National Refrigeration Products LV5 User manual

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9.17.2018

MODEL LV5 REFRIGERANT RECOVERY UNIT
This unit is designed to recover both liquid and vapor refrigerant in a one-step process.
For use with Category III, IV, V Refrigerants
Including but not limited to R12, R22, R500, R502, 134A, and R410A
230V, 2 HP, 60 Hz, 20 AMPS
PRECAUTIONS
DO NOT OPERATE THE LV5 UNIT BEFORE READING THE OPERATING INSTRUCTIONS COMPLETELY.
ALWAYS WEAR RUBBER GLOVES AND SAFETY GOGGLES WHEN TRANSFERING REFRIGERANT.
EVACUATE THE LV5 BEFORE EACH REFRIGERANT RECOVERY PROCESS BY OPERATING IN “PUMP
OUT” MODE WITH THE INLET VALVE CLOSED AND THE OUTLET VALVEOPEN TO THE ATMOSPHERE.
PLEASE REFER TO PUMP OUT PROCEDURES ON PAGE 6.
EVACUATE CYLINDERS AND REFRIGERANT HOSES PRIOR TO THE REFRIGERANT RECOVERY
PROCESS TO 1000 MICRONS.
BEFORE EACH REFRIGERANT RECOVERY PROCESS ALWAYS USE A NEW FILTER-DRIER AT THE INLET
OF LV5 TO PROTECT THE COMPRESSOR, PRESSURE REGULATOR, AND SOLENOID VALVES. CHANGE
OUT OFTEN WHEN NECESSITATED - BURNOUTS, DIFFERENT REFRIGERANTS, ETC.
IT IS VERY IMPORTANT THAT THE OIL LEVEL IN THE COMPRESSOR BE CHECKED BEFORE EACH USE
AND CLOSELY MONITORED DURING EXTENDED PERIODS OF OPERATION. OIL SHOULD BE CHANGED
AFTER EACH REFRIGERANT RECOVERY PROCESS OR WHEN NECESSITED- BURNOUTS, DIFFERENT
REFRIGERANTS, AND ETC UNIT REQUIRES 34OZ. OF POE OIL.
REMOVE AND CLEAN THE INLET MESH STRAINER AFTER 20 HOURS OF OPERATION. IT IS LOCATED
ABOVE THE SIGHT GLASS ON THE INLET LINE.
WHEN NOT IN USE KEEP ALL VALVES IN THE CLOSED POSITION.THE LV5 IS JUST LIKE A
REFRIGERATION UNIT AND MUST NOT BE OPENED TO THE AIR SINCE MOISTURE WILL DAMAGE THE
COMPRESSOR.
ALWAYS USE A PROPERLY GROUNDED 230 VOLT, SINGLE PHASE, 60Hz OUTLET. DO NOT USE AN
EXTENSION CORD LONGER THAN 25 FEET. THE AMPERAGE DROP MAY DAMAGE THE MOTOR.
REFRIGERATION HOSES SHOULD NOT EXCEED 20 FEET IN LENGTH. ALWAYS USE 3/8” OR 1/2”'
DIAMETER HOSES FOR MAXIUM REFRIGERANT FLOW.
HIGH VOLTAGE IS PRESENT IN THE CONTROL COMPARTMENT AND UNDER NO CIRCUMSTANCES
SHOULD SERVICE BE ATTEMPTED ON THE LV5 WITHOUT FIRST DISSCONNECTING THE PLUG. FAILURE
TO DO SO COULD RESULT IN SEVERE INJURY OR DEATH.
LV5.DOC 09/17/2018 2

OVERVIEW- LV5 OPERATION
The LV5 removes both liquid and vapor refrigerant without resetting the unit. LV5 will transfer refrigerant liquid
directly at a rate of about 10 lbs. /min. It draws liquid refrigerant into the receiver which is on the suction side of
the LV5 compressor while discharging high pressure vapor into the other receiver. Before the suction receiver
gets full, solenoid valves switch the discharge through the LV5 condenser and into the recovery cylinder. The
solenoid valves switch the refrigerant path in sequence so each receiver fills with refrigerant then empties into
the recovery cylinder. The switching of the solenoid valves is controlled by floats (installed inside the receivers)
and a latching relay.
The unit has two sight glasses. The first sight glass is installed after the inlet valve and is for monitoring the
state (liquid/vapor) of the incoming refrigerant. The second sight glass is installed in the suction line near the
compressor and is to alert operators if liquid flows to the compressor. If this occurs the operation of the unit
must be stopped.
When all liquid is removed from the serviced system (the sight glass after inlet valve shows no liquid coming in)
the LV5 unit will recover vapor at a rate of about 1.2 lbs/min. The last portion of liquid, entering the LV5 unit,
will not activate the floats (inside the receivers) and switch the refrigerant path. This liquid will boil off gradually
while the compressor pulls vapor.
If the receiver containing the liquid becomes frozen and the recovery rate decreases press and release the
push button marked “LIQUID OUT” on the side corresponding to the frozen receiver. This will increase the
recovery rate.
NOTE: DO NOT DEPRESS BOTH PUSH-BUTTONS LABELED ‘LIQUID OUT’ AT THE SAME TIME. WHEN
UTILIZING DEPRESS AND RELEASE THE ‘LIQUID OUT’ BUTTON IMMEDIATELY, HOLDING BUTTON IN
MAY DAMAGE COMPRESSOR
The LV5 unit has a cylinder overfill protection feature. When using recovery cylinders with an automatic shut-
off (such as NRP# NC50U) turn the switch labeled (“AUTO-MAN”) to “AUTO” and connect the yellow cord to
the recovery cylinder. The LV5 will shut-off automatically at 80% of the cylinders capacity. When using a
recovery cylinder without the automatic shut-off feature turn the (“AUTO-MAN”) switch to “MAN”. Use a scale
to determine the weight of recovered refrigerant.
NOTE: NEVER OVERFILL CYLINDERS (THE MAXIMUM IS 80% OF CYLINDERS RATED CAPACITY
When the transfer of refrigerant is completed, from the serviced unit to the cylinder(s), the LV5 can pump out
any residual refrigerant left in its receivers or condenser. Since this procedure involves the transfer of
refrigerant directly into a recovery cylinder, without the benefit of a condenser, it is necessary to discharge
refrigerant into an evacuated cylinder.
NOTE: DISCHARGING HIGH PRESSURE REFRIGERANT INTO A WARM OR NEARLY FULL CYLINDER
MAY RESULT IN VERY HIGH PRESSURE WHICH CAN DAMAGE THE COMPRESSOR.
LV5.DOC 9/17/2018 3

Liquid and Vapor Recovery Method
1. Check the compressor oil level of the LV5 (it should cover half of the sight glass).
2. Make sure the inlet and outlet valves on the LV5 are closed.
3. Connect one side of a hose or manifold to the unit being serviced. Connect the other side to the valve
labeled “REFRIGERANT IN” on the LV5.
4. Connect a hose from the valve labeled “REFRIGERANT OUT” on the LV5 to the liquid valve of your
recovery cylinder.
5. Purge all the hoses.
6. Open the valve labeled “REFRIGERANT OUT” on the LV5. Open the liquid valve of the recovery
cylinder.
7. Plug in the unit to a 230-1-60 Hz outlet and switch to recovery mode.
NOTE: If you are recovering for the first time after pump-out or evacuation, slightly open the
valve labeled “REFRIGERANT IN” to break the vacuum inside the LV5. Close the valve labeled
“REFRIGERANT IN”. Wait ten (10) seconds. Go to the next step.
8. Slowly open the valve labeled “REFRIGERANT IN”.
9. Operate LV5 until all the refrigerant is recovered.
10. Turn off the LV5 and close all valves.
To achieve a deep vacuum (20” Hg or deeper) connect an evacuated recovery cylinder to the valve
labeled “REFRIGERANT OUT” on the LV5 unit at the end of the recovery process.
LV5. DOC 9/17/2018 4

External Push/Pull Liquid Recovery Method
Liquid refrigerant is transferred directly from the disabled unit to the recovery cylinder at a maximum
rate of 27 pounds per minute.
The LV5 pulls vapor from the top of the recovery cylinder. It compresses the vapor and pumps it into
the disabled unit. This maintains a lower pressure in the cylinder than in the disabled unit, which pulls
the liquid refrigerant into the cylinder.
1. Connect the disabled unit, cylinder, and recovery unit as shown in above Figure 2.
2. Purge all hoses.
3. Open both valves on the cylinder and both valves on the recovery unit.
4. Push the power switch into “RECOVERY” mode.
5. Refrigerant liquid can be seen through the sight glass connected to the liquid side of the
recovery cylinder.
6. When liquid transfer is complete or the cylinder is 80% full, turn off the recovery unit and close
the valves on the cylinder and the recovery unit.
NOTE: In some cases it may not be possible to recover the refrigerant in liquid form. There may not be
much liquid refrigerant or it has migrated to another part of the system. In this case the refrigerant will
have to be recovered in vapor form.
LV5. DOC 9/17/2018 5