5169034-UIM-B-0216
14
Johnson Controls Unitary Products
SECTION X: MAINTENANCE
Filters must be cleaned or replaced when they become dirty. Inspect at
least once per month. The frequency of cleaning depends upon the
hours of operation and the local atmospheric conditions. Clean filters
keep unit efficiency high.
COIL CLEANING
If the coil needs to be cleaned, it should be cleaned with water.
LUBRICATION
The bearings of the blower motor are permanently lubricated.
CONDENSATE DRAINS
During the cooling season check the condensate drain lines to be sure
that condensate is flowing from the primary drain but not from the
secondary drain. If condensate ever flows from the secondary drain the
unit should be promptly shut off and the condensate pan and drains
cleaned to insure a free flowing primary drain.
SECTION XI: AIR SYSTEM ADJUSTMENT
To check the Cubic Feet per Minute (CFM), measure the static
pressure drop across the air handler using a manometer and static
pressure tips. To prepare coil for static pressure drop measurements
run the fan only to assure a dry coil.
Drill 2 holes, one 12” away from the air handler in the supply air duct
and on 12” away from the air handler in the return air duct (before any
elbows in the duct work). Insert the pressure tips and read the pressure
drop from the manometer. See Table 9 to determine the air flow, and
make the necessary adjustments to keep the CFM within the airflow
limitations of the coil.
EXTERNAL DUCT STATIC
Measure the supply air static pressure. Record this positive number.
Measure the return air static pressure. Record this negative number.
Treat the negative number as a positive, and add the two numbers to-
gether. This is total system static. If a filter rack is installed on the return
air end of the air handler or indoor coil section, the return air duct static
must be measured between the filter and the indoor coil.
SECTION XII: TYPICAL THERMOSTAT CONNECTIONS
NOTICE
Refer to Table 9 for coil Air Flow Data of Cubic Feet Per Minute
(CFM). Run the fan on the highest speed to be used.
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FIGURE 11:
Typical Thermostat Wiring Diagram - ECM
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