Refrigerant Piping - McQuay seasoncon ALP-067A Installation And Maintenance Data

REFRIGERANT PIPING

General
McQuay type ALP condensing units are adaptable to either chilled
water or air handling air conditioning applications.
striction on applications is that the evaporator be selected for a
system using refrigerant 22.
Evaporator Above Condensing Unit
Figure 6 shows an installation where the evaporator is installed
above the condensing unit.
lation but all components shown are recommended for chilled water
installations except that a refrigerant distributor is not usually
required for shell-and-tube evaporators.
FIGURE 6
Legend
a Filter-drier
b Solenoid valve
Sight-glass/moisture indicator
Thermal expansion valve
e Suction line, pitched toward compressor
f Liquid line
Vibration absorber
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Evaporator Below Condensing Unit
Figure 7 shows an installation where the evaporator is installed be-
low the condensing unit.
tion but all components shown are recommended for chilled water in-
stallations except that a refrigerant distributor is not usually re-
quired for shell-and-tube evaporators.
riser is shown for this arrangement.
Risers "A + B" are sized so that their combined cross-sectional in-
ternal area will allow full load unit operation without excessive
pressure drop (see notes, Table 4).
adequate suction gas velocity for proper oil return at minimum load
conditions. This riser becomes effective only when the trap shown
in riser "A" fills itself with oil.
the trap shown in riser "A" should be designed to contain a minimum
internal volume to keep the total system oil requirements at a mini-
mum. Table 4 gives recommended line sizes for both single and double
suction lines and for liquid lines.
It is shown for an air handling instal-
EVAPORATOR ABOVE CONDENSING UNIT
Notes:
1. Piping shown is for one circuit only, second circuit is similar.
2. All piping & piping components are by others.
It is shown for an air handling installa-
Riser "B" is sized to provide
It should be emphasized that
The only re-
Mote that a double suction
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