WARNING

ELECTRIC SHOCK HAZARD

Turn off electric power before service or installation.

Extreme care must be used, if it becomes necessary to work on equipment with power applied.

Failure to do so could result in serious injury or death.

WARNING

HIGH PRESSURE HAZARD

Sealed Refrigeration System contains refrigerant and oil under high pressure.

Proper safety procedures must be followed, and proper protective clothing must be worn when working with refrigerants.

Failure to follow these procedures could result in serious injury or death.

Undercharged Refrigerant Systems

A check of the amperage drawn by the compressor

An undercharged system will result in poor performance

motor should show a lower reading. (Check the Unit

(low pressures, etc.) in both the heating and cooling

Specification.) After the unit has run 10 to 15 minutes,

cycle.

check the gauge pressures. Gauges connected to system

Whenever you service a unit with an undercharge of

with an undercharge will have low head pressures and

substantially low suction pressures.

refrigerant, always suspect a leak. The leak must be

 

 

 

repaired before charging the unit.

 

 

 

 

 

 

To check for an undercharged system, turn the unit on,

 

 

 

allow the compressor to run long enough to establish

 

 

 

working pressures in the system (15 to 20 minutes).

 

 

 

During the cooling cycle you can listen carefully at the exit

 

 

 

of the metering device into the evaporator; an intermittent

 

 

 

hissing and gurgling sound indicates a low refrigerant

 

 

 

charge. Intermittent frosting and thawing of the evaporator

 

 

 

is another indication of a low charge, however, frosting

 

 

 

and thawing can also be caused by insufficient air over

 

 

 

the evaporator.

 

 

 

Checks for an undercharged system can be made at

 

 

 

 

 

 

the compressor. If the compressor seems quieter than

 

 

 

normal, it is an indication of a low refrigerant charge.

 

 

 

Overcharged Refrigerant Systems

of the evaporator will not be encountered because the

Compressor amps will be near normal or higher.

refrigerant will boil later if at all. Gauges connected to

system will usually have higher head pressure (depending

Noncondensables can also cause these symptoms. To

upon amount of over charge). Suction pressure should be

confirm, remove some of the charge, if conditions improve,

slightly higher.

system may be overcharged. If conditions don’t improve,

 

 

 

Noncondensables are indicated.

 

 

 

Whenever an overcharged system is indicated, always

 

 

 

make sure that the problem is not caused by air flow

 

 

 

problems. Improper air flow over the evaporator coil may

 

 

 

indicate some of the same symptoms as an over charged

 

 

 

system.

 

 

 

An overcharge can cause the compressor to fail, since it

 

 

 

would be “slugged” with liquid refrigerant.

 

 

 

The charge for any system is critical. When the compressor

 

 

 

is noisy, suspect an overcharge, when you are sure that

 

 

 

the air quantity over the evaporator coil is correct. Icing

 

 

 

 

 

 

 

21

Page 22 Page 24
Page 23
Image 23
Friedrich 2009, 2008 service manual Undercharged Refrigerant Systems, Overcharged Refrigerant Systems
Page 22 Page 24

2009, 2008 specifications

Friedrich 2008 and 2009 represent significant advancements in heating and cooling technology, particularly in the realm of air conditioning systems. Friedrich is known for producing robust and efficient HVAC solutions tailored for both residential and commercial applications. These models are particularly noteworthy for their innovative features and energy-efficient technologies that enhance user comfort and lower operational costs.

One of the main characteristics of the Friedrich 2008 and 2009 models is their emphasis on energy efficiency. Both units are designed to meet or exceed Energy Star standards, which indicates that they use less energy compared to standard models, contributing to greener living solutions. The incorporation of efficient compressors and high SEER (Seasonal Energy Efficiency Ratio) ratings ensures that users save money on their electricity bills while enjoying optimal cooling performance.

The units also feature advanced inverter technology, which allows for variable speed operation. This means that the system can adjust its cooling capacity based on the current temperature needs, resulting in more consistent comfort while reducing wear and tear on the equipment. Additionally, the inverter technology operates more quietly compared to traditional systems, making these models suitable for both home environments and commercial settings.

Friedrich 2008 and 2009 also provide users with enhanced control options. The inclusion of smart technology and Wi-Fi connectivity allows for remote monitoring and temperature adjustments via smartphones or tablets. Users can create schedules, set temperature preferences, and receive maintenance alerts, contributing to a more user-friendly experience.

Moreover, these models are designed with robust construction, featuring durable materials that withstand various weather conditions. Their compact footprint and sleek design make them suitable for window installation, while an array of sizes accommodates spaces of different dimensions.

Additionally, the air filtration systems in Friedrich 2008 and 2009 units improve indoor air quality. They effectively capture dust, allergens, and other particulates, ensuring a healthier environment for occupants.

In summary, Friedrich 2008 and 2009 models stand out for their energy efficiency, innovative inverter technology, smart controls, and robust construction. With a focus on user comfort and environmental responsibility, these models provide reliable solutions for effective heating and cooling in diverse applications.
Top Page Image Contents