Carrier AquaEdge 19DV Series Start-Up, Operation And Maintenance Instructions Manual page 24

All 19DV units are field charged. Charge the unit from refriger-
ant cylinders. Use Tables 8 and 9 to find expected approximate
charge by adding evaporator and condenser charge together. Re-
fer to unit nameplate and E-Cat output for certified values.
Prior to charging ensure the following:
1. Standing vacuum test completed.
2. Only initiate refrigerant charging into a deep vacuum.
3. Adequate refrigerant supply is available as per unit name-
plate.
CAUTION
Do not apply power to the VFD or motor when in a dehy-
dration vacuum because it will result in equipment damage.
With water pumps running, connect charging hose from refrig-
erant cylinder to chiller evaporator charging valve. Start with
EVAPORATOR REFRIGERANT
HX WT [lbs]
G20 through
700
G2K
G40 through
840
G4K
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* The economizer factor for Frame G, H is 342 lbs, so for example the charge for
a G20 evaporator coupled with G22 condenser is:
700 lbs + 413 lbs + 342 lbs = 1455 lbs
Table 8 — Refrigerant Charge — English (lbs)
G
REFRIGERANT
CONDENSER
WT [lbs]
G22, G27, G2C,
413
G2H
G23, G28, G2D,
405
G2J
G24, G29 402
G2E, G2K 397
G42, G47, G4C,
468
G4H
G43, G48, G4D,
458
G4J
G44, G49 455
G4E, G4K 448
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charging gas until the pressure is greater than the above satura-
tion pressure temperature to avoid refrigerant flashing and po-
tential tube freezing. Once required pressure is reached, switch
over to charge liquid either by lifting refrigerant cylinder above
charging valve to allow for gravity feed or, if charge is isolated
in storage tank, by using pumpout equipment suited for low
pressure refrigerant.
After the machine has been started, adjust charge for optimum
machine performance. Operate the chiller at design load and
then add or remove refrigerant slowly until the difference be-
tween the leaving chilled water temperature and the evaporator
refrigerant temperature reaches design conditions or becomes a
minimum. Do not overcharge.
Use the evaporator sight glass (see Fig. 20) to determine the
correct refrigerant at all times. During steady state operation at
full load, the boiling pool tubes under compressor suction
should be covered with liquid refrigerant. There is no benefit to
a refrigerant liquid level higher than the tubes.
DV4
EVAPORATOR REFRIGERANT
HX WT [lbs]
H20, H25 741
H21, H26 752
H22, H27 763
H23, H28 778
H24, H29 792
H2A, H2F 700
H2B, H2G 707
H2C, H2H 716
H2D, H2J 726
H2E, H2K 736
H40, H45 841
H41, H46 853
H42, H47 866
H43, H48 883
H44, H49 900
H4A, H4F 795
H4B, H4G 803
H4C, H4H 813
H4D, H4J 824
H4E, H4K 836
24
*
H
REFRIGERANT
CONDENSER
H22, H27
H23, H28
H24, H29
H2C, H2H
H2D, H2J
H2E, H2K
H42, H47
H43, H48
H44, H49
H4C, H4H
H4D, H4J
H4E, H4K
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—
—
—
—
—
—
WT [lbs]
484
495
507
431
439
448
563
576
590
499
508
518
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