Mueller E-Star OESE 7.5 and 9 HP HFC Condensing Unit
Installation and Operation Manual, Part No. 8828748
Effective June 16, 2020
6.1
ACCUMULATOR HEAT EXCHANGER FUNCTIONS
The accumulator heat exchanger performs several functions on the OESE system.
•
Additional Subcooling:
High-pressure liquid refrigerant from the condenser is subcooled 5–15°F (2.7–8.5°C)
as it passes through the heat exchanger coil in the bottom of the accumulator which is submerged in cold liquid
refrigerant that has returned from the evaporator.
•
Vapor Return to the Compressor:
The accumulator heat exchanger evaporates accumulated liquid
returning from the evaporator, providing cool vapor refrigerant to the suction inlet of the compressor.
•
Oil Return to the Compressor:
Oil settles to the bottom of the accumulator and is returned to the
compressor through an orifice in the accumulator’s suction outlet.
IMPORTANT: The custom Mueller accumulator heat exchanger utilizes a special “pancake” heat
exchange coil. The use of a generic (spiral) accumulator heat exchanger will severely reduce cooling
capacity of the E-Star OESE condensing unit and may cause premature compressor failure. Use genuine
Mueller replacement parts only.
FIGURE 5: ACCUMULATOR HEAT EXCHANGER
12
Section 6.0 – Accumulator Heat Exchanger
1
5
∕
8
" Suction Connections
7
∕
8
" Liquid Connections
Fuseable Plug
Oil Return Orifice