Hydroic heating

Question 1

which of the controls listed below, controls the gas pressure to the main burner, the temperature of the water, and turns off the gas when the pilot goes out.

a) ECO
b) temperature and pressure relief valve
c) aquastat
d) unitrol

Answer 1

d) unitrol

Question 2

the components of a copper fin tube, instantaneous water heater are :

a) anti-scald device and a pump control
b) pump, pump control, flow switch temperature and pressure relief valve, and a limit control.
c) ECO temperature and pressure relief valve anonde, and a dip tube
d) temperature and pressure relief valve anode and a limit control

Answer 2

b) pump, pump control, flow switch temperature and pressure relief valve, and a limit control.

Question 3

what does ECO Stand for

Answer 3

Energy control shut off device

Question 4

the minimum allaowable distance to be maintained from a 50,000 btuh water heater outlet to a gas utility service regulator vent opening is

a) 1’ (300mm)
b) 2’ (600mm)
c) 3’ (900mm)
d) 6’ (1800 mm)

Answer 4

c) 3’ (900mm)

Question 5

the minimum allowable distance to be to be maintained from a 50,000 btuh water heater flue outlet to a building opening is

a) 6” (150mm)
b) 12” (300mm
c) 2’ (6)00mm)
d) 3’ (900mm)

Answer 5

b) 12” (300mm)

Question 6

the minimum allowable distance to be maintained from a 50,000 Btuh water heater flue outlet to a building opening is

a) 6” (150mm)
b) 12” (300mm
c) 2’ (6)00mm)
d) 3’ (900mm)

Answer 6

b) 12” (300mm)

Question 7

what must be done to ensure equal water flow through two water heaters when they are paired together

a) install flow balancing cocks
b) ensure they are installed on the same vertical plane
c) ensure the inlet and outlet piping are equivalent lengths
d) install a mixing valve and two water regulators

Answer 7

c) ensure the inlet and outlet piping are equivalent lengths

Question 8

What will cause a E.C.O to Open

a) a defective thermostat
b) long draws of water
c) a dip tube which is to short
d) too low of thermostat settings

Answer 8

a) a defective thermostat

Question 9

Which of the following is used to de-lime a water heater

a) backing soda
b) tri-sodium phosphate
c) lemon juice
d) muriatic acid

Answer 9

d) muriatic acid

Question 10

the most likely cause of a puddle of water at the side of a water heater where the drain cock and relief valve are located is that

a) the drain cock is opening intermittently
b) the relief valve is opening periodically
c) it is caused by condensation created when cold water enters the heater
d) the unitrol fitting is leaking and self re-sealing itself

Answer 10

b) the relief valve is opening periodically

Question 11

a customer complains that the pilot goes out every once and a while. this is the second service call for this problem this month when the pilot is re-established, the closed circuit millivolt test stays at 14 millivolts. the magnet drops out at 4 millivolts what should be done next?

a) replace the gas valve because the magnet is weak
b) clean and adjust the pilot and burners
c) replace the thermocouple
d) check for another problem such as down draft or pilot position

Answer 11

d) check for another problem such as down draft or pilot position

Question 12

what is the pressure relief valve setting for most residential type water heaters

a) 75 psig
b) 100 psig
c) 150 Psig
d) 200 Psig

Answer 12

c) 150 Psig

Question 13

the device that water heaters use to direct the incoming water to the lower part of the tank is called

a) an anode
b) an anti-siphon device
c) a cathode
d) a dip tube

Answer 13

d) a dip tube

Question 14

is it permitted to use water heaters for space heating only

a) yes
b) no

Answer 14

b) no

Question 15

is leaded solder allowed on the heating portion of a combination domestic heating / hot water system

a) yes
b) no

Answer 15

b) no

Question 16

the recommended water temperature setting from a mixing valve to the domestic water system in combination heating systems that enjoy oil-fired water heaters for heating potable water and for space heating

a) 43 C (110 F)
b) 49 C to 54 C (120 F to 130 F)
c) 60 C to 66C ( 140 F to 150 F)
d) 83 C (180F)

Answer 16

b) 49 C to 54 C (120 F to 130 F)

Question 17

head pressure in a piping system for water heating is

a) the maximum pressure created by a particular model of pump
b) the minimum pressure created by a particular model of pump
c) the resistance of the entire piping system measured in feet of water.
d) the resistance of the entire piping system measured in PSI

Answer 17

c) the resistance of the entire piping system measured in feet of water.

Question 18

from the following list which is the best location for a combination heating system consisting of a water heater and an air handler

a) in the insulated but unheated attached garage
b) the water heater in the basement and the air handler in a central location
c) together in a central location in the basement
d) the air handler supported on top of a rear flue water heater in a closet space

Answer 18

c) together in a central location in the basement

Question 19

which of the following components used in a combination heating system employing a water heater may be required when a backflow prevention valve is installed in the cold water supply

a) mixing valve
b) balancing valve
c) check valve
d) expansion tank

Answer 19

d) expansion tank

Question 20

the purpose of a mixing valve on a combination system employing a water heater to provide hot water for potable use and provide space heating is to

a) mix hot water with cold water in the heating loop
b) mix cold water with the hot water supply to the domestic plumbing system to maintain a consistent temperature of domestic hot water
c) mix cold water with the hot water supply to the heating loop to maintain a consistent temperature of water in the loop
d) return some of the water to the tank so that it does not run out of water

Answer 20

b) mix cold water with the hot water supply to the domestic plumbing system to maintain a consistent temperature of domestic hot water

Question 21

before lighting a burner in a steam boiler, ensure that

a) there is water in the boiler
b) the temperature controller is set properly
c) the main burner test firing valve is turned on
d) the safety valves are open

Answer 21

a) there is water in the boiler

Question 22

What safety control protects a steam boiler if the condensate pump fails to return water to the boiler

a) high pressure limit control
b) low pressure limit control
c) flame safeguard control
d) low water cut off

Answer 22

d) low water cut off

Question 23

a low water cut off is required on a steam boiler not under continuous attendance by a certified operator, when the rated input is

a) 30,000 btuh
b) 100,000 btuh
c) 400,000 btuh
d) any value

Answer 23

d) any value

Question 24

if it has been determined that a steam boiler burner is on and the water gauge glass indicates no water, what should be done immediately?

a) shut off the fuel supply
b) open the water supply
c) notify the building owner
d) adjust the high pressure limit control

Answer 24

a) shut off the fuel supply

Question 25

a low water cut off device on an automatically fired hot water heating boiler rated at 350,000 btuh

a) not required if a limit control is installed
b) not required if it is installed in an industrial application
c) required when any portion of the circulating system is located below the boiler
d) required only in commercial applications

Answer 25

c) required when any portion of the circulating system is located below the boiler

Question 26

expansion tanks provide a place for;
a) water to cool before returning to the system and pressure to build so the system so the system will operate properly
b) hot water to expand so it will be forced through the system and for the steam to be trapped
c ) expanded water to travel to and allow for pressure fluctuations in the systems
d) condensate to collect before it returns to the boiler and a place for steam to expand in the system

Answer 26

a) water to cool before returning to the system and pressure to build so the system so the system will operate properly

Question 27

the maximum operating pressure of a low pressure steam boiler is

a) 5 psig
b) 15 psig
c) 100 psig
d) 150 psig

Answer 27

b) 15 psig

Question 28

condensate in a boiler heating system is ;

a) water heated for use in residential equipment
b) water in a hot water boiler return line
c) water from the relief valve in a boiler
d) water in a steam boiler return line

Answer 28

d) water in a steam boiler return line

Question 29

a fire tube boiler has

a) water outside the tubes and flue gases outside
b) water inside the tubes and flue gases outside
c) water inside the tubes and water outside
d) water outside the tubes and flue gases inside

Answer 29

d) water outside the tubes and flue gases inside

Question 30

Aquastats respond to changes in

a) flue gas temperature
b) water temperature
c) stack temperature
d) air temperature

Answer 30

b) water temperature

Question 31

a back flow preventer in a hydronic heating system is used to

a) keep the hot water from entering the cold water system
b) hold the pressure on the system during a temporary shut down to prevent the entry of air
c) prevent the heating water from circulating the wrong way in the system
d) keep no-potable water from entering the drinking water system

Answer 31

d) keep no-potable water from entering the drinking water system

Question 32

if the thermostat heat anticipator is set too low of a setting.

a) the space temperature will be to high
b) the space temperature will be too low
c) the burnerwill run until the desired temperature is achived
d) the circulating pump will run continuously

Answer 32

b) the space temperature will be too low

Question 33

the most important valve in a hot water system is a

a) gate valve
b) globe valve
c) blow down valve
d) relief valve

Answer 33

d) relief valve

Question 34

a pressure reducing valve :

a) relieves system pressure in excess of the set pressure
b) reduces the city main pressure to a safe working pressure
c) reduces the working pressure to the city main pressure
d) prevents hot water gravity circulation

Answer 34

b) reduces the city main pressure to a safe working pressure

Question 35

the relief valve for a low pressure hot water system should be set at

a) 14.7 Psia
b) 15 psig
c) 30 psia
d) 30 psig

Answer 35

d) 30 psig

Question 36

a back flow preventer used in a boiler system should be located in the :

a) overflow line connected to the drain
b) return line close to the boiler
c) 3/4” line connecting the boiler and cushion tank
d) make up water line to the system

Answer 36

d) make up water line to the system

Question 37

scenario ; there is a storage type of system. the boiler is hot, the circulating pump motor is running and the thermostat is calling for heat and the upstairs is cold. the most likely problem is:

a) a faulty limit control
b) a faulty operator
c) an open relief valve
d) a broken pump coupling

Answer 37

d) a broken pump coupling

Question 38

If the bypass valve on a pool heater is closed:

a) the burner will not operate
b) the heater will have shorter “on” cycles
c) the pool water temperature will be too low
d) the flue gases may condense

Answer 38

d) the flue gases may condense

Question 39

on seasonal start up a pool heater should run:

a) intermittently
b) continuously for 24 hours
c) continuously until the thermostat is satisfied
d) one hour on and one hour off until the thermostat is satisfied.

Answer 39

c) continuously until the thermostat is satisfied

Question 40

why is a pressure relief valve is installed on a pool heater system

a) to maintain the pool water level
b) to prevent over pressurizing the filter
c) to prevent damage to the system
d) to relieve excess water pressure caused by solar gain.

Answer 40

c) to prevent damage to the system