American Water Heater VG6250T76NV Series 100 User Manual

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This water heater should not be connected to any heating systems or 

component(s) used with a non-potable water heating appliance.

All  piping  components  connected  to  this  unit  for  space  heating 

applications should be suitable for use with potable water.

Toxic chemicals, such as those used for boiler treatment should not 

be introduced into this system.
When the system requires water for space heating at temperatures 

higher  than  required  for  domestic  water  purposes,  a  mixing 

valve  must  be  installed.  Please  refer  to  Figure  2  for  suggested  

piping arrangement.

This  appliance  has  been  design  certified  as  complying  with

American  National  Standard/CSA  Standard  for  water  heaters  

and  is  considered  suitable  for  Water  (Potable)  Heating  and  

Space Heating.
Your  water  heater  is  equipped  with  inlet/outlet  connections 

for  use  in  space  heating  applications  (see  Figure  2).  If  this

water heater is to be used to supply both space heating and 

potable  (drinking)  water,  the  instructions  listed  below  must

be followed:
•  Be sure to follow the manual(s) shipped with the air handler or other

type heating system.

•  This water heater is not to be used as a replacement for an existing

boiler installation.

•  Do not use with piping that has been treated with chromates, boiler

seal or other chemicals and do not add any chemicals to the water 

heater piping

•  If the space heating system requires water temperatures in excess of

120°F (49°C), a mixing valve must be installed per the manufacturer’s

instructions in the potable hot water supply to limit the risk of scald 

injury.

•  Pumps, valves, piping and fi ttings must be compatible with potable

water.

•  A  properly  installed  flow  control  valve  is  required  to  prevent

thermosiphoning. Thermosiphoning  is  the  result  of  a  continuous 

flow  of  water  through  the  air  handler  circuit  during  the  off  cycle.

Weeping  (blow  off)  of  the  temperature  and  pressure  relief  valve  

(T & P) or higher than normal water temperatures are the first signs

of thermosiphoning.

•  The  hot  water  line  from  the  water  heater  should  be  vertical  past

any mixing valve or supply line to the heating system to remove air 

bubbles from the system.

•  Do  not  connect  the  water  heater  to  any  system  or  components

previously used with non-potable water heating appliances when 

used to supply potable water.

Water supply systems may, because of code requirements or such 

conditions  as  high  line  pressure,  among  others,  have  installed 

devices such as pressure reducing valves, check valves, and back 

flow preventers. Devices such as these cause the water system to

be a closed system.

CORROSION  OF  THE  FLUEWAYS  AND  VENT  SYSTEM  MAY 

OCCUR IF AIR FOR COMBUSTION CONTAINS CERTAIN CHEMICAL 

VAPORS.  SUCH  CORROSION  MAY  RESULT  IN  FAILURE  AND 

RISK  OF  ASPHYXIATION.
Spray  can  propellants,  cleaning  solvents,  refrigerator  and  air 

conditioning  refrigerants,  swimming  pool  chemicals,  calcium  and 

sodium chloride (water softener salt), waxes, and process chemicals

are typical compounds which are potentially corrosive.
Do not store products of this sort near the heater. Also, air which is 

brought  in  contact  with  the  heater  should  not  contain  any  of  these 

chemicals. If necessary, uncontaminated air should be obtained from 

remote or outside sources. The limited warranty is voided when failure 

of water heater is due to a corrosive atmosphere. (See limited warranty

for complete terms and conditions).

Water temperature over 125°F (52°C)

can cause severe burns instantly

resulting in severe injury or death.
Children, the elderly and the physically 

or mentally disabled are at highest 

risk for scald injury.
Feel water before bathing or showering.
Temperature limiting valves are 

available.
Read instruction manual for safe

temperature setting.

HOTTER  WATER  CAN  SCALD: 

Water  heaters  are  intended  to  produce  hot  water.  Water  heated  to 

a  temperature  which  will  satisfy  space  heating,  clothes  washing, 

dish  washing,  cleaning  and  other  sanitizing  needs  can  scald  and 

permanently injure you upon contact. Some people are more likely 

to  be  permanently  injured  by  hot  water  than  others. These  include 

the elderly, children, the infirm, or physically/mentally handicapped.

If anyone using hot water fits into one of these groups or if there is

a local code or state law requiring a certain temperature water at the 

hot water tap, then you must take special precautions. In addition to 

using lowest possible temperature setting that satisfies your hot water

needs, a means such as a mixing valve, should be used at hot water 

taps used by these people or at the water heater, see Figure 2. Valves 

for reducing point of use temperature by mixing cold and hot water are 

also available:

 

Consult a Qualified Installer or Service Agency. Follow manufacturer’s

instructions for installation of valves. Before changing the factory setting 

on thermostat, read “Temperature Regulation” section in this manual.