Inspect Shipment; Provide Unit Support; Slab Mount; Ground Mount - Payne PA3Z Installation Manual

B. INSPECT SHIPMENT
Inspect for shipping damage while unit is still on shipping pallet. If unit appears to be damaged or is torn loose from its securing points, have it
examined by transportation inspectors before removal. Forward claim papers directly to transportation company. Manufacturer is not responsible
for any damage incurred in transit.
Check all items against shipping list. Immediately notify the nearest Payne Distributor if any item is missing.
To prevent loss or damage, leave all parts in original packages until installation.
PROCEDURE 2—PROVIDE UNIT SUPPORT
A. SLAB MOUNT
Place the unit on a rigid, level surface, suitable to support the unit weight. A concrete pad or a suitable fiberglass mounting pad is recommended.
The flat surface should extend approximately 2-in. beyond the unit casing on the 2 sides. The duct connection side and condensate drain connection
sides should be flush with the edge of the flat surface.
A 6-in. wide gravel apron should be used around the flat surface to prevent airflow blockage by grass or shrubs. Do not secure the unit to the flat
surface except where required by local codes.
The unit should be level to within 1/4 inch. This is necessary for the unit drain to function properly.
B. GROUND MOUNT
The unit may also be installed directly on the ground if local codes permit. Place unit on level ground prepared with gravel for condensate
discharge.
PROCEDURE 3—PROVIDE CLEARANCES
The required minimum service clearances and clearances to combustibles are shown in Fig. 2. Adequate ventilation and outdoor coil air must be
provided.
The outdoor fan pulls air through the outdoor coil and discharges it through the fan on the top cover. Be sure that the fan discharge does not
recirculate to the outdoor coil. Do not locate the unit in either a corner or under an overhead obstruction. The minimum clearance under a partial
overhang (such as a normal house overhang) is 48 in. above the unit top. The maximum horizontal extension of a partial overhang must not exceed
48 inches.
Do not place the unit where water, ice, or snow from an overhang or roof will damage or flood the unit. The unit may be installed on wood flooring
or on Class A, B, or C roof covering materials.
A. Hurricane Hold Down
Contact your local distributor for specific hurricane hold down details and PE (Professional Engineer) certification when required.
CAUTION: OPERATIONAL HAZARD
Failure to follow this caution may result in unit component damage.
Do not restrict outdoor coil airflow. An air restriction at either the outdoor-air inlet or the fan discharge can be harmful to
compressor life.
PROCEDURE 4—PLACE UNIT
Unit can be moved with the rigging holds provided in the unit base. Refer to Table 2 for operating weights. Use extreme caution to prevent damage
when moving the unit. Unit must remain in an upright position during all moving operations. The unit must be level with in 1/4" for proper
condensate drainage; the ground-level pad must be level before setting the unit in place. When a field-fabricated support is used, be sure that the
support is level and that it properly supports the unit.
PROCEDURE 5—SELECT AND INSTALL DUCTWORK
The design and installation of the duct system must be in accordance with:
• the standards of the NFPA (National Fire Protection Association) for installation of nonresidence-type air conditioning and ventilating systems
• NFPA90A or residence-type, NFPA90B; and/or local codes and residence-type, NFPA 90B
• and/or local codes and ordinances
Select and size ductwork, supply-air registers and return-air grilles according to ASHRAE (American Society of Heating, Refrigeration, and Air
Conditioning Engineers) recommendations.
Use the duct flanges provided on the supply- and return-air openings on the side of the unit. See Fig. 2 for connection sizes and locations. The
14-in. round duct collars are shipped inside the unit attached to the base pan in the indoor blower compartment. They are field-installed and must
be removed from the indoor blower compartment prior to start-up, even if they are not used for installation.
When designing and installing ductwork, consider the following:
CAUTION: UNIT DAMAGE HAZARD
Failure to follow this caution may result in damage to unit components. When connecting ductwork to units, do not drill
deeper than 3/4 inch in shaded area shown in Fig. 3 or coil may be damaged.
• All units should have field-supplied filters installed in the return-air side of the unit. Recommended sizes for filters are shown in Table 2.
• Avoid abrupt duct size increases and reductions. Abrupt change in duct size adversely affects air performance.
IMPORTANT: Use flexible connectors between ductwork and unit to prevent transmission of vibration. Use suitable gaskets to ensure
weathertight and airtight seal. When electric heat is installed, use fire proof canvas (or similar heat resistant material) connector between ductwork
and unit discharge connection. If flexible duct is used, insert a sheet metal sleeve inside duct. Heat resistant duct connector (or sheet metal sleeve)
must extend 24–in. from the unit discharge connection flange into the ductwork.
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