Daikin RZQG71~140L7V1B Service Manual page 126

ESIE12-06
Defrost Control
Model
RZQG71L
RZQG100-140L
Defrost Ending Conditions
Defrosting ends when the following conditions have been realized. Note that defrosting can be
operated for 10 minutes at longest.
Hp: High pressure
Tb: Heat exchanger distributor pipe temperature
Tm: Intermediate heat exchanger temperature
3.2.27 Outdoor Unit Fan Control when Frost is Adhered
During heating, when frost has adhered to the outdoor unit heat exchanger and the ventilation
flue is blocked, the fan sound increases.
To prevent this fan noise from increasing, the number of revolutions of fan is lowered.
3.2.28 Emergency Operation
• No transmission is performed between indoor and outdoor unit.
• During cooling, the cycle of operation for 20 minutes and stop for 10 minutes is repeated.
• During heating, defrost is performed once every one hour.
• Under other conditions, the same control as the normal control is performed.
Function and Control
Compressor
Four way valve
Electronic
expansion valve
Outdoor unit fan
Indoor unit fan
Defrost Time
&
Hp 2.45 MPa
Defrost Time
OR
&
Tb 10°C
Tm 12°C
Defrost Time
&
Tb 8°C
Tm 10°C
Defrosting start
previous control
A Hz
ON
OFF
150
480 pls
pls
(wet protection control)
0 pls (5~60 sec.)
ON
OFF
ON
OFF
10 sec.
1 min.
9 min.
Function Details
Defrosting complete
0 Hz
ON
0 pls (5 sec.)
ON
ON
A
Step 25
Step 20
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