SVC 810 Tankless Troubleshooting Manual
8
Action Explanation
(For indoor model only) When the air intake is
blocked, or oxygen in a room is not sufficient,
the output of the thermocouple that is located
in the Oxygen Depletion Sensing Burner
(ODS) will change.
The PC Board senses this change and
controls the Fan and Proportional Gas
Control Valve in order to prevent imperfect
combustion. If the control board cannot
correct such condition, the unit will go into
an error code.
When the hot water tap is closed, the flow rate
signal from water flow sensor stops.
Gas valve is closed. Main burner shuts off.
The fan conducts a post purge. The purpose of the post purge is to cool the
heat exchanger.
Sensors and Safety
Oxygen Depletion Sensing System Operation
Oxygen Depletion Safety Device (ODSD) Sensing
Burner - Indoor Model Only
The sensing burner is a primary air type ceramic
burner that consists of an outer jacket surrounding
the flame opening and a thermocouple to detect
flame temperature. The sensing burner is located in
the part of the main burner and designed to monitor the flame condition at all times. In case the
oxygen level decreases due to blocked or clogged air intake or flue venting or by contaminated
air (not enough oxygen content), location of the flame, as well as its temperature, will change.
This change will be detected by the ODSD thermocouple.
The unit will attempt to resolve the problem on its own by adjusting the
quantity of fuel and adjusting the fan speed. During this resolution period,
the unit will show a flash code of 05 and have an audible alarm. In the
event the unit cannot fix the fuel air mixture, the unit will shut down with
a flash code of 13.
Here is how the ODS sensing system works.
1 Is the ODS thermocouple detecting normal
temperatures?
Yes Unit is operating normally. ODS Thermocouple
will detect proper temperature with 2 minutes on
a cold start and within 1 minute on a warm start.
No
2 Printed Circuit Board (PCB) will increase the
airflow rate to balance the air-fuel mixture.
PCB automatically tries to fix the problem with
increased airflow.
3 Is the ODS thermocouple detecting normal
temperatures?
Yes Unit is operating normally.
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