By raising the forearm in the air, index finger pointing upward and holding the hands straight, the operator will know to raise the cable on the crane.

Curbs can be prefabricated, but many larger curbs are shipped unassembled.

Gasketing materials and foam panels that are shipped with the curb are not part of the curb and should be discarded.

By utilizing a strategy called demand control ventilation, DCV, the amount of outside air being brought into the building can be varied based on the actual occupancy level in the structure.

Improper clearances do not affect the ability of service personnel to perform their jobs adequately.

The curb’s cross braces are intended to support the duct connections to the unit, but not the entire air distribution system.

Although packaged air-conditioning equipment comes precharged with refrigerant and no field piping must be done, the installation of a rooftop package unit involves many steps and can be very dangerous.

Package units are factory-assembled, factory-charged, self-contained systems that have all of the major system components contained in a single housing.

The rooftop unit houses the fans and blowers that move air through the heating and cooling portions of the unit but not through the condenser.

Some roofs are bonded, which are roofs that carry a written warranty or insurance policy that protects the building owner in the event damage from leaks occurs.

The term enthalpy refers to the total heat content in the air, which accounts for both the temperature (sensible heat portion) and the moisture content (latent heat portion) of the air.

Be sure to provide proper and adequate support for the duct system according to ____.

An enthalpy sensor includes solid state temperature and ____ sensors.

The unit’s location should be carefully selected so the system’s operation is not adversely affected by air being able to ____ the condenser coil.

With both fists in front of the body, pointing the thumbs outward tell the crane operator to ____ the boom.

It is good field practice to double-check and possibly triple-check the ____ decision, since the cost of repairing an improperly cut roof can be very high.

By tapping his fist on his ____, the crew member is telling the crane operator to use the main hoist.

It should be noted that, in most cases, the supply and return ductwork must be attached to the ____ before the unit is set in place.

____ are intended to help provide the correct amount of ventilation and also help reduce cooling costs by allowing outside air to be introduced to the conditioned space when conditions are correct.

Rooftop units are often positioned ____ the space that is to be served by the equipment.

The fans that move air through the air-cooled condensers are of the ____-type.

The amount of refrigerant indicated on the ____ is the total refrigerant charge for the unit, not simply a holding charge as in the case of a split-type system.

The economizer is able to increase or decrease the amount of outside air that is brought into the structure with two ____.

If the curb is mounted as part of a new construction process, it can be assembled and installed as soon as the ____ support system is in place.