Typically, the discharge-air set point should never be lower than 55oF or higher than 70oF. The set point can be a little lower than 55oF in climates with high relative humidity, however, where dehumidification is required.

What does a discharge air temperature sensor do?

The Discharge Air Temperature sensor is used to measure the temperature of the air that is emitted from the air ducts.

What is discharge air control?





The discharge air controller attempts to maintain the discharge air temperature within the adjustable control band by first modulating the outdoor air economizer. The economizer is permitted to modulate only when a separate enthalpy sensor indicates that suitable outdoor air conditions exist.

Is discharge air the same as supply air?

Supply Air Temperature is the temperature of the air just after the evaporator/heat exchanger. Discharge Air Temperature is the temperature of the air exiting the registers (vents).

Why is the supply air temperature 55 F?

The current standard supply air temperature is considered to be 55°F [12.8°C] and evolved to this temperature to allow space relative humidity in the range of 50% to 60%, while maximizing chilled water systems and chiller efficiencies.

What is the air temperature?

Air temperature is a measure of how hot or cold the air is. It is the most commonly measured weather parameter. More specifically, temperature describes the kinetic energy, or energy of motion, of the gases that make up air.

What is space temperature in HVAC?





Thermostats in individually controlled spaces should be set in the range 68°- 72° F during the winter and 72°- 76° F during the summer (as recommended by American Society of Heating, Refrigeration and Air Conditioning Engineers ASHRAE).

What are the signs of an overcharged unit?

4 Signs Of An Overcharged Air Conditioning System

  • Higher Cost of Operation. An overcharged air conditioner system costs more money to operate, by decreasing overall efficiency. …
  • Sticky Indoor Air. …
  • Excessive Condenser Heat. …
  • Non-Functioning Air Conditioner.

How do I know if my HVAC is overcharged?

The most common indicators of an overcharged system are:

  1. Increased pressure throughout the system, characterized by high head pressure and high suction pressure with low suction superheat;
  2. Increased flooding of refrigerant to the compressor during off-cycle, which may cause flooded starts;

What happens if you overcharge 410A?



Overcharged refrigerant

If there is an excess of refrigerant, it can flood the compressor and damage the mechanical components. Also, this problem will have an impact on your electric bills because the refrigerant pressure will increase on suction and discharge, and the compressor will demand more amperes to work.