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Separator shall be the high efficiency type, provided with removable
flanged head for ease in removing float assembly and removable screen
cartridge assembly. Pressure drop through a separator shall not exceed [69
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 0.01 mm and larger,]
[thermometer and low temperature thermostat fitted to thermal well,]
[immersion heater,] [external float valve fitted with three-valve bypass,]
and strainer.
2.22.2.4
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 34.5 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.
2.22.3
Condenser and Head Pressure Control
Unit shall be capable of automatically operating without daily or seasonal
adjustments in ambient temperature of [_____] degrees C degrees F. Control
shall be set for refrigerant condensing temperature of [_____] degrees C
degrees F. Controls shall permit proper operation of system with proper
differential pressure across the thermostatic expansion valve. Control
system shall be based on sensing of actual condensing pressure in
conjunction with manufacturer's standard method of subcooling the saturated
refrigerant. Controls shall be set to produce a minimum [_____] degrees C
degrees F subcooling. Subcooling circuit shall be liquid sealed. Air
volume control will not be acceptable for ambient conditions below 2
degrees C 35 degrees F. Necessary accessories shall be provided to
maintain safe compressor discharge temperatures for low temperature systems.
2.22.4
Filter Driers
Driers shall conform to ARI 710. Sizes 16 mm 5/8 inch and larger shall be
the full flow, replaceable core type. Sizes 13 mm 1/2 inch and smaller
shall be the sealed type. Cores shall be of suitable desiccant that will
not plug, cake, dust, channel, or break down, and shall remove water, acid,
and foreign material from the refrigerant. Filter driers shall be
constructed so that none of the desiccant will pass into the refrigerant
lines. Minimum bursting pressure shall be 10 MPa 1,500 psig.
2.22.5
Sight Glass and Liquid Level Indicator
2.22.5.1
Assembly and Components
Assembly shall be pressure- and temperature-rated and constructed of
materials suitable for the service. Glass shall be borosilicate type.
Ferrous components subject to condensation shall be electro-galvanized.
SECTION 15652A
Page 37
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