Modular Blower Installation Instructions /
Air Flow Check
Temperature Rise Check
For proper system operation, the air flow through the indoor coil
should be between 350 and 450 cfm per ton of cooling capacity.
The air flow through the unit can be determined by measuring the
external static pressure to the unit and selecting the motor speed
tap that will most closely provide the required air flow.
1. Set up to measure external static pressure at the supply
and return duct connections (Figure 9).
2. Drill holes in the ducts for pressure taps, pitot tubes, or
other accurate pressure sensing devices.
Figule 9 I
Static Pressure Check
SupplYr___._
Temperature rise is the difference between the supply and return
air temperatures.
NOTE: The temperature rise can be adjusted by changing the
heating speed tap at the unit's blower terminal block.
A temperature rice greater than 60 OF (33.3 °C) is not
recommended.
1. To check the temperature rise through the unit, place
thermometers in the supply and return air ducts as close to
the unit as possible.
2. Open ALL registers and duct dampers.
3. Set thermostat Heat-Cool selector to HEAT.
4. Set the thermostat temperature setting as high as it will go.
5. Turn electric power ON.
6. Operate unit AT LEAST 5 minutes, then check
temperature rise.
NOTE: The maximum outlet air temperature for all models
is 200 OF (93.3 °C).
7. Set thermostat to normal temperature setting.
8. Turn electric power OFF.
9. Be sure to seal all holes in ducts if any were created during
this process.
Maintenance
Filters
3. Connect these taps to a level inclined manometer or draft
gauge.
4. Ensure the coil and filter are clean, and all the registers are
open.
5. Determine the external static pressure with the blower
operating.
6. Refer to the Air Flow Data tables, page 8 to find the Dip
Switch Speed setting that will most closely provide the
required air flow for the system.
7. Refer to Motor Speeds and Airflow in these instructions if
the speed is to be changed.
8. Recheck the external static pressure with the new setting,
and confirm speed switch selection.
External filters must be supplied for the system. Filters must be
cleaned 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.
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.
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