Correction At Frost And Defrost - Mitsubishi Electric PURY-WP-YJM-A Data Book

6. CAPACITY TABLES
6-3-3. How to obtain the equivalent piping length
Refrigerant pipe
1. PURY-WP200YJM-A
Equivalent length = (Actual piping length to the farthest indoor unit) + (0.35 × number of bends in the piping) [m]
2. PURY-WP250YJM-A
Equivalent length = (Actual piping length to the farthest indoor unit) + (0.42 × number of bends in the piping) [m]
Water pipe
3. PURY-WP200, 250YJM-A
Equivalent length = (Actual piping length to the farthest indoor unit) + (0.55 × number of bends in the piping) [m]
Water piping design
HBC water pipe connection sizes and pipe sizes.
Indoor unit
PEFY-WP-VMA
To outdoor unit
Note:
*1. Connection of multiple indoor units with one connection (or joint pipe)
• Total capacity of connectable indoor units: Less than 80
• Number of connectable indoor units: Maximum 3 Sets
• Selection of water piping
Select the size according to the total capacity of indoor units to be installed downstream.
• Please group units that operate on 1 branch.

6-4. Correction at frost and defrost

Due to frost at the outdoor heat exchanger and the automatic defrost operation, the heating capacity of the outdoor unit can be
calculated by multiplying the correction factor shown in the table below.
Table of correction factor at frost and defrost
Outdoor inlet air temp. °C
Outdoor inlet air temp. °F
PURY-WP200YJM-A
PURY-WP250YJM-A
Connection size
Water inlet Water outlet
Rc 3/4 screw Rc 3/4 screw
End connection (brazing)
HBC controller
Water pipework is screw
connections
Indoor Indoor Indoor
unit unit unit
6 4 2
43 39 36
1.00 0.98 0.89
1.00 0.98 0.89
OUTDOOR UNITS
Pipe size
Water out Water return
I.D.20mm I.D.20mm
Twinning pipe (field supply)
Indoor Indoor
unit unit
*1
Up to three units for 1 branch hole;
total capacity: below 80
(but in same mode, cooling/heating)
1 0 -2 -4
34 32 28 25
0.88 0.89 0.90 0.92
0.88 0.89 0.90 0.92
Indoor
unit
-6 -8 -10 -20
21 18 14
0.95 0.95 0.95 0.95
0.95 0.95 0.95 0.95
2 - 15
-4