Skills and Trades

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Why are the 90 percent condensing furnaces unique? A) The flue gas affects the venting material ... Started by ericka1	1 Replies 69 Views	Jul 24, 2018 by kishoreddi
Why would a 35F medium-temperature case need to defrost? A) It is common for water to freeze at ... Started by WhattoUnderstand	1 Replies 160 Views	Jul 24, 2018 by ecabral0
The four categories of gas-fired furnaces are based on: A) Efficiency. B) Flue gas temperature ... Started by jon_i	1 Replies 49 Views	Jul 24, 2018 by kxciann
After making a belt or pulley adjustment to a belt drive fan, it is crucial to check: A) The ... Started by jerry coleman	3 Replies 130 Views	Jul 24, 2018 by Kaytorgator
The two most common categories of gas-fired furnaces are: A) Category I and Category IV. B) ... Started by mikaylakyoung	1 Replies 30 Views	Jul 24, 2018 by maaaaaaaaaa
What refrigeration component makes it possible to use a single compressor to control multiple cases ... Started by littleanan	1 Replies 76 Views	Jul 24, 2018 by mjbamaung
A Category IV furnace operates with a: A) High-temperature, positive-pressure vent. B) ... Started by neverstopbelieb	1 Replies 55 Views	Jul 24, 2018 by rekilledagain
When will installation technicians most likely install a horizontal furnace? A) When there is ... Started by washai	3 Replies 23 Views	Jul 24, 2018 by nanny
This type of fan is commonly used on condenser motors because it moves high volumes of air in low ... Started by bb	1 Replies 19 Views	Jul 24, 2018 by nanny
What is commonly used to control defrost operations? A) Defrost timer B) Door switch C) Electric ... Started by vicotolentino	1 Replies 101 Views	Jul 24, 2018 by Brenm
What is the approximate ventilation requirement for low-temperature, air-cooled condensing units ... Started by aabwk4	1 Replies 31 Views	Jul 24, 2018 by batool
The defrost cycle is normally terminated: A) Based strictly on pressure to ensure safe operation ... Started by armygirl	3 Replies 65 Views	Jul 24, 2018 by millet
The two broad types of fan designs are: A) Forced draft and induced draft. B) Propeller and ... Started by stephzh	1 Replies 56 Views	Jul 24, 2018 by rleezy04
What is the purpose of the door switch on a walk-in freezer? A) To energize the interior heaters ... Started by ec501234	1 Replies 32 Views	Jul 24, 2018 by Danny Ewald
How does air flow in a standing-pilot, natural-draft system? A) It relies on heat to pull air ... Started by RRMR	1 Replies 74 Views	Jul 24, 2018 by maya.nigrin17@yahoo.com
Why should the evaporator NOT be installed above the door in a walk-in cooler or freezer? A) It ... Started by drink	3 Replies 81 Views	Jul 24, 2018 by T4T
What must be considered when performing a heat load calculation for a walk-in cooler or freezer? ... Started by mcmcdaniel	1 Replies 29 Views	Jul 24, 2018 by zacnyjessica
The first step in selecting commercial refrigeration equipment for a new installation is: A) ... Started by justinmsk	1 Replies 43 Views	Jul 24, 2018 by stanleka1
Technicians should know that fan speed is directly related to the amount of air a fan can move; ... Started by dakota nelson	1 Replies 29 Views	Jul 24, 2018 by jjorrostieta
The rack-type system is the most common configuration for which type of system? A) Distributed B) ... Started by danielfitts88	3 Replies 64 Views	Jul 24, 2018 by swimkari
In order to double fan RPM, the motor horsepower: A) Will not be affected by the fan RPM. B) Must ... Started by soccerdreamer_17	1 Replies 91 Views	Jul 24, 2018 by tennis14576
What type of vent is used with 80 percent Category I furnaces? A) Type B double-wall gas vent B) ... Started by darbym82	1 Replies 55 Views	Jul 24, 2018 by kescobar@64
What speed will a fan turn if the drive motor is turning at 1,250 RPM, the motor pulley is 4 in in ... Started by serike	1 Replies 52 Views	Jul 24, 2018 by jordangronback
Filters out moisture and particulates A) subcooler ... Started by @Brianna17	3 Replies 21 Views	Jul 24, 2018 by Pamela.irrgang@yahoo.com
In series heat-reclaim systems, what happens to the heat from the refrigerant in the compressor ... Started by sdfghj	1 Replies 118 Views	Jul 24, 2018 by SomethingSomething