Charge Unit With Refrigerant - Carrier 19DV Series Installation, Operation And Maintenance Instructions

5.7 Charge unit with refrigerant

Standard 19DV is shipped with refrigerant but it can also be shipped with holding nitrogen charge of 103 kPa.
Chiller has to be loaded on job site with refrigerant.
IMPORTANT: Turn on the chilled water and condenser water pumps to prevent freezing.
CAUTION: Always operate the condenser and chilled water pumps whenever charging, transferring, or removing
refrigerant from the chiller. Always confirm that water flow is established.
Failure to follow this procedure may result in equipment damage.
CAUTION: The transfer, addition, or removal of refrigerant in spring isolated chillers may place severe stress on
external piping if springs have not been blocked in both up and down directions. Failure to block springs in both up
and down directions could result in severe personal injury and equipment damage.
CAUTION: Always operate the condenser and chilled water pumps during charging operations to prevent freeze-
ups. Damage could result to equipment if condenser and chilled water pumps are not operated during pumpdown or
charging.
WARNING : Always charge refrigerant gas into unit until pressure exceeds water freeze temperature using
PUMPDOWN/ LOCKOUT (located in the Maintenance menu) and TERMINATE LOCKOUT mode on the PIC5+.
Cooler and condenser water pumps must be running to prevent tube freezing.
For R-1233zd(E) water freeze point is exceeded at -15 in. Hg (-51 kPa).
Charge the unit from refrigerant cylinders. Use Table 18 to find expected approximate charge by adding cooler
and condenser charge together. Refer to unit nameplate and E-Cat output for certified values.
Prior to charging ensure the following:
a. Standing vacuum test completed
b. Only initiate refrigerant charging into a deep vacuum
c. Adequate refrigerant supply is available as per unit nameplate. With water pumps running, connect charging
hose from refrigerant cylinder to chiller cooler charging valve. Start with charging gas until the pressure is greater
than the above saturation pressure temperature to avoid refrigerant flashing and potential tube freezing. Once
required pressure is reached switch over to charge liquid by either lifting refrigerant cylinder above charging valve
to allow for gravity feed or if charge isolated in storage tank 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 between the leaving chilled water
temperature and the cooler refrigerant temperature reaches design conditions or becomes a minimum. Do not
overcharge. Use the cooler sight glass 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.
Compressor frame size
DV4
Condenser HX designation
G22, G27, G2C, G2H
G23, G28, G2D, G2J
G24, G29
G2E, G2K
G42, G47, G4C, G4H
G43, G48, G4D, G4J
G44, G49
G4E, G4K
Table 18 – refrigerant charge
Evaporator HX designation
G20, G21, G22, G23, G24, G25,
G26, G27, G28, G29,G2A,
G2B, G2C, G2D, G2E, G2F, G2G,
G2H, G2J, G2K
G40, G41, G42, G43, G44, G45,
G46, G47, G48, G49,G4A,
G4B, G4C, G4D, G4E, G4F, G4G,
G4H, G4J, G4K
R-1233zd(E)
charge (+/- 11kg)
660
656
655
653
748
744
743
740
77