PTAC/PTHP Units

Perform residential load calculation in accordance with the current version of ANSI/ACCA Manual J (Residential Load Calculation) or equivalent using interior design temperatures of 75 degrees for cooling and 70 degrees for heating

Calculated loads based on post-retrofit dwelling characteristics

Select new unit that:

is ENERGY STAR^® qualified or equivalent

does not use electric resistance heat as the primary heat source (i.e., select Heat Pump units)

is corrosion-resistant in marine climates

is ducted if conditioning multiple rooms

Install unit per manufacturer specifications and in accord with applicable building code

Where applicable, unit controls and thermostat must comply with the operable parts provisions of ICC A117.1 when the dwelling unit is required to be accessible per ADA

Where required, maintain egress requirements in accordance with ANSI/NFPA 101 and local laws

Pipe condensate away from the building or to a sanitary drain

Insulate condensate drain to a minimum of R-3 if danger of freezing or condensation exists

Before installing through-wall unit, seal all adjacent framing and provide a sealed and sleeved opening

After installation, seal the perimeter with suitable materials (e.g., ASTM C1193)

If unit is ducted, insulate all cooling ducts (including those inside the thermal boundary) in accordance with SWS Detail "General Duct Insulation"

Permanently remove equipment from job site and recycle or dispose of removed equipment and refrigerant in accordance with local and federal law (e.g., EPA Section 608 of Clean Air Act of 1990)

Permanently decommission old equipment

Provide occupants/owners with user's manual, warranty information, installation instructions and installer contact information