Carrier 30HXA,HXC076-186 Water-Cooled and Condenserless Chillers User Manual

Page 11

30HXA REFRIGERANT PIPING (See Fig. 7) — Take
care when running the refrigerant piping from the 30HXA
unit to the remote condenser(s) to avoid excessive pres-
sure drops. The pressure drop using R-134a refrigerant is
different than when using R-22 refrigerant. See Tables 2 and
3 for an example for a 2 F (1.1 C) pressure drop in saturated
temperature in the discharge (hot gas) line and liquid line,
respectively. Refer to Fig. 9 and 10 for line sizing informa-
tion for the discharge and liquid lines for 30HXA (R-134a)
units.

Table 2 — Discharge Line 2 F (1.1 C) Drop in

Saturated Temperature Example

SATURATED
DISCHARGE

TEMP

PRESSURE

R-134a

R-22

Psig

kPa

Psig

kPa

126

52.2

187.5

1293

281.6

1942

124

51.1

182.0

1255

274.3

1891

⌬

PRESSURE

5.5

7.3

PRESSURE
RELIEF

DISCHARGE
LINE

LIQUID LINE

ANGLE
VALVE

OIL
SEPARATOR

COOLER*

TO REMOTE
CONDENSER(S)

EXV

Fig. 7 — Typical 30HXA Refrigerant Piping to Remote Condenser

NOTES:
1. Piping shown is for general point-of-connection only and is not in-

tended to show details for a specific installation. Certified field wir-
ing and dimensional drawings are available upon request. The 30HXA
units should be installed using certified drawings.

2. Refer to Carrier System Design Manual for details regarding pip-

ing techniques.

3. Piping and pressure relief devices are field supplied.
4. Vent pipes properly per local codes.

LEGEND

EXV — Electronic Expansion Valve

*See Fig. 6 for typical cooler piping.

LEGEND

COM — Common
N.O.

— Normally Open

Fig. 8 — Differential Flow Switch