Type Of Oil Recommended With Maneurop Compressors; Type Of Oil Recommended With Sanyo Compressors; Type Of Oil Recommended With Scrolltech - Trane MERCURY EDAB 1105A Technical Manual

Mercury close control unit

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Table Of Contents

Table of Contents

Evacuation of the refrigeration circuit and charging of refrigerant

WARNING! The charging and maintenance of the refrigeration circuit must only be carried out by a

qualified hydraulic technician.

The refrigeration circuit is pre-charged with nitrogen.

To load the refrigerant, carry out the following procedure:

R410A

•

open any shut-off valves present in the machine to

ensure that all of the components will be evacuated;

•

connect a pump to empty the schrader connections

efficiently, or to the 1/4» SAE connections present on

the intake and delivery sides of the compressors;

•

connect the refrigerant cylinder to the loading

connections;

•

create a vacuum within the lines whilst maintaining the

pressure below 10 Pa absolute (0,07 mm Hg) for a long

time in order to evacuate the air as well as any trace

of humidity. It is preferable that the vacuum is reached

slowly and maintained for a long period of time;

•

wait for a build up period of 100 seconds and check

that the pressure has not exceeded 200 Pa absolute.

Generally, in the case of suspicion of strong hydration

of the circuit or an extremely extensive system, it will

be necessary to break the vacuum with anhydrous

nitrogen and then repeat the evacuation procedure as

described;

•

break the vacuum by performing a preload in liquid

phase from the R410A coolant cylinder;

•

after having started the compressor, slowly complete

the loading phase until the pressure within the lines

has been stabilised and the gaseous bubbles have

disappeared from the flow sight glass;

•

the loading process must be controlled in environmental

conditions with a delivery pressure of approximately

18 bar (equivalent to a dew temperature of 48 °C and

a bubble temperature of 43 °C); in the case of units

with ON/OFF condensation controls, avoid switching

the condenser fan on and off, which may partially

obstruct the intake surface. It is wise to check that the

sub-cooling of the liquid at the entry of the thermostatic

valve is between 3 and 5 °C below the condensation

temperature read on the scale of the pressure gauge

and that the overheating of the vapour at the exit of the

evaporator is equal to approximately 5-8 °C.