Alternate specification for molded wall case

Wall Cases and Grilles are needed for new installations

Alternate specification for steel wall case.

Wall case shall be constructed of heavy gauge, zinc-coated, phosphated steel, insulated and shall have a protective baked-on enamel finish. Bottom critical points of the steel wall case shall be treated with petroleum microcrystalline wax for added corrosion protection and shall meet ASTM B-117, 1800 hour hot air aerated salt spray test.

Alternate specification for molded wall case.

Wall case shall be constructed of a non-corroding fiberglass reinforced polyester compound.

Cases shall be installed through exterior walls where shown on the plans and shall be installed per manufacturer’s installation instructions. In no instance shall fasteners be used through the bottom in order to retain the water integrity of the bottom of the wall case.

Outside weather panels shipped with the cases shall remain in place until the outdoor air louvers and chassis are installed, at which time they are to be removed and discarded by the installer.

Outside Grille. Each unit shall be equipped with a standard exterior grille that has been designed to allow unit operation in high ambient conditions. Grilles shall be of material and design specified.

Special grilles or customer louver sections to be supplied by others will conform to minimum free area requirements for unit performance and shall be submitted to the PTAC/PTHP manufacturer, if requested, for feasibility and airflow characteristics.

Specifications for Sub-base (if required).

Sub-Base.Each unit shall have a field installed UL listed electrical sub-base. The sub-base shall be attached to the lower inside flange of the wall case prior to installation in the exterior wall and shall include adjustable screws at the bottom corners to permit exact leveling of the wall case. The sub-base shall have a factory installed receptacle to allow unit line cord to plug into mating receptacle and shall have a chaseway to contain and conceal the line cord. The sub- base shall have side panels adjustable from a minimum of

2 3/8" to a maximum of 13 3/4" to enclose the area under the wall case.

Weather Resistance. Complete unit including outside louver shall be submitted to an independent agency for weather resistance and water infiltration tests.

Air infiltration test to be conducted in accordance with ASTM E283-91. With static air pressure differential of 1.57 lb./ft.2 (.3" H2O) equivalent to 25 mph wind, allowable air infiltration shall not exceed 7 ft.3/min.

Water infiltration test to be conducted in accordance with ASTM E331-86 with static air pressure differential of 10.0 lb./ft2 (1.93" water) equivalent to 63 mph wind, 5.0 gal./ft.2 (8" rain/ft.2/hr.) for 15 minutes and there shall be no leakage into the room.

Approvals. Units shall be certified under the ARI and cUL certification program and listed by UL.

Service. Submit complete information with bid covering service availability, to whom service on units will be assigned, complete address and phone number, including phone number of emergency service personnel.

Start-Up, Adjust, Demonstrate. Contractor shall be responsible for the initial starting of units, adjustments thereto, etc., to place the units in required operating condition. Contractor shall demonstrate to the owner, or his representative, the operation of units for both summer and winter functions.

Warranty. The warranty shall be a full one year parts and labor on entire unit plus an additional full four years parts and labor for the sealed refrigerating system, including service call for diagnosis, and transportation to and from service shop, if necessary, at no charge to customer. The warranty shall also include a limited 2nd thru 5th year parts only warranty for fan motors, switches, thermostat, heater, heater protectors, compressor overload, solenoids, circuit boards, auxiliary controls, thermistors, frost controls, ICR pump, capacitors, varistors, and indoor blower bearing.

Installation Responsibility. Units shall be installed according to the manufacturer’s recommendations and the manufacturer shall not be responsible for unit failure as a result of improper installation, or unit performance when installed with accessories not approved by the manufacturer.