Push Pull Operation - JAVAC XTR-PRO-DV Sicherheitsanweisungen Und Bedienungsanleitung

5.4 PUSH/PULL OPERATION
5.4.1 The PUSH PULL method is used to move a large amount of liquid refrigerant from the system
being serviced to the recovery cylinder without passing it through the compressor. This method is
only useful when more than 7 Kg of liquid is known to be in the system and it can be easily isolated.
DO NOT ATTEMPT the PUSH PULL process unless you are sure of the situation.
5.4.2 Connect the refrigerant hoses as shown below. Addition of a SIGHT GLASS in line between the
system being serviced and the recovery cylinder can be an important aid to determine when all the
liquid has been transferred and only vapour remains.
5.4.3 This process uses the PULL from the exhausted recovery cylinder and the Discharge PUSH
from the recovery unit to move the liquid refrigerant. Rates in excess of 5 Kg per minute can be
achieved by this procedure.
5.4.4 The SCALE is required in this process to ensure that the cylinder is not overfilled. The cylinder
shutoff switch, if used, would stop the compressor but could not guarantee that additional refrigerant
flow would cease because of the dynamics of the system, thus possibly overfilling the cylinder.
RECOVERY UNIT
SET-UP PROCEDURE FOR PUSH/PULL METHOD
LIQUID
FILTER
CYLINDER
WITH
POWER
CT-OFD
SOURCE
SCALE
VAPOUR
DURING NORMAL RECOVERY
SYSTEM
V2
RECOVER
OPEN
LIQUID
V3
URGE CLOSE
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RECOVERY UNIT
POWER
SOURCE
VAPOUR
VALVE POSITIONS DURING PURGE OPERATION
LIQUID
V2
PURGE
CYLINDER
CLOSE
WITH
CT-OFD
V1
OPEN PURGE
SCALE
VALVE POSITIONS FOR PUSH/PULL METHOD
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RECOVERY UNIT
LIQUID
CYLINDER
SCALE
FILTER
POWER
SOURCE
RECOVER
OPEN
V3
CLOSE OPEN
RECOVERY UNIT
VAPOUR
VAPOUR
LIQUID
SYSTEM
CYLINDER
WITH
LIQUID
CT-OFD
SCALE
VALVE POSITIONS FOR PUSH/PULL METHOD
PURGE V2
V1
PURGE CLOSE
VALVE POSITIONS DURING SUB-
RECOVERY UNI
FILTER
POWER
SOURCE
POWER
SOURCE
OPTIONAL
CONNECTION
TO SYSTEM
VAPOUR
RECOVER
OPEN
V3
OPEN
13
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CO
T
VAL
CYLI
W
CT-
SC