Procedure for Using the Refrigerant Receiver (Fig. 9)
During Normal Operation — Valve A is open and valves B
and C are closed. Receiver is isolated from the system.
For Servicing — Valves A and C are closed and valve B is
open. Run unit until all the refrigerant is in the receiver and
then close valve B. Unit is now ready for servicing.
To Resume Operation — Leave valveAclosed and open valves
B and C. Run unit until the stored refrigerant is drawn into
the system. To completely remove the refrigerant from the
receiver, throttle valve B while noting condition of refrig-
erant in the liquid line sight glass; also monitor suction pres-
sures. A sudden surge of bubbles in the sight glass and a
rapid decrease in suction pressure indicates that all the re-
frigerant has been withdrawn from the receiver. Immedi-
ately close valves B and C, and then open valve A. The unit
should now be ready for normal operation, with the receiver
isolated from the system. The system should be charged to
a clear sight glass when under normal operation.
COIL CONNECTIONS — See Table 2 for the necessary
connections.
LIQUID LIFT — Amount of liquid lift available before re-
frigerant flashing occurs depends on amount of liquid sub-
cooling in the system.
All 09BY condensers have positive subcooling when ap-
plied with optimum charge. With subcooling, it is possible
to overcome an appreciable pressure drop and/or static head
pressure (due to elevation of the liquid metering device above
the condenser when condenser is below evaporator coil).
When 09BY condensers are applied with minimum charge,
they do not provide positive subcooling. If subcooling is re-
quired, it must be obtained by external means such as a liq-
uid suction interchanger.
It is recommended that the evaporator be either at the same
level as the condenser or lower than the condenser when mini-
mum is used.
SWEAT CONNECTIONS — Connections are made inside
the unit, and piping may enter from either side. For ease in
brazing, it is recommended that all internal solder joints be
made before unit is placed in its final position. See 50BZ (or
other compressor-bearing unit) base unit installation instruc-
tions for proper line sizing and piping procedures.
FIELD PIPING — For 09BY remote installation, select pipe
sizes according to length from Table 3.
Use refrigerant grade piping. If tubing size is other than
unit connection sizes, use adapter fittings.
Refer to 50BZ (or other compressor-bearing unit) base unit
installation instructions to determine refrigerant charge ad-
justment for remote and special piping applications.
NOTE: When installing 09BY units in systems, add charge
for other components (i.e., filter drier, moisture indicator, etc.)
to determine system charge quantity. Record charge.
MANIFOLDING CIRCUITS — The 09BY units with cir-
cuits (012-024 units) may be manifolded together to be used
as a single-circuit condenser. See Fig. 10 for a typical con-
nection of a 2-circuit condenser for use on one circuit. When
manifolding circuits, NEVER CONNECT TWO SEPA-
RATE COMPRESSOR EVAPORATOR CIRCUITS TO-
GETHER ON THE SAME CONDENSER CIRCUIT. Pipe
sizes for the combined circuit should be no smaller than the
sizes shown in Table 3.
*Field-supplied service valves.
A—Bypass Valve
B—Receiver Inlet Valve
C—Receiver Outlet valve
Fig. 9 — Piping for Optional Receiver
Fig. 10 — Typical 2-Circuit Condenser Manifolded
For Single-Circuit Use
10
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