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PACKAGED AIR CONDITIONING UNITS Section 15855 15-1207 Air Filters: 1. Provide two-inch thick, pleated MERV 8, 30%, filters with cardboard holding frames. 2. Air filters shall be of an approved type tested in accordance with test method SFM-31.6 as shown in Article 80, Title 19, California Code of Regulations. Pre -formed filters having combustible framing shall be tested as a complete assembly. 3. Air filters in all occupancies shall be Class 2 or better, as defined in the test method above. 4. Air filters shall be accessible for cleaning or replacement. 5. Provide sufficient spare filters for two complete changes for each unit. Gas Heat Exchanger: 1. Unless noted otherwise, units shall be complete with gas heating section made up of aluminized steel heat exchanger capable of mixed air temperatures as low as 40 OF. 2. Where noted on drawings, units shall be complete with gas heating section made up of 304 stainless steel heat exchanger capable of mixed air temperatures as low as 20 IF. 3. Heat shall be single -stage with intermittent spark electric ignition system and flame sensor. K. Economizer: 1. Provide factory dry-bulb 0-100% economizer with barometric relief. a. Shall be listed on the CEC web site. b. Maximum damper leakage rate to be equal to or less than 10.0 cfm/sq. ft. at 1.0 in. w.g., meeting or exceeding Title 24 2013 requirements. Economizer controller shall be Honeywell W7220 that provides: • 2 -line LCD interface screen for setup, configuration and troubleshooting. • On -board fault detection and diagnostics Sensor failure loss of communication identification • Automatic sensor detection Capabilities for use with multiple -speed indoor fan systems • Utilize digital sensors: Dry bulb and Enthalpy • 5 year manufacture parts warranty L. Field installed power exhaust capable of approximately 35% of unit nominal airflow. M. TXV: Provide factory installed thermal expansion valve (TXV) for each refrigerant circuit. N. Phase/Voltage Monitor and Protection Device: 1. Provide unit with standard factory installed and tested phase/voltage monitor. 2. Monitor shall have two LED indicator lights. One shall indicate a balanced, three-phase power supply circuit and the other shall indicate that unit operation has been prevented and that the power supply circuit is either not balanced, properly connected or that the line -to - line voltage is not between 180 volts and 633 volts. 3. The monitor shall protect unit from damage if any of the following occur: a. If power is lost on one of the three conductors of the three-phase power supply circuit. b. If voltage is not sufficiently balanced between the three conductors of the three-phase power supply circuit. c. If the three-phase power supply circuit does not have the proper phase sequence. 2.03 PACKAGED AIR CONDITIONING UNITS 6 THRU 25 TONS: A. Cooling System: 1. The total certified cooling capacity shall not be less than scheduled. 2. The compressor power input shall not exceed that of the unit specified. 4