American Water Heater Heavy Duty Commercial Gas BCG3 User Manual

							21
grounding shall be done in accordance with the current edition 
of the Canadian Electrical Code CSA C22.1 and/or local codes.
VENT INSTALLATION
Seal  all  joints  between  the  power  venter  and  the  vent 
termination.  This  is  to  prevent  leakage  of  exhaust  products 
into the room(s) due to positive pressure of blower.
The “Sequence of Operation” description will be the same with 
mechanical venting except;
When the water heater thermostat calls for heat:
Thermostat  contacts  “Close”  and  the  power  venter  blower 
(120 VAC) is energized. Sufficient draft must be established 
for  the  “Draft  Prover  Switch  (N.O.)”  to  “Close”.  When  the 
draft prover switch “Closes” the relay coil of the flue damper  
is energized.
WATER HEATER INSTALLATION
MECHANICAL VENTING
SINGLE UNIT INSTALLATION
When  mechanical  venting  of  these  heaters  is  desired,  the 
following kits are available.
Models with inputs from 120,000 to 200,000 btu/h
part number 9005381205
Models with inputs from 250,000 to 390,000 btu/h
part number 9003434205
Where an approved power venter is to be installed to operate 
in conjunction with the water heater thermostat, the following 
codes  must  be  adhered  to.  Field  wiring  should  conform  to 
the  current  edition  of  the  National  Electrical  Code  NFPA  70. 
For  Canadian  installations  the  electrical  connections  and 
WATER PIPING DIAGRAMS
This manual provides detailed water piping diagrams for typical 
methods  of  application  for  the  water  heaters,  see  Water  Piping 
Diagrams beginning on page 40.
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 40.
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.
T&P VALVE DISCHARGE PIPE
Explosion Hazard
Te mperature-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.
WATER LINE CONNECTIONS
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 13.
2.  Dishwashing Machines on page 14.
3.  Temperature-Pressure Relief Valve on page 14-15.
4.   Closed Systems and Thermal Expansion on page 14.
5.  For  multiple  water  heater  installations  see  Water  Piping 
Diagrams beginning on page 40.
WATER (POTABLE) HEATING AND SPACE HEATING
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  40  of  this 
manual for suggested piping arrangements.
5.  These  water  heaters  cannot  be  used  in  space  heating 
applications only
THERMOMETERS (NOT SUPPLIED)
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.  
						

							22
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 
14-15 for information on replacement and other requirements.
Water Damage Hazard
Temperature-Pressure Relief V alve discharge
pipe must terminate at adequate drain.
CAUTION
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 
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.
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
All electrical work must be installed in accordance with the current edition of the National Electrical Code ANSI/NFPA No. 70 or Canadian Electrical 
Code CSA C22.1 and must conform to all local code authority having jurisdiction.  AN ELECTRICAL GROUND IS REQUIRED TO REDUCE RISK OF 
ELECTRICAL SHOCK OR POSSIBLE ELECTROCUTION.
If any of the original wire as supplied with the water heater must be replaced, use only type 105°C thermoplastic or equivalent 250
0C type F must be 
used for the flame sensor and igniter leads.
The controls of this water heater are polarity sensitive. Be certain to properly wire the hot and neutral connections.
13
42
C
P
M
X
MV
MV/PV
PV
24 V GND
24 V 
SP ARKER
GND-BURNE
R
HONEYWELL  IGNITION
DAMPER
DRIVE
ON/OFF
SWITCH
LOWER
PROBE
UPPER
PROBE/ECO 11
E79
LINE
IN
1 2
3
4
NEUTRAL
GND
NA
TURAL
GAS
VA LVE
PV
PV
THTR
MV MV/PV
MV
PROP ANE
GAS
VA LVE
120 vac
24 VA C TO  IGNITION CONTRO L
DAMPER
DRIVE
24 VAC
24 NEUTRA
L
FACT OR Y WIRED
BY  INST ALLER
IF ANY  OF THE ORIGINAL  WIRE AS SUPPLIED MUST  BE REPLACED, USE ONL Y TYPE 105O C
THERMOPLASTIC OR EQUI VALENT . FLAME SENSOR IGNITION CABLE MUST  BE 250O C TYPE F.
330548-000 REV 00
W
W W
Y
BLK
BLKBLK
W
R
R
Y
BLK
BL
W
LEGEND:
W --WHITE
BLK--BLACK
BL--BLUE
R--RED
Y --YELLOW
FIGURE 20.  
						

							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 latest version of the National Fuel Gas Code.
Schedule  40  Steel  or  Wrought  Iron  Pipe  is  the  preferred  material 
for  the  gas  line  of  this  water  heater.  It  is  imperative  to  follow  the 
sizing  recommendations  in  the  latest  version  of  the  National  Fuel 
Gas  Code  if  Corrugated  Stainless  Steel  Tubing  (CSST)  is  used  as 
the gas line for this water heater.
The  heater  is  not  intended  for  operation  at  higher  than  14.0"  W.C.- 
natural gas, (1/2 pound per square inch gage) supply gas pressure. 
Exposure  to  higher  supply  pressure  may  cause  damage  to  the 
gas  valve  which  could  result  in  fire  or  explosion.  If  overpressure 
has  occurred  such  as  through  improper  testing  of  gas  lines  or 
emergency malfunction of the supply system, the gas valve must be 
checked for safe operation. Make sure that the outside vents on the 
supply  regulators  and  the  safety  vent  valves  are  protected  against 
blockage. These are parts of the gas supply system, not the heater. 
Vent blockage may occur during ice storms.TABLE 7.  GAS SUPPLY PIPE LENGTHS (IN FEET)
Maximum Equivalent Pipe Length - Natural Gas Only
Input rate 
(BTU/HR) Schedule 40 Steel or Wrought Iron Pipe
1/2" 3/4" 1"1 1/4" 1 1/2"
120,000 2070200 200200
154,000 1040150 200200
180,000 -30 100 200200
199,000 -30 90200 200
250,000 -20 60200 200
275,000 -10 50200 200
310,000 -10 40150 200
366,000 --30 100 200
390,000 --20 100 200
Fitting Type* Equivalent length in feet
45°Ell 0.71.01.21.61.9
90°Ell 1.62.12.63.54.0
Te e 3.14.15.26.98.0
Natural Gas 0.60 Specific Gravity, 0.50" W.C. Pressure Drop
*Screwed Fittings
It  is  important  to  guard  against  gas  valve  fouling  from  contaminants  in 
gas ways. Such fouling may cause improper operation, fire or explosion.
If  copper  supply  lines  are  used  they  must  be  internally  tinned  and 
certified  for  gas  service.  Before  attaching  the  gas  line,  be  sure  that 
all gas pipe is clean on the inside.
To trap any dirt or foreign material in the gas supply line, a sediment 
trap must be incorporated in the piping (see Figure 21). The sediment 
trap must be readily accessible and not subject to freezing conditions. 
Install in accordance with recommendations of serving gas suppliers. 
Refer to the latest version of the National Fuel Gas Code.
To prevent damage, care must be taken not to apply too much torque 
when attaching gas supply pipe to gas valve inlet.
Apply  joint  compounds  (pipe  dope)  sparingly  and  only  to  the  male 
threads of pipe joints. Do not apply compounds to the first two threads. 
Use compounds resistant to the action of liquefied petroleum gases.
GAS METER SIZE – NATURAL GASES ONLY
Be  sure  the  gas  meter  has  sufficient  capacity  to  supply  the  full  rated 
gas input of the water heater as well as the requirements of all other 
gas fired equipment supplied by the meter. If gas meter is too small, ask 
the gas company to install a larger meter having adequate capacity.
GAS PIPING AND SEDIMENT TRAP INSTALLATION
FIGURE 21.
GAS LINE LEAK TESTING
Fire and Explosion Hazard
Leak test before placing the water
heater in operation.
Disconnect gas piping and main gas
shutof f valve before leak testing.
Install sediment trap in accordance
with NFP A 54.
Use joint compound or 
Teflon tape
compatible with propane gas.
Any time work is done on the gas supply system perform a leak test 
to avoid the possibility of fire or explosion.
1.  For  test  pressures  exceeding  1/2  psi  (3.45  kPa)  disconnect  the 
water heater and its Main Gas Shutoff Valve from the gas supply 
piping  system  during  testing,  see  Figure  21.  The  gas  supply  line 
must be capped when disconnected from the water heater.
2.  For  test  pressures  of  1/2  psi  (3.45  kpa)  or  less,  the  water  heater 
need  not  be  disconnected,  but  must  be  isolated  from  the  supply 
gas line by closing the Main Gas Shutoff Valve during testing.
3.  Coat  all  supply  gas  line  joints  and  connections  upstream  of    the 
water  heater  with  a  non-corrosive  soap  and  water  solution  to 
test  for  leaks.  Bubbles  indicate  a  gas  leak.  Do  not  use  matches, 
candles, flame or other sources of ignition for this purpose.
4.  Repair any leaks before placing the water heater in operation.
PURGING
Gas line purging is required with new piping or systems in which air 
has entered.
Purging should be performed per the current edition of NFPA 54 the 
National Fuel Gas Code.  
						

							25
 is locked out, the power to the unit must be cycled to restart the 
  Ignition Control.
8.  If  the  pilot  flame  is  proved  during  the  ignition  trial  period,  the 
  Ignition  Control  turns  off  the  Spark  Ignitor  and  opens  the  Main 
  Gas Valve.
9.  The  Ignition  Control  allows  a  2  second  pilot  flame  stabilization  
  period  to  insure  that  the  pilot  flame  is  not  extinguished  by  the 
  main burner light-off process.
10.  The  Ignition  Control  monitors  the  Flame  Sensor  during  the 
  heating cycle. If the flame signal is lost, the Ignition Control shuts 
  the Main Gas Valve and Pilot Gas Valve and re-starts the ignition  
  process at step 4.
11.  Once  the  unit  is  satisfied,  the  Ignition  Control  will  shut  off  the 
  Main  Gas  Valve  and  the  Pilot  Gas  Valve  and  the  unit  will  be  in 
  standby  mode  until  another  call  for  heat  is  initiated  by   
  the thermostat.
See the flow chart on page 26 for more information. Light  the  water  heater  in  accordance  with  the  Lighting  and 
Operation Instruction label on the water heater and in this manual 
on pages 27 and 28.
The  water  heaters  covered  by  this  manual  are  equipped  with 
an  electronic  control  system  that  automatically  sequences 
the  Igniter,  the  24  VAC  Gas  Valve,  the  Burner  ignition,  and   
flame sensing. 
Before attempting start up, thoroughly study and know the exact 
Sequence Of Operation. See written Sequence Of Operation on 
page 25 and Sequence Of Operation Flow Chart on page 26.
Be c er tain that the water heater is full of water, that air is purged 
from  the  gas  and  water  lines  and  that  there  are  no  leaks  in  the 
gas and water lines. Ensure all inlet water valves are open.
FILLING THE WATER HEATER
Follow these steps to fill the water heater prior to start up.
1.  Close the heater drain valve.
2.  Open a nearby hot water faucet to permit air in system to escape.
3.  Fully  open  the  cold  water  inlet  valve  allowing  the  piping  and 
  water heater to fill with water.
4.  Close hot water faucet opened in Step 2 as water starts to flow.
Read SEQUENCE OF OPER ATION section of this manual prior 
to lighting and operating this water heater.
With above conditions satisfied, start the unit in accordance with 
the  instructions  on  the  operating  label  attached  to  the  heater. 
For  your  convenience  a  copy  of  the  instructions  are  shown  on 
pages 27 and 28.
Fire or Explosion Hazar d
Read instruction manual befor e
installing, using or servicing water heater .
To avoid risk of fire or explosion purge discharge must not
enter into confined areas or spaces where ignition can occur .
The area must be well ventilated and all sources of ignition
must be deactivated or removed.
Gas line purging is required with new piping or systems in
which air has entered.
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. 
OPERATION
SEQUENCE OF OPERATION
The  following  information  will  describe  the  Sequence  of  Operation 
for this water heater.
1. Switch power on to unit.
2.  Thermostat calls for heat.
3.  Ignition  Control  performs  diagnostic  self  check  on  system 
  components.
4.  The Ignition Control begins the trial for ignition.
5.  The Ignition Control turns on the Spark Igniter and opens the Pilot 
  Gas Valve.
6.  The Ignition Control monitors the Flame Sensor during the ignition  
  trial period.
7.  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.  Depending  on  the  water 
  heater model, the Ignition Control will either retry the ignition trial 
  at step 4 or lockout the ignition sequence. If the ignition sequence   
						

							26
SEQUENCE OF OPERATION FLOW CHART
Description of this flow chart can be found in the “SEQUENCE OF OPERATION” section found on page 25.
FLOW CHART 1.
A
A
IDLE
(NOT  POWERED)
“CALL  FOR HEAT ”
RECEIVED FROM THERMOSTAT
POWER  TO
MODULE  AND
SELF CHECK
TRIAL  FOR
IGNITIO N
(TIMER ST ARTED)
FLAME
PROVED? CLOSE PILOT
GAS VA LVE SP
ARK OFF
(BEFORE  TRIAL FOR IGNITION  TIMER EXPIRES)
SP ARK OFF
OPEN MAIN GA S
VA LVE
FLAME
ST ABILIZA TION
(2 SECONDS)
RUN NO
NO
NO
YES
YES
YES
“CALL
FOR HEAT ”
ENDS? FLAME
LOST? CLOSE MAIN GAS
VA LVE AND PILOT
GAS VA LVE
CLOSE MAIN GAS
VA LVE  AND PILOT
GAS VA LVE
SP
ARK ON OPEN PILOT GAS
VALVE RETR
Y DELA Y
(5 MINUTES) WA
IT FO R
“CALL  FOR HEAT ”
TO  BE REMOVED
ACTIVA TE ALARM
CONT ACT(S)
(OPTIONAL)
RETR Y OR
LOCKOUT MODEL? LOCKOUT
RETR
Y  
						

							27
LIGHTING & OPERATION LABEL
FIGURE 22. LABEL FOR NATURAL GAS MODELS
FOR YOUR SAFETY READ BEFORE OPERATINGOPERATING INSTRUCTIONS
FOR YOUR SAFETY READ BEFORE OPERATING  
						

							28
FIGURE 23. LABEL FOR PROPANE GAS MODELS
FOR YOUR SAFETY READ BEFORE OPERATINGOPERATING INSTRUCTIONS
TO TURN OFF GAS TO APPLIANCE  
						

							29
ADJUSTMENTS
ON INITIAL STARTUP SOME ADJUSTMENTS MAY BE NECESSARY.
Check  Manifold  and  inlet  gas  pressures  (see  GAS  SUPPLY 
SYSTEMS on page 13 and CHECKING THE INPUT on page 29-30.)
Check Pilot Burner (See Pilot Burner section on page 34.)
TESTING DAMPER OPER ATION
With  the  Service  Switch  in  the  AUTOMATIC  OPER ATION 
position, check the operation of the flue damper three (3) times 
with the water operating controls for proper operating sequence:
• The damper disc must be open (in the vertical position) before 
the ignition and combustion process begins.
•  The damper disc must be in the open position when the main 
burner is firing.
•   The  gas  control  valve  must  close  and  the  main  burner  must 
have ceased firing before the damper disc begins its return to 
the closed (horizontal) position.
If  during  testing  of  the  operation  of  the  damper  you  find  that 
there  is  a  problem  with  the  operation  of  the  water  heater  when 
the Service Switch is in the AUTOMATIC OPER ATION position: 
Reset the Service Switch to the HOLD OPEN DAMPER position 
and check operation again.
If the water heater does operate when placed in the HOLD OPEN 
DAMPER position:
•    Refer to the EFFIKAL RVGP-FSF-SERIES TROUBLESHOOTING GUIDE on page 37.
If  the  water  heater  does  not  operate  with  the  Service  Switch  in 
either position:
•  Refer to the Troubleshooting Sections and Troubleshooting 
Checklist.
CHECKING VENTING
The following steps shall be followed with each appliance connected 
to the venting system placed in operation, while any other appliances 
connected to the venting system are not in operation.
1.  Seal any unused openings in the venting system.
2.   Inspect the venting system for proper size and horizontal pitch, as 
required in the National Fuel Gas Code, ANSI Z223.1or the CAN/
CGA B149 Installation Codes and these instructions.  Determine 
that there is no blockage or restriction, leakage, corrosion and 
other deficiencies which could cause an unsafe condition.
3.  So  far  as  is  practical,  close  all  building  doors  and  windows  and all doors between the space in which the water heater(s) 
connected to the venting system are located and other spaces 
of  the  building.  Turn  on  all  appliances  not  connected  to  the 
venting system. Turn on all exhaust fans, such as range hoods 
and  bathroom  exhausts,  so  they  shall  operate  at  maximum 
speed. Close fireplace dampers.
4.    Follow  the  lighting  instruction.  Place  the  water  heater  being  inspected in operation. Adjust thermostat so water heater shall 
operate continuously.
5.  Test for draft hood spillage at the relief opening after 5 minutes 
of main burner operation.
6.  After it has been determined that each appliance connected to  the venting system properly vents when tested as outlined above, 
return doors, windows, exhaust fans, fireplace dampers and any 
other gas burning appliance to their previous conditions of use.
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
For installation locations with elevations above 2000 feet, refer 
to HIGH ALTITUDE INSTALLATIONS section of this manual for 
input reduction procedure.
1.   Attach a pressure gauge or a manometer to the manifold 
pressure tap on the gas control valve and  refer to Table 
8, for correct manifold pressure.
2.  Use this formula to “clock” the meter.  Be sure that other 
gas  consuming  appliances  are  not  operating  during  this 
interval.
  (3600/T) x H = Btuh
  T  =  Time in seconds to burn one cubic foot of gas.
  H = Btu’s per cubic foot of gas.
  Btuh = Actual heater input.
  Example: 
  T  =  15.1 seconds
  H  =  1050 Btu
  Btuh  =  ?
  (3600/15.1) x 1050 = 250,000
TABLE 8.
APPROXIMATE TIME REQUIRED TO CONSUME 1 CU. FT. OF GAS AT FULL CAPACITY
INPUT RATE 
(BTUH) TYPE 
OF 
GAS BTUH 
PER 
CU. FT. TIME REQ’D TO 
CONSUME 1 CU.  FT. OF  GAS
120,000 NATURAL 
PROPANE 1050 
2500 31. 5 SEC. 
75.0 SEC.
154,000 NATURAL 
PROPANE 1050 
2500 24.5 SEC. 
58.4 SEC.
180,000 NATURAL 
PROPANE 1050 
2500 21.0 SEC. 
50.0 SEC.
199,000 NATURAL 
PROPANE 1050 
2500 19.0 SEC. 
45.2 SEC.
250,000 NATURAL 
PROPANE 1050 
2500 15.1 SEC. 
36.0 SEC.
251,000 NATURAL 
PROPANE 1050 
2500 15.1 SEC. 
35.9 SEC.
275,000 NATURAL 
PROPANE 1050 
2500 13.7 SEC. 
32.7 SEC.
305,000 NATURAL 
PROPANE 1050 
2500 12.4 SEC. 
29.5 SEC.
365,000 NATURAL 
PROPANE 1050 
2500 10.4 SEC. 
24.7 SEC.
390,000 NATURAL 
PROPANE 1050 
2500 9.7 SEC. 
23.1 SEC. 
						

							30
FIGURE 24.
UNDER  NO  CIRCUMSTANCES  SHOULD  THE  GAS  INPUT  EXCEED 
THE  INPUT  SHOWN  ON  THE  HEATER  MODEL  AND  RATING 
PLATE.  OVERFIRING  COULD  RESULT  IN  DAMAGE  OR  SOOTING 
OF  THE  HEATER.
Should it be necessary to adjust the gas pressure to the burners to obtain the full input rate, the steps below should be followed:
3.   Remove the regulator adjustment sealing cap and adjust the pressure  
by turning the adjusting screw with a screwdriver. See Figure 24.
 
 Clockwise to increase gas pressure and input rate.
 
 Counterclockwise to decrease gas pressure and input rate.
4. “Clock” the meter as in step 2 above.
5. Repeat steps 3 and 4 until the specified input rate is achieved.
6.  Turn  the  gas  control  knob  to  PILOT.    Remove  the  pressure  gauge and replace the sealing cap and the Allen wrench set 
screw in the pressure tap opening.