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2027 International Mechanical Code
Chapter 14

IMC 2027

2027 International Mechanical Code

Chapter 14Solar Thermal Systems

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Question 1 1.

A solar thermal system is being designed for domestic water heating where all solar piping is part of the potable water distribution system and all components are listed for potable water use. Under what condition are cross-connection protection measures required between the solar system piping and the potable water supply?

Only where the solar collector loop incorporates an auxiliary boiler
Whenever the collector operating temperature is capable of exceeding 140°F
Only when the system design operating pressure exceeds 80 psi
Cross-connection protection measures are not required

Question 2 2.

Solar thermal collectors and panels installed as part of a solar energy space heating system must be listed and labeled in accordance with which standard?

NFPA 70
ICC 901/SRCC 100
ICC 900/SRCC 300
ASHRAE 90.1

Question 3 3.

In a commercial building, solar thermal equipment containing pressurized fluids is installed. What is the minimum allowable working pressure rating for the system components?

Not less than the setting of the pressure relief device
Not less than 50 psi above maximum operating pressure
Not less than 150 psi regardless of system configuration
Not less than 125 percent of the system normal operating pressure

Question 4 4.

Which of the following describes the required location and isolation restriction for a relief device in a solar thermal system section subject to excessive pressures?

The relief device must be placed within 3 feet developed length of the solar collector outlet
The relief device must be located upstream of all isolation valves and service ports
The relief device must be installed so that the section cannot be valved off or isolated from it
The relief device must be positioned at the highest geometric elevation of the solar loop

Question 5 5.

A contractor is installing a solar thermal drain-back system. To ensure gravity drainage to nonfreezing areas, what minimum horizontal slope in the direction of flow must the drain-back piping and components maintain?

1/2 unit vertical in 12 units horizontal (4 percent slope)
1/8 unit vertical in 12 units horizontal (1 percent slope)
1 unit vertical in 12 units horizontal (8.3 percent slope)
1/4 unit vertical in 12 units horizontal (2 percent slope)

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