American Water Heater Heavy Duty Commercial Gas BCG3 User Manual

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INSULATION BLANKET
Do not obstruct water heater air intake
with insulating blanket.
Gas and carbon monoxide detectors
are available.
Install water heater in accordance with
the instruction manual.
Breathing carbon monoxide can cause brain damage or
death. Always read and understand instruction manual.
Breathing Hazard - Carbon Monoxide Ga s
Insulation blankets are available to the general public for external 
use  on  gas  water  heaters  but  are  not  necessary  with  these 
products.  The  purpose...

12
Breathing Hazard - Carbon Monoxide Gas
Breathing carbon  monoxide can cause brain  damage or
death.  Always read and understand  instruction  manual. Under no circumstances should
the input exceed the rate shown
on the water heater
’s rating label.  
Overfiring could result in damage to
the water heater and sooting.
Gas and carbon monoxide detectors
are available.
Installations  above  2000  feet  (610  meters)  require 
replacement  of  burner  orifices  in  accordance  with  current 
edition  of...

13
4. When  installing  multiple  water  heaters  in  the  same  gas  supply  
  system  it  is  recommended  that  individual  positive  lock-up  gas  
  pressure regulators be installed at each unit.
POWER SUPPLY
The  water  heaters  covered  in  this  manual  require  a  120  VAC, 
1Ø  (single  phase),  60Hz,  15  amp  power  supply  and  must  also 
be  electrically  grounded  in  accordance  with  local  codes  or,  in  the 
absence  of  local  codes,  with  the  National  Electrical  Code,  ANSI/...

14
HOT WATER
OUTLET
TO TA NK
INLET
CHECK
VA LVE MIXING
VA LVE
COLD
WA TER
INLET TEMPERED WA
TER
OUTLET
12”  TO 15”
(30-38 cm)
CHECK VA LVE
FIGURE 10.
DISHWASHING MACHINES
All  dishwashing  machines  meeting  the  National  Sanitation 
Foundation requirements are designed to operate with water flow 
pressures  between  15  and  25  pounds  per  square  inch  (103  kPa 
and  173  kPa).  Flow  pressures  above  25  pounds  per  square  inch 
(173  kPa),  or  below  15  pounds  per  square  inch  (103  kPa),...

15
No  valve  or  other  obstruction  is  to  be  placed  between  the 
Temperature-Pressure Relief Valve and the tank. 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...

16
DIRECT VENT APPLIANCES
Appliances installed in a Direct Vent configuration that derive all 
air for combustion from the outdoor atmosphere through sealed 
intake air piping are not factored in the total appliance input Btu/
hr calculations used to determine the size of openings providing 
fresh air into confined spaces.
EXHAUST FANS
Where exhaust fans are installed, additional air shall be provided 
to  replace  the  exhausted  air.  When  an  exhaust  fan  is  installed 
in  the  same  space  with  a...

17
MULTIPLE HEATER MANIFOLD
Figure  13  and  tables  on  pages  19  and  20  should  be  used  for 
horizontally manifolding two or more heaters.
FIGURE 13.
FRESH AIR OPENINGS FOR CONFINED SPACES
The  following  instructions  shall  be  used  to  calculate  the  size, 
number  and  placement  of  openings  providing  fresh  air  for 
combustion,  ventilation  and  dilution  in  confined  spaces.  The 
illustrations shown in this section of the manual are a reference 
for  the  openings  that  provide...

18
When ducts are used, they shall be of the same cross sectional 
area  as  the  free  area  of  the  openings  to  which  they  connect. 
The minimum dimension of rectangular air ducts shall be not less 
than 3 inches.
AIR FROM OTHER INDOOR SPACES
FIGURE 18.
The  confined  space  shall  be  provided  with  two  permanent 
openings, one commencing within 12 inches (300 mm) of the top 
and one commencing within 12 inches (300 mm) of the bottom of 
the enclosure. See Figure 18.
Each  opening  shall...

19
TYPE B GAS VENT
Multiple Gas Fired Tank-Type Heaters
When venting multiple tank type heaters using Type B vent pipe, 
follow  the  installation  diagram  (Figure  13)  and  tables  below 
which give sizing and data based upon NFPA 54/ANSI Z223.  
TABLE 6. TECHNICAL DATA VENTING
MODEL (A)BCG370T120
Input: 120,000 Btuh                                                     \
                                         Total Vent Height (Feet)Draft Hood: 5” 6810 15203050100
Input Btuh Rise Vent Connector...

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