Correction At Frost And Defrost - Mitsubishi Electric CITY MULTI PEFY-P22VMS-E-S Data Book

6. CAPACITY TABLES
6-3-2. Heating capacity correction
PUMY-P100,125,140YHMC-C/VHMC-S
1
0.95
0.90
0.85
0.80
0.75
0.70
0.65
0 10 20 30
Piping equivalent length (m)
6-3-3. How to obtain the equivalent piping length
1. PUMY-P100, 125, 140YHMC-C/VHMC-S
Equivalent length = (Actual piping length to the farthest indoor unit) + (0.30 x number of bends on the piping) m
2. PUMY-P200, 250YKMC-C
Equivalent length = (Actual piping length to the farthest indoor unit) + (0.30 x number of bends on the piping) m

6-4. Correction at frost and defrost

Due to frost at the outdoor heat exchanger and the automatical defrosting operation, the heating capacity of the outdoor unit should
be considered by multiplying the correction factor which shown in the table below.
Table of correction factor at frosting and defrosting
Outdoor inlet air temp. °C
Outdoor inlet air temp. °F
PUMY-P100, 125, 140YHMC-C
PUMY-P100, 125, 140VHMC-S
PUMY-P200, 250YKMC-C
40 50 60 70 80
6 4 2
43 39 36
1.0 0.98 0.855
1.0 0.98 0.855
1.0 0.98 0.89
OUTDOOR UNITS
PUMY-P200,250YKMC-C
1
0.95
0.90
0.85
0.80
0.75
0.70
0.65
0 10 20
Piping equivalent length (m)
1 0 -2 -4
34 32 28 25
0.85 0.845 0.89 0.90
0.85 0.845 0.89 0.90
0.88 0.88 0.89 0.90
30 40 50 60 70 80
-6 -8 -10
21 18 14
0.95 0.95 0.95
0.95 0.95 0.95
0.95 0.95 0.95
C7-R Rev.
-20
-4
-
-
0.95
2 - 24