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6.1 Compressor Requirements
The compressor is designed to meet the UL and
ASHRAE safety code for refrigeration compressors. The
manufacturing facilities for the compressor conduct pres-
sure burst tests in accordance with ASHRAE-15, UL
safety codes and the Pressure Equipment 97/23/CEE
directive.
6.2 Design Pressures
Pressure Relief Valve
The internal relief valve is designed to open when the
pressure
differential between suction and discharge pres-
sure is greater than 27.6 bar (400 psid) for R-134a and
greater than 30 bar (435 psid) for R-404A. The valve will
close and seal again after the pressure difference falls
below the set value.
Hydrostatic Design Pressures
The design pressures for the compressor castings are
listed in Table 17.
Table 17 — Compressor Design Pressures
LEGEND
LT — Low Temperature Refrigeration
NOTE:
All pressures listed are gage pressures. Add 14.7 psi (0.1 MPa)
to obtain absolute pressure, if necessary.
PRESSURE TYPE APPLICATION DISCHARGE ECONOMIZER SUCTION
Hydrostatic Burst
Test Pressure (BURST)
R-134a Water-Cooled 950 psig (6.6 MPa) 540 psig (3.7 MPa) 440 psig (3.0 MPa)
R-134a Air-Cooled 1470 psig (10.1 MPa) 610 psig (4.2 MPa) 440 psig (3.0 MPa)
R-404A LT Ref 1770 psig (12.2 MPa) 1040 psig (7.2 MPa) 870 ps
ig (6.0 MPa)
Proof Test Pressure (TP)
R-134a Water-Cooled
465 psig (3.2 MPa)R-134a Air-Cooled
R-404A LT Ref
Maximum Operating
Pressure (MOP)
R-134a Water-Cooled 190 psig (1.3 MPa) 108 psig (0.7 MPa) 61 psig (0.4 MPa)
R-134a Air-Cooled 294 psig (2.0 MPa) 122 psig (0.8 MPa) 51 psig (0.4 MPa)
R-404A LT Ref 354 psig (2.4 MPa) 116 psig (0.8 MPa) 38 psig (0.3 MPa)
Leak Test Pressure
(AP)
R-134a Water-Cooled
310 psig (2.1 MP
a)R-134a Air-Cooled
R-404A LT Ref
UL60335-2-34 Design
Pressure (DP)
R-134a Water-Cooled 190 psig (1.3 MPa) 108 psig (0.7 MPa) 88 psig (0.6 MPa)
R-134a Air-Cooled 294 psig (2.0 MPa) 122 psig (0.8 MPa) 88 psig (0.6 MPa)
R-404A LT Ref 354 psig (2.4 MPa) 116 psig (0.8 MPa) 176 psig (1.2 MPa)
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