Troubleshooting; Installation Checklist; Sequence Of Operation - State Water Heaters 301 Series Instruction Manual

INSTALLATION CHECKLIST

The list below represents some of the most critical installation
requirements that, when overlooked, often result in operational
problems, down time and needless parts replacement. This is not
a complete list. Before performing any troubleshooting procedures
use the list below to check for installation errors.
Note: Costs to correct installation errors are not covered
under the limited warranty. See
Heater Limited Warranty
Ensure all installation requirements and instructions in this manual
have been maintained and followed.
WATER HEATER LOCATION
1. Ensure proper clearances to combustibles are maintained and
there is sufficient room to service the water heater. See
(page 12).
To Combustible Materials
2. Ensure the area is free of corrosive elements and flammable
materials. See the instructions in
(page 16).
VENTING
1. Ensure the intake air and/or vent (exhaust) piping is the correct
size for the installed length. See
22).
2. Ensure the maximum equivalent feet of pipe has not been
exceeded for the intake air and/or vent pipe. See
23).
3. Ensure the maximum number of elbows has not been exceeded
in the intake air and/or vent pipe. See
4. Ensure the intake air screen has been removed from the intake
air connection on the water heater when installing the water
heater in a Direct Vent configuration. See
5. Ensure all exterior clearances for the intake air, vent, concentric,
and low profile terminations are maintained. See
(page 25),
Termination Installation
(page 31) and
Installation
(page 33). These clearances and those cited
Arrangements
by local and national codes must be maintained.
GAS SUPPLY AND PIPING
1. Ensure a supply gas regulator has been installed for each
water heater. See the requirements for a
(page 13).
2. Ensure the supply gas line to each water heater meets
the minimum supply gas line size requirements. See the
requirements for the
Gas Supply Systems
installation instructions in
(page 41).
Line Connection
CONDENSATE DRAIN
Ensure the condensate drain is properly connected to the exhaust
elbow on the water heater and draining freely to a suitable floor
drain. See (page 16) and
Figure 8
(page 39).
ELECTRICAL CONNECTIONS
1. Ensure the power supply connections to the water heater are
polarity correct. See the requirements for the
13) and (page 41).
Electrical Wiring
2. Ensure the water heater is properly grounded. Flame sensing
requires an adequate earth ground. If the water heater is not
properly grounded it will cause ignition failure.

TROUBLESHOOTING

Commercial Water
(page 76).
Clearance
Combustible Material Storage
Venting Requirements
Table 7
(page 23).
Table 7
(page 24).
Figure 18
Vertical
Concentric Termination
Multiple Concentric Termination
Supply Gas Regulator
(page 13) and the
(page 40) and
Gas Line Sizing
Condensate Drain Installation
Power Supply

SEQUENCE OF OPERATION

Read the Sequence of Operation below before attempting to
correct any operational problems. Refer to
(page 8) for the location of various water heater components
described below. See also the
(page 58).
1. When the control system is first powered, during boot up, it will
display water heater model information during initialization. After
a few moments the control system LCD Touch Display which is
part of the UIM (user interface module) will display the default
screen known as the "Desktop" screen.
2. If the control system determines that the actual water
temperature inside the tank is below the programmed Operating
Set Point minus the Differential setting, a heating cycle is
activated.
3. The control system then performs selected diagnostic system
checks. This includes confirming the low gas pressure, blocked
exhaust, blocked intake and ECO (energy cut out) switch
contacts are closed.
4. If all diagnostic checks are successfully passed, the control
system energizes the Combustion Blower for pre-purge.
5. The control system energizes the Spark Ignition Transformer.
(page
6. The control system energizes the 24-volt gas valve allowing
gas to flow to the Main Burner.
(page 7. The control system monitors the flame sensor to confirm a flame
is present at the Main Burner. If a flame is not verified during the
ignition trial period the control system will try for ignition up to
two more times. If flame can not be verified after three trials for
ignition, the control system will lock out and display the "Ignition
Failure" Fault message.
8. If a flame is verified, the control system will de-energize the
Spark Ignition Transformer and enter the heating mode where
it will continue heating the water until the Operating Set Point
is reached. At this point, the control system will de-energize the
24-volt gas valve and enter the post-purge cycle (approximately
30 seconds).
9. The water heaters covered by this manual are capable of
modulating their firing rate. The firing rate is dictated by the hot
water draw and various other temperature limitations.
10. The Combustion Blower will run for the duration of the post-
purge cycle to purge the water heater of all combustion gases.
When the post-purge cycle is complete, the blower is de-
energized and will coast to a stop.
11. The control system now enters the standby mode while
continuing to monitor the internal storage tank water
temperature and the state of other system devices. If the tank
temperature drops below the Operating Set Point minus the
Gas
Differential setting, the control will automatically return to Step
2 and repeat the operating cycle.
(page
57
Features and Components
Sequence Of Operation Flow Chart