Johnson Controls LSWU035 Engineering Guide

FORM 145.05-EG2 (618)
JOHNSON CONTROLS
15
Selection Procedure
1. Design Criteria should be available to select a unit. These criteria include:
a. Design airflow
b. Entering air conditions
• Summer
• Winter (if heating is required)
c. Total and sensible loads
d. Condenser water entering and leaving temperatures
e. External static pressure
f. Factory installed options required
2. Based on design air ow, select the smallest unit with maximum air ow higher than
design air ow and minimum airow lower than design air ow from Unit Physical
Data Tables on page 19 through page 21. Please note that standard and high ef-
ciency units of the same size have different air ow limits.
3. Divide the design air ow by the air ow indicated at the top of the appropriate Cool-
ing Performance Table for the selected unit and efciency, on page 22 through
page 31. Use Table 2 on page 17 to determine the correction factors for total and
sensible capacities and compressor power.
4. Multiply the total and sensible capacities and compressor power from appropriate
Cooling Performance Table for design air and water conditions with the correction
factors above to determine the unit capacity adjusted for the airow.
5. Determine if the cooling performance of this unit is acceptable. If not, repeat steps 2
through 4 above with a higher capacity unit.
6. If waterside economizer option is chosen, follow steps 3 and 4 above with appropri-
ate Waterside Economizer Cooling Performance Table on page 32.
7. If hot water heating option is required, follow steps 3 and 4 with appropriate Hot
Water data from Physical Data tables on page 19–20.
8. If electric heat option is required, obtain heating capacity based on electric heat ca-
pacity and unit voltage from Electric Heat Capacity Table on page 68.
9. Select ltration types and efciencies needed with corresponding air pressure drop
from Table 30 on page 69 and Table 31 on page 70.
10. Select either airside economizer or inlet sound attenuating plenum, if required, with
corresponding air pressure drop from Table 19 and Table 20 on page 57.
11. Select half or full outlet plenum, if required, with corresponding air pressure drop
from Table 19 and Table 20 on page 57.
12. With all options selected, add air pressure drops of all the components selected, in-
cluding evaporator coil, to external static pressure required to determine total static
pressure required for the supply air fan.

Johnson Controls LSWU035 Specifications

General

Brand	Johnson Controls
Model	LSWU035
Category	Chiller
Language	English