The time-delay module allows for a ______minute delay from the time the condensing unit shuts down to when it starts again to prevent possible damage from short cycling.

A branch take off fitting shall not be installed closer than 18 inches from a trunk end plate.(Manual D sec. 5)

All pumps have a limit to the amount that they can pump. This amount of lift a pump can achieve is referred to a head pressure. Pumps need to be sized for the amount of verticle and horizontal lift required for the system.

Outdoor air supplied to replace exfiltration and exhaust air and air used to support the combustion process is known as

A 42000 Btu air conditioning system is a

Unit and wall heaters are typically mounted on the ceiling or wall and use a fan to distribute the heat by forced convection. They are controlled by a low volt thermostat.

POE oils are poly-ester or poly ester based and have been very popular in the refrigerant industry. However, they hold moisture and require longer evacuation times.

An area where biological growth develops and grows due to moisture, nutrition, and lack of light is know as

According to Manual J, the latent heat loads associated with people, plants and appliances is _________ for each person normally expected to occupy the residence.

Convert a velocity pressure reading of 0.09 inches of water column to velocity in feet per minute using the following formula: Velocity in FPM = 4005 x the square root of the velocity pressure. (Basic Fundamentals of Airflow, page 26)