HVR 170 Finals

What is the recommended maximum number of grains per pound of material in the water supplied to an atomizing humidifier

10

Hot water boiler limit controls are usually set at _____ °f

200

HEPA filters can filter to a very high efficiency-down to a(n) _____ micrometers sized particle or lower.

3

What are the relative humidity limits recommended for residences?

40% to 60%

Why should humidifiers be cleaned on a regular basis?

Bacteria and mold can grow

When odor is a concern, a filter containing _____ should be used.

Charcoal

The main purpose of adding a _____ to a heating system is to replace the moisture that is removed by the heating equipment

Humidifier

What is the purpose of system pressure differential bypass valve?

It relieves pressure and reduces noise

The device that will shut down a boiler if the water temperature gets too high is called an

Limit control

What is an atomizing humidifier?

One that puts tiny droplets of water (mist) into the air

How does adding humidity to the air in a residential affect the thermostat setting?

Raising the relative humidity of the air allows comfort levels at a lower thermostat settings

A series loop hydronic system is not desirable for use in a large residence because

all the heated water will flow to all rooms

The reason for using zone valves on a hydronic heating system is to _____

allow different areas of the structure to maintain different temperatures

A house is built on property whose soil is rich in uranium. The occupants of the house may

be exposed to radon gas

The material used to make circular impellers is

bronze

The two types of atomizing humidifiers are the spray nozzle and

centrifugal

Hydronic heat circulators are

centrifugal pumps

It ____ possible for hydronic system with many zones to operate with one circulating pump.

certainly is

One of the most common substances that is used as an absorber is

charcoal

Electronic air cleaners generally have

charcoal filters

On systems that use two-port zone valves, excessive pressure in the supply header may result when multiple zone valves

close

Boilers that have efficiencies over 90% are commonly referred as

condensing boilers

_____ filters have large surface areas and require a deep filter case

cube

The more common type of expansion tank is the _____ expansion tank

diaphragm-type

Air in homes tends to be _____ in the winter

drier

In ionizing section of an electronic air cleaner, the particles in the air are given a(n)

electric charge

For high-efficiency fossil fuel and electronic furnaces as well as heat pump system the recommended humidifier would be a(n) _______ type.

electrically heated

Humidification generally relates to the process of causing water to ____ into the air

evaporate

What is the major objection to an atomizing type humidifier?

fine dust from the minerals from the water are atomized into the air

The most popular way of heating using a hot water system is by the use of _____ on the outer walls of the area

finned-tube baseboard

An automatic air vent controls the airflow out of the system by means of a(n) ______. Which rises and falls with the amount of air in the system

float

If reservoir-type humidifiers are not properly maintained, which of the following can be discharged into the air?

fungi

The more sections a boiler has, the _____ it's capacity will be

higher

Hydronic heating can refer to both ______ and steam

hot water

With the _____ in the supply duct, the air is heated and then humidified

humidifier

An extended surface filter (pleated type)

is able to remove more dirt since the surface area is larger

The device that will shut down a boiler if the water temperature gets too high is called a(n)

limit control

The steps to aggressively controlling the contamination of indoor air would involve

locating and eliminating the source of contamination

A fiberglass filter media air filter contains a dust-holding adhesive that helps prevents particulates from

migrating downstream

The controller for a humidifier, a humidistat, has a power element that is ____ sensative

moisture

A limit control on a hot water boiler is needed to ____

protect the boiler against excessive water temperatures

In a _____ the water going through the last terminal unit will be the same temperature as the water through the first terminal unit.

series loop

A _____ domestic water system provides hot water from a coil in the boiler

tankless

What is relative humidity?

the percent of moisture in air as compared to the amount it could hold if it were saturated

The zone control valves are controlled by

thermostats

Atomizing humidifiers discharge _____ into the air.

tiny water droplets

Why are balancing valves used in hydronic systems?

to adjust the amount of hot water to the zone to handle the heat loss of the zone

Why must the expansion tank always be located higher than the boiler?

to permit air in the connecting line to rise to the tank without being trapped in the line

What is the purpose of the pressure relief valve?

to relieve at at or below the maximum allowable working pressure of the low pressure boiler

Thermostats automatically control the operation of _____

zone control valves