Sanyo DHX4852 - Manual (Page 28)

2-18
Design of W-2WAY ECO-i SYSTEM Unit Specifications
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Indoor unit changes
The indoor unit in room 4, where the corrected indoor unit capacity is less than the maximum load, is increased by one rank.
Outdoor unit
Room 1
(indoor unit 1) Room 2
(indoor unit 2) Room 3
(indoor unit 3) Room 4
(indoor unit 4)
Selected model Type 14053+09053 Type 4852 Type 4852 Type 3652 Type 2452
Maximum load
(cooling/heating) (BTU/h)
40,000 / 46,000 40,000 / 46,000 30,000 / 35,000 18,000 / 23,000
Rated capacity
(cooling/heating) (BTU/h)
249,100 / 278,100 47,800 / 54,600 47,800 / 54,600 36,000 / 39,000 25,000 / 27,000
(5) Corrected capacity
(cooling/heating) (BTU/h)
208,100 / 201,900 47,400 / 54,600 46,300 / 54,600 34,000 / 38,900 23,000 / 26,400
(7) Actual capacity
(cooling/heating) (BTU/h)
47,400 / 54,600 46,300 / 54,600 34,000 / 38,900 23,000 / 26,400
Total corrected capacity of all indoor units (cooling/heating) = 150,700/174,500
Ruc = 150,700/208,100 = 0.724 < 1 Ruh = 174,500/201,900 = 0.864 < 1
For both cooling and heating in all rooms, actual capacity is now greater than or equal to the maximum load. Selection is
completed.
(2) Calculate the final selection results according to the capacity calculation procedure.
[From calculation of the correction coefficient to calculation of actual capacity] (Cooling/heating)
Outdoor unit
Room 1
(indoor unit 1) Room 2
(indoor unit 2) Room 3
(indoor unit 3) Room 4
(indoor unit 4)
Rated capacity (BTU/h) 249,100 / 278,100 47,800 / 54,600 47,800 / 54,600 36,000 / 39,000 25,000 / 27,000
Correction coefficient
(1) Model 1.00 / 1.00
(2) Temp. condition 1.020 / 0.937 0.921 / 0.780 0.921 / 0.980 0.921 / 0.980 0.921 / 0.980
(3) Tubing length,
elevation difference
0.819 / 0.871 1.077 / 1.052 1.052 / 1.035 1.026 / 1.017 1.00 / 1.00
(4) Frosting/defrosting 0.89
Result of (2) × (3) 0.992 / 1.031 0.969 / 1.014 0.945 / 0.997 0.921 / 0.980
Correction coefficient
applied to indoor unit *1
0.99 / 1.03 0.97 / 1.01 0.95 / 1.00 0.92 / 0.98
(5) Corrected capacity (BTU/h) *2 208,100 / 201,900 47,400 / 54,600 46,300 / 54,600 34,000 / 38,900 23,000 / 26,400
(6) Correction coefficient
for corrected capacity ratio
1.00 / 1.00
(7) Actual capacity (BTU/h) 47,400 / 54,600 46,300 / 54,600 34,000 / 38,900 23,000 / 26,400
*1: This varies depending on the values of (2) and (2) × (Distribution ratio in (3)).
*2: Corrected outdoor unit capacity = Rated outdoor unit capacity Ч (1) Ч (2) Ч (3) Ч (4)
The actual capacity is calculated as shown below.
Cooling: Ruc = (47,400 + 46,300 + 34,000 + 23,000) / 208,100 = 0.724 < 1
Therefore,
Actual cooling capacity of each indoor unit = Corrected cooling capacity of each indoor unit
(In other words, the correction coefficient (6) for the corrected capacity ratio is 1.)
Heating: Ruh = (54,600 + 54,600 + 38,900 + 26,400) / 201,900 = 0.864 < 1
Therefore,
Actual heating capacity of each indoor unit = Corrected heating capacity of each indoor unit Ч (0.1 Ч Ruh + 0.9) / Ruh
(In other words, the correction coefficient (6) for the corrected capacity ratio is (0.1 × Ruh + 0.9) / Ruh.)
2. System Design
TD831138-02_W-2WAY.indb 18 2007/07/26 14:30:42