JOHNSON CONTROLS
96
FORM 145.05-NOM7
ISSUE DATE: 10/31/2019
SECTION 4 – MAINTENANCE
12. Reinstall the condenser access panel.
13. Return the unit to normal operation.
Waterside Economizer Coil Cleaning
The following procedure should be used to clean the
waterside economizer coil if required.
1. Shut down the unit.
2. Utilize the appropriate lock out tag out procedure.
3. Open the low point external drain to remove water
from the condenser.
4. Open the compressor compartment door.
5. Remove the coil clean out plugs.
6. Clean the tubes with a cable type tube cleaner.
The tubes are 1/2" OD.
Use a back up wrench on the condenser
tube while removing the clean out plug
to prevent damage to the condenser tube.
7. Inspect the O-ring gasket on the clean out plugs.
Replace any that shows signs of damage or per-
manent set.
8. Reinstall the condenser clean out plugs using a
back up wrench.
9. Rell the waterside of the condenser and purge
the air.
10. Open the shut off isolation valves.
11. Inspect the waterside coil clean-out plug for leaks.
12. Return the unit to normal operation.
On the mechanical cleanable coils, each
of the tubes has a clean out plug that is
sealed with an O-ring. The specication
of the O-ring is 11/15-inch OD with a 3/32
-inch width made from EPDM material.
Use McMaster Part Number 9557K473
or equivalent.
Do not over tighten.
WATER PRESSURE DROP TABLES
TABLE 16 - CONDENSER WATER PRESSURE DROP (LSW_025–040), FEET OF W.C.
WATER FLOW
GPM
CONDENSER
ALL MODELS
ADDITIONAL WATERSIDE ECONOMIZER - WHEN ACTIVE
LSW_025 LSW_032 LSW_035 LSW_040
50 4.93 2.30 2.08 2.00 2.00
60 6.77 3.19 2.87 2.77 2.77
70 8.86 4.20 3.78 3.63 3.63
80 11.18 5.33 4.79 4.60 4.60
90 13.73 6.58 5.90 5.67 5.67
100 16.49 7.95 7.12 6.84 6.84
110 19.47 9.43 8.43 8.10 8.10
120 22.66 11.02 9.84 9.45 9.45
130 26.06 12.72 11.34 10.89 10.89
140 29.65 14.52 12.94 12.42 12.42
150 33.44 16.44 14.63 14.03 14.03
160 37.43 18.45 16.41 15.74 15.74
NOTES: 1 foot water (60.0°F) (ftAq) = 0.43 Psi (Psi)
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