American Water Heater 80 Thermal Efficiency UltraLow NOx Heavy Duty Commercial Gas Water Heater BCL3 User Manual

21
WATER HEATER INSTALLATION
T&P VALVE DISCHARGE PIPE
Explosion Hazard
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...

22
INSTALLATION DIAGRAMS - TOP INLET/OUTLET USAGE
Use  of  the  top  inlet  water  connection  requires  an  inlet  dip  tube 
(refer  to  figure  19).  The  tube  is  supplied  in  the  heater.  Follow 
caution  labels  if  applying  heat  to  this  fitting.  Do  not  allow  pipe 
dope to contact the plastic tube during installation.TUBE INLET INSTALLATION
FIGURE 19.  

23
HEATER WIRING
ELECTRICAL WIRING
All electrical work must be installed in accordance with the National Electrical Code, ANSI/NFPA 70 or the Canadian Electrical Code, 
CSA C22.1 and local requirements. When installed, the water heater must be electrically grounded in accordance with local codes or, 
in the absence of local codes, with the National Electrical Code, ANSI/NFPA 70 or the Canadian Electrical Code, CSA C22.1. If any 
of the original wire as supplied with the water heater must be replaced, it...

24
GAS PIPING
Contact  your  local  gas  service  company  to  ensure  that  adequate 
gas  service  is  available  and  to  review  applicable  installation  codes 
for your area.
Size the main gas line in accordance with Table 7. The figures shown 
are for straight lengths of pipe at 0.5 in. W.C. pressure drop, which is 
considered normal for low pressure systems. Note: Fittings such as 
elbows,  tees  and  line  regulators  will  add  to  the  pipe  pressure  drop. 
Also refer to the current edition...

25
PRIOR TO START UP
Installation  and  start  up  of  this  water  heater  requires  abilities 
and  skills  equivalent  to  that  of  a  licensed  tradesman  in  the  field 
involved, see Qualifications on page 6.
Do  not  place  the  water  heater  in  operation  if  any  part  has  been 
under  water.  Immediately  call  a  qualified  service  technician  to 
inspect  the  water  heater  and  to  replace  any  part  of  the  control 
system and any gas control which has been under water. 
Light  the...

26
7. If improper venting is observed during any of the above tests, 
the venting system must be corrected.
FAILURE TO CORRECT BACK DR AFTS MAY CAUSE AIR 
CONTAMINATION AND UNSAFE CONDITIONS.
•  If the back draft cannot be corrected by the normal method or 
if  a  suitable  draft  cannot  be  obtained,  a  blower  type  flue  gas 
exhauster  must  be  employed  to  ass ure  proper  venting  and 
correct combustion.
CHECKING THE INPUT
Follow these instructions to determine the firing rate of the water...

27
8. If  the  Ignition  Control  does  not  sense  the  pilot  flame  during  the 
ignition trial period, the Ignition Control shuts the Pilot Gas Valve 
and turns off the Spark Igniter. After 5 minute delay, a new trial for 
ignition  is  initiated. This  sequence  continues  until  the  unit  lights 
or “Call for Heat” is removed.
9.  If  the  pilot  flame  is  proved  during  the  ignition  trial  period,  the 
Ignition  Control  will  energize  the  main  gas  control  valve  to  start 
the  heating...

28
SEQUENCE OF OPERATION FLOW CHART
Description of this flow chart can be found in the “SEQUENCE OF OPERATION” section found on page 27.
Thermostat calls f\uor heat
Switch power on to\u unit
\flower engages Prove\ur Switc h
\bgnition Control mo\unitors  
flame signal
Loss of flame sign\ual ?
YE
S
YES
NO NO
\flower power 
relay is energ ized to 
st art blower
\bgnion Contr ol provides power to Spa\urk  
\bgnite r and Pilot Gas V alve and monitor s 
Flame Sensor to de\ut ermine if \furner is\u lit
24V
AC...

29
VENTING SYSTEM
Examine  the  venting  system  every  six  months  for  obstructions 
and/or  deterioration  of  the  vent  piping.  Check  all  vent  system 
connections for leakage and repair or reseal as necessary.
Remove  all  soot  or  other  obstructions  from  chimney  which  will 
retard free draft.
INTAKE AIR SCREEN
The intake air screen is attached to the inlet end of the combustion 
blower. Inspect the intake air screen every six months. The intake air 
screen should be cleaned of any...

30
DRAINING AND FLUSHING
Burn harzard.
Hot water discharge.Keep  hands   clear  of  drain
valve  discharge.
It is recommended that the water heater storage tank be drained 
and  flushed  every  6  months  to  reduce  sediment  buildup.  The 
water heater should be drained if being shut down during freezing 
temperatures.
To Drain the Water Heater Storage Tank:
1.  Turn off the electrical supply to the water heater.
2.  Turn off the gas supply at the Main Gas Shutoff Valve if 
the  water  heater  is...