Chapter 4
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| Hot water is water to which heat ? | Heat energy has been added
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| Domestic Hot water Temp should be between? | 105F and 140 F
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| When water is heated it? | Expands and volume decrease?
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| Temperature and pressure relief valve | A dual type safety valve
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| As water is heated it immediately starts to____ | expand
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| A thermal expansion tank features a _____ air cushion ___ to the minimum system pressure before recovery starts | sealed, precharged
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| The volume of hot water supply is governed by recovery rate of hot water heater | True
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| Specific heat is the amount of of heat required to raise temperature of 1lb of a substance____ | 1F
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| The definition of specific heat indicates you must know the _______ of the water to be heated. | weight
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| Water can be heated using _____ and ___ | Direct and Indirect
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| whats Four direct methods for heating domestic hot water? | Gas,, Oil, Electricity, Instantaneous
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| Point of use heaters are small fixture____ type water heaters | under storage
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| Heat is a form of_____ that produces work or motion | Energy
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| What s convection associated with? | Liquid and Vapors
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| Water weight is 8.33LB | True
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| Gas fired heaters have____ burners forced draft burners_____ burners | atmospheric and condensing
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| Heating elements in electric water heaters are available in variety of____ and ___ | Voltages and Wattages
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| What is most common lining applied to interior of water heater tanks made out of? | Glass
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| Magnesium ___ are used used to protect the interior surfaces of a steel tank | Anode
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| Domestic Hot Water supply systems can be best classified by the type of service they perform, that is one temperature and____ multiple | multiple
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| Forced____ requires the use of a circulating or booster pump | circulation
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| What are check valves? | They are used to prevent backflow and back pressure in hot water supply
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| Expansion of water in a hot water supply system also causes the pipe which carries the water to expand as as heat is _______ | Transferred
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| Mechanical_______ joints or _____ joints can be used to absorb expansion in a hot water supply. | Expansion joints or Swing joints
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| Food service applications are most common examples of_____ temperature hot water supply systems. | multiple
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| Whats the minimum temperature needed for commercial dishwater sanitizing rinse is | 180F
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| What are the major parts of hot water supply system? | Mains, Risers, Major Branch, Minor Branch, Circulating Lines, Terminal Points
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| One temperature systems are often called______ | Recovery systems
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| Food service applications are most common examples of_____ temperature hot water supply systems. | multiple
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| Gravity circulation is more important than forced circulation? | False
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| A____ control valve is used in a hydronic heating system to prevent circulation of hot water when hot boiler water is not need. | Flow
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| The horziontal pipe between an ATFL fitting must pitch up at least ______ | 1"
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| What must be used if a dip tube cant be used | in line air seperator
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| Centrifugal pumps can be install where? | supply and return piping
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| How is a electronic zone valve operated? | It is electronically operated
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| A closed hot water heating system holds a solid fill of water in the? | a) expansion tank
b)boiler,piping, radiation
c)flow valve
D)circulating pump
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| All piping in a hot water system must be ____ so that air in system can be____ into the expansion tank or from manual air vents | pitch, vented
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| Which fittings should be used when changing size of horizontal runs of pipe | eccentric fittings
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| A draft hood must be attached directly to a gas | fire water heater
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| An immersion type aquastat device does what? | Sense the temperature of water being heated
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| The basic deigns of water heaters are intended for use with? | Internal Immersion and External Immersion
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| How can the affects of hard water in domestic hot water heating equipment be minimized? | Lower water temperature and controlling flow
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| What are 6 valves in hot water system? | Check, ball,globe,butterfly,balance
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| What two valves are isolation valves? | Balls valves and gate valves
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| What is a heat exchanger? |
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| Water at ____ can scald in just half a second | 150F
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| ___ valve is used for throttling and shut off purpose | Globe valve
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| Balance valves are used for what? | To balance or equalize circulation
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| What are butterfly valves used for? | Balancing valves and isolate section of piping system
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| Pressure relief valve are set to relief system if pressure exceeds____ | 30 PSIG
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