Polaris BSS, Инструкция по эксплуатации, Страница: 48 / 63

48
TROUBLESHOOTING
Components beginning on page 11 for the location of various
water heater components described below. See the Sequence of
Operation Flow Chart on page 49 also.
1. When the control system is first powered, during boot up, the
blower will run momentarily and stop, and the control system
will display water heater model information during initialization.
After a few moments the control system LCD 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 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.
6. After a few seconds, the control system energizes the 24V
Gas Control Valve allowing gas to flow to the Main Burner.
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 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 V Gas Control 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
Differential setting, the control will automatically return to Step
2 and repeat the operating cycle.
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. Costs to correct
installation errors are not covered under the 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
Locating the Water Heater section on pages 15-16.
2. Ensure the area is free of corrosive elements and flammable
materials. See Combustion and Ventilation Air on page 16.
VENTING
1. Ensure the intake air and/or vent (exhaust) piping is the correct
size for the installed length. See the Vent Pipe Installation
section beginning on Page 22.
2. Ensure the maximum equivalent feet of pipe has not been
exceeded for the intake air and/or vent pipe. See the Vent
Pipe Installation section beginning on Page 22.
3. Ensure the maximum number of elbows has not been
exceeded in the intake air and/or vent pipe. See the Vent Pipe
Installation section beginning on Page 22.
4. Ensure all exterior clearances for the intake air, vent and
concentric terminations are maintained. These clearances and
those cited by local and national codes must be maintained.
See Horizontal Vent Terminal Installation on page 25, Vertical
Vent Termination on page 26, and Concentric Vent Installation
on page 29.
5. Ensure the integrated filter in air intake at the water heater is
clean and free of debris. See Integrated Filter Preventative
Maintenance on page 54.
GAS SUPPLY AND PIPING
1. Ensure a supply gas regulator has been installed for each
water heater. See Supply Gas Regulator on page 17.
2. Ensure the supply gas line to each water heater meets the
minimum supply gas line size rrequirements. See Supply
Gas Systems on page 17 and Supply Gas Line Installation
beginning on Page 31.
CONDENSATE DRAIN
1. Ensure the condensate drain is properly connected to the
exhaust elbow on the water heater and draining freely to a
suitable floor drain. See Condensate Drain Installation on
page 31.
ELECTRICAL CONNECTIONS
1. Ensure the power supply connections to the water heater are
polarity correct. See the requirements for the Power Supply on
page 18 and Electrical Wiring on page 33.
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. See Electrical
Wiring on Page 33.
SEQUENCE OF OPERATION
Read the Sequence of Operation below before attempting to
correct any operational problems. Refer to the Features and