Installation guide
I Single Package Air Conditioners Installation Instructions
7. Start-up Procedures
Electrical shock hazard.
Use extreme care during all of the following
checks and procedures.
Make sure electric power is turned OFF as
instructed in appropriate steps.
Failure to follow this warning can result in prop-
erty damage, personal injury, and/or death.
Circulating Air Blower
Determining Blower Speed
1. Turn electric power OFF.
2,
From the system design, determine the external stat-
ic pressure (ESP) for the supply ducts, return ducts
and registers, diffusers, grilles, dampers, heaters
and special filters (if any).
3. To your system ESP determined in Step 2, add 0.05
inches of Water Column for a wet coil and 0.08 inches
of Water Column for the unit filter.
4,
5.
,
From the system design, determine the desired cool-
ing airflow in cubic feet per minute (CFM).
Locate the unit's Blower Performance Data table in
the tech data sheet for the unit's voltage. (The tech
data sheet is attached to the inside of the electrical
access panel and is also published in the Technical
Support Manual.) From the table, determine the
speed tap the desired airflow requires.
See next section, Speed Taps, to set the blower mo-
tor speed terminal block (speed taps) to the cooling
speed determined 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 necessary.
NOTE: The yellow lead MUST always be connected to the
speed tap block at the common quick connect terminal.
The terminal is identified as COM. Also, this is the only lead
which is 3/16" wide. All other quick connects are 1/4" wide.
Cooling Only
Refer to FIGURE 7 on Page13 and the unit's wiring dia-
gram, which is attached to the inside of the electrical ac-
cess panel and is also published in the Technical Support
Manual. Wire the speed tap as required.
Cooling and Heating
If an Electric Heat Accessory is used, see its Installation
Manualfor proper heating speed tap settings. If it has been
determined that cooling and heating speeds are needed on
the same speed tap, remove the red heating lead from the
speed tap block and connect it to the insulated male termi-
nal on the black cooling lead. Then place the insulated
black female quick connect to the required speed tap.
Check Before Starting
1,
2,
Check that the blower motor speed terminal block is
set to the proper cooling speed. Refer to the unit wir-
ing diagram and the various airflow tables in the
Technical Support Manual.
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
instructions. If any unusual sparking, odors or noises are
encountered, shut OFF electric power immediately. Re-
check for wiring errors or obstructions in or near blower mo-
tors.
Reverse Rotation (Scroll Compressors
Only)
Three phase scroll compressors CAN run in reverse if im-
properly wired. Ifthe compressor makes an unusually loud
noise, or if high and low side pressures are nearly identical,
this indicates reverse rotation. To correct, reverse any two
wires at line voltage connections ONLY. Do NOT rewire
any circuits inside the unit to attempt correction of reverse
rotation.
Circulating Air Blower
1. Be sure electric power is OFF.
2. Set thermostat Heat-Cool selector to OFF.
3. Set thermostat fan switch to AUTO.
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