First Co WH / XH Horizontal Double wall User Manual
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PROCEDURE 8 – AIR FILTER
The air filter should be cleaned or replaced every 30 days or more frequently if severe conditions exist. Always replace the filter
with the same type as originally furnished.
CAUTION:
Never operate unit without a filter or with filter access door removed. Damage to blower motor
or coil can result. Failure to follow this CAUTION could result in personal injury or product and property
damage.
IMPORTANT:
Factory authorized filters must be used when locating the filter inside the unit. For those applications where
access to an internal filter is impractical, a field-supplied filter must be installed in the return duct system
PROCEDURE 8 – UNIT START-UP
DANGER:
Service and maintenance to internal components and wiring must not be performed until the
main disconnect switch is turned off. Failure to do so will result in electrical shock causing personal injury
or death.
Pre-start Check
Check that supply voltage matches nameplate data.
Ensure that the unit is properly grounded.
With power off, ensure that the blower wheel rotates freely and quietly.
Check that the refrigerant or water coil, valves and piping have been leak checked and insulated as required.
Ensure that all air has been vented from the water coils.
Install all panels.
Install any filters which may have been removed during the installation process.
Ensure that the air distribution system external static pressure and the unit cabinet static pressure does not exceed the rated
performance of the motor / pulley combination installed in the air handler.
Before start-up, all of the components should be given a thorough check. Optimal operation of this equipment requires
cleanliness. Often after installation of this equipment additional construction activities occur. Care must be taken to protect the
equipment from debris during these construction phases.
CAUTION:
The fan coil unit should not be energized until the water coils and all water lines have been
purged of air. Failure to follow this CAUTION could result in product and property damage.
WARNING:
The manufacturer does not warrant equipment subjected to abuse. Metal chips, dust, drywall
tape, paint over spray, etc. can void warranties and liability for equipment failure, personal injury and
property damage.
Blower Speed Adjustment
Adjustment of blower speed is made by loosening the set screw in the outer (movable) pulley face and turning this face half or
full turns only, so that the adjusting set screw will be positioned precisely over the flat on the pulley hub. Speed is reduced by
adjusting the pulley faces so that they are further apart; speed is increased with faces closer together. Check all of the pulleys'
set screws for tightness.
When increasing blower speed always check the amperage draw of the motor against the motor nameplate maximum amperage
rating. All doors, ducts, filter, grilles and other components must be in place for this test.
CAUTION:
Leaving air temperature must not exceed 150 degrees. Failure to follow this CAUTION could
result in the motor cutting out on over temperature cutout. At high altitude conditions, the blower motor may
cutout at a lower LAT.
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