McQuay SEASONCON ALP-037A, Руководство пользователя, Страница: 6 / 43

REFRIGERANT PIPING
G E N E R A L
McQuay type ALP condensing units are adaptable to either
chilled water or air handling air conditioning applications.
The only restriction on applications is that the evaporator
be selected for a system using refrigerant 22.
EVAPORATOR BELOW CONDENSING UNIT
EVAPORATOR ABOVE CONDENSING UNIT
Figure 6 shows an installation where the evaporator is
installed above the condensing unit. It is shown for an air
handling installation but all components shown are recom-
mended for chilled water installations, except that a refrig-
erant distributor is not usually required for shell-and-tube
evaporators.
Figure 7 shows an installation where the evaporator is
installed below the condensing unit. It is shown for an air
handling installation, but all components shown are recom-
mended for chilled water installations except that a refrig-
erant distributor is not usually required for shell-and-tube
evaporators. Note that a double suction riser is shown for
this arrangement.
Risers
“A + B” are sized so that their combined cross-
sectional internal area will allow full load unit operation
without excessive pressure drop (see notes, Table 4). Riser
“B” is sized to provide adequate suction gas velocity for
FIGURE 6. EVAPORATOR ABOVE CONDENSING UNIT FIGURE 7. EVAPORATOR BELOW CONDENSING UNIT
A I R F L O W
LEGEND
Filter-Drier
Solenoid Valve
Indicator
Thermal Expansion Valve
e Suction Line, pitched toward compressor
f Liquid Line
Vibration Absorber
Double Suction Riser note
NOTES:
1. Piping shown is for one circuit only; second circuit is similar.
2. All piping and piping components are by others.
3. Trap for double suction riser should be as small in the horizontal
as fittings will allow.
TABLE 4.
1 4 9 0 - D
1 5 9 0 - D
2 2 2 3
1
2 3 1 518 2 3
2 3
1 2 3 1
2 3
1
2 3
1
2 3
1
2
1
3
1
‘Double suction risers recommended.
NOTE: Liquid and suction lines based on a recommended pressure drop of 3 PSIG (2F) par 100 ft of equivalent length.
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