Heat Emission Units

Question 1

What is the maximum temperature for a low temperature hot water boiler?

Answer 1

121 C
250F

Question 2

What is the maximum pressure for a low temperature hot water boiler?

Answer 2

1100 kpa
160 psig

Question 3

If a low temperature hot water boiler is made of cast iron what is its maximum pressure?

Answer 3

207 kPa
30 psig

Question 4

What type of low temperature hot water boiler has a lower maximum pressure rating?

Answer 4

Cast iron

Question 5

What temperatures can high temperature hot water boilers operat at (low end)?

Answer 5

121c
250 f

Question 6

What is the low end pressure tolerance for a high temperature hot water boiler ?

Answer 6

1100 kpa
160 psig

Question 7

Name 3 methods of heat transfer

Answer 7

Conduction
Convection
Radiation

Question 8

In a base board heater how is most heat transmitted to the room?

Answer 8

Convection

Question 9

What size copper tubes are used to n a finned tube base board heater?

Answer 9

3/4 to 1 1/4

Question 10

What size steel tubes are used ina finned base board heater?

Answer 10

1 “ to 2” iron pipe size

Question 11

When can finned elements be installed without a protective covering?

Answer 11

Where there is no hazard to personnel , the elements may be installed without a protective cabinet or with minimal protective covering.

Question 12

How do free standing cast iron radiators heat

Answer 12

Using convection currents and with radiation due to their high mass.

Question 13

In a finned tube base board how many fins do they have per ft

Answer 13

55-65 per ft

Question 14

How are the convection currents controlled on base board heaters?

Answer 14

Dampers

Question 15

What will aluminum or bronze paint do to heat emotes by radiation ?

Answer 15

Reduce heat emitted by 10% or more.

Question 16

What are the 2 parts of a convector?

Answer 16

Heating element and cabinet

Question 17

Name 3 styles of convector

Answer 17

Surface mount unit

Fully recessed model

Semi-recessed model

Question 18

Name 2 types of unit heaters

Answer 18

Blow through

Draw through

Question 19

How many rows of fins can fin vectors have?

Answer 19

3

Question 20

In a typical hydronic heating system when piping is fed from below up to the heat emission unit what must be installed to help with air entrapment?

Answer 20

Air vent

Question 21

When installing baseboard heater who should be consulted to determine flow rates and supply temperatures?

Answer 21

Manufacturers table.

Question 22

At what height should unit heaters be located?

Answer 22

6-12 feet above the floor

Question 23

Where should unit heaters be faced?

Answer 23

Towards outside or exposed walls

Question 24

In larger areas where should unit heaters be located?

Answer 24

Along exposes walls

Question 25

How far from any vertical or horizontal surface must a unit heater be installed?

Answer 25

At least 6”

Question 26

A few not heater must discharge towards a source of cold air from how far away?

Answer 26

15-20 feet

Question 27

Air handling units are typically mounted to concrete pads and be bolted down to prevent movement True or false?

Answer 27

False Shock absorbing springs should be installed to avoid transfer of vibrations

Question 28

When performing maintenance on coils what should be done.

Answer 28

Clean debris and straighten fins with comb .

Question 29

In which direction does heat always travel?

Answer 29

From warmer objects to colder objects.

Question 30

What is the best location for installing base board fin?

Answer 30

On exterior walls with or without windows.