Skills and Trades

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To avoid cutting extra holes in the roof, power is normally provided to curb-mounted rooftop units: ... Started by anjilletteb	3 Replies 81 Views	Jul 24, 2018 by mochi09
Proper height above the roof is important when installing a heat pump rooftop unit: A) So that ... Started by penguins	1 Replies 126 Views	Jul 24, 2018 by momolu
What type of blower configuration requires a water-filled P-trap to ensure proper condensate ... Started by imanialler	1 Replies 73 Views	Jul 24, 2018 by nothere
The raised, rectangular sheet metal frame that a rooftop unit rests on is called a: A) Fixture. ... Started by BrownTown3	1 Replies 38 Views	Jul 24, 2018 by DylanD1323
What is the primary design challenge for CO2 refrigeration systems? A) The high refrigerant cost ... Started by SO00	3 Replies 62 Views	Jul 24, 2018 by dudman123
Gas pressure should be checked at the rooftop valve prior to installation. The gas line pressure for ... Started by sdfghj	1 Replies 132 Views	Jul 24, 2018 by TheNamesImani
Gas-fired rooftop units are normally vented through: A) Draft hoods connected directly to the ... Started by frankwu	1 Replies 53 Views	Jul 24, 2018 by rekilledagain
To calculate the CFM required to provide a given number of air changes in a building, you need: ... Started by luminitza	1 Replies 25 Views	Jul 24, 2018 by manuelcastillo
The typical start up sequence for a hot surface ignition system is: A) Combustion blower ... Started by mikaylakyoung	3 Replies 40 Views	Jul 24, 2018 by atrochim
An energy recovery ventilator: A) Exchanges sensible heat between the intake and exhaust air ... Started by jon_i	1 Replies 31 Views	Jul 24, 2018 by randomguy133
What is the possible cause for ice sticking and not releasing during the harvest cycle? A) A ... Started by tsand2	1 Replies 29 Views	Jul 24, 2018 by Rilsmarie951
Electrical components can generally be divided into two groups: A) Pilot duty and line duty. B) ... Started by gonzo233	1 Replies 125 Views	Jul 24, 2018 by peter
Why should the heating element of a hot-surface igniter NOT be touched when installing a replacement ... Started by debasdf	3 Replies 253 Views	Jul 24, 2018 by joneynes
An electric furnace that runs continuously, regardless of the thermostat setting, probably has: ... Started by fasfsadfdsfa	1 Replies 17 Views	Jul 24, 2018 by scrocafella
What is the purpose of a reheat coil when dehumidifying? A) To prevent the air from freezing. B) ... Started by bclement10	1 Replies 14 Views	Jul 24, 2018 by DylanD1323
What effect on the building pressure does a heat recovery ventilator have? A) It decreases ... Started by Davideckstein7	1 Replies 20 Views	Jul 24, 2018 by asdfasdf
An electric furnace that does not operate, regardless of the thermostat setting, may have: A) An ... Started by faduma	3 Replies 64 Views	Jul 24, 2018 by Fayaz00962
A heat recovery ventilator is more energy efficient than a balanced ventilation system consisting of ... Started by Sportsfan2111	1 Replies 25 Views	Jul 24, 2018 by Swizqar
An electric furnace operates, but produces less heat than it used to produce. Which of the following ... Started by tiffannnnyyyyyy	1 Replies 80 Views	Jul 24, 2018 by duy1981999
What is the usual setting for the limit on the fan/limit switch of a warm air furnace? A) 180F to ... Started by crobinson2013	1 Replies 55 Views	Jul 24, 2018 by whitcassie
What could cause a false high reading for the supply-air temperature? A) The temperature is taken ... Started by yoroshambo	3 Replies 63 Views	Jul 24, 2018 by smrerig
Why is it possible to use smaller vent pipes in higher-efficiency units? A) The temperature of ... Started by renzo156	1 Replies 57 Views	Jul 24, 2018 by ASDFGJLO
A normal operational refrigerant release would be: A) Venting refrigerant to correct an ... Started by khang	1 Replies 90 Views	Jul 24, 2018 by amit
How do the recovery levels for Type III equipment differ from recovery levels for other types of ... Started by ec501234	1 Replies 57 Views	Jul 24, 2018 by DylanD1323
The recovery level for Type III systems using a recovery device manufactured after November 15, ... Started by geoffrey	3 Replies 141 Views	Jul 24, 2018 by Hikerman221