Low Pressure Protection Control - Daikin ZQG71~140L7V1B Service Manual

ESIE12-06
3.2.10 Night-time Quiet Operation
A. Setting by Remote Controller
B. Setting by Demand Operation (Option)
Note: In the case of capacity priority setting
Setting the "Capacity priority setting" from the field setting mode of indoor remote controller, the
capacity is prioritized in the operations of both A and B, and when the air conditioning load
becomes high, the low noise operation stops and the normal operation starts.
If you cancel the capacity priority setting when the low noise setting remains, the low noise
setting is prioritized, and even if air conditioning load becomes high, the noise operation
continues.

3.2.11 Low Pressure Protection Control

In order to prevent abnormal low pressures in the system, the below control function will be
activated.
Lp < 0.12 MPa
10 times or less
stopping in 200 minutes
Function and Control
Night-time quiet operation can be set by field setting from the wired remote controller.
By estimating current time based on the change of outdoor air temperature, the low noise
operation is automatically performed at night (from 22:00 to 8:00) by limiting the number of
revolutions of outdoor unit fan and the operation frequency of the compressor. (The time at
night is target.)
Short circuit between COM-LNOP on terminal of demand adaptor.
Low sound running to be done with limited outdoor fan speed compressor running
frequency.
(Cooling)
Normal operation
• Lp > 0.15 MPa
&
• 30 sec elapsed
Compressor upper limit frequency
RZQG71L: 57 Hz
RZQG100-140L: 30 Hz
• Lp < 0.12 MPa continues
for 5 minutes
Stopped 11 times in 200 minutes
• Within 10 minutes after
• OR
defrosting
• From the starting to
&
within 5 minutes after
the startup control stops
• Lp < 0.12 MPa
Compressor upper limit frequency
• Lp < 0.12 MPa continues
for 10 seconds
Compressor upper limit frequency
• Lp < 0.12 MPa continues
for 1 minute
Compressor upper limit frequency
RZQG100-140L: 30 Hz
Compressor stop: 0 Hz
Abnormal stop (E4 indication)
Condition E* : OR
Function Details
(Heating)
Normal operation
• Lp > 0.15 MPa continues
for 1 minute
20 steps
• Lp > 0.15 MPa continues
for 10 seconds elapsed
10 steps
Lp > 0.15 MPa
RZQG71L: 57 Hz
• 5 minutes after starting
• 10 minutes elapsed after
• &
defrosting
• Lp > 0.15 MPa continues for 1 minute
Condition E
Condition E
Condition E
57