15
14
EN
5.0 SET UP AND OPERATION continued
5.5 COOLING THE RECOVERY CYLINDER
5.5.1 The recovery unit can be used to PRE-cool (or SUB-cool) the recovery cylinder if the head
pressure is too high to complete the recovery process. This can occur when working with certain
refrigerants with a high vapour pressure in high ambient temperatures.
5.5.2 If the recovery process stalls out because of high head pressure, stop the recovery unit, shut
off the hose valves and reconfigure the setup as shown below. This can also be done before starting
the recovery process but it may have marginal long term effect. NOTE: This will only work if there is at
least 5 Kg of liquid in the recovery cylinder to develop the necessary pressure differential required.
5.5.3 POWER ON the recovery unit and ROTATE the DISCHARGE Valve (V3) to achieve a pressure
differential of at least 700 Kpa between the LP Gauge and the HP Gauge. KEEP THE HP BELOW
2500 Kpa on the HP Gauge to ensure that the HP Cut-Off Switch will not actuate.
5.5.4 After several minutes of running, the cylinder will be cold. POWER OFF the recovery unit and
reconfigure the setup for NORMAL RECOVERY. Repeat as needed.
SET-UP PROCEDURE FOR SUB-COOLING METHOD
RECOVERY UNIT
POWER
SOURCE
OPTIONAL
CONNECTION
TO SYSTEM
CYLINDER
WITH
CT-OFD
SCALE
VAPOUR
LIQUID
RECOVERY UNIT
VAPOUR
VAPOUR
LIQUID
SYSTEM
POWER
SOURCE
FILTER
CYLINDER
WITH
CT-OFD
SCALE
LIQUID
RECOVERY UNIT
LIQUID
CYLINDER
SCALE
POWER
SOURCE
RECOVERY UNIT
VAPOUR
LIQUID
LIQUID
SYSTEM
CYLINDER
WITH
CT-OFD
SCALE
POWER
SOURCE
FILTER
VALVE POSITIONS FOR PUSH/PULL METHOD
V2
LIQ
UID
OPEN
CLOSE
PURGE
PURGE
RECOVER
OPEN
V3
V1
VALVE POSITIONS DURING PURGE OPERATION
V2
LIQ
UID
V1
CLOSE
OPEN
CLOSE
PURGE
PURGE
RECOVER
OPEN
V3
VALVE POSITIONS DURING SUB-COOLING METHOD
V2
LIQ
UID
V1
CLOSE
OPEN
CLOSE
PURGE
PURGE
RECOVER
OPEN
V3
VALVE POSITIONS DURING NORMAL RECOVERY
V2
LIQ
UID
V1
CLOSE
OPEN
CLOSE
PURGE
PURGE
RECOVER
OPEN
V3
RECOVERY UNIT
POWER
SOURCE
OPTIONAL
CONNECTION
TO SYSTEM
CYLINDER
WITH
CT-OFD
SCALE
VAPOUR
LIQUID
RECOVERY UNIT
VAPOUR
VAPOUR
LIQUID
SYSTEM
POWER
SOURCE
FILTER
CYLINDER
WITH
CT-OFD
SCALE
LIQUID
RECOVERY UNIT
LIQUID
CYLINDER
SCALE
POWER
SOURCE
RECOVERY UNIT
VAPOUR
LIQUID
LIQUID
SYSTEM
CYLINDER
WITH
CT-OFD
SCALE
POWER
SOURCE
FILTER
VALVE POSITIONS FOR PUSH/PULL METHOD
V2
LIQ
UID
OPEN
CLOSE
PURGE
PURGE
RECOVER
OPEN
V3
V1
VALVE POSITIONS DURING PURGE OPERATION
V2
LIQ
UID
V1
CLOSE
OPEN
CLOSE
PURGE
PURGE
RECOVER
OPEN
V3
VALVE POSITIONS DURING SUB-COOLING METHOD
V2
LIQ
UID
V1
CLOSE
OPEN
CLOSE
PURGE
PURGE
RECOVER
OPEN
V3
VALVE POSITIONS DURING NORMAL RECOVERY
V2
LIQ
UID
V1
CLOSE
OPEN
CLOSE
PURGE
PURGE
RECOVER
OPEN
V3
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