MasterCool 69000 Manuel D'opération page 4

filter is very important for the proper operation of the System. See "Routine Maintenance" section.
PUSH – PULL LIQUID RECOVERY METHOD
The push –pull liquid recovery technique permits recovery of large volumes of liquid refrigerant from HVAC
or refrigeration systems. The Recovery System pulls vapor from the recovery cylinder and produces high
pressure vapor that is discharged into vapor service port of system being evacuated. The liquid service port
is connected to liquid inlet on recovery tank.
Note: Recovery tank must be used with a scale that shuts of refrigerant flow when tank reaches 80% of
its capacity. When the Recovery System is started vapor from the recovery tank is compressed and sent,
at high pressure, to HVAC or refrigeration system. As pressure builds, the liquid is "pushed" out of unit into
recovery tank. Vapor from recovery tank is "pulled" out of recovery tank, compressed, and then pressurizes
unit.
Note: Some systems may not have liquid service port. This prevents the push-pull technique from being
used.
Procedure for Push-Pull technique (Connect system per fig. 2 and following instructions).
1. Connect outlet port of Recovery System to vapor port of unit to be serviced. Use hoses with automatic or
manual valves on both ends to prevent refrigerant release when disconnecting.
2. Connect liquid port on unit to be serviced to liquid port on recovery tank. Recovery tank should be on a
scale that stops flow when 80% tank capacity is reached. This connection should be made with a
manifold gauge set with sight glass to verify liquid flow. Recovery tank must have a minimum pressure
rating of 38 bar (550 psi).
3. Connect vapor port of recovery tank to inlet port of Recovery System. Use hose with automatic or manual
valve on both ends.
4. Open valves on unit to be evacuated. Open valves on recovery tank.
5. On Recovery System, rotate outlet valve to "OPEN" position. Rotate center valve to "RECOVER" position.
Rotate inlet valve to "OPEN" position.
6. Start Recovery System.
7. Check the sight glass for the presence of liquid flow. When liquid stops flowing, rotate inlet valve on
Recovery System to "CLOSED" position. When Recovery system shuts down due to vacuum, turn OFF
the power switch. Reconnect system for direct vapor recovery following instructions listed under
"Operating Guide for Direct Vapor or Liquid Recovery".
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FIGURE 2
Recovery
System
Approved
Recovery
5
Tank
S U C T IO N P R E S S U R E
C IR C U T
B R E A K E R
P O W E R
IN L E T
5
34
Use Sight Glass
or
Manifold W/Sight Glass
(Refer to fig. 2)
34
D IS C H A R G E P R E S S U R E
L IQ U ID
P U R G E
C L O S E
P U R G E (S T A R T ) O U T L E T
Vapor
Liquid
Air Conditioning
or
Refrigeration System