313D Load Calculation and Blueprints 5

Question 1

In residential load calculations, what climate data is used to determine outdoor design conditions?

Accepted Answer

ASHRAE Fundamentals Handbook design weather data for the local region

Answer

ASHRAE design weather data provides the 99% or 99.6% heating and 1% cooling design temperatures used for load calculations.

Question 2

What is a 'Manual D' calculation used for in residential HVAC design?

Accepted Answer

Duct system design and sizing

Answer

ACCA Manual D provides the methodology for designing and sizing residential duct systems based on airflow requirements.

Question 3

Which symbol on a blueprint typically represents a thermostat?

Accepted Answer

A circle with the letter T inside

Answer

Thermostats are commonly shown as a circle with the letter T on mechanical and electrical plans.

Question 4

What does 'EWT' stand for in HVAC load and equipment performance documentation?

Accepted Answer

Entering Water Temperature

Answer

EWT stands for Entering Water Temperature, which is the temperature of water entering a coil or heat exchanger, used in equipment performance ratings.

Question 5

On a blueprint legend, which line type typically indicates a low-voltage control wiring run for the thermostat?

Accepted Answer

Dashed or dotted line, often labeled 'LV' or 'control'

Answer

Low-voltage control wiring is usually shown as a dashed or dotted line and labeled 'LV' or 'control wiring' in the legend.

(313D) Residential Air Conditioning Systems Mechanic Certification Practice Test

(313D) Residential Air Conditioning Systems Mechanic Certification Practice Test

313D Load Calculation and Blueprints 5