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42 Ceiling & Floor, Ceiling Suspended (50Hz, R22)
9. Selection Procedure
Step 1. Determine cooling load requirements at design conditions.
Required load conditions:
Required cooling capacity (TC)...................................25,000 Btu/h
Sensible capacity (SHC) ............................................19,000 Btu/h
Temperature air entering Outdoor Unit.......................95°F
Temperature air entering Indoor Unit .........................80°F DB/67°F WB
DB — dry bulb temperature
WB — wet bulb temperature
Step 2. Select unit based on required cooling capacity.
Based on Total Cooling Capacity, choose suitable model from the specification table.
The model with a nominal net capacity of 28,000 Btu/h cooling is selected.
The system consists of a LV-B2860CL.
Verify the unit performance at the given conditions in accordance with step #3.
Step 3. Determine if system selected satisfies cooling requirements.
Enter cooling capacities table on page 44 at high speed and 95°F outdoor entering air temperature with
80°F DB/67°F WB indoor entering air temperature.
Total cooling capacity = 28,000 Btu/h, Sensible capacity=21,600 Btu/h
To find capacity at intermediate conditions not in the table ;
Interpolation should be used when design conditions are between two numbers that are in the capacity
table.
Extra-polation is not recommended.
If the interconnecting piping length is more than 7.5m ;
Find the capacity(%) at that particular interconnecting piping length from the coefficient of capacity change
graph, on page 51.
Multiply coeffienct factor with Total Cooling Capacity & Sensible Capacity.
Ex: At 20m interconnecting piping length, from coefficient of capacity change graph, coeffienct factor is
0.94.
Total Cooling Capacity =
Capacity (%) x Total Cooling Capacity
=
94x28000
=26,320Btu/h
100 100
Sensible Capacity =
Capacity (%) x Sensible Capacity
=
94x21600
=20,304Btu/h
100 100