JJ Ｈａｎｄ Ｃｏｏｌｉｎｇ Flashcards
If a system designed for use with natural gas is supplied with propane gas
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The gas regulator and valve must be replaced
The flame will be too low unless a larger orifice is installed
No changes are needed for the equipment to function properly
The flame will be too high unless a smaller orifice is installed
supplied备有…的
orifice孔，穴，腔
The flame will be too high unless a smaller orifice is installed
Which of the problems listed below could occur发生 if gas fired equipment has incorrect venting or not enough combustion燃烧 air:
Untempered air from outside will flow into the house
Tripping绊倒 of a circuit breaker
Gas leak
Carbon monoxide一氧化碳 buildup
Carbon monoxide buildup
A device that automatically closes the gas valve if the pilot light goes out is called:
Thermocouple
Drip leg
Globe valve
Temperature pressure relief valve
Thermocouple
The house you are inspecting currently has a gas fired furnace or boiler. Each of the following clues may indicate表明 that the house also has an abandoned被遗弃的 buried fuel oil storage tank except
The brick chimney servicing\ the furnace or boiler has deteriorated变质的 mortar joints
Your knowledge that the neighborhood had or still has some houses served by oil heat
Small diameter copper tubes emerging from the inside of the foundation wall or the floor near the furnace or boiler
An approximately大约 1 ¼ inch diameter vent pipe outside coming from underground up against反对 the foundation
Small diameter copper tubes emerging from the inside of the foundation wall or the floor near the furnace or boiler
An inspector notes that the heat pump is not functioning and that the condensate pan under the air handler is full of water. Why might these two things be related?
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The full condensate pan tripped绊倒 a condensate overflow switch. The unit turned off in order to ensure确保 that condensate did not spill溢出
The full condensate pan indicates that the air handler fan is not functioning as it should
The full condensate pan indicates that there is a leak in the heat exchanger, which as depressurized减压 the unit, causing it to turn off
The full condensate pan means that combustion燃烧 byproducts condensed 浓缩and are flowing back into the house via the flue. This tripped the flue gas spill switch, turning the unit off
The full condensate pan tripped绊倒 a condensate overflow switch. The unit turned off in order to ensure确保 that condensate did not spill溢出
The 3 main controls on a furnace are:
The thermostat, the primary control, and the photocell.
The thermostat, the limit control, and the fan control.
The thermostat, the gas valve, and the thermocouple.
The thermostat, the limit control, and the pump control
The thermostat, the limit control, and the fan control.
Which action is required during the Heating Inspection according to the S.O.P.?
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- Required to observe the interior of flues and fireplace insert flue connections
- Required to operate automatic safety controls
- Required to inspect the uniformity or adequacy of the heat supply to rooms
- Required to inspect the heat distribution分布 system
Required to inspect the heat distribution分布 system
A large rectangular duct protruding from the heating system is called a _________.
- Plenum
- Register
- Loop
- Perimeter
Plenum
What color should flames be in a properly operating oil burner?
- Any color as long as they have sooty or smoky edges
- White or red
- Bright orange or yellowish white
- Blue
Bright orange or yellowish white
Air is the heat-conveying medium for Hydronic Heating Systems.
- True
- False
False
Which of the following need not be observed in the heating system inspection?
Underground oil storage tanks
Ventilation in a furnace room
An abnormal amount of soot in and around the furnace
Gas burners inside the heat exchanger
Underground oil storage tanks
If the ducts of the HVAC System run through unconditioned spaces in the house, such as a crawlspace or an attic, then the ductwork should be _______.
Metal
Dampered
Shortened
Insulated
Insulated
In a forced air furnace, the burners are used to generate heat in the
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Flue
Plenums
Draft diverter
Heat exchanger
Heat exchanger
Where is the reset button on an oil furnace?
Adjacent to the inspector
Below the filter
Next to the fuel pump
On the primary control attached to the burner
On the primary control attached to the burner
The heat source for an Air-to-Air Heat Pump is:
Outside Air
Thermal Panels
Electric Resistors
The Ground Temperature
Outside Air
You see during your inspection that the air conditioning system has supply registers in each bedroom, but only one large return register is located in the center hallway. Your first course of action would be:
Report that the life of the A/C equipment will be reduced
Recommend to your client that return ducts be installed in each bedroom
Check to see if the bedroom doors are undercut at the bottom
Report that the A/C system will not work well
Check to see if the bedroom doors are undercut at the bottom
If part of the air-conditioning unit is in the attic and there is moisture on the ceiling below, what air-conditioner component might be causing the moisture?
Fan
Evaporator Coil Pan
Condenser
Compressor
Evaporator Coil Pan
An AC unit has a 3 ton capacity. What is the BTU ?
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36,000
24,000
48,000
12,000
36,000
What is a “Cross Connection” as it relates to Plumbing?
When wastewater can be siphoned into the water supply system
When dissimilar metals are used in a single plumbing run
Low water pressure in the supply system
A dielectric connector
When wastewater can be siphoned into the water supply system
What is the overall purpose of the Heating Inspection?
To identify the brand name of the heating unit
To identify major deficiencies in the heating system
To open all access panels on equipment
To verify a heat source in each room
To identify major deficiencies in the heating system
When a lit match is held at the barometric damper and leans inward toward the smoke pipe, this indicates what?
- A downdraft is occurring.下沉气流正在发生。
- Exhaust is moving up the chimney as it should be
- The damper is broken.
- Carbon monoxide is escaping into the home.
Exhaust is moving up the chimney as it should be
When evaluating the operation of an AC system during the summer months, the temperature differential between the supply and renew air should typically be?
15-20° F
10-15° F
15-30° F
20-25° F
15-20° F
Which of the following need NOT be observed as part of the Heating System Inspection?
- Ventilation in a furnace room
- An abnormal amount of soot in and around the furnace
- Underground oil storage tanks
- Gas burners inside the heat exchanger
Underground oil storage tanks
Capillary tubes are part of the:
Condenser coil
Compressor discharge
Heat exchanger
Evaporator coil
Evaporator coil
A natural draft unit has a draft fan.
True
False
Ｆ
Why is an open return within 10’ of a furnace or hot water heater a safety hazard?
It can damage the heat exchanger
It can cause backdrafting from hood drafts
It can restrict airflow to the furnace
It can pull leaking natural gas into the air supply
It can cause backdrafting from hood drafts
Forced-Air Furnaces function primarily by ________.
强制空气炉主要由。
Convection
对流
Radiation
辐射
Compression
压缩
Conductio
传导
Convection
对流
Like a blowdryer, Forced convection is a mechanism, or type of transport in which fluid流体 motion is generated生成 by an external外部的 source (like a pump, fan, suction device, etc.). It should be considered as one of the main methods方法 of useful heat transfer as significant重要的 amounts of heat energy can be transported very efficiently有效的.
When measuring the temperature drop across the evaporator in a Central Air Conditioning System, a properly running unit on a humid summer day should read:
25-35° F
5-15° F
35-45° F
15-25° F
１５－２５
When measuring the temperature drop across the evaporator in a Central Air Conditioning System, a properly running unit on a humid summer day should read:
15-25° F Most heat pumps average a 20 degree temperature drop
5-15° F - Not cold enough
25-35° F - too cold, likely to cause condensation
35-45° F - Way too cold, will condense in ductwork
Which of the following components of the HVAC System would typically be expected to last the longest?
- Heat pump
- Hot water boiler
- Gas furnace
- Compressor or air conditioner
Hot water boiler
Longest: BOILERS
Boilers20 to 35 years.
Furnaces – 20 to 30
Air conditioners – 15 to 20
Heat pumps – 10 to 20
Ductless mini splits – 10 to 30
In a forced air heating system containing a split system air conditioner and a humidifier humidity is reduced by:
Condensation at the evaporator coil
Condensation within the compressor
Running the humidifier in reverse
Condensation at the condenser coil
Condensation at the condenser coil
Condensation at the evaporator coil
蒸发器盘管处的冷凝
Condensation within the compressor
压缩机内冷凝
Running the humidifier in reverse
反向运行加湿器
Condensation at the condenser coil
凝汽器盘管冷凝
How can the Home Inspector identify a Steam Boiler?
A water level sight gauge on the boiler
An expansion tank in the attic
A pressure gauge on the boiler
The use of radiators for a heat source
A water level sight gauge on the boiler
Upon a call for heat for the thermostat, which components of a Tankless Hot-Water System are activated simultaneously?
当恒温器需要加热时，无水箱热水系统的哪些部件会同时启动？
The burner and the circulating pump
燃烧器和循环泵
The burner and the limit control
燃烧器和限位控制
The circulating pump and the pressure relief valve
循环泵和减压阀
The circulating pump and the low water cut-off
循环泵与低截流
The burner and the circulating pump
燃烧器和循环泵
The burner and the limit control – No, it is not over heating
燃烧器和限位控制——不，不是过热
The circulating pump and the pressure relief valve – No, it is not over pressure
循环泵和减压阀——不，没有超压
The circulating pump and the low water cut-off – No, the question says nothing about low water
循环泵和低水位断流器——不，问题不在于低水位
In tankless systems these 2 start simultaneously (The burner and the circulating pump)
在无油箱系统中，这两个同时启动（燃烧器和循环泵）
A Conventional Forced Warm-Air Furnace and a Mid-Efficiency Furnace have which element in common?
An intermittent pilot
A heat exchanger
An induced draft fan
A motorized vent dampe
A heat exchanger
A gas furnace is being installed in a brand new building. What is the most likely reason that an outdoor air source would be required?
- The building has unusually tight construction
- The furnace is classified as a high efficiency furnace
- The furnace is located in a closet
- The furnace has a capacity greater than 60,000 BTU
The building has unusually tight construction
Gas fired furnace heat exchangers most often fail from
- Lack of use
- Rust and metal fatigue
- Improper gas pressure
- Low temperatures
Rust and metal fatigue
What is the clearance for combustibles of a gas single-walled flue pipe ?
- 1”
- 6”
- 8”
- 12”
6 inch
When inspecting a heat pump, the Home Inspector should:
- Test it in the cooling mode if the temperature is over 55º.
- Test it in the cooling mode if the temperature is under 60º.
- Test it in both modes.
- Test it in the heating mode if the temperature is under 65º
Test it in the heating mode if the temperature is under 65º
When a large number of coils are immersed directly into the boiler water to supply hot water, this is known as?
A tankless coil system
A recycled condensation
A summer-winter hookup
An evaporative condenser
A tankless coil system
What are the types of heat that must be taken into account when calculating the cooling loads for an HVAC system?
在计算暖通空调系统的冷负荷时，必须考虑哪些类型的热？
Sensible and radiant heat
感热和辐射热
Sensible and latent heat
感热和潜热
Radiant and conductive heat
辐射热和传导热
Conductive and latent heat
传导潜热
Sensible and latent heat
感热和潜热
Latent and sensible heat are types of energy released or absorbed in the atmosphere. Latent heat is related to changes in phase between liquids, gases, and solids. Sensible heat is related to changes in temperature of a gas or object with no change in phase.
潜热和感热是大气中释放或吸收的能量类型。潜热与液体、气体和固体之间的相变化有关。显热与气体或物体的温度变化有关，而没有相位变化。
Sensible and latent heat
感热和潜热
While inspecting a heat pump in the cooling mode, you measure a 28°F temperature differential between the interior supply and return air. You should suspect:
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An exterior fan running too slowly
A thermostat set too low
A dirty filter
An overheating compressor
A dirty filter
28°F temperature differential is quite a lot, this would indicate a low air flow possibly due to a clogged filter.
If a cooling unit is in an attic where damage may result结果 from condensate overflow
Steel ducting is not allowed because of potential damage from condensation
An auxiliary condensate drain system is required
Attic ventilation must be increased to avoid condensation
A supplemental condensate pump is required
An auxiliary condensate drain system is required
What device on a heat pump allows it to operate in either a cooling or heating mode?
A gas burner beneath the outside coil
The Compressor
The Reversing Valve
The Evaporator and Condenser Coils
The Reversing Valve
In a typical residential air-conditioning system, the __________ absorbs吸收 the heat energy from the air passing through it, and transfers the heat energy from the passing air to the refrigerant moving inside it.
Evaporator
Humidifier
Condenser
Capillary Tube
正确答案
Evaporator
Under what conditions should the Home Inspector not fire up the Steam Boiler?
Clear water in the sight gauge
Dirty water in the sight gauge
A high water level and a low rust line in the sight gauge
No water in the sight gauge
No water in the sight gauge
What condition should the Home Inspector suspect怀疑 if there is a loud banging or knocking just after the Steam Boiler fires?
The Hartford loop is malfunctioning.
The limit control is faulty.
The water contains rust and mu
The pipes are not properly slope
正确答案
The pipes are not properly slope
Which of the following is not a component of an air conditioning system?
Condenser
Evaporator
Compressor
Ignitor
Ignitor点火器
At what pressure would the Pressure Relief Valve open on a Forced Hot-Water Boiler?
28 to 30 PSI
2 to 3 PSI
12 to 15 PSI
Water in a closed system is not under pressure.
28 to 30 PSI
Low pressure boiler pipes do not carry steam pressure above
12 PSI
15 PSI
6 PSI
9 PSI
15
The AC component which functions to put refrigerant gas under a high pressure is:
The Expansion Device
The Evaporator
The Condenser
The Compressor
The Compressor
If part of the air conditioning unit is in the attic and there is moisture on the ceiling below, what air conditioner component might be causing the moisture?
Condensor
Evaporator coil pan
Compressor
Fan
正确答案
Evaporator coil pan
Which of the following should be reported as an item near the end of its expected life?
Any Boiler
Any furnace over 20 years old
Any oil furnace
Any furnace over 10 years old
Any furnace over 20 years old
The heat source for an air to air heat pump is:
Outside air
The ground temperature
Electric resistors
Thermal pane
Outside air
The utility bills for heating and cooling a home are much higher than expected, Which of the following choices is probably not a reason for this increased cost?
The ductwork is poorly sealed
The ductwork is poorly insulated
The HVAC system has a plugged filter
The furnace is natural gas with plastic vent
正确答案
The furnace is natural gas with plastic vent
Medium efficiency furnaces have a draft inducer fan and are connected directly to the vent system instead of having a draft hood. There are white and yellowish deposits below the draft inducer fan. A possible explanation for these deposits is that
The furnace has failed and is unsafe to operate
The seal between the draft inducer fan and the furnace is failing
The draft inducer fan is not operating property
Moisture is condensing in the vent and running back into the draft inducer fan
正确答案
Moisture is condensing in the vent and running back into the draft inducer fan
When you mix nitric acid with the zinc in the galvanizing used to coat the steel. The byproducts of that burning gas are mostly water, nitrogen, sulphur and various other crud - basically nitric acid. Ever see the stuff that builds up on the zinc battery posts of a car? Same stuff.
How much you get depends on how well the furnace is venting. If it vents well, you’ll get almost none; if it’s not venting well, you’ll get a lot because there’s more condensation occurring inside the vent and you’ve got more acid there. That looks like a single-walled vent. Is it? If so, is it located in an unheated area or inside. If it’s located inside in conditioned airspace and you’re getting that much condensate residue you’ve definitely got some venting issues.
The __________ is located inside the outdoor condenser unit and receives the low-pressure refrigerant vapor through the suction line, and compresses or squeezes it into a smaller volume at a higher pressure.
Evaporator
Insulator
Compressor
Condenser
Compressor
While inspecting the furnace, you detect very high levels of carbon monoxide at the supply air registers. You should:
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Immediately shut off the main gas valve to disable the unit
Open windows, shutdown systems, advise immediate evaluation by HVAC contractor
Explain that the unit will need servicing in the future to prolong its life
Advise that everyone run out of the house for safety
正确答案
Advise that everyone run out of the house for safety
How might you test for a down-drafting condition with a gas water heater?
Trip the relief valve.
Watch the flame in the heating chamber.
Mirror will become fogged when held next to the draft hoo
Smell around the gas control valve and at unions and connections in the gas lines.
正确答案
Mirror will become fogged when held next to the draft hoo
