Tandem Allied Services AC Technician Interview Questions, Process, and Tips

VCRS cycling is the process of a variable capacity refrigeration system adjusting its cooling output based on demand.

• VCRS cycling is used in HVAC systems to improve energy efficiency and reduce operating costs.

• The system adjusts the compressor speed to match the cooling demand, rather than running at full capacity all the time.

• This results in more precise temperature control and less wear and tear on the system.

• For exa...read more

Air cooled chillers use air to remove heat while water cooled chillers use water.

• Air cooled chillers have a condenser coil and a fan to remove heat from the refrigerant

• Water cooled chillers have a condenser and a cooling tower to remove heat from the refrigerant

• Air cooled chillers are easier to install and maintain

• Water cooled chillers are more efficient and can handle larger cooling loads

• Air cooled chillers are typica...read more

Primary, secondary, condenser pump and AHU are components of HVAC system that work together to regulate temperature and air flow.

• Primary pump circulates chilled water from chiller to AHU

• Secondary pump circulates hot water from boiler to AHU

• Condenser pump circulates water from chiller to cooling tower

• AHU (Air Handling Unit) conditions and circulates air throughout the building

The chemical name for water cooled chiller is Ethylene Glycol.

• Ethylene Glycol is a colorless, odorless, sweet-tasting, viscous liquid.

• It is used as a coolant in water-cooled chiller systems.

• It prevents freezing and corrosion in the system.

• It is also used in antifreeze and de-icing solutions for aircrafts.

• It is toxic if ingested and can cause serious health problems.

• Proper handling and disposal is necessary to prevent h

There are mainly two types of gases used in chillers: R-22 and R-134a.

• The most commonly used gas in chillers is R-22.

• R-134a is a more environmentally friendly alternative to R-22.

• Other gases like R-407c and R-410a are also used in some chillers.

• The type of gas used in a chiller depends on its design and application.