Correction At Frosting And Defrosting; (Cooling) (Heating) - Mitsubishi Electric PFAV-P250VM-E Data Book

(2) Correction at frosting and defrosting

• Table of correction factor at frosting and defrosting
Outdoor temp. ˚CWB
PUHY-P250YHM-A
PUHY-P500YSHM-A
PUHY-P750YSHM-A
(3) Correction by refrigerant piping length
• P250,P300-E-F
• Cooling
1.00
0.95
0.90
0.85
0.80
0.75
0.70
0.65
0 20 40
• Heating
1.00
0.98
0.96
0.94
0.92
0.90
0 20 40
• How to obtain piping equivalent length
Equivalent length = (Actual piping length to the indoor unit)
+ (0.42 number of bent on the piping) m
• P750,P900-E-F
• Cooling
1.00
0.95
0.90
0.85
0.80
0.75
0.70
0.65
0 20 40
• Heating
1.00
0.98
0.96
0.94
0.92
0.90
0 20 40
• How to obtain piping equivalent length
Equivalent length = (Actual piping length to the indoor unit)
+ (0.7 number of bent on the piping) m
6 4 2 1
1.00 0.95 0.84 0.83
1.00 0.98 0.89 0.86
1.00 0.98 0.89 0.88
60 80 100 120 140 160
Piping equivalent length (m)
60 80 100 120 140 160
Piping equivalent length (m)
60 80 100 120 140 160
Piping equivalent length (m)
60 80 100 120 140 160
Piping equivalent length (m)
0 -2 -4
0.83 0.87 0.90
0.89 0.90 0.92
0.89 0.90 0.92
• P500,P600-E-F
• Cooling
1.00
0.95
0.90
0.85
0.80
0.75
0.70
0.65
180
• Heating
1.00
0.98
0.96
0.94
0.92
0.90
180
• How to obtain piping equivalent length
Equivalent length = (Actual piping length to the indoor unit)
180
180
54
-6 -8 -10 -20
0.95 0.95 0.95 0.95
0.95 0.95 0.95 0.95
0.95 0.95 0.95 0.95
0 20 40 60 80 100 120
Piping equivalent length (m)
0 20 40 60 80 100 120
Piping equivalent length (m)
+ (0.5 number of bent on the piping) m
140 160 180
140 160 180