Manual
7. Start-up Procedures
Electrical shock hazard.
Use extreme care during all of the following checks and pro-
cedures.
Make sure electric power is turned OFF as instructed in ap-
propriate steps.
Failure to follow this warning can result in property damage,
personal injury, and/or death.
Final Electrical Check
Make a final wiring check to be sure system is correctly wired. In-
spect field installed wiring and the routing to ensure that rubbing
or chafing due to vibration will not occur.
NOTE: Wiring MUST be installed so it is protected from possible
mechanical damage.
Circulating Air Blower
Determining Blower Speed
1. Turn electric power OFF.
2. From the system design, determine the total external static
pressure (ESP) for the supply ducts, return ducts and regis-
ters, diffusers, grilles, dampers, heaters and filters.
3. To your system ESP determined in Step 2, add 0.05 In. W.C.
for a wet coi!.
4. From the system design, determine the desired cooling air-
flow in cubic feet per minute (CFM).
5. Locate the unit's Blower Performance Data table on the tech
data label for the unit's voltage. (The tech data sheet is at-
tached to the evaporator access panel on the unit.) From the
table, determine the speed tap required to achieve the de-
sired airflow.
6. See next section, Speed Taps, to set the blower motor
speed terminal block (speed taps) to the cooling speed deter-
mined in the previous steps.
Speed Taps
After determining the required CFM and speed tap data from the
tech data sheet, follow the steps below to change speeds if nec-
essary.
FIGURE i4 [ Blower Speed Tap Settings
10 SEER 3 TON LOW
10 SEER 4 TON LOW
10 SEER 5TON HI
NOTE: The speed taps that the manufacture sets from the factory
for this product are based on a nominal 400 CFM per ton cooling
and the basic mid range on the temperature rise for heating. Since
the manufacturer cannot establish the static pressure that will be
applied to the unit, it is the responsibility of the installing dealer /
contractor to select the proper speed taps for the application
when the unit is installed.
IO.ow.,MotorSpeedTaps
Blower Speed Tap Block
Auxiliary Electric Heat B
Wire (if used)
connects here
BE SURE TO CHECK BLOWER MOTOR SPEED DATA ON THE
UNITS TECHNICAL DATA LABEL LOCATED ON THE UNIT.
NOTE: Electric heater blower wire may be attached to any "Ap-
propriate" speed tap See FIGURE 11 note8. The yellow lead
MUST always be connected to the speed tap block at the com-
mon quick connect terminal. The terminal is identified as COM.
Refer to FIGURE 15 and the appropriate unit wiring diagram in-
cluded in this manual. Wire the black wire to the required speed
tap terminal to achieve required airflow determined in Step 5.
Cooling and Auxiliary Electric Strip Heat
On Air Conditioning units with electric heat, the heat strip may be
operated on a lower blower speed than cooling (Refer to Heater
Chart FIGURE 11) See FIGURE 15 for connection location.
Check Before Starting
1. Check that the blower motor speed terminal block is set to
the proper cooling speed. Refer to the unit wiring diagram
and the various airflow tables in this manual.
2. Check to see that clean, properly sized field supplied air
filters are installed in the return air duct.
3. Inspect the inside of the unit to be sure that all wires are in
place and all tools, etc. are removed.
4. Replace all service access panels.
Check the unit's operation as outlined in the following instruc-
tions. If any unusual sparking, odors or noises are encountered,
shut OFF electric power immediately. Recheck for wiring errors,
or obstructions in or near blower motors.
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