American Water Heater BCL3 85T390 6NOX ユーザーズマニュアル

20

Temperature-Pressure Relief Valve

must comply with ANSI Z21.22-

CSA 4.4 and ASME code.

Properly sized temperature-

pressure relief valve must be

installed in opening provided.

Can result in overheating and

excessive tank pressure.

Can cause serious injury or death.

This  water  heater  is  provided  with  a  properly  rated/sized  and 

certified combination temperature - pressure (T&P) relief valve by 

the manufacturer. See Temperature-Pressure relief Valve on pages 

13-14 for information on replacement and other requirements.

Temperature-Pressure Relief Valve discharge

pipe must terminate at adequate drain.

Install a discharge pipe between the T&P valve discharge opening 

and  a  suitable  floor  drain.  Do  not  connect  discharge  piping 

directly to the drain unless a 6” (15.2 cm) air gap is provided. 

To prevent bodily injury, hazard to life, or property damage, the 

relief  valve  must  be  allowed  to  discharge  water  in  adequate 

quantities should circumstances demand. If the discharge pipe is 

not connected to a drain or other suitable means, the water flow 

may cause property damage.
t&p Valve discharge pipe requirements:

•  Shall not be smaller in size than the outlet pipe size of the 

valve, or have any reducing couplings or other restrictions.

•  Shall not be plugged or blocked.
•  Shall not be exposed to freezing temperatures.
•  Shall be of material listed for hot water distribution.
•  Shall be installed so as to allow complete drainage of both 

the Temperature-Pressure relief Valve and the discharge 

pipe.

•  Must terminate a maximum of six inches above a floor 

drain or external to the building. In cold climates, it is 

recommended that the discharge pipe be terminated at an 

adequate drain inside the building.

•  Shall not have any valve or other obstruction between the 

relief valve and the drain.

The water piping installation must conform to these instructions 

and to all local code authority having jurisdiction. Good practice 

requires that all heavy piping be supported.
read  and  observe  all  requirements  in  the  following  sections 

before installation of the water piping begins:
1.  Water Temperature Control and Mixing Valves on page 12.
2.  Dishwashing Machines on page 13.
3.  Temperature-Pressure relief Valve on page 13.
4.  Closed Systems and Thermal expansion on page 13.
5.  For  multiple  water  heater  installations  see  Water  Piping 

Diagrams beginning on page 34.

1.  All  piping  components  connected  to  this  unit  for  space 

heating applications shall be suitable for use with potable 

water.

2.  Toxic chemicals, such as those used for boiler treatment, 

shall neVer be introduced into this system.

3.  This unit may neVer be connected to any existing heating 

system or component(s) previously used with a non-potable 

water heating appliance.

4.  When  the  system  requires  water  for  space  heating  at 

temperatures  higher  than  required  for  domestic  water 

purposes,  a  tempering  valve  must  be  installed.    Please 

refer to installation diagrams beginning on page 34 of this 

manual for suggested piping arrangements.

5.  These  water  heaters  cannot  be  used  in  space  heating 

applications only

Thermometers should be obtained and field installed as shown 

in the installation diagrams.
Thermometers  are  installed  in  the  system  as  a  means  of 

detecting the temperature of the outlet water supply.

This manual provides detailed water piping diagrams for typical 

methods of application for the water heaters, see Water Piping 

Diagrams beginning on page 34.
The water heater may be installed by itself, or with a separate 

storage  tank.  When  used  with  a  separate  storage  tank,  the 

circulation may be either by gravity or by means of circulating 

pump. Adjust flow by throttling a full port ball valve installed in the 

circulating line on the outlet side of the pump. never throttle flow 

on the suction side of a pump. See the Water Piping Diagrams 

beginning on page 34.
note: In addition to the factory installed Temperature-Pressure 

relief  Valve  (T&P  valve)  on  the  water  heater,  each  remote 

storage tank that may be installed and piped to a water heating 

appliance  must  also  have  its  own  properly  sized,  rated  and 

approved Temperature-Pressure relief Valve installed. 
Call the toll free technical support phone number listed on the 

back cover of this manual for further assistance in sizing a T&P 

valve for remote storage tanks.