First Co WH-XH User Manual
WHS / WHD / XHS / XHD
INSTALLATION, OPERATION & MAINTENANCE INSTRUCTIONS
**WARNING TO INSTALLER, SERVICE PERSONNEL AND OWNER**
Altering the product or replacing parts with non authorized factory parts voids all warranty or implied warranty
and may result in adverse operational performance and/or a possible hazardous safety condition to service
personnel and occupants. Company employees and/or contractors are not authorized to waive this warning.
Current Maintenance Program is available at www.firstco.com under "Product Information".
NOTE: Read the entire installation instruction manual before starting the installation.
SAFETY CONSIDERATIONS
Improper installation, adjustment, alteration, service, maintenance, or use can cause explosion, fire, electrical shock, or other
conditions which may cause personal injury or property damage. Consult a qualified licensed installer, service agency, or
your distributor for information or assistance. The qualified licensed installer or service agency must use factory-authorized
kits or accessories when modifying this product. Refer to the individual instructions packaged with kits or accessories
when installing.
Follow all safety codes. Wear safety glasses and work gloves. Use quenching cloth for brazing operations. Have fire
extinguisher available. Read these instructions thoroughly and follow all warnings or cautions attached to the unit. Consult
local building codes and National Electrical Code (NEC) for special requirements.
Recognize safety information. This is the safety-alert symbol . When you see this symbol on the unit and in instructions manuals, be alert to the potential for personal injury.
Understand the signal words DANGER, WARNING, CAUTION, and NOTE. These words are used with the safety-alert
symbol. DANGER identifies the most serious hazards which will result in severe personal injury or death. WARNING
signifies hazards which could result in personal injury or death. CAUTION is used to identify unsafe practices which would
result in minor personal injury or product and property damage. NOTE is used to highlight suggestions which will result in
enhanced installation, reliability, or operation.
WARNING: Before installing or servicing unit, always turn off all power to unit. There may be more than
one disconnect switch. Turn off accessory heater power if applicable. Electrical shock can cause personal
injury or death.
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L4541 9/07
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 specifications.
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PROCEDURE 2 – MOUNT AIR HANDLER
WARNING: Do not suspend the air handler unit from the top panel. The unit top will not support the weight
of the unit. Equipment damage and severe personal injury or death could result.
All air handler units are agency listed for horizontal installation with zero inches clearance to combustible materials. This
includes the unit cabinet, discharge plenum and connecting ducts. The unit can be floor mounted or suspended with
hanging rods. If hanging rods are used the unit has knockouts in each corner of the top and base panel for the suspension
rods to pass through. It is recommended that angle iron or unistrut be used under the unit for support when suspension
rods are used. Unit vibration isolators are recommended for all installations.
Flexible connections on the inlet and outlet duct connections of the unit are recommended.
SUSPENSION ROD
UNIT MOUNTING ANGLES
5
2 3/4 2 3/4
TOP VIEW
2 3/4 2 3/4
5
4 1/2
AIRFLOW
4 1/2
Figure 1
WARNING: Before installing the unit, determine whether unit weight can be safely supported by the
structure. Failure to follow this WARNING could result in product or property damage and personal injury.
Sufficient clearance must be provided around the unit for proper maintenance, filter removal, lubrication, belt adjustment,
removal of coils, drain pan and blower assembly. This clearance distance should be approximately the same width as the
unit.
NOTE: Before mounting unit remove red headed shipping bolts and metal bushings under blower
base rails.
IMPORTANT: When unit is installed over a finished ceiling and/or living area, building codes may require a field-supplied
secondary condensate pan to be installed under the entire unit. Some localities may allow the alternative of running a
separate secondary condensate line or applying a field mounted condensate overflow switch. Consult local codes for
additional restrictions or precautions.
NOTE: When installing any air handler over a finished ceiling and/or living area, installation of a secondary drain pan under
entire unit is recommended to avoid damage to ceiling.
CAUTION: Extreme caution must be taken that no internal damage will result if screws or holes are drilled
into the cabinet. Failure to follow this CAUTION could result in product or property damage and minor
personal injury.
CAUTION: The unit should be leveled in such a way that there is slope toward the condensate drain nipple
to assure positive drainage. Failure to follow this CAUTION could result in product or property damage.
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