Skills and Trades

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What is the common operating voltage range on the cells of electronic air cleaners? A) 6,000 to ... Started by tth	1 Replies 66 Views	Jul 24, 2018 by bigsis44
What happens to the flash gas formed in a chiller economizer? A) It is piped to a later stage in ... Started by cartlidgeashley	1 Replies 13 Views	Jul 24, 2018 by Awesome
What allows the safety relay to operate? A) Increasing the current flow B) Shutting off the ... Started by anshika	1 Replies 56 Views	Jul 24, 2018 by bigcheese9
How is an HTM calculated? A) Add the R values of the different materials and then find the ... Started by elizabeth18	3 Replies 17 Views	Jul 24, 2018 by choc0chan
How are the indoor sections of mini-split heat pump systems normally installed? A) The indoor ... Started by LCritchfi	1 Replies 92 Views	Jul 24, 2018 by bassamabas
During an operational check of an air-conditioning system, you should check the: A) Temperature ... Started by james0929	1 Replies 61 Views	Jul 24, 2018 by JYan
What maintenance does an electronic air cleaner require? A) Periodically cleaning the ionized ... Started by lidoalex	1 Replies 29 Views	Jul 24, 2018 by mbcrismon
Refrigerant vapor removed from the oil travels directly to the: A) Cooler outlet. B) Cooler ... Started by Kikoku	3 Replies 83 Views	Jul 24, 2018 by meganlapinski
What effect does the daily range have on heat gain? A) Areas with a high daily range can take ... Started by tnt_battle	1 Replies 212 Views	Jul 24, 2018 by lou
While very effective at removing small contaminants, HEPA filters are not used in residential ... Started by jilianpiloj	1 Replies 37 Views	Jul 24, 2018 by mmj22343
In thermostat wiring, the common industry color standard for wiring uses a white wire to control ... Started by TFauchery	1 Replies 48 Views	Jul 24, 2018 by 31809pancho
The grains of moisture difference in the weather data tables are used for calculating: A) The ... Started by dollx	3 Replies 20 Views	Jul 24, 2018 by ju
The most common time to perform a seasonal check on cooling equipment is in the: A) Fall. B) ... Started by asd123	1 Replies 43 Views	Jul 24, 2018 by miss.ashley
On a single-pipe system, it is necessary to purge air from which component? A) Inlet strainer B) ... Started by jhjkgdfhk	1 Replies 47 Views	Jul 24, 2018 by flexer1n1
In a dual-fuel heat pump, what operates when second-stage heat calls? A) The electric heat strips ... Started by 09madisonrousseau09	1 Replies 318 Views	Jul 24, 2018 by laurnthompson
In Manual J, fenestration means: A) The material used to seal around openings. B) A barrier ... Started by chads108	3 Replies 44 Views	Jul 24, 2018 by ky860224
One disadvantage of the highest MERV rated filters is that: A) The pressure drop across high MERV ... Started by soccerdreamer_17	1 Replies 71 Views	Jul 24, 2018 by fatboyy09
During the vapor recovery phase, what is pumped from the condenser to the storage tank? A) ... Started by penza	1 Replies 26 Views	Jul 24, 2018 by zacnyjessica
In selecting the outside cooling design conditions for Manual J8, a temperature is chosen for each ... Started by fox	1 Replies 44 Views	Jul 24, 2018 by paavo
Where is solid 18 gauge copper wire typically used in residential air-conditioning installation? ... Started by 09madisonrousseau09	3 Replies 83 Views	Jul 24, 2018 by ttt030911
Which types of oil feed system are generally self-purging? A) Two-pipe oil feed systems B) Both ... Started by vicky	1 Replies 91 Views	Jul 24, 2018 by jesse.fleming
How should refrigerant be recovered from a chiller? A) Always begin the refrigerant recovery ... Started by sam.t96	1 Replies 104 Views	Jul 24, 2018 by stillxalice
The main types of overcurrent protection used for a condensing unit are: A) Magnetic overload ... Started by dmcintosh	1 Replies 24 Views	Jul 24, 2018 by Expo
What could happen if you charge liquid refrigerant into a chiller that is under a deep vacuum? A) ... Started by vicotolentino	3 Replies 52 Views	Jul 24, 2018 by xMRAZ
Why is the cooling temperature difference often different from the difference between the indoor and ... Started by bio_gurl	1 Replies 24 Views	Jul 24, 2018 by amynguyen1221