Hvac Test 1 Dstelps

Front 1

Smallest baseboard heater availble according to the module

Back 1

500 W

Front 2

What is the anticipator used for in a thermostat?

Back 2

Limits overshoot

Front 3

What is a heat exchanger used for, and what does it do?

Back 3

Activates the blower once it reaches its set temperature

Front 4

What does a plenum heater, duct heater do and where is it installed?

Back 4

They are intended to be the primary source of heat, they are installed directly in the upflow vertical duct, and plenum

Front 5

What regulates flow of air in an HVAC system?

Back 5

A damper

Front 6

Device that controls outside air mixture vs. Min air mixture requirements

Back 6

Minimum position device

Front 7

Types of control valves in HVAC system

Back 7

Two way and three way

Front 8

What does an economizer do?

Back 8

Returns dampers to minimum position when outdoor air is above the air return temp.

Front 9

What does a freeze stat do?

Back 9

Protects the water coils from freezing

Front 10

What advantage does an enegy management system program have?

Back 10

Cost efficient and economical

Front 11

What is the usual watt per unit length rating of standard density baseboard heaters?

Back 11

250 W increments

Front 12

Residential FURNACES are usually available in both single phase and 3-phase ratings from___kW-__kW

Back 12

5 kW-40kW

Front 13

What type of electric heater unit can be used with certain oil fired, forced air furnaces?

Back 13

Plenum heaters

Front 14

Are you aloud to shorten series heating coils? And if not why?

Back 14

No, shortening the coil will drop the resistance causing an increase in current and potential fire hazard

Front 15

What does the anticipator resistor do in the room thermostat?

Back 15

Limits the set point overshoot to an acceptable value

Front 16

List 2 conditions that may cause overheating of the heat exchanger

Back 16

·Blower does not run

·insufficient air flow

· room thermostat contacts stuck closed

Front 17

Where should an electronic air cleaner be installed on a furnace?

Back 17

In the return airduct

Front 18

Why should electronic air cleaners be interlocked with the blower motor?

Back 18

To prevent ozone from accumulating

Front 19

Mixed air is a mixture of____ and ____

Back 19

Return air and outside air

Front 20

What are the fail safe positions for the outside, exhaust and return air dampers?

Back 20

"NO"=return air

"NC"=outside air

Front 21

Is the freeze stat usually a manual or an automatic reset device?

Back 21

Manual

Front 22

What is the general power limitation for a class 2 circuit?

Back 22

100 VA