Carrier Ð Typical 30HXA Refrigerant Piping to Remote Condenser, Saturated Temperature Example

NOTES:

1.Piping shown is for general point-of-connection only and is not in- tended to show details for a speci®c installation. Certi®ed ®eld wir- ing and dimensional drawings are available upon request. The 30HXA units should be installed using certi®ed drawings.

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

3.Piping and pressure relief devices are ®eld supplied.

4.Vent pipes properly per local codes.

COOLER*

EXV

OIL SEPARATOR

ANGLE

VALVE

EXV

LIQUID LINE

LIQUID LINE

TO REMOTE

CONDENSER(S)

TO REMOTE

CONDENSER(S)

TO REMOTE

CONDENSER(S)

TO REMOTE

CONDENSER(S)

PRESSURE

RELIEF

DISCHARGE

LINE

LEGEND

EXV Ð Electronic Expansion Valve *See Fig. 6 for typical cooler piping.

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

30HXA REFRIGERANT PIPING (See Fig. 7) Ð 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 Ð Discharge Line 2 F (1.1 C) Drop in

Saturated Temperature Example

SATURATED				PRESSURE
DISCHARGE
	TEMP		R-134a		R-22
F		C	Psig	kPa	Psig	kPa
126		52.2	187.5	1293	281.6	1942
124		51.1	182.0	1255	274.3	1891
D PRESSURE			5.5	38	7.3	51

LEGEND

COM Ð Common

N.O. Ð Normally Open

Fig. 8 Ð Differential Flow Switch

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