Mueller E-Star OESE 3.5 and 5 HP HFC Condensing Unit
Installation and Operation Manual, Part No. 8828747
Effective April 13, 2020
3.1
EPA REFRIGERANT REGULATIONS
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Mueller E-Star OESE condensing units are designed to operate with R-507 refrigerant. R-507 is specified by the
ASHRAE Standard 34 Safety Classification as an A-1 refrigerant with low-flame propagation and low toxicity.
EPA regulations require that any technician performing refrigerant installation or service on a high-pressure
appliance be certified as a Type II Technician in accordance with Section 608 of the Clean Air Act.
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As adopted for the United States and Canada. These regulations may change or differ for your locality. It is the responsibility of the
technician performing the refrigerant service and/or installation to abide by all regulatory requirements for the installation locality,
state, and country.
3.2
INITIAL REFRIGERANT CHARGE
IMPORTANT: E-Star OESE condensing units must be triple evacuated to 500 microns before refrigerant
charging.
The most efficient and reliable method to charge the condensing unit is to weigh in the charge, ensuring it matches
the startup charge recommendations in Table 6. Section 3.3 outlines the weigh-in procedure.
IMPORTANT: The recommended startup charge is only an initial charge; more refrigerant may be
necessary to have a properly charged system. Refer to Section 3.3 for final charge information.
TABLE 6: RECOMMENDED STARTUP REFRIGERANT CHARGE
NOTE:
R-507 is recommended for use with E-Star OESE condensing units. Other refrigerants may be compatible;
contact Paul Mueller Company’s Dairy Farm Equipment Service Department for more information.
3.3
WEIGH-IN REFRIGERANT CHARGING
The following steps outline the procedure to weigh in the refrigerant startup charge. Refer to the refrigerant piping
schematic shown in Figure 2.
1. With a clean, evacuated system, connect the manifold gauges to the suction service valve (P2) and the high-
side service valve (P6).
2. Connect the center charging hose to a cylinder of new or reclaimed ARI 700-88 specifications refrigerant.
3. Weigh and record the gross weight of the refrigerant cylinder.
4. Purge any air from the manifold gauge hoses, as specified by EPA Section 608, de-minimus release.
5. Break the refrigeration system’s vacuum with liquid refrigerant, charging into the Schrader port at the suction
service valve (P2).
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Section 3.0 – Refrigerant Charging
Condensing Unit Size
Recommended Startup Charge
Milk Cooler
Chiller
3.5 HP
13.5 lbs / 6.12 kg
11.5 lbs / 5.22 kg
5 HP
15 lbs / 6.8 kg
13 lbs / 5.9 kg
