SYSTEMP – Installation Operation Manual (IOM SYSTEMP rev.N)

Table Of Contents
60
9.9.5 CHECK OF CORRECT LUBRICATING OIL LOAD AND EVENTUAL CIRCUIT TOP-UP
It is always necessary to check whether lubricating oil needs to be added to the cooling circuit. The quantity of lubricating
oil depends on the total refrigerant load and system characteristics. To determine whether or not the cooling circuit needs to be
topped up with lubricating oil, the following formula can be used
TOP UP OIL (l) = (CIRCUIT OIL CONTENT (l) + OIL TRAP CONTENT (l)) - INITIAL COMPRESSOR
CONTENT (l)
Example calculation for a system with P series units, model 251, TMC 35 with LAC valve, with inverter compressor and piping
with a vertical upright of 10 and total equivalent length of 40 m:
Initial content of lubricating oil in compressor: 1.7 l
Total refrigerant load: 15 kg R410a; oil content requested in the circuit: 15 ÷ 8 = 1.875 l
Number of oil traps: 2 x 7/8”; oil trap content: 2 x 0.027 = 0.054 l
Required top-up: (1.875+0.054) - 1.7 = 0.23 l
9.9.6 LUBRICATING OIL TOP-UP IN THE CIRCUIT
If the lubricating oil in the compressor must be topped up, there are 2 charging types that can be used:
OIL TOP-UP DURING THE VACUUM PHASE:
1) Connect a capillary to the air-cooled condenser.
2) Submerge the capillary in a container.
3) Fill the container with the amount of oil needed.
4) Connect the pressure gauge unit from the high pressure side.
5) Proceed with the vacuum operations from the high pressure side.
6) The oil will be drawn into the circuit.
7) Once charging is complete, proceed with the vacuum operations.
A Air-cooled condenser
B Pressure gauges
C Oil
D Vacuum pump
OIL TOP-UP WITH REFRIGERANT CHARGING CIRCUIT:
1) For topping-up use a specic pump.
2) Connect the pump to the air-cooled condenser through the appropriate emission valve .
3) Connect the specic capillary to the intake valve.
4) Submerge the capillary in a container.
5) Fill the container with the amount of oil needed.
6) Activate the pump for the oil to enter the circuit.
A Condenseur à air
B Oil pump
C Oil
A
B
D
C
A
B
C