First Co WCX12 User Manual

WCX12 Series

R410a Condensing Unit

INSTALLATION INSTRUCTIONS

**WARNING TO INSTALLER, SERVICE PERSONNEL AND OWNER**

Altering the product or replacing parts with non authorized factory parts voids all warranty or implied war-

ranty 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.fi rstco.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, fi re, electrical shock, or other condi-
tions which may cause personal injury or property damage. Consult a qualifi ed licensed installer, service agency, or your distributor
for information or assistance. The qualifi ed 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 fi re 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 identifi es the most serious hazards which will result in severe personal injury or death. WARNING signifi es 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.

GENERAL

The manufacturer assumes no responsibility for equipment installed in violation of any code requirement. The information present­ed here has been prepared to assist in the proper installation of the air conditioning system. Improper installation can result in unsatis­factory operation and/or dangerous conditions, and can cause the related warranty to be voided.

Read these instructions and any instructions packaged with separate equipment required to make up the system prior to installation.

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 fi led against the carrier immediately.

L2583-2 6/10

WARNING: Before installing or servicing unit, always turn off all power to unit. There may be more than one disconnect
switch. Electrical shock can cause personal injury or death.

INSTALLATION PRECAUTIONS

Installation of this equipment should only be performed by properly trained personnel to ensure proper installation and the safety of
the installer.

Compressor start assist devices (capacitor and start potential relay) may be required for installations with long line length, unusually
high or low ambient operating conditions, thermostatic expansion valves or any other situation which can lead to slow off cycle pres­sure equalization and excessive compressor starting problems.

UNIT LOCATION

This unit is intended to be used in a thru-the-wall application with the coil surface side of the unit exposed to the outside of the
structure and the unit access panel exposed inside the structure. A wall opening of suffi cient size to allow sliding the unit through
must be provided with framework suffi cient to support the unit to the wall. The unit cabinet must not be relied on to provide wall
support. Mounting angles are provided for use in attaching the unit cabinet to the framework on the inside surface of the opening. In
attaching the angles to the unit cabinet take care that no screws are driven into the refrigerant tubing inside the cabinet. The opening
around the unit must be caulked and sealed to prevent rain leakage. Use silicone sealant or other high grade non hardening sealing
compound approved for exterior use. (See fi gure 1)

CAULK WA TER TIGHT

Note: WCX12 cabinet should protrude
thru wall beyond the fi nished outside
surface by 1/4 to 1/2 inch.

AIR OUT

TYPICAL INSTALLATION

(SIDE VIEW)

AIR IN

EXTERIOR BUILDING
SURFACE

INSIDEOUTSIDE

REFRIGERANT PIPING

(FIELD SUPPLIED)

MOUNTING ANGLES (2)

(SUPPLIED WITH UNIT

FIELD INSTALLED)

SER VICE ACCESS PANEL

T’ST AT WIRING

ELECTRICAL SUPPLY

FIGURE 1

Care must be taken not to block the drain holes provided at the bottom of the unit. These holes allow for drainage of any rain that
may be blown into the unit.

CAUTION: If a reduction of air fl ow or a recirculation of air fl ow occurs the unit performance will decrease. This
condition will cause premature equipment failure and void all warranties.

For the unit to function properly, there must be no restriction to free circulation of the condenser air. If architectural design consid­erations make it necessary to locate the unit behind a decorative grille the unit performance will be reduced if a reduction of air fl ow
or a recirculation of air fl ow occurs. It may be necessary to provide a baffl e between the face of the unit and the decorative grille to
prevent recirculation of the hot discharge air back into the coil face. The added grille must be as open as possible to achieve the best
performance.

If more than one WCX12 unit is to be installed in the same area a minimum of 36”spacing on the vertical and 18" on the horizontal
is recommended between units to minimize recirculation of condenser exhausted air.

For units that are to be installed in the interior of a building or in return air spaces care should be taken to seal any openings in the
cabinet that would allow hot condensing unit air into the conditioned space. Failure to seal these openings may result in erratic system
operation and in driving rain situations may allow water infi ltration into the structure.

In cold climate areas, units installed in interior and return air spaces may require that insulation be added to the exterior of the
WCX12 cabinet to reduce heat loss thru the cabinet and possible condensation on the cabinet surfaces which could result in water
damage.