First Co WH / XH Horizontal Double wall - Manual (Page 8)

CARE AND MAINTENANCE
For continuing high performance, and to minimize possible equipment failure, it is essential that periodic maintenance be
performed on this equipment. For a current copy of the detailed Maintenance Program, log on to www.firstco.com and look
under “Product Information”.
DANGER: Disconnect all power to unit before servicing. The disconnect (when used) does not disconnect
power to the line side of the disconnect, but does allow safe service to all other parts of the unit. If the unit
does not have a disconnect, disregard the foregoing. Instead, make sure that a disconnecting means is
within sight from, and is readily accessible from, the unit. Disconnect all power to the unit before performing
any maintenance or service on it. Failure to follow this warning can cause electrical shock, fire, personal
injury or death.
To achieve maximum performance and service life of each piece of equipment a formal schedule of regular maintenance should
be established and maintained by a certified contractor.
The following is provided as a recommended maintenance schedule. Specific instructions for maintenance procedures are given
after the check list.
Monthly Check List
Inspect the unit air filters. Clean or replace as required.
Inspect the drain pan to be sure it is clean to permit the flow of condensate through the drain lines.
Inspect the fan belt for wear and alignment. Replace or adjust as required.
Yearly Check List
Clean the blower motor and oil if required.
Inspect the air handler unit casing for corrosion and loose fasteners.
Inspect the blower wheel and housing. Clean if necessary.
Check the motor pulley and blower pulley for alignment and tighten their set screws. Adjust belt tension if necessary.
Inspect all coil connections for leaks. Inspect the coil fins for excessive dirt or damage. Clean or repair if required.
Inspect electrical connections for tightness and controls for proper operating each heating and cooling season.
If strainers are installed in the valve packages, clean per manufactures directions.
CAUTION: As with any mechanical equipment, personal injury can result from sharp metal edges, etc.,
therefore, care should be taken when removing and working on metal parts.
Pulley Alignment and Belt Tension
Belt tension and pulley alignment should be checked annually. Belt tension is adjusted by loosening the four motor mounting
plate bolts and then turning the motor slide adjusting screws clockwise to tighten the belt or counter clockwise to loosen the
belt. See figure 5. A deflection of 3/16 in per foot of span should be obtained by pressing the belt in the middle of the span with
a force of 5 to 7 pounds. See figure 6. Retighten motor mounting plate bolts. Recheck belt tension, readjust if necessary. Alignment
of pulley grooves is made by locating the motor pulley on the motor shaft and securing with setscrew. Then align the blower
pulley on the blower shaft such that the two pulleys are aligned straight with each other, secure blower pulley by tightening set
screw. For blower speed adjustment refer to that section.
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DEFLECTION
SPAN
Figure 5 - Motor Base Figure 6 - Belt Tension