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Rv > Refrigerators > Flashcards

Refrigerators Flashcards

1
Q

What are the three purposes of the P-trap on the sealed combustion fridges?

A

Prevent down draft
Prevent moisture from outside
Prevent condensation from dripping on the flame

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2
Q

What is a sealed combustion fridge?

A

A fridge that draws combustion air from outside and exhausts outside the unit

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3
Q

What is the priority sequence for a norcold fridge?

A

1st- AC
2nd- propane
3rd- 12vdc

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4
Q

What is the priority sequence for a domestic fridge

A

1- AC
2- 12VDC
3-propane

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5
Q

What should you do with a fridge door that is cracked or warped?

A

Replace

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6
Q

What is the advantage of wire shelving in the fridge?

A

Allows for good air flow and circulation

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7
Q

How do you adjust a fridge door?

A

Loosen the hinge bracket screw and adjust.

All or remove washers if need to raise or lower the door

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8
Q

How might the light be wired into the fridge?

A

May be wired into the harness for the thermistor

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9
Q

What turns the fridge light on in low ambient temp.

And what temp should it turn off?

A

Low ambient temp switch

Should turn off when it’s 50F (10C) outside

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10
Q

What can happen if the door switch is defective?

A

It can cause inefficient cooling if the bulb remains on

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11
Q

What should be turned on if condensation is noticed

A

The High humidity switch and heater

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12
Q

What does the High humidity and heater do?

A

Keeps the surface between the door opening dry during high humidity conditions

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13
Q

What are two purposes of the eyebrow control

A

Used to select the mode of operation

Displays the mode of operation

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14
Q

What senses refrigerator interior temp.

A

Thermistor

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15
Q

What will temp do to the thermistor?

A

It affects the resistance of the thermistor
Temp increases - resistance decreases
Temp decrease- resistance increases

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16
Q

What 3 components will distribute DC Current?

A

Connecting lead,
Ribbon cables
Wire harnesses

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17
Q

What controls the circuit to the 12vdc heat element?

A

The 12vdc relay

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18
Q

What completes the circuit through the flame to ground?

A

The sensor probe

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19
Q

What does the ignition module do?

A

Ignited and monitors the flame
Powers the gas valve
If flame is out it will spark for a period, the close the gas valve and go into “check” mode

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20
Q

What does the reignitor/relighted do?

A
  • Monitors the flow of micro-amps through the flame.

- If it doesn’t sense micro-amps it will spark indefinitely until flame is established

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21
Q

How far must the igniter probe or electrode be above the burner

A

Domestic: 3/16 above burner
Norcold: 1/8”-3/16 above burner slots

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22
Q

What is a zip tube?

A

A perforated aluminum tube with holes that allows the flame to travel down

23
Q

What should you do if the piezo snaps but there is no spark?

A

There is a problem with the high tension wire or the electrode

24
Q

What does the thermocouple do and what does it generate

A

It energizes the electromagnetic in the safety valve

Generates 14-30 Millivolts

25
Q

When should you replace the thermocouple?

A

If the tip is burnt.

26
Q

What are the two types of electric heating elements?

A

Pencil type

Cartridge type

27
Q

How big is the cartridge type heating element?

A

5/8” or larger

28
Q

Which T-stat has one capillary tube and bellow that controls both functions?

A

The combination propane/electric thermostat (manual model)

29
Q

What is the purpose of the flue baffle?

A

It’s to concentrated heat from the burner at the boiler/generator

Forces heat to the outside of the flue tube

30
Q

What is directly under the flue tube?

And what is it’s purpose?

A

The burner

To apply heat to the boiler/generator

31
Q

What are the 4 types of orifices?

A
  • Ceramic insert
  • drilled brass fitting
  • stainless steal insert/ brass fitting
  • laser drilled ruby insert/brass fitting
32
Q

How do you clean all the orifices?

A

Methal hydrate and tooth pick except the ruby just clean and dry

33
Q

What is threads on most test ports?

A

1/8” NTP female threads

34
Q

What are the two types of thermostat inlet and outlet fittings?
What must be done every time the thermostat is separated?

A

Threaded type
O-ring deal type

The o-ring must be replaced

35
Q

What controls the “low flame”?

And what does it consist of?

A

The bypass screw.

Bypass screw, gasket, o-ring

36
Q

What is in the capillary tube?
And what does it do?
Where is the sensing side attached too?

A

Contains refrigerant that expands and contracts

It moves the bellows and controls the propane

It’s attached to the high-temp evaporator fins

37
Q

On a propane T-stat, what happens when it’s satisfied with the temp.?

A

The pressure is reduced to 3-5”WC to produce “low flame”

38
Q

What the AC working range of a fridge?

A

108-132volt

39
Q

What are the 3 functions of the lower vent

A

Fresh air intake
Fresh air for ventilation
Access for service

40
Q

Where must the lower fridge vent be?

A

Bottom edge must be at or below the fridge cabinet floor to allow for propane vapour to flow out

41
Q

What is the “thermo-siphon effect”

A

Hot air rises and cooler air is drawn in the bottom

42
Q

What is the side clearance for the fridge?

A

MAX 1/2” on either side

43
Q

What is the max clearance for the top of the fridge?

A

MAX 1/4”

44
Q

What may may happen to the fridge in low ambient temp

A

Ammonia/water mixture may gel in the absorber and stop circulating causing the fridge to stop cooling

45
Q

What do you do when performing a Bypass test?

What should it cool to?

A

You bypass the thermostatic controls and let run for 24 hrs on 120vac
Water should cool too -10C

46
Q

What do you do when performing a “run test”

What temp should it cool too

A

Just let run for 12-24 hours.

Water should cool down too minimum of 6C (43F). (34-38 is better)

47
Q

What does excess moisture or frost build up in the fridge/freezer indicate?

A

Air leaks

48
Q

What is the hydrogen static gas pressure? And when heated?

A

250 psi and up to 600psi when heated

49
Q

What are the four main components of the cooling unit

A
  • boiler/generator
  • condenser
  • evaporator
  • absorber vessel/leveling chamber
50
Q

How far off level can the fridge be?

A

3 degrees side to side

6 degrees front to back

51
Q

What can happen if the fridge is run off level?

A

The sodium chromate can overheat and crystallize and cause a blockage

52
Q

What are the 4 chemicals in the cooling units

A

Ammonia
Water
Hydrogen
Sodium chromate

53
Q

What kinda motor is in the compressor refrigerators?

A

A “Swing motor”

54
Q

What kind of power do most compressor fridges need at the compressor?
How is this accomplished?

A

20VAC!

With step down transformers and inventors

Rv (23 decks)

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