Chapter 5 Water Heaters Flashcards
What is not required as part of a water heater installation?
a means to provide continous circulation
There is provision in the code for continuos circulation
What is required to be installed in the cold water line feeding a bottom feeded water heater?
Vacuum relief valve
504.2
Unless the tanks working pressure is less, What is maximum pressure settings for a T&P valve?
150PSI
504.5
What is the minimum required level working space on the control side of a water heater?
30” x 30”
502.5
The maximum temperture setting of a T & P relief valve?
210 degrees
504.5
A storage tank-type water heater is required to be installed in a pan when?
installed in an attic
504.7 amended
The drain pipe of a water heater pan shall not be less than?
3/4 “
504.7.1
The relieving capacity of a temperature relief valve shall not be less than ?
heat input of the heater
504.5
Galvanized steel drainpans for water heater must fabricated of not less than what gauge metal?
24
504.7
The maximum allowable water temperature from a tankless-type water heater intended for domestic use is?
140 degree
501.6
What is the minimum access opening for water heaters installed in attics?
20” x 30”
502.3
An electric water heater requires what safety feature that a gas water heater doen’t?
A means of disconnecting the power supply
504.3
What are the requirements for a water heater pan size?
1 1/2” deep & large enough to catch all the drippings & condensate from the heater
Temperture relief valves shall be so located in what part of the water heater?
In the top 6” of the tank
504.4.1
A water heater shall be located not more than how many feet from the attic access?
20 feet
502.3
How wide should the continuous solid flooring passageway to a water heater in an attic be?
24” wide
502.3
There are many requiremnets for the relief valve piping from a water heater. Name four.
- indirect drain connection through air gap
- not be reduced in size from the valve opening
- not connected to another relief valve drain
- discharge to the floor, outdoors or to the drain pan serving the heater
- discharge in a manner that doesn’t cause harm
- be readily observable
- not be trapped
- flow by gravity
- not terminate more than 6” above the flooror waste receptor
- no threads at the end of the piping
- no valves or tee fittings
- be constructed of appoved water pipe materials
All water heaters shall have what type of certification?
third party certification like UL
501.5
When using a shower, the hot water turns luke warm after a short period of time . The water heater is electric . What is the probable cause?
The lower element is bad.
General Knowledge
How many BTU’s does it take to raise the temperature of 40 gallons of water 10 degrees?
8.33(gallon of water weight) x 40 ( gallons of water) x 10( degrees)= 3332 BTU
One BTU is required to raise the temperture of one pound of water one degree farenheit
What specification of a water heater require it to be inspected by the State Fire Marshall?
200,000 BTU/h, 210 degree & 120 gallon tank
501.9 Amended
When a gas water heater has a bad thermocouple , what part of the gas system will not function properly.
The pilot light will not remain lite.
General Knowledge
What are the valve requirements for the water line sevring a water heater or hot water storage tank?
It shall be near the equipment , accessible & only serve the one water heater or hot water storgae tank
503.1
All Storage tank & water heaters for domestic hot water shall have what infomation clearly visible & permanently attached to the tank?
maximum allowable working pressure
501.7
You have a top feeded water heater and the hot water is only hot for a few seconds what is the probable cause?
a broken drip tube
General Knowledge
