MasterCool 69500 Operating Instructions Manual page 3

STEP #1
Evacuate hoses used on recovery/recycle system to remove air and moisture. This operation must be done before
recovery or charging of refrigerant.
1. Connect recycle module, A/C system, DOT recovery tank, scale for use with recovery tank and recovery machine
"figure 1".
2. Open "valves 1, 2, 10, 11, 15 and 16", inlet and outlet valve on recovery machine, and valve on vacuum pump (if
equipped). Do not open valves on DOT tank or A/C system. Turn on vacuum pump. Hoses and recovery/recycle system
will be evacuated of air, moisture and any residual gases. When using Mastercool Recovery Machine, turn yellow
middle knob on recovery machine to "purge" position. This will accelerate evacuation of recovery machine.
3. When sufficient vacuum has been produced shut off "valve 1" and valve on vacuum pump (if equipped), turn off
vacuum pump.
STEP #2
Recover refrigerant from A/C system. Use this step if refrigerant is known to be in A/C system.
1. Connect system per "figure 1". Evacuate system per STEP #1.
2. Open both high and low pressure valves on A/C system.
3. Open vapor "valve 6" on DOT tank.
Note: Fill DOT recovery tank to a maximum of 80% by weight. Use scale with DOT tank to insure a maximum of
80% full.
4. Start recovery machine. Refrigerant (liquid and/or vapor) will flow out of A/C system high and low ports through recycle
module, through recovery machine and into DOT tank. Recovery machine will shut off when sufficient vacuum is
achieved in A/C system (about -10 to -14 inches of HG, -.3 to -.45 bar).
5. Switch recovery machine to purge mode and operate until machine shuts off under vacuum conditions. Maximum
amount of refrigerant that can be removed from system by using recovery system is now complete.
STEP #3
Create high vacuum in A/C system (prepare for refrigerant charging). If any refrigerant is in A/C system complete step
#2 before starting step #3.
1. Connect system per "figure 1". Evacuate system per STEP #1.
2. Open high and low pressure valves on A/C system.
3. Turn on vacuum pump. Open "valve 1" and valve on vacuum pump (if equipped).
4. After a high vacuum is achieved close "valve 10". Continue running vacuum pump until very high vacuum is achieved.
5. Close high and low pressure valves on A/C system.
6. Close "valve 1" and vacuum pump valve (if equipped). Turn off vacuum pump.
STEP #4
Charging of A/C system with liquid refrigerant. Make sure system allows charging with liquid refrigerant. Check and
make sure A/C system has been evacuated or refrigerant in A/C system is the same as charging refrigerant.
1. Connect system per "figure 1" if A/C system can be charged with liquid refrigerant into high side connection. If A/C
system is to be completely charged, complete STEPS #1, #2 and #3 and then continue to number 2. If system is to
have refrigerant added to existing charge, complete STEP #1 only, then continue to number 2.
2. Dot tank should be installed on a scale to monitor the amount of refrigerant being put into A/C system. Close "valve
10". Open high and low side valve on A/C system. Refrigerant may or may not flow thru sight glass at this time
depending on temperature and pressure of A/C system.
3. Check scale weight for amount of refrigerant in DOT tank. Record weight to use later in determining amount of
refrigerant that has gone into A/C system. Open "valve 10". Close "manifold inlet valve 16". Open "valves 6 and 7" on
dot tank. Turn on recovery machine. Check scale for amount of refrigerant going from dot tank to A/C system.
4. When proper amount of refrigerant has been added close "valve 7", low side and high side valve on A/C system.
Continue to run recovery machine. Recovery machine will shut off when vacuum level on inlet of recovery machine
reaches the proper vacuum reading. Open "manifold inlet valve 16" and recovery machine will start and run until
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