Skills and Trades

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The first step in troubleshooting a system is: A) Replacing defective components. B) Recognizing ... Started by oliviahorn72	3 Replies 16 Views	Jul 24, 2018 by ririgirl15
Fault isolation diagrams and troubleshooting tables help the technician locate problems through the ... Started by fagboi	1 Replies 101 Views	Jul 24, 2018 by Sophiapenny
What is the total system charge for a system with a factory charge of 56 oz of R-410A, an assumed ... Started by beccaep	1 Replies 205 Views	Jul 24, 2018 by peter
If some components are not functioning, and the system has line and control voltage, you should ... Started by j.rubin	1 Replies 26 Views	Jul 24, 2018 by ririgirl15
What is a common symptom of a severely restricted filter drier? A) High amp draw on the ... Started by audie	3 Replies 27 Views	Jul 24, 2018 by jonathanballen97
Which of the following is a practical use of a solar system? A) Use a solar collector to control ... Started by dejastew	1 Replies 41 Views	Jul 24, 2018 by braelync
When the liquid line is restricted, the supply of refrigerant to the metering device is reduced. ... Started by oliviahorn72	1 Replies 60 Views	Jul 24, 2018 by vkodali
What is the minimum furnace size for which the fire department should be called to be on standby ... Started by dejastew	1 Replies 57 Views	Jul 24, 2018 by babybsemail
Hopscotching is the technique that requires you to start at a point with correct voltage and then ... Started by Alygatorr01285	3 Replies 18 Views	Jul 24, 2018 by Rilsmarie951
How does the refrigerant charge affect a system's subcooling? A) The refrigerant charge does not ... Started by pane00	1 Replies 51 Views	Jul 24, 2018 by T4T
Why is low water a dangerous condition for a boiler? A) A boiler that is low on water will have ... Started by student77	1 Replies 52 Views	Jul 24, 2018 by SVictor
How does a closed expansion tank work? A) It uses a flexible diaphragm with an air charge above ... Started by danielfitts88	1 Replies 34 Views	Jul 24, 2018 by javimendoza7
The manufacturer's data on a split AC system indicates that the normal temperature drop should be ... Started by Pineapplelove6	3 Replies 15 Views	Jul 24, 2018 by Kaytorgator
Open-loop water-source systems normally draw the water from: A) City water. B) A deep well. C) A ... Started by lb_gilbert	1 Replies 105 Views	Jul 24, 2018 by mcabuhat
The suction pressure on a split AC system that is running with an excessive evaporator heat load: ... Started by jerry coleman	1 Replies 50 Views	Jul 24, 2018 by af
What should be done if a furnace with a tripped primary control has oil is in the combustion ... Started by bobthebuilder	1 Replies 90 Views	Jul 24, 2018 by dyrone
In an induced-draft gas furnace, the first component to energize on a call for heat is: A) The ... Started by mpobi80	3 Replies 43 Views	Jul 24, 2018 by samiel-sayed
What might be the problem if the furnace runs, but with short cycles? A) Cracked heat exchanger ... Started by Diane	1 Replies 42 Views	Jul 24, 2018 by dominiqueenicolee
What is the normal charge on a residential diaphragm type of expansion tank? A) 60 psig B) 160 ... Started by krzymel	1 Replies 16 Views	Jul 24, 2018 by Kaytorgator
What is a secondary refrigerant? A) A secondary refrigerant adds extra cooling capacity to the ... Started by ahriuashd	1 Replies 63 Views	Jul 24, 2018 by randomguy133
What might be the problem if there are carbon deposits on the refractory? A) Cracked heat ... Started by future617RT	3 Replies 86 Views	Jul 24, 2018 by alvinum
What is a low water cutout? A) It is an operating control that energizes the water fill solenoid ... Started by bio_gurl	1 Replies 39 Views	Jul 24, 2018 by Expo
When charging a capillary tube system that holds 100 oz., the charge must be: A) Within 5 ... Started by littleanan	1 Replies 37 Views	Jul 24, 2018 by nothere
The indoor fan on an oil furnace is controlled by: A) A temperature-sensing fan switch. B) A ... Started by sarasara	1 Replies 69 Views	Jul 24, 2018 by amit
What controls the firing of a water boiler? A) The auxiliary switch on the zone valve B) An ... Started by vinney12	3 Replies 23 Views	Jul 24, 2018 by shewald78