Mueller E-Star OESE 3.5 and 5 HP HFC Condensing Unit
Installation and Operation Manual, Part No. 8828747
Effective April 13, 2020
FIGURE 2: REFRIGERANT PIPING SCHEMATICS
IMPORTANT: When charging the system with liquid refrigerant, always charge upstream of the
accumulator heat exchanger (access ports P2) to ensure the compressor is protected against damage
caused by liquid refrigerant slugging.
9
Subcooling Loop
Fan
Scroll Compressor
Ambient Air
Receiver
This is a custom-designed
accumulator heat exchanger.
To ensure proper system
operation, a genuine Mueller
accumulator heat exchanger
must be used.
Accumulator
Heat Exchanger
Fan
Control
FP
(Off-Cycle)
HP
LP
T1: Product Temperature
Liquid Refrigerant
Liquid-Vapor Refrigerant
Vapor Refrigerant
T2
P3
P4
P2
P6
T4
T6
T3
T5
P5
P1
DFE0117
60 psig
40°F
T7
Example (R-507):
• 60 psig converted to saturation temperature on
refrigerant pressure temperature table equals 34°F.
• Actual suction line temperature equals 40°F.
Results:
• 40°F – 34°F = 6°F (4.4°C – 1.1°C = 3.3°C)
superheat at evaporator.