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Property Inspection Module 2 > Cooling System > Flashcards

Cooling System Flashcards

1
Q

_____ _____ _____ is a measurement of the amount of heat required to increase 1 lb of water by 1 degree F.

A

British Thermal Unit or BTU

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2
Q

_____ _____ _____ _____ is a measure of efficiency of a heat pump in heat mode shown by dividing the heating output by the energy used.

A

Heat Seasonal Performance Factor or HSPF

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3
Q

_____ _____ is the amount of water vapor that an air conditioner must remove from the air inside a house before the system can begin removing sensible load heat.

A

Latent load

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4
Q

The _____ _____ is the small, hot, high pressure copper tubing in a line set that is usually uninsulated. By contrast, the _____ _____ is the large, cool, low pressure copper tubing that is usually insulated.

A

Liquid line
Suction line

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5
Q

_____ or _____ is a refrigerant used in older systems that has been phased out and replaced with _____.

A

Freon or R-22
R-410A

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6
Q

_____ _____ _____ ______ is a measure of heat pump efficiency in cooling mode obtained by dividing the cooling output over a cooling season by the energy used. Minimum rating is currently _____ for most of the US.

A

Seasonal Energy Efficiency Ratio (SEER)
14

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7
Q

_____ _____ is the amount of heat energy that an air conditioning system must remove from the air inside a home due to air temperature.

A

Sensible load

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8
Q

_____ is a unit of measure of the size or cooling capacity of an air conditioning system equal to _____ BTU per hour.

A

Ton
12,000

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9
Q

_____ and _____ cooling systems are uncommon and are out of scope of a home inspection. _____ source and _____ source heat pumps are also out of scope. The inspector should report the presence, disclaim inspection, and recommend evaluation by a specialist.

A

Radiant and absorption
Ground source and water source

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10
Q

Liquid line temperature at the condenser should be a few degrees _____ than the outside temperature.

A

warmer

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11
Q

Standard efficiency air conditioning systems use metering devices called _____ _____ _____. Higher efficiency units use a ____ _____ _____.

A

thermostatic expansion valves (TXV or TEV)

electronic expansion valves (EEV)

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12
Q

One method of estimating how much heat is being removed from a house is by subtracting the difference in _____ between the ______ _____ and _____ _____ at the _____.

A

temperature
suction line
liquid line
Compressor

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13
Q

A heat pump is switched into heating mode when the _____ ______ is energized to _____ refrigerant flow.

A

reversing valve
reverse

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14
Q

In heating mode, the refrigerant leaving the air handler should be a few degrees _____ than inside temperature.

A

warmer

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15
Q

When a heat pump is in heating mode and the outside air temperature reaches around _____ degrees F, the system become inefficient and the _____ _____ are activated in the air handler to heat air.

A

30
heat strips

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16
Q

When a heat pump is operating in heat mode and operating near or below ______ degrees F, _____ may form on condenser fins causing the system to _____ flow momentarily to _____ the system.

A

32
frost
reverse
defrost

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17
Q

An air conditioning system that is too large may suffer from a condition called _____ _____, in which the system activates and deactivates too quickly. Since an air conditioner takes between ___ and ___ minutes to reach peak efficiency, this condition will cause increased operating costs. It will also prevent the system from performing _____.

A

Short cycling
10 and 20
Dehumidification

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18
Q

_____ calculation estimates the latent and sensible loads for a house.

A

Manual J

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19
Q

General rules dictate that a poorly insulated home with single pane windows requires _____ + BTU / 1,000 sq ft. A well insulated, air-tight home with multi-pane windows would only require _____ BTU / 1,000 sq ft. However, inspectors should be wary of using general rules to determine if a system is improperly sized because they often produce significantly _____ _____.

A

800
400
inaccurate results

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20
Q

The visual inspection of HVAC systems includes opening _____ _____ provided for _____ _____ and _____ and that are not _____ _____ _____. As a general rule, heat pump air handlers, evaporator coils, condensers, and package HVAC appliances _____ homeowner serviceable parts inside.

A

access panels
homeowner inspection
maintenance
sealed in place
do not have

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21
Q

Operating the air conditioner below __ degrees F risks the following: damaging the system by _____ ___ _____ , causing ____ to form in the evaporator coils, or obtaining _____ __ _____ test results.

A

60
slugging the compressor
ice
inaccurate or misleading

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22
Q

_____ _____ can be an inaccurate indicator of air conditioning system performance, even more so when the system is operating outside of normal _____ _____.

A

Temperature drop
operating temperatures

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23
Q

Ground and roof mount HVAC package systems should have a _____ to protect the ductwork. It should be _____ _____, _____, and _____. Roof mounted systems are usually supported on _____ _____ angle iron and _____ _____ to the roof.

A

shroud
corrosion resistant
intact
watertight
adequately secured
adequately secured

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24
Q

The typical service life of a condenser unit is approximately __ years, however one near a saltwater environment can be as short as __ years. The evaporator coil, furnace, and air handler have an expected service life of __ years or more.

A

15
5
20

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25
Q

HVAC components from different _____ should not be installed together. Inspectors should consider reporting the presence of such, and recommend evaluation to determine compatibility by an HVAC contractor.

A

manufacturers

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26
Q

Evaporative cooler water supply should be protected with a ______ prevention device.

A

backflow

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27
Q

Inspectors should report if an evaporative cooler has been left ____ or if the water supply is not protected by a _____ _____ _____. These systems are required to be mounted at least __ ft above or __ ft below contaminate air sources such as plumbing vents, appliance vents, and chimneys.

A

abandoned
backflow prevention device
10
3

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28
Q

Condenser model and serial numbers are usually located on a label near where the _____ _____ _____ enters the condenser.

A

refrigerant line set

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29
Q

When measuring _____ _____ in air conditioners, the measurement error is too great to make measuring at _____ and _____ _____ useful. The ideal place is the _____ and _____ _____ at least __ in away from the evaporator coil.

A

temperature drop
supply and return registers
supply and return plenums
12

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30
Q

Minimum finished attic access opening size is __ by __ in. Minimum finished crawl space access opening is __ by __ in. Appliances in attics and crawl spaces should be located within __ ft of the access opening and provided a _____ service space at least __ by __in for all sides of the appliance that require service. A __in wide passageway covered by floor sheathing should lead from the access opening to the service space.

A

20x30
22x30
20
level
30x30
24

31
Q

In a humid climate, a temperature drop measured in a cooling system between __ and __ degrees F is considered normal by most inspectors. In a dry climate, numbers between __ and __ degrees F are considered normal. However these numbers can vary and inspectors _____ report that a “normal” temperature drop indicates the system is operating as intended.

A

15 and 20
18 and 24
should not

32
Q

Manufacturers commonly require that condenser units have at least __ in of clearance in front of the service access, __ to __ in on the sides, __ in above, in addition to the bottom being located at least __in above grade.

A

30
6 to 12
48
3

33
Q

Condenser units required at least __ ft clearance to clothes dryer exhaust vents.

A

3

34
Q

Most manufacturers require the indoor unit of a mini-split system to be installed a minimum of __ to __ ft above the finished floor.

A

5-6

35
Q

The evaporator coil creates a significant amount of water from condensation, which must be sent to an appropriate place for _____. This usually accomplished via a _____ _____ _____ that is at least ____ in diameter and must slope at least _____ in per foot towards the disposal point. Some jurisdictions in warm/humid climates require the pipe be _____.

A

disposal
condensate disposal pipe
3/4
1/8
insulated

36
Q

A _____ _____ _____ _____ is required if the evaporator coil is located where condensate could damage nearby materials, which is usually anywhere inside a home. Usually, a _____ is placed under the evaporator coil which is at least ___ in deep and extends at least ___ in beyond the evaporator on all sides. The _____ is usually drained to the outside in the same manner as the primary disposal pipe.

A

Auxiliary condensate management system
Pan
1 1/2
3
Pan

37
Q

Another auxiliary system in dealing with condensate, a _____ ______ ______ _____ may be installed in either the evaporator as an auxiliary system or in the pan to support the auxiliary system. This will cause the air conditioner to ___ ___when condensate is blocked at either point.

A

Water level shutoff switch
Shut off

38
Q

Most manufacturers recommend a maximum of __ ft spacing between supports for refrigerant line set. The line set should not _____ or ____. Supports should be compatible with ____ to avoid _____.

A

8
sag or crimp
copper
corrosion

39
Q

Maximum line set distance is __ ft and maximum vertical distance is __ ft to avoid issues with _____. These distances are less for _____ _____ systems.

A

60
25
efficiency
mini-split

40
Q

_____ _____ insulation should be intact over the entire length of the line set. The _____ _____ may require insulation in areas where attic is extremely hot. Line set may be buried if _____ in a _____ _____ _____. Line set penetration into house should be ______.

A

suction line
liquid line
enclosed
protective pipe sleeve
sealed

41
Q

_____ thermostats should be level to avoid inaccurate operation. Digital thermostats use a _____ to measure temperature and should be _____ however being level is less important.

A

analog
thermistor
secure

42
Q

The best location for a thermostat is in a _____ near a _____. It should not be located near _____ registers, _____, or other _____ or cooling sources. Do not place them near _____, _____, _____, or where _____ will _____ on the thermostat.

A

hallway
return
supply
radiators
heating
windows, exterior doors, exterior walls
sunlight will shine

43
Q

Thermostats operate on _____ voltage, such as __ or __ volts. Splices or connections _____ required to be covered in a box, but the thermostat cable must have a _____ where it enters a metal enclosure.

A

low
12 or 24
are not
grommet/bushing

44
Q

A room facing south or west often requires a _____ duct for cooling than a room facing north or east. Inadequate duct size is a common reason for _____ _____ _____ between rooms.

A

larger
temperature balancing problems

45
Q

_____ _____ installation is another reason for temperature balancing problems. Problems that could result include comfort complaints, increased HVAC system _____ _____ and _____, reduced _____ _____, and _____ control problems.

A

improper duct
operating time and cost
service life
moisture

46
Q

Direction changes in ductwork should be planned and accounted for in the _____ calculations and implemented using appropriate _____ and technique.

A

Manual D
fittings

47
Q

Poor planning in ductwork may result in _____ _____ from a straight line resulting in _____ bends, _____ of duct size, and _____ ducts.

A

unplanned deviations
sharp
constriction
sagging

48
Q

Preferably, _____ _____ _____ should be along exterior wall near a window. _____ _____ _____should be located in the opposite vertical direction to assist air circulation. _____ and _____ can help reduce the impact of less than ideal supply and return air locations.

A

supply air registers
return air inlets
registers and diffusers

49
Q

Rooms with doors that can be closed, namely bedrooms, should have a method of allowing _____ _____ that enters the room to _____ to the HVAC system, which is usually accomplished by installing _____ or _____ that connect the room to a central hallway return. These are often referred to as _____ or ______.

A

supply air
return
ducts or grilles
transfers or jumpers

50
Q

A multiple story house with only one HVAC system will often be _____ on one story and _____ on the other. _____ _____ _____ may help, but likely will not completely solve the issue. Lack of separate HVAC systems for each story is not necessarily a deficiency, however the inspector should comment about ______ _____ _____ in such houses.

A

hotter
colder
thermostat controlled dampers
temperature distribution problems

51
Q

_____ _____ and _____ _____ _____ were commonly used as return plenums in homes, however this is no longer allowed in new homes. Cavities may not be used for _____ plenums and cavities on _____ walls, or those used in a _____ ______ assembly are excluded from either use.

A

stud wall and floor joist cavities
supply
exterior
fire resistant

52
Q

Flex duct should be supported by at least __ in wide material every __ ft horizontally and every __ ft vertically. It should also be supported within __ ft or or 1 duct diameter, whichever is smaller, of both sides of all bends and fittings.

A

1 1/2
4
6
1

53
Q

Flexible ducts should not sag more than __ in per foot in length.

A

1/2

54
Q

_____ should be supported independently from ducts.

A

Plenums

55
Q

Sheet metal ducts should be supported by at least __ in wide metal wire or straps at least every __ ft.

A

1/2
10

56
Q

Duct board should be supported by __ in wide material at least every __ to __ ft.

A

1 1/2
6 to 8

57
Q

Supply duct leakage reduces _____ and _____ _____ to rooms while increasing system _____ _____.

A

efficiency
air flow
operating costs

58
Q

Return duct leakage can introduce _____ such as _____, _____, and _____ into the HVAC system and into the house.

A

contaminants
dust, fungus, vermin

59
Q

_____ tape is NOT an approved method for sealing joints in ducts. Approved methods include _____, _____ _____and _____ _____ _____ _____.

A

duct
gaskets
mastic tape
pressure sensitive foil tape

60
Q

Sheet metal ducts are secured with _____ or _____ _____, while flexible ducts are usually secured to duct collars and splicing sleeves with _____ or _____ _____.

A

screws
pop rivets
straps
zip ties

61
Q

A 90 degree bend in flex duct can effectively add __ ft of length to a duct in terms of airflow.

A

20

62
Q

The radius of a bend in flex duct should be greater than or equal to the _____ of the duct, which equates to a maximum duct bed of __ degrees. Flex duct should not bend over or around _____ such as _____ _____.

A

diameter
90
obstructions
framing members

63
Q

_____ _____ _____ allow one HVAC system to supply air to multiple zones or floors of the house.

A

Thermostat-controlled dampers

64
Q

Air pressure differences caused by multi-zone HVAC systems can be resolved by a _____ _____ between the _____ and _____ _____ containing a _____ _____ that will open and close to equalize the pressure in the system as needed.

A

jumper duct
supply and return plenums
barometric damper

65
Q

Flex duct should be spliced together using a _____ _____ _____ and a duct should not be inserted into _____ _____.

A

sheet metal sleeve
another duct

66
Q

Ducts should be installed at least __ in above soil.

A

4

67
Q

_____ or _____ on supply registers is an indication of high humidity in the house.

A

Significant condensation or rust

68
Q

_____ should not be installed on return air ducts.

A

Dampers

69
Q

An HVAC system that serves the house should not have any _____ or _____ in the garage. A system that serves only the garage may only have ducts made of _____ _____.

A

ducts or openings
sheet metal

70
Q

Since _____ _____ _____ will degrade system efficiency and performance, inspectors may consider removing _____ _____ _____ before conducting a _____ _____ measurement.

A

insufficient return air
extremely dirty filters
temperature drop

71
Q

Return air should not be taken directly from ___, ___, ___, ___, ___, ___, or ___.

A

closets, bathrooms, toilet rooms, kitchens, garages, furnace/boiler rooms, unconditioned attic/crawl space

72
Q

Return inlets located near fuel burning appliances may contribute to _____ of _____ _____ and should not be located in the same room within ___ ft of the appliance.

A

backdrafting of combustion gases
10

73
Q

Mesh return filters should be changed _____ and paper filters may need to be changed _____ _____ than is ______ on the _____.

A

monthly
more frequently
implied on the packaging

74
Q

Return filters should not be located in a return boot at the _____ _____ or _____.

A

air handler or furnace

Property Inspection Module 2 (14 decks)

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