General Safety; Operation - NAVAC MASTER Series User Manual

Recovery unit
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GENERAL SAFETY

Only authorized refillable refrigerant tanks can be used. It requires the use of recovery tanks with a minimum
working pressure of 652.6 psi (45 bar). Do not overfill the recovery tank, maximum at 80% capacity to make
sure that there is enough space for liquid expansion. Overfilling of the tank may cause a violent explosion.
Always wear safety goggles and protective gloves while working with refrigerants to protect your skin and
eye from hurting by refrigerant gases or liquid.
Do not use this equipment near flammable liquid or gasoline.
An digital scale is needed to prevent overfillinf.
Be sure that the place where you are working is thoroughly ventilated.
A
Notice
The middle fan runs when power is connected. All three fans run when the motor is on.
Be sure the unit is working under the right power supply.
When using an extension cord it should be minimum 14 AWG and no longer than 25 feet, otherwise it may
cause the voltage drop .
The input pressure of the unit should not exceed 377 psi ( 26 bar).
The unit need to be laid in horizontally, otherwise it will lead to unexpected vibration, noise or even abrasion.
Do not expose the equipment to sun or rain.
The ventilation opening of the unit must not be blocked.
If the overload protector pops, reposition it after 5 minutes.
When doing self purging operation, the knob must be turned slowly to "PURGE" to ensure the inlet pressure
is less than 72.5 psi (5 bar).
If fluid hammer happens in the recovery, please turn the knob slowly to "SLOW' position and do not let
reading pressure drop to zero.
When you select fast model to start work.please monitor output pressure, if the output pressure
increase fast to 391.6 psi ( 2 7bar),please turn to slow mode slowly and monitor the outlet
pressure not exceeding 507.6 psi(35barl ) .
The equipment is intended for serving air-conditionting and refrigeration systems containningmorethan 200
lbs of high-pressure refrigerant.
The tank and hose used must comply with the local regulations.
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OPERATION

1. Do not mix different refrigerants together in one tank, otherwise they could not be separated or used.
2. Before recovering the refrigerant, the tank should achieve the vacuum level: -29.6 inHg, for purge
non-condensable gases. Each tank was full of nitrogen when it was manufactured in the factory, thus the
nitrogen should be evacuated before first use.
3. The knob should be in the "Close" Position before operation. All the valves must be closed, the input
and output fittings should be covered with protective caps when the unit is not in operation. The
air/moisture is harmful to the recovery result and will shorten the life span of the unit.
4. A filter drier should always be used and should be replaced regularly. And each type of refrigerant
must have its own filter. For the sake of ensuring the normal operation of the unit, please use high
quality filter drier specified by our company. A high quality filter drier will help protect machine.
5. Special-caution is needed when recovering from system, and two dry filters are needed.
6. The unit has an Internal High Pressure protector. If the pressure inside the system is above rated
shut-off pressure (see specification), compressor will automatically shut off and the HP cutoff shows.
To restart the compressor, please lower the internal pressure (Output gauge indicates lower than
435 psi (30 bar) , after the HP cutoff blinks, then Press the "START" button to restart the compressor.
When high pressure protection initiates, please determine the cause and deal with it before restarting the unit.
CD The input v alve of the refrigerant tank is closed -opening the valve will help solve the problem.
® The connecting hose between the recovery unit and refrigerant tank is plugged --close all the
v alves and replace the connecting hose.
® The temperature of the refrigerant tank is too high, causing high pressure- cool the tank down.
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