Mueller E-Star OESE 3.5 and 5 HP HFC Condensing Unit
Installation and Operation Manual, Part No. 8828747
Effective April 13, 2020
12.5
LABEL NO. 8820155, WIRING CONNECTIONS FOR THREE-PHASE SCROLLS
12.6
LABEL NO. 8820156, BRIEF POWER INTERRUPTIONS
ON SCROLL SINGLE-PHASE COMPRESSORS
12.7
LABEL NO. 8822225, CE DATA TAG (UK MODELS ONLY)
12.8
LABEL NO. 31193, SCREEN INSIDE (IDENTIFIES SUCTION LINE SCREEN LOCATION)
26
1806
8820155
IMPORTANT!
Wiring Connections for Three-Phase Scrolls
Scroll compressors will only compress gas in the clockwise direction when viewed from the
top. Since single-phase motors will start and run in only one direction, reverse rotation is not
a major consideration. Three-phase motors will start and run in either direction depending on
the phase angles of the supplied power. This requires care during installation to ensure the
compressor is operating in the proper direction. Verification of proper rotation is done by
observing suction and discharge pressures when the compressor is energized. Reverse
rotation is indicated by a decrease in discharge pressure and an increase in suction pressure.
Reverse rotation has no negative impact on the scroll compressors. However, after several
minutes of operation the compressor-line break will de-energize the compressor. In order to
correct this, disconnect power and switch any two power leads at the unit contactor. Never
switch leads directly at the compressor.
1806
8820156
NOTE!
Brief Power Interruptions on
Scroll Single-Phase Compressors
Brief power interruptions of less than one-half second may result in powered reverse rotation
of single-phase scroll compressors. This occurs as a result of the high-pressure discharge gas
expanding backwards through the scroll at power interruption, causing the scroll to orbit in
the reverse direction. When power is reapplied while reverse rotation is occurring, the
compressor may continue to run noisily in the reverse direction for several minutes until the
compressor’s internal protector trips. This has no effect on durability. When the protector
resets, the compressor will start and run normally.
0408
8822225
Year of Construction
Année de fabrication
Año de fabricación
Model Number
Numéro de modèle
Número de modelo
Serial Number
Numéro de série
Número de serie
Noise Level
Niveau de bruit
Nivel de ruido
Weight
Poids
Peso
SCREEN INSIDE • SCREEN INSIDE • SCREEN INSIDE • SCREEN INSIDE
