
HEAT operation
Frost detection
Non-stop defrost operation
Defrost end
NOTE: • Defrost does not occur during HIGH POWER operation.
If other stopped indoor units are started during defrost operation, they begin operating in
defrost mode.
8-1-2. Clean defrost
If all indoor units are stopped during HEAT operation, and frost is detected at the L2 line, and the
conditions for defrost are met, then defrost operation occurs, and the unit stops after defrost is completed.
4-way valve ON
Defrost detection occurs in either of the following cases:
• The temperature of the heat exchanger remains at or below
the L1 line for 35 minutes after the start of HEAT operation.
• The temperature of the heat exchanger remains at or below
the L2 line for 120 minutes after the start of HEAT operation.
exchanger temperature
L2
L1
• Compressor
• Outdoor fan
• Solenoid valve
(for hot gas bypass)
• Indoor fan
• Temperature of the outdoor heat exchanger is at or above the
temperature shown in the table below.
• Defrost operation has continued for 12 minutes (max. length).
End temperature
Defrost operation time
Coil temperature for
ending defrost
*
1 The temperature for ending defrost is 7°C or higher when the outdoor air
temperature is less than 0°C.
17
Outdoor heat
–13 0
Outdoor air
temperature
– 8
– 9
–15
–21
→ 100 Hz operation (4-way valve ON)
→ OFF
→ ON
→ OFF
Less than 2 minutes 2 minutes or more
*
Not ended 1 10°C or higher