Water Heaters

Question 1

What are two types of water heaters and 2 energy sources

Answer 1

Pilot and DSI.

Propane and 120AC

Question 2

What are the most common sizes of water heaters

Answer 2

6 and 10 gallon

Question 3

Why would a pilot model water heater need 12V?

Answer 3

To supply the optional reignitor

Question 4

Where does the primary and secondary air enter for the flame?

Answer 4

Primary from the air shutters and secondary at the end of the burner tube

Question 5

What are the two types of water tanks?

And which one needs an anode rod?

Answer 5

Zinc clad aluminum
Glass lined steel

Glass lined tanks need anode rods

Question 6

What kind of glue tube does the glass lined steel tank have?

Answer 6

The flue tube is a large closed-end pipe with a horizontal divider plate. Goes to the back, then up, then out

Question 7

How many watts are the heating elements

Answer 7

1000-1500 watts

Question 8

What is in the 120v heating element circuit?

Answer 8

Switch
T-stat
ECO
Heating element

Question 9

What is the ECO set at?

Answer 9

180F

Question 10

What is the T-stat set at?

And what temp does it usually kick back on at?

Answer 10

140f

100f

Question 11

What happens when the ECO trips on a pilot model water heater?

Answer 11

Will need to replace the whole gas valve

Question 12

What is an XT water heater?

Answer 12

It’s a 10g water heater that heats the water to 170F and has a mixing valve on the back. Advertised as a 16 gallon tank

Question 13

What temp and pressure is the T&P valve set at?

Answer 13

150psi and 210F

Question 14

What is the purpose of the T&P valve?

Answer 14

To protect the water heater from rupturing if both the T-stat and the ECO fail

Question 15

What size connection is at the water connections?

Answer 15

1/2 female pipe thread

Question 16

What determines the water heat with the engine assist?

Answer 16

The engine coolant temp

Can overheat the ECO

Question 17

What happens inside the tank when the water is being heated?

Answer 17

Electrolysis. Which will eat away at the tank lining and anode rod

Question 18

When should the anode rod be replaced?

Answer 18

When there’s 75% gone

Question 19

What does the thermocouple produce
When unloaded?
When loaded?

Answer 19

25-35 millivolts unloaded

12-14 millivolts loaded

Question 20

On a DSI water heater, how much power does the board sent through the flame sense?

Answer 20

1.5 micro Amps

Question 21

Explain the dielectric strength test

Answer 21

A test that the circuit is capable of withstanding 900v for 1 min
Or 1080 v for 1 sec

Is you use DC power us 1.414 times the value

Question 22

What should the gas valve read when testing it?

Answer 22

45 ohms

Question 23

What is the switch normally on a water heater?

Answer 23

Usually a rocker switch with and indicator light. Has 4 spade connectors on the back

Question 24

Where is the thermostat normally located?

Answer 24

Usually mounting on the front or back of the tank

Question 25

What does ECO Stand for?

Answer 25

Energy cutoff switch

Question 26

What colour wire goes to the LED bulb?

Answer 26

Blue

Question 27

What is the advantage of a potted board?

Answer 27

It’s resistant to corrosion and damage

Question 28

What power is sent to the board how long does it wait before sparking?

Answer 28

6-8 second

Question 29

When testing the flame sense, what should you use to protect your meter?

Answer 29

A 1.5microfarad capacitor in parallel

Question 30

What is the difference between a pilot and DSI water heater?

Answer 30

12 volts and a switch

Question 31

What is the advantage of a instant hot water tank?

Answer 31

More efficient because water is not stored?

Question 32

How much water much be flowing to open the impeller switch?

Answer 32

1.4 gallons per minute

Question 33

What line is used on the instant water heaters and how is the temperature monitored?

Answer 33

Copper coils is used for good heat transfer. And has thermal switches at the bottom middle and top

Question 34

What size can do the instant water heaters go up too

Answer 34

50,000 btu’s/hr

Question 35

What size inlet water supply is needed for the instant water heater

Answer 35

1/2”

Question 36

How much water is left in the water heater after it’s drained?

Answer 36

About 2 litres

Question 37

What can be used to clean and sanitize and remove odour from the tank?

Answer 37

A solution with 0.5% chlorine

Question 38

What is the main cause of the p&t valve leaking?

Answer 38

A depletion of the air pocket

Question 39

Oh a cooktop what should be installed in the burner tubes to keep them from rattling?

Answer 39

A neoprene sleeve

Question 40

Where are the regulators mounted on the cooktops?

Answer 40

They are mounted to the manifold inlet

Question 41

On the cooktops, what is the pilot flame adjustment size?

Answer 41

1/8”

Question 42

On the cooktops what are the tubes called that’s allow the one pilot to light multiple burners?

Answer 42

Zip tubes or flash tubes

Question 43

What determines the maximum volume of gas to the burner?

Answer 43

The orfice

Question 44

How should you clean the cooktop burners?

Answer 44

Soak in warm water and clean with a toothpick

Question 45

What is a RV range?

Answer 45

A cooktop and an oven

Question 46

P&T valve thread sizes are?

Answer 46

1/2” or 3/4” national pipe thread