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Rv > Heating Appliances > Flashcards

Heating Appliances Flashcards

1
Q

How many amps can a thermostat handle?

A

Less then 1 amp

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2
Q

What’s the purpose of the furnace board?

A

To pudge
Open gas valve
Send a spark
Sense a flame is present.

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3
Q

What does a thermostat measure

A

The intensity of the heat

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4
Q

What is BTUS

A

British thermal units

- the heat energy required to raise or lower 1 pound of water 1 degree F

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5
Q

What does the heat anticipator do?

A

It controls how fast the furnace kicks back on

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6
Q

Where should the thermostat be located?

A

The thermostat should be located in the common he place. Should be on an interior wall for the 4 1/2 feet above the floor

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7
Q

How far should A gas burning appliance be from any gas filler spout?

A

Must be at least 36” away

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8
Q

Where in must the gas burning appliance exhaust be?

A

Must exhaust out the side wall of the unit and where a door cannot come within 2 inches

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9
Q

How far must a flew terminal (exhaust) be from any opening

A

At least 9

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10
Q

What is the difference between a normal relay in a time delay relay

A

Normal really uses magnetic field to move the Bi metal strip

A time delay relay uses heat to move the bi metal strip

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11
Q

What is the purpose of the circulating air blower wheel

A

Circulates cool interior air past the exterior of the heat exchanger

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12
Q

What is the purpose of the combustion air wheel

A

Draws outside air into the combustion chamber for proper fuel to air mixture

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13
Q

What is the sales which do

A

Senses when the airflow is at least 75 to 80%

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14
Q

What is the limit switch

A

It’s a high temperature safety device on the furnace which will open when it exceeds the highest safest temperature

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15
Q

How does the gas valve operate

How many ohms per valve

A

Once the magnet is powered by at least 10 1/2 V it opens allowing gas through
30-50 ohms per valve

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16
Q

How does the thermal coupler work

A

When heated up it produces electricity which holds the gas valve open

17
Q

How does the flame sense work

A

It sends power through the hydrocarbons in the flame ground into the burner

18
Q

What is a general rule for size in a furnace

A

1,000 btu’s per 1 foot of the RV length. 1,500 btu’s per foot for slide outs

19
Q

How far must exhaust pipe overlap

How far most of the intake pipe overlap

A

Exhaust must overlap inch and a quarter in the intake must overlap half an inch

20
Q

The DSI circuit board sents how many volts to the electrode?

A

80,000v

21
Q

What is the charge rate of a liner converter

A

3-5 amps

22
Q

What converts the AC voltage into DC voltage in a converter? How does it rectify the voltage from AC TO DC

A

A step-down transformer is used to convert 120 voltage to 12 volts

Doides are used to rectify the voltage from AC to DC

23
Q

How much voltage does a thermocouple produce under load

A

20-30 mVDC

24
Q

What is a thermocouple and how does it work?

A

It is a safety valve on a pilot model thermostat. Basically a flame sense.
When heated up it produces an electricity which holds the gas valve open

25
Q

What should be the gap between the electrode and ground?

A

Between 1/8- 3/16th

26
Q

What should be the amp readings On a working flames sense?

A

Between 5-10 micro amps (mA)

27
Q

Once the board receives power through the safety Circuit how long will it purge for?

A

About 20 seconds

28
Q

What does a 2 stage furnace need?

A

Needs two gas valves and a special thermostat

29
Q

What size are the hydronic systems typically?

A

50,000 btu or 1500W

30
Q

What exactly does the thermostat in the hydronic system control?

A

It’s controls the solenoid/valve that allows the amount of warm fluid enters the heat exchanger

31
Q

How much can you adjust the bay thermostat on the hydronic systems?

A

Only between 40-50•F

32
Q

How is the hydronic system Plumbed?

A

The zones are plumbed in parallel and the zones themselves are plumbed in series

33
Q

How hot does the hydronic system keep the fluid?

A

Between 160-190•F

34
Q

What senses the flame on diesel hydronic systems?

A

A photo sense

35
Q

How often should the hydronic system be checked?

A

Once a month along with the power steps

36
Q

What is boiler antifreeze?

A

It is propylene glycol

37
Q

What do you use to check the antifreeze mixture?

A

A refractometer

Rv (23 decks)

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