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Rv > Water Heaters > Flashcards

Water Heaters Flashcards

1
Q

What are two types of water heaters and 2 energy sources

A

Pilot and DSI.

Propane and 120AC

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2
Q

What are the most common sizes of water heaters

A

6 and 10 gallon

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3
Q

Why would a pilot model water heater need 12V?

A

To supply the optional reignitor

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4
Q

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

A

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

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5
Q

What are the two types of water tanks?

And which one needs an anode rod?

A

Zinc clad aluminum
Glass lined steel

Glass lined tanks need anode rods

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6
Q

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

A

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

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7
Q

How many watts are the heating elements

A

1000-1500 watts

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8
Q

What is in the 120v heating element circuit?

A

Switch
T-stat
ECO
Heating element

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9
Q

What is the ECO set at?

A

180F

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10
Q

What is the T-stat set at?

And what temp does it usually kick back on at?

A

140f

100f

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11
Q

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

A

Will need to replace the whole gas valve

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12
Q

What is an XT water heater?

A

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

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13
Q

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

A

150psi and 210F

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14
Q

What is the purpose of the T&P valve?

A

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

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15
Q

What size connection is at the water connections?

A

1/2 female pipe thread

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16
Q

What determines the water heat with the engine assist?

A

The engine coolant temp

Can overheat the ECO

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17
Q

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

A

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

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18
Q

When should the anode rod be replaced?

A

When there’s 75% gone

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19
Q

What does the thermocouple produce
When unloaded?
When loaded?

A

25-35 millivolts unloaded

12-14 millivolts loaded

20
Q

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

A

1.5 micro Amps

21
Q

Explain the dielectric strength test

A

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

22
Q

What should the gas valve read when testing it?

A

45 ohms

23
Q

What is the switch normally on a water heater?

A

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

24
Q

Where is the thermostat normally located?

A

Usually mounting on the front or back of the tank

25
Q

What does ECO Stand for?

A

Energy cutoff switch

26
Q

What colour wire goes to the LED bulb?

A

Blue

27
Q

What is the advantage of a potted board?

A

It’s resistant to corrosion and damage

28
Q

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

A

6-8 second

29
Q

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

A

A 1.5microfarad capacitor in parallel

30
Q

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

A

12 volts and a switch

31
Q

What is the advantage of a instant hot water tank?

A

More efficient because water is not stored?

32
Q

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

A

1.4 gallons per minute

33
Q

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

A

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

34
Q

What size can do the instant water heaters go up too

A

50,000 btu’s/hr

35
Q

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

A

1/2”

36
Q

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

A

About 2 litres

37
Q

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

A

A solution with 0.5% chlorine

38
Q

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

A

A depletion of the air pocket

39
Q

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

A

A neoprene sleeve

40
Q

Where are the regulators mounted on the cooktops?

A

They are mounted to the manifold inlet

41
Q

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

A

1/8”

42
Q

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

A

Zip tubes or flash tubes

43
Q

What determines the maximum volume of gas to the burner?

A

The orfice

44
Q

How should you clean the cooktop burners?

A

Soak in warm water and clean with a toothpick

45
Q

What is a RV range?

A

A cooktop and an oven

46
Q

P&T valve thread sizes are?

A

1/2” or 3/4” national pipe thread

Rv (23 decks)

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