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8-21
62-11039
8.12.4 Adding Refrigerant To System (Full Charge)
NOTE
Place unit in Service Mode before performing
the following operations on the unit. Refer to
Section 5.2.3.
CAUTION
Do not vapor charge R--404A. Only liquid
charging through the receiver outlet (King)
valve is acceptable.
a. Dehydrate unit and leave in deep vacuum. (Refer to
section 8.10)
b. Place drum of refrigerant on scale and connect charg-
ing line from drum to king valve. Purge charging line at
outlet valve.
c. Note weight of drum and refrigerant.
d. Open liquid valve on drum. Open king valve half way
and allow the liquid refrigerant to flow into the unit until
the correct weight of refrigerant has been added as
indicated by scales. Correct charge will be found in
Table 2-1.
NOTE
It is possible that all liquid may not be pulled into
the receiver, as outlined in step d. In this case,
frontseat the receiver outlet valve (King Valve)
and run the unit in cooling until the correct
amount of refrigerant is added.
e. When drum weight (scale) indicates that the correct
charge has been added, close liquid line valve on
drum and backseat the king valve.
f. Start unit in cooling mode. Run approximately ten
minutes. Partially block off air flow to condenser coil
so discharge pressure rises to 15.8 bars (230 psig).
Refrigerant should appear at center line of lower receiv-
er sight glass.
8.13 ADDING REFRIGERANT TO SYSTEM
(PARTIAL CHARGE)
a. Start the unit in high speed diesel mode (ambient be-
tween 24
°
F (18
°
C) and 86
°
F (30
°
C) with a setpoint of
68
°
F (20
°
C) or lower.
b. When return air reaches 32
°
F (0
°
C), check the sight
glasses.
c. If the bottom ball is floating at the top of the sightglass
and the top ball is not floating, the charge is correct.
d. Liquid charge through the suction service valve.
Содержание VECTOR 1800 MT
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Страница 310: ...10 8 62 11039 BASED ON ENGINEERING SCHEMATIC 62 60926 REV G NEXT SHT ...
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