Mitsubishi Electric PUMY-P100VHM Technical & Service Manual page 16

4-3-2. Correcting Capacity for Changes in the Length of Refrigerant Piping
(1) During cooling, to obtain the ratio (and the equivalent piping length) of the outdoor units rated capacity and the total
in-use indoor capacity, first find the capacity ratio corresponding to the standard piping length from Figure 3,
and then multiply by the cooling capacity from Figure 1 to obtain the actual capacity.
(2) During heating, to find the equivalent piping length, first find the capacity ratio corresponding to standard piping length
from Figure 3, and then multiply by the heating capacity from Figure 2 to obtain the actual capacity.
(1) Capacity CORRECTION CURVE (Figure 3)
100
95
90
85
80
75
70
5 10 15
(2) Method for Obtaining the Equivalent Piping Length
Equivalent length for type P100·125·140 = (length of piping to farthest indoor unit) + (0.3 o number of bends in the piping) (m)
Length of piping to farthest indoor unit: type P100~P140.....80m
4-3-3. Correction of Heating Capacity for Frost and Defrosting
If heating capacity has been reduced due to frost formation or defrosting, multiply the capacity by the appropriate correction
factor from the following table to obtain the actual heating capacity.
Correction factor diagram
Outdoor Intake temperature (W.B.°C)
Correction factor
20 25 30 35 40
Corrected pipe length
6 4
1.0 0.98
45 50 55 60 65
2 0 -2
0.89 0.88 0.89
16
Heating P100, 125, 140
models
Cooling P100 model
Cooling P125 model
Cooling P140 model
70 75 80
-4 -6 -8
0.9 0.95 0.95
Cooling
Heating
-10
0.95