Figure 20

High Pressure Protection Devices

Scroll Compressors

PGC 24, 30, 36, 42, 60, and PGB58 units include scroll compressors. The installer and servicer should be aware of the following differences between scroll compressors and reciprocating compressors:

•These scroll compressors include a thermostat (ex- ternal compressor protector) mounted to the top of the compressor. THIS PROTECTIVE DEVICE SHOULD NEVER BE BYPASSED FOR ANY PUR- POSE.

•On a scroll compressor, due to its inherent ability to handle liquid refrigerant, a crankcase heater is not required.

CAUTION

To avoid severe personal injury or fire, refrigerant must be removed from both the low and the high pressure sides of the system before heat is applied.

•The scroll compressors use white oil which is com- patible with 3GS. If the addition of oil in the field is required, 3GS may be used .

Important Note: Never close the compressor suction line to test its pumping efficiency. This will seriously dam- age the compressor and void its warranty.

•The compressor may run backwards (noisy opera- tion) for 1 or 2 seconds at shutdown. This does not harm the compressor.

•These scroll compressors have copper plated steel suction tubes. If removal and reconnection becomes necessary, use silfos with minimum 5% silver or sil- ver braze material with flux.

•Operating pressures and current draws may differ from standard reciprocating compressors. See Sec- tion XV for typical cooling performance data.

Reciprocating Compressor

The PGC48 includes a reciprocating compressor with a crankcase heater. See the caution for the PGC48 be- fore starting cooling operation.

CAUTION

To avoid severe personal injury or fire, refrigerant must be removed from both the low and the high pressure sides of the system before heat is applied.

Operating Instructions (cooling)

CAUTION

On PGC48 Only: To avoid damage to the compressor, engage the electrical dis- connect switch to the compressor unit four hours prior to operating air condi- tioner after the electrical disconnect is off for a prolonged period of time (during vacation, etc.). This time lapse allows the compressor crankcase to attain a proper operating temperature.

(NOTE: Mechanical cooling cannot be reliably provided at ambient temperatures below 50° F. If low ambient cooling will be required a downflow economizer is avail- able. See Section XIV.)

1.Turn on the electrical power supply to the unit.

2.Place the room thermostat selector switch in the COOL position (or AUTO if available, and if auto- matic changeover from cooling to heating is desired).

3.Set the room thermostat to the desired temperature.

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Amana PGB58B, PGC(24-60)B High Pressure Protection Devices, Scroll Compressors, Reciprocating Compressor
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PGB58B, PGC(24-60)B specifications

Amana, a trusted name in heating and cooling, offers several high-efficiency gas furnace models, including the PGC(24-60)B and PGB58B. These furnaces combine innovation, reliability, and advanced technology to provide an optimal heating solution for any home.

One of the standout features of the Amana PGC(24-60)B is its modulating heating capability. This technology allows the furnace to operate at different heating levels based on the home’s demands. Instead of simply turning on and off, the PGC adjusts its output to maintain a consistent temperature, promoting energy efficiency and comfort. This not only reduces energy consumption but also minimizes temperature fluctuations, providing a more comfortable indoor environment.

The PGB58B model is designed with a focus on efficiency, boasting an Annual Fuel Utilization Efficiency (AFUE) rating of up to 96%. This means that a higher percentage of the fuel used is converted into heat, making it one of the most efficient choices available. The combination of high-efficiency design and advanced components makes the PGB58B an excellent option for homeowners looking to reduce their energy bills while enjoying reliable heating performance.

Both models come equipped with a durable casing, ensuring longevity and performance. The rust-resistant and heavy-gauge steel construction protects against harsh weather conditions, making them suitable for various climates. Additionally, they feature a multi-speed blower motor, which optimizes airflow and enhances comfort by evenly distributing warm air throughout the home.

Advanced diagnostics and self-monitoring capabilities are integral to these models. The built-in diagnostic system enables quick identification of performance issues, allowing for timely maintenance and reducing repair costs. Furthermore, these furnaces are designed to be compatible with smart home technology, allowing homeowners to control their heating systems remotely and maximize energy efficiency.

In summary, the Amana PGC(24-60)B and PGB58B gas furnaces stand out for their innovative features and commitment to energy efficiency. With modulating heating, high AFUE ratings, durable construction, and smart technology compatibility, they offer reliable heating solutions that ensure comfort while keeping energy costs low. Homeowners can feel confident in their investment, knowing they have chosen a furnace that prioritizes both performance and sustainability.
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