Unit 36 and 37 HVAC
two names for the interconnecting piping in a split air-conditioning system are
Suction (cool gas) and liquid.
The outside design temperatures in the summer in Tucson, Arizona for 2.5 % of the time are________________F. dry bulb and _________F. Wet bulb?
102 F Dry bulb and 66 F Wet bulb.
In the southwester United States on a 90 F, the condensing temperature for a standard air-conditioning system would be approximately ?
120 F
PUTING TRUMP DUCT OR EXTENDING SECTION OF THE PLENUM TOGEHDER WHAT IS THE NAME OF THE DEVICE CALL IT?
DRIVE CLIP AND S CLIP
EVAPORATOR THAT HAVE MORE THAN ONE SQUAL CIRCUIT WHY?
TO REDUCE PRESSURE OF REFRIGERANT GOINT THRUGH
Thera are two basic types of A/c Units ?
The Package type and the split system
The____________ Expansion device ordinarily must use a compressor with a high starting torque
Thermostatic
DUCT SYSTEM PRESSURE ARE MEASURE IN
WATER COLUMN
The fins on an evaporator coil are made of?
aluminum
On January 1 of ______________, manufacturers were no longer allowed to use R-22 in new air-conditioning equipment
2010
The total production phaseout for R-22 will occur in?
2020
The design boiling point for most evaporator coils in residential air-conditioning is ____________________F
40 F
The air leaving the air handler in a typical air-conditioning system is approximately ______________at design conditions?
55 F
The split system ?
All the compressor and the condenser are located outside
AIR TEMPERATURE OF AIR OFF EVAPORATIVE COLLER IS WHAT CONDITION ?
COOLER THAN THE AMBIENT AIR
IF WE ARE IN A EXPOSURE OF SAL AND SAND FROM BEACH AIR WHAT WULD BE TYPICAL COMBINATION OF THE METAL FOR THE CONDESING COIL OR EVAPORATOR COIL?
CORROSION FROM THE SAL AND THE SAND !! COOPER TO COOPER WILL BE IDEAL FOR THAT ENVIROMENT
Most compressor are cooled using the?
Cool suction Gas
SPLIT SYSTEM AC WITH A REMOTE CONDENSER REFRIGERANT LINES WICH KIND MUST BE FIELD INSTALLED ?
DISCHARGE AND LIQUID LINE.
The four major component of an air-conditioning system are
Evaporator, condenser, compressor, and metering device .
BURMID DOES NOT PERFORM BEST EFICENCY WHEN RUNING IN FULL LOAD?\
FALSE
OVERSIDE DUCT SYSTEM ARE MORE INEXPENSIVE TO INSTALL TO RESULT IN THE AIR SLOWING DOWN AS IS CLOSE TO THE DUCT, TRUE OR FALSE?
FALSE
USING VIBRATION ELIMINATOR BETWEEN TWO SECTIONS METAL RUBBER OF THE DUCTS SHOULD BE RUBBERING EACH OTHER TRUE OR FALSE?
FALSE
TYPICAL EVAPORATOR AND CONDENSER ARE COOPER TUBE ON STAINLESS STEAL FIN TRUE OR FALSE?
FALSE COOPER TUBE WITH ALUMINUM FINS
HIGH EFFICIENCY CONDENSOR HAVE STAINLESS STEAL COILS TRUE OR FALSE?
FALSE, THEY HAVE MORE SURFACE AREA
1.- True or False? Evaporative air-conditioning will work in an climate?
False
The solar load on a structure is the load resulting from the?
Heat from the suns radiation.
FITING AT THE END OF A ROUND DUCT CONECT DUCT TO THE FLOOR REGISTER IS CALL TAKE OFF? FALSE IS CALLED REGISTER BOOTH
IN THE BOOTH
On a package air conditioning system, which refrigerant lines must be field installed?
IS A PACKAGE UNIT!!!!!!
ALUMINUM COILS HAVE A HIGH HEAT TRANSFER THAN STANDAR COOPER ALUMINUM COILS ? TRUE OR FALSE
IS TRUE AND COOPER ARE THE SAME HEAT TRANSFER ALUMINUM IS CHEAPER .
The supply-air duct in an air-conditioning system installed in an unconditioned space _______need to be insulated?
It does need to be insulated
What advantage does a capillary tube have over a thermostatic expansion valve?
Lees expensive and simpler
The small Interconnecting line between the indoor and the outdoor coil is the___________________line.
Liquid line
TH E REAZON FOR USING REDUCING EXTENDUM AIR SYSTEM IS TO PROVIDE
MANTIAN PRESSURE THROW THE ENTIRE AIR LINE.
Home owner want to build new house vegas nevada to reduce or lower to solar load what side of the house will be most of the windwos should be on
North and south
The package type A/c what are the components located?
Package has all the component build in the cabinet .
A refrigerant blend replacing R-22 in new residential and commercial air-conditioning applications is ?
R -410 A
The most popular refrigerant used in the past for residential air-conditionig is R-________
R-22
A refrigerant blend replacing R-22 in residential and commercial air-conditioning applications that can be used in retrofit applications is?
R-407 C
What refrigerant blend can be used in retrofit applications as a long-term replacement for R-22 in residential and light commercial air-conditioning applications?
R-407C
What are two high -efficiency refrigerant blends that can be used as long-therm replacements for R-22 in residential and light-commercial air conditioning applications?
R-410A and R-407C
What are the three most common types of compressor used in air-conditioning ?
Reciprocating, Rotary and Scroll
What are the advantages of using refrigerated air-conditioning than evaporative conditioning?
Refrigerated air-conditioning removes humidity, does not force fresh air in from the outside and makes it easier to control condition.
A compressor that has a stationary vane is the___________________compressor
Rotary
What two types of heat are removed by the evaporator coil in the air-conditioning process?
Sensible heat and latent heat
The Large interconnecting line between the indoor and outdoor coil is the ___________line.
Suction Line
Two types of expansion devices in residential air-conditioning are ?
Thermostatic expansion valve and fixed-bore device.
More than one evaporator coil circuit may be use when ?
They would be excessive refrigerant pressure drop
air blown into a structure through an evaporative cooler (swamp cooler) tends to ____ than the outside air.
be more humid.
some heat leaks into a structure by ?
conduction, infiltration and radiation.
The thermostatic expansion valve?
does not allow the pressure to equalize during the off cycle unless specifically designed to do so
High-efficiency condensers are ?
have more surface are than standard condenser
Dirty condenser coil can give you what problems?
high Pressure, and affect the eficency
infiltrated air of the same dry-bulb temperature may vary from one part of the country to another because of the difference in
humidity
What Advantages does a thermostatic expansion valve have over a capillary tube?
it maintains better control of the flow of refrigerant in the evaporator, more accurate superheat, and more active evaporator.
The dew point temperature tells you how much ____________is in the air?
moisture
In the package air-conditioning system the evaporator will normally located ?
outside of the house
The cooling for modern, reciprocating fully hermetic compressor used in air-conditioning is controlled by or directly from
suction Gas
The evaporator is a refrigerant coil made of aluminum or cooper with aluminum fins for what reason?
to give it more surface are a for a better heat exchange.
