First Co WH / XH Horizontal Double wall - Manual (Page 2)

GENERAL
The manufacturer assumes no responsibility for equipment installed in violation of any code requirement.
These instructions give information relative to the installation of these air handlers only. For other related equipment refer to
the proper instructions.
Material in this shipment has been inspected at the factory and released to the transportation agency in good condition. When
received, a visual inspection of all cartons should be made immediately. Any evidence of rough handling or apparent damage
should be noted on the delivery receipt and the material inspected in the presence of the carrier’s representative. If damage is
found, a claim should be filed against the carrier immediately.
In keeping with its policy of continuous progress and product improvement, the manufacturer reserves the right to discontinue
or change without notice any or all specifications or designs without incurring obligations.
INTRODUCTION
Model nomenclature for the air handlers described in this installation instruction are as follows:
WHS - Belt Drive Horizontal Air Handler with water coils and exposed insulation.
WHD - Belt Drive Horizontal Air Handler with water coils and double wall lined construction.
XHS - Belt Drive Horizontal Air Handler with direct expansion, water coil and exposed insulation.
XHD - Belt Drive Horizontal Air Handler with direct expansion, water coil and double wall lined construction.
The air handler units are designed for horizontal left or right applications with nominal air capacities of 800 through 8000
CFM. Models incorporate a positive slope plastic drain pan with 3/4” PVC drain coupling. Optional equipment includes,
multiple coil combinations in water and direct expansion, one and two row hot water coils, multiple filter box combinations,
mixing boxes and a large selection of motor / pulley drive selections.
INSTALLATION
The licensed installer must adhere strictly to all local and national code requirements pertaining to the installation of this
equipment.
All air handling units are agency listed for installation with zero inches clearance to combustible materials. This includes the unit
cabinet, discharge plenum and connecting ducts.
Sufficient clearance must be provided around the unit for proper maintenance, filter removal, lubrication, belt adjustment, removal
of coils, drain pan and blower assembly.
Flexible connections on the inlet and outlet duct connections of the unit are recommended.
Installation Precautions
Always use proper tools and equipment.
No wiring or other work should be attempted without first ensuring that the air handler is completely disconnected from the power
source and locked out. Always verify that a good ground connection exists prior to energizing any power sources.
Always review the nameplate on each unit for proper voltage and control configurations. This information is determined from
the components and wiring of the unit and may vary from unit to unit.
When soldering or brazing to the unit, it is recommended to have a fire extinguisher readily available. When soldering close to
valve packages or other components, heat shields or wet rags are required to prevent damage.
When the air handler unit is in operation components are rotating at high speeds.
Units must be installed level to ensure proper drainage and operation.
Be sure that the drain pan is free from foreign material prior to start up.
Check filter media installation to ensure that it is installed correctly. Use the directional arrows or other information on the filter
to determine the proper flow direction.
Ensure that the air distribution system does not exceed the external static rating of the unit.
PROCEDURE 1 – CHECK EQUIPMENT
Unpack unit and move to final location. Remove packaging taking care not to damage unit.
Inspect air handler unit for damage prior to installation. File a claim with shipping company if shipment is damaged.
Carefully inspect blower for rough handling that can cause misalignment or shaft damage.
Locate unit nameplate which contains proper installation information. Check nameplate to be sure unit matches job specifi-
cations.
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