American Water Heater 74 Gallon 80 Thermal Efficiency UltraLow NOx Heavy Duty Commercial Gas Water Heater User Manual

11SETTING THE WATER HEATER TEMPERATURE AT 120°F (49°C) 
(APPROX. "
" MARK ON FACE OF THE TEMPERATURE ADJUSTING 
DIAL) WILL REDUCE THE RISK OF SCALDS.  Some States or Provinces 
require settings at specific lower temperatures.
Figure 6 shows the approximate water temperatures produced at various 
thermostat settings. Short repeated heating cycles caused by small hot 
water uses can cause temperatures at the point of use to exceed the 
thermostat setting by up to 20°F (11°C). If you experience this...

121. 
Provide complete combustion of gas.
2.  Cause rapid ignition and carryover of flame across entire burner.
3.   Give reasonably quiet operation during ignition, burning and extinction.
4.  Cause no excessive lifting of flames from burner ports.
If preceding burner characteristics are not evident, check for accumulat\
ion 
of lint or other foreign material that restricts or blocks the air openi\
ngs 
to the heater or burner.
  WARNINGSOOT BUILD-UP INDICATES A PROBLEM THAT REQUIRES 
CORRECTION BEFORE...

13
BLOWER MAINTENANCE
For safety and satisfactory operation it is recommended that the blower 
be checked once a year by a competent service person.
1. MOTOR - The motor is factory oiled and sealed and requires no 
further maintenance.
2.  WHEEL - Wheel must be clean of soot, ash or any other coating 
which inhibits either rotation or air flow.  Remove all foreign material 
from vent system.
3.   The pressure switch is inside the blower control box and is connected 
to the blower housing with a tube....

14
TANK CLEANOUT PROCEDURE
The following practices will ensure longer life and enable the unit to 
operate at its designed efficiency:
1. Once a month the heater should be flushed.  Open the drain valve 
and allow two gallons of water to drain from the heater.  Inlet water 
valve should remain open to maintain pressure in tank.
2.  A cleanout opening is provided for periodic cleaning of the tank.  
Gas must be shut off and heater drained before opening cleanout.
To clean heater through cleanout opening,...

15
cold water inlet line and allow water to flow through heater and out 
drain valve.  Don’t forget to plug vent and cap opening in Flo-Jug.
9.  When flushing is completed:
  • Fill heater being certain to expel air from tank through a nearby 
hot water faucet or, if removed, the relief valve opening.
  • The heater relief valve can be washed in UN•LIME if it is limed.
  • Replace relief valve if removed for deliming.
  • Restore gas, oil or electrical supply to heater.
  • Check for water leakage.
10....

16
NOTE: Anode must remain installed (except for inspection) to 
avoid shortening tank life.  See LIMITED WARR ANTY.  Replace 
as necessary.
SERVICE AND REPAIR
The water heater requires no special care other than the normal 
maintenance as noted above.  If you are having a problem with your 
water heater, before calling for service please refer to the following 
TROUBLESHOOTING sections.  If service becomes necessary, 
contact your dealer, installer or an authorized service agent.  Do not 
attempt to...

17
TROUBLESHOOTING 
For your safety, water heater service should be performed only by a qualified service technician.  Read the GENERAL SAFETY INFORMATION section first. 
PROBLEM POSSILBE MALFUNCTION SERVICE TO BE PERFORMED
NOT ENOUGH OR NO HOT WATER 1) Blower will not run.
A) "ON/OFF" control switch turned off. Turn switch to the on position.
B) Blower unplugged. Plug blower back into 115 vac. outlet.
C) No power at outlet. Repair service to outlet.
D) "ON/OFF" switch defective. Replace...

18
TROUBLESHOOTING GUIDELINES
TROUBLE SHOOTINGPlease check guidelines below.  For your safety, water heater service should be performed only by a qualified service technician.  Read the GENERAL SAFETY INFORMATION section first.
INTELLI-VENT TROUBLESHOOTING CHART - USER CONTROL
    PROBLEM    SOLUTION
   Inadequate or no earth ground   1. Ensure the wall outlet is properly grounded.
  1  sensed by the Intelli-Vent™
    control.  2. Ensure all ground connections/wires on the 
       water heater are...

19
TROUBLESHOOTING GUIDELINES
TROUBLE SHOOTINGPlease check guidelines below.  For your safety, water heater service should be performed only by a qualified service technician.  Read the GENERAL SAFETY INFORMATION section first.
INTELLI-VENT TROUBLESHOOTING CHART - USER CONTROL
PROBLEMSOLUTION
Ignition/ame failure.
6 The water heater has reached th e
maximum number of retries and is
currently lockedoutfor one hour .
Cycle the power to the water heater
of f and on to reset.
Service Note: Ther esistance(...

20
TROUBLESHOOTING GUIDELINES
TROUBLE SHOOTINGPlease check guidelines below.  For your safety, water heater service should be performed only by a qualified service technician.  Read the GENERAL SAFETY INFORMATION section first.
INTELLI-VENT TROUBLESHOOTING CHART - USER CONTROL
PROBLEMSOLUTION
15
#       LED ST ATUS
B  C D  E  F1. Turn off power to the water heater.   
2. Unplug the ignitor assembly plug from the control. Check 
 t he resistance of the black resistor wire between pins  
  3 & 4 with an...