OMM-0153_E
• 5/11/2023 Technical Support • (800) 526-0288 • Mon-Fri, 8 am - 5 pm EST Page 69 of 124
CENTURION Installation, Operation & Maintenance Manual
SECTION 7: MAINTENANCE
7.9 Shutting Water Heater Down for Extended Period (One Year or More)
1. Set Enable/Disable switch on the front panel to the
Disable
position.
2. Disconnect AC power from the unit.
3. Close the water supply and return valves to isolate Water Heater.
4. Close external gas supply valve.
5. Open relief valve to vent water pressure.
6. Open the drain valve and drain all water from the unit.
7. If the temperature in the storage location will ever get below freezing,
for even a short
time
, you must drain
all
water from the unit
before
the temperature falls below freezing.
Step 6 is not sufficient, as it leaves some water in the bottom of the heat exchanger
chamber. You must then use a suction pump inserted through the inspection ports to
remove
all
water from the bottoms of the heat exchanger chamber and base assembly.
W A R N I N G !
Failure to drain all water may cause heat exchanger tubes to crack and fail.
7.9.1 Returning The Water Heater to Service After Shutdown
1. Review installation requirements included in Section 2.
2. Inspect all piping and connections to the unit.
3. Inspect exhaust vent and air inlet duct work (if applicable).
4. Perform initial startup per Section 5.
5. Follow the Safety Device Testing instructions in Section 6.
7.10 Recommended Periodic Testing
W A R N I N G !
Periodic testing of all Water Heater controls and safety devices is required to ensure they
continue to operate as designed. Precautions must be taken while tests are being performed
to protect against bodily injury and property damage. The owner or user of an automatic
Water Heater system should set up a formal system of periodic preventive maintenance and
testing. Tests should be conducted on a regular basis and the results recorded in a logbook.
Recommended Periodic Testing
ITEM
FREQUENCY
ACTION BY
REMARKS
Gauges, monitors and
indicators
Daily
Operator
Visual inspection and record readings in operator log
Instrument and
equipment settings
Daily
Operator
Visual check against factory recommended specifications
Weekly
Operator
Verify factory settings
Firing Rate Control
Semi-Annually Service Tech
Verify factory settings
Annually
Service Tech
Check with combustion calibration test equipment (see
Section 5.2) and the O
2
sensor (Section 7.4).
Flue, vent, stack and
intake air duct
Monthly
Operator
Visually inspection condition and check for obstructions
Spark Igniter-Injector
Weekly
Operator
See Section 7.2:
Ignitor-Injector
in this guide.
Air/Fuel Valve position Weekly
Operator
Check position indicator dial. See Section 4.2.
SSOV Leakage test
Annually
Service Tech
Check for leakage in accordance with the SSOV
manufacturer’s (Siemens) recommendations.
Flame failure
Weekly
Operator
Close manual gas shutoff valve and check safety shutdown.
See Section 6.7.
