3.6
FLASHING AND PITCH POCKETS
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NOTE: Show details of flashings and pitch pockets
on drawings.
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Provide flashing and pitch pockets for equipment supports and roof
penetrations and flashing where piping or ductwork passes through exterior
walls in accordance with Section 07600 FLASHING AND SHEET METAL.
3.7
IDENTIFICATION TAGS AND PLATES
Provide equipment, gages, thermometers, valves, and controllers with tags
numbered and stamped for their use. Provide plates and tags of brass or
suitable nonferrous material, securely mounted or attached. Provide
minimum letter and numeral size of 3.18 mm 1/8 inch high.
3.8
FIELD QUALITY CONTROL
3.8.1
Leak Testing
Upon completion of installation of air conditioning equipment, test
factory- and field-installed refrigerant piping with an electronic-type
leak detector. Use same type of refrigerant to be provided in the system
for leak testing. When nitrogen is used to boost system pressure for
testing, ensure that it is eliminated from the system before charging.
Minimum refrigerant leak field test pressure shall be as specified in
ASHRAE 15, except that test pressure shall not exceed 1034 kPa (gage) 150
psig on hermetic compressors unless otherwise specified as a low side test
pressure on the equipment nameplate. If leaks are detected at time of
installation or during warranty period, remove the entire refrigerant
charge from the system, correct leaks, and retest system.
3.8.2
Evacuation, Dehydration, and Charging
After field charged refrigerant system is found to be without leaks or
after leaks have been repaired on field-charged and factory-charged
systems, evacuate the system using a reliable gage and a vacuum pump
capable of pulling a vacuum of at least 133 Pa one mm Hg absolute.
Evacuate system in accordance with the triple-evacuation and blotter method
or in accordance with equipment manufacturer's printed instructions and
recharge system.
3.8.3
Start-Up and Initial Operational Tests
Test the air conditioning systems and systems components for proper
operation. Adjust safety and automatic control instruments as necessary to
ensure proper operation and sequence. Conduct operational tests for not
less than 8 hours.
3.8.4
Performance Tests
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NOTE: List the readings desired for a particular
system if not covered by Section 15950, "HVAC
Testing/Adjusting/Balancing."
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SECTION 15730N
Page 28
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