SAFETY CONSIDERATIONS
Installation and servicing of this equipment can be hazardous due to mechanical and electrical components. Only trained and qualified personnel should install, repair, or service this equipment.
Untrained personnel can perform basic maintenance functions such as cleaning and replacing air filters. All other operations must be performed by trained service personnel. When working on this equipment, observe precautions in the literature, on tags, and on labels attached to or shipped with the unit and other safety precautions that may apply.
Follow all safety codes. Installation must be in compliance with local and national building codes. Wear safety glasses, protective clothing, and work gloves. Have fire extinguisher available. Read these instructions thoroughly and follow all warnings or cautions included in literature and attached to the unit.
Recognize safety information. This is the safety-alert symbol 
. When you see this symbol on the unit and in instructions or manu- als, be alert to the potential for personal injury. Understand these signal words: DANGER, WARNING, and CAUTION. 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 per- sonal injury or death. CAUTION is used to identify unsafe practic- es which may result in minor personal injury or product and prop- erty damage. NOTE is used to highlight suggestions which will result in enhanced installation, reliability, or operation.
!WARNING
ELECTRICAL SHOCK HAZARD
Failure to follow this warning could result in personal injury or death.
Before installing or servicing system, always turn off main power to system and tag. There may be more than one disconnect switch. Turn off accessory heater power switch if applicable.
!CAUTION
CUT HAZARD
Failure to follow this caution may result in personal injury.
Sheet metal parts may have sharp edges or burrs. Use care and wear appropriate clothing.
INTRODUCTION
The 664B packaged heat pump is fully self-contained and designed for outdoor installation (See Fig. 1). Standard units are shipped in a horizontal-discharge configuration for installation on
aground-level slab or directly on the ground if local codes permit. Standard units can be converted to downflow (vertical) discharge configurations for rooftop applications with a field supplied plenum.
RECEIVING AND INSTALLATION
Step 1 — Check Equipment
IDENTIFY UNIT
The unit model number and serial number are printed on the unit informative plate. Check this information against shipping papers.
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 anchorage, 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 equipment distribution office if any item is missing. To prevent loss or damage, leave all parts in original packages until installation.
Step 2 — Provide Unit Support
For hurricane tie downs, contact distributor for details and PE (Professional Engineering) Certificate, if required.
SLAB MOUNT
Place the unit on a solid, level concrete pad that is a minimum of 4 in. (102 mm) thick with 2 in. (51 mm) above grade. The slab should extend approximately 2 in. (51 mm) beyond the casing on all 4 sides of the unit. Do not secure the unit to the slab except when required by local codes.
A 6-in. (152 mm) wide gravel apron should be used around the flat surface to prevent airflow blockage by grass or shrubs. The unit should be level within 1/4 in. (6 mm). This is necessary for the unit drain to function properly.
GROUND MOUNT
The unit may be installed either on a slab or placed directly on the ground if local codes permit. Place the unit on level ground prepared with gravel for condensate discharge.
Step 3 — Provide Clearances
The required minimum service clearances are shown in Fig. 5. Adequate ventilation and outdoor air must be provided.
The outdoor fan draws air through the outdoor coil and discharges it through the top fan grille. 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. (1219 mm) above the unit top. The maximum horizontal extension of a partial overhang must not exceed 48 in. (1219 mm).
IMPORTANT: Do not restrict outdoor airflow. An air restriction at either the outdoor-air inlet or the fan discharge may be detrimental to compressor life.
Do not place the unit where water, ice, or snow from an overhang or roof will damage or flood the unit. Do not install the unit on carpeting or other combustible materials. Slab-mounted units should be at least 4 in. (102 mm) above the highest expected water and runoff levels. Do not use unit if it has been under water.
Step 4 — Place Unit
Unit can be moved with the rigging holds provided in the unit base. Refer to Table 1 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 in. (6 mm) 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.
Step 5 — Select and Install Ductwork
The design and installation of the duct system must be in accordance with the standards of the NFPA for installation of non-residence type air conditioning and ventilating systems, NFPA 90A or 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. 5 for connection sizes and locations. The 14-in. (356 mm) 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.
