Panasonic Urban Multi MX1R Series Service Manual page 459

Using r-407c / r-22
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Outline of Control
3.1.12
High Pressure Protection Control
The following control is provided for the compressor operating frequency and others to prevent protection
devices from malfunctioning due to abnormal increase of high pressure (HP) and to protect the
compressors.
[Cooling mode]
OR
[Heating mode]
Condition (1)
OR
Condition (2) (During soft start)
OR
Condition (3)
Condition (4)
438
HP ≥ 2.55 MPa
1 step down for upper limit
Normal
compressor operation frequency
operation
*Judge every 10 sec, and down
1 step until HP<2.55 MPa
• Heating operation
• Compressor stop
• Upper limit frequency
becomes maximum
1 step increase for compressor
operation frequency
Indoor unit thermostat ON capacity of 8.0 kW (3HP) or less
Ta ≥ 15°C
&
HP ≥ 2.16MPa
&
OR
Ta < 15°C
&
HP ≥ 2.25MPa
HP≥2.37MPa
Indoor unit thermostat ON capacity of 8.0 kW (3HP) or less
Ta≥15°C
&
OR
Ta < 15°C
&
HP ≥ 2.26MPa
HP≥2.37MPa
HP < 1.70MPa
Continues for 300 sec
OR
HP < 1.54MPa
&
5 min elapsed after compressor startup
5 min elapsed after defrost completion
5 min elapsed after oil return completion
HP > 2.37MPa
&
5 min elapsed after defrost completion
5 min elapsed after oil return completion
Retry
HP ≥ 2.81 MPa
HP < 2.26 MPa
&
HP < 2.55 MPa
Continues 30 sec.
Function UM Combination "MA1R Series" Using R-407C
PACD011001C2
HP > 3.09 MPa
Forced
E3 normal
thermostat OFF
stop
Up to 2 times
within 30 min
HP < 2.50 MPa
&
OR
Continues 5 min.
(V0823)

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