Panasonic Urban Multi MX1R Series Service Manual page 56

PACD011001C2
Operation Contents
Upper Limit Frequency
Limited to 38Hz + ON
Function Urban Multi "MX1, ME1 Series" Using R-22
Step 1 → Discharge defrost
Compressor
1 Minute
Elapses EEV
Preparation
for Defrost
Outdoor Unit Fan
Outdoor Unit Heat Exchanger
4 Way Valve
(VF015)
Injection 1
Injection 2
Hot Gas
Step 2 → Suction defrost
Compressor
EEV
Outdoor Unit Fan
Outdoor Unit Heat Exchanger
4 Way Valve
Injection 1
Injection 2
Hot Gas
Step 3 → HR solenoid valve changeover
Compressor
EEV
Outdoor Unit Fan
Outdoor Unit Heat Exchanger
4 Way Valve
Injection 1
Injection 2
Hot Gas
Step 4 → Refrigerant is discharged from accumulator
Compressor
EEV
Outdoor Unit Fan
Outdoor Unit Heat Exchanger
4 Way Valve
Injection 1
Injection 2
Hot Gas
86Hz + OFF
2000pls
OFF + OFF
Condenser
Td Protection Control
3 Minutes Elapsed
86Hz + ON
2000pls
OFF + OFF
Condenser
Td Protection Control
Td Protection Control
Conclusion of Defrost Completion
Condition
 All of R2-1T, R2-2T ≥ 12.5ºC
or 
Pc > 20.5k

10 Minutes Elapsed Since

Defrost Operation Start
38Hz + OFF
2000pls
OFF + OFF
Condenser
Td Protection Control
40 Seconds Elapsed
76Hz + OFF
Limit of EV Opening
H + ON
Evaporator
Td Protection Control
Low Pressure Protection Control

5 Minutes Elapsed
or 
Pc > 14k

R5T > Te + 10ºC
Normal Control
∗Pc = Condensing Pressure
Function
k = kg/cm²
OFF
OFF
ON
OFF
ON
OFF
OFF
ON
ON
OFF
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