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It is recommended that the oil charge should take place before the refrigerant charge. The above estimations of oil
charge can be used as guidelines. In case more oil need to be charged into the system after we have charge the
refrigerant a number of steps should be follow as shown below.
1
Stop the unit (switch off on controller)
2
Close valve 1 at the suction line
3
Vent gas from service ports S
(check on controller display)
4
Charge required amount of oil at valve 1 – use a manual stirrup pump
5
Evacuate from valve 2 and 3 & isolate gauge manifold
6
Slowly open valve 1 & remove gauge manifold when pressure is above 10 barg
7
Wait for 5 min
8
Restart the unit and check R744 level in the receiver
9
Top up R744 if necessary
Copyright HPL March 2021
n. 2
and n. 3
( 1/4 SAE)
until suction pressure drops near to
Page 25 of 172
0 barg
P4114S Rev 03
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