column;] [external float switches;] and purge, charge, equalizing,
pressurizing, plugged drain and service valves on the inlet and outlet
connections. Receiver shall be provided with a relief valve of capacity
and setting in accordance with ASHRAE 15.
2.10.6.3
Separator shall be the high efficiency type and be provided with removable
flanged head for ease in removing float assembly and removable screen
cartridge assembly. Pressure drop through a separator shall not exceed
[70] [_____] kPa [10] [_____] psi during the removal of hot gas entrained
oil. Connections to compressor shall be as recommended by the compressor
manufacturer. Separator shall be provided with an oil float valve assembly
or needle valve and orifice assembly, drain line shutoff valve, sight
glass, [filter for removal of all particulate sized 10 microns and larger,]
[thermometer and low temperature thermostat fitted to thermal well,]
[immersion heater,] [external float valve fitted with three-valve bypass,]
and strainer.
2.10.6.4
Oil Reservoir
Reservoir capacity shall equal one charge of all connected compressors.
Reservoir shall be provided with an external liquid gauge glass, plugged
drain, and isolation valves. Vent piping between the reservoir and the
suction header shall be provided with a 35 kPa 5 psi pressure differential
relief valve. Reservoir shall be provided with the manufacturer's standard
filter on the oil return line to the oil level regulators.
2.10.7
Internal Dampers
**************************************************************************
NOTE: Specify the sequence of operation of all
damper operations on the drawings.
**************************************************************************
Dampers shall be parallel blade type with renewable blade seals and be
integral to the unitary unit. Damper provisions shall be provided for each
outside air intake, exhaust, economizer, and mixing boxes. Dampers shall
[have minimum position stops] [be linked together] [have [manual]
[automatic] modulation] and operate as specified.
2.10.8
Mixing Boxes
Mixing boxes shall match the base unit in physical size and shall include
equally-sized [flanged] openings, each capable of full air flow.
Arrangement shall be as indicated.
2.10.9
Cabinet Construction
**************************************************************************
NOTE: Delete this paragraph if room
air-conditioner/heat pumps or air-conditioners for
EDP spaces are specified.
**************************************************************************
Casings for the specified unitary equipment shall be constructed of
galvanized steel or aluminum sheet metal and galvanized or aluminum
structural members. Minimum thickness of single wall exterior surfaces
shall be 1.3 mm (18 gauge) 18 gauge galvanized steel or 1.8 mm 0.071 inch
SECTION 15700A
Page 41
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