Copyright Goodheart-Willcox Co., Inc. 268 Hydronic Heating: Systems and Applications Know and Understand 1. With radiant heating, _____. A. heat is conveyed in a direct physical path B. objects are heated, rather than the air C. Both A and B are correct. D. Neither A nor B are correct. 2. The hot water supply temperature range used with radiant heating is usually between _____. A. 50°F–100°F B. 100°F–140°F C. 140°F–180°F D. 180°F–200°F 3. A heating system that has a very limited capacity to store heat energy is known as a _____. A. low-mass heating system B. high-mass heating system C. equal mass heating system D. radiant heating system 4. Which type of radiant tubing can be heated and returned back to its original shape if it becomes kinked? A. PEX type A B. PEX type B C. PEX type C D. None of the above. 5. True or False? If PEX tubing has to come in contact with any fittings or devices that contain ferrous materials, then an oxygen barrier is required. 6. PE-RT tubing is constructed with _____ layers of material that give it significant strength and chemical resistance. A. three B. four C. five D. seven 7. When installing a slab-on-grade radiant system, as much as _____ of the heat generated by the boiler can be lost through the Earth if the concrete slab is not properly insulated. A. 40% B. 50% C. 60% D. 70% 8. Radiant floor systems should be pressure tested with up to _____ times the normal operating pressure and for a minimum of _____ hours. A. 2, 12 B. 3, 24 C. 4, 48 D. 5, 72 9. Typically, a poured gypsum floor will add _____ pounds per square foot to the dead load of an existing floor structure. A. 5 to 10 B. 13 to 15 C. 15 to 20 D. 20 to 23 10. One type of radiant floor heating that can be used when the existing floor cannot support the additional weight of a conventional installation is known as _____. A. slab on grade B. thin-slab flooring C. above-floor prefabricated panels D. slab on slab 11. Radiant wall and ceiling panels are considered _____. A. high-mass systems B. low-mass systems C. equal mass systems D. standard mass systems 12. True or False? Smaller radiant tubing will result in a lower head loss than larger tubing but will provide nearly twice the fluid flow. 13. True or False? Decreasing the radiant tubing spacing will lower the required supply water temperature and produce a more even surface temperature, but it increases the amount of tubing required. 14. What is an advantage of using a modulating zone valve compared to a two-position valve? A. Modulating zone valves provide optimal heating control. B. Modulating zone valves decrease the chance of water hammer. C. Both A and B are correct. D. None of the above. 15. What device is used to detect snow and ice buildup on outdoor surfaces when using a snow melt system? A. An in-ground sensor B. An outdoor air sensor C. A tubing temperature sensor D. A microprocessor sensor