Sediment and lime scale removal may be accomplished through the cleanout opening furnished on the heater. The heater must be drained, see DRAINING, before removing cleanout cover on tank.
To dissolve and remove the more stubborn mineral deposits, SRT80-120NE UN•LIME® Professional Delimer should be used.
SRT80-120NE UN•LIME® Professional Delimer is an easy to handle patented food grade acid formulated specifically for lime scale removal from all types of water using equipment. Available in 1 gallon (3.8L) (part no. 4763) and 5 gallon (19L) (part no. 4813) sizes. Hydrochloric base acids are not recommended for use on glass-lined tanks.
SRT80-120NE Form No. 4800, entitled “Why, When and How”, describes tank cleaning methods and materials. UN•LIME and the booklet may be obtained through your State dealer or distributor.
To clean heater through cleanout opening, proceed as follow:
1.Turn off water inlet valve, the heater electrical disconnect switch and open gate valve.
2.Drain the tank.
3.Remove cover from cleanout opening on front of tank assembly.
4.Remove lime, scale or sediment using care not to damage the glass-lining.
5.Inspect cleanout plate gasket.
6.Install cleanout plate. Be sure to draw plate up tight by tightening screws securely.
7.Close gate valve, open water inlet line and turn on the power burner electrical disconnect switch.
8.Check for water leakage.
ANODE INSPECTION AND REPLACEMENT
This water heater is equipped with a sacrificial anode. Anodes protect the glass-lined tank from corrosion by sacrificing themselves through electrolysis. When the anode material is consumed, there is no more protection and corrosion of the tank accelerates
Inspection of the anode every 6 to 12 months allows you to identify a spent anode and replace it. Replace the anode when its diameter is 3/8" (1cm) of an inch, or annually which ever is first. Aggressive, very hot and softened water causes rapid consumption of the anode requiring frequent inspections. Anodes are available from your distributor or State Industries.
To inspect or replace an anode:
The anodes on this heater are easily accessible from the front of the heater making replacement simple and quick.
1.Turn the heater off per the lighting instructions.
2.Open the drain valve to flush any sediment out of the bottom of the heater.
3.Shut off the cold water supply. Make sure all hot water fixtures and circulating pumps are turned off.
4.Make sure tank is drained. Remove the anode using a socket of the appropriate size. Do not use an impact wrench.
5.Inspect and replace the anode as required. Use a pipe tape or sealant when reinstalling the anode.
6.Close the drain valve. Open a hot water fixture to allow air to escape. Open the cold water supply to heater and allow the tank to fill. Follow the lighting instructions.
7.Check your anode and drain valve for leaks.
DRAIN VALVE AND ACCESS PANELS
The heater is equipped with a 3/4" drain valve.
An access panel covers the front of the tank.
RELIEF VALVE
At least twice a year, the temperature and pressure relief valve should be checked to ensure that it is in operating condition. To check the relief valve, lift the lever at the end of the valve several times. The valve should seat properly and operate freely.
If water does not flow, remove and inspect for obstructions or corrosion. Replace with a new valve of the recommended size as necessary. Inspection of the valve should be performed at least every three years. Do not attempt to repair the valve, as this could result in improper operation and a tank explosion. In areas with poor water conditions, it may be necessary to inspect the T&P valve more often than every three years.
CAUTION
BEFORE MANUALLY OPERATING THE VALVE, MAKE SURE THAT A DRAIN LINE HAS BEEN ATTACHED TO THE VALVE TO DIRECT THE DISCHARGE TO AN OPEN DRAIN. FAILURE TO TAKE THIS PRECAUTION COULD MEAN CONTACT WITH EXTREMELY HOT WATER PASSING OUT THE VALVE DURING THIS CHECKING OPERATION.
If the temperature and pressure relief valve on the heater discharges periodically or continuously, it may be due to thermal expansion of water in a closed water supply system, or, it may be due to a faulty relief valve.
Thermal expansion is the normal response of water when it is heated. In a closed system, thermal expansion will cause the system pressure to build until the relief valve actuation pressure is equaled. Then, the relief valve will open, allowing some water to escape, slightly lowering the pressure.
Water heater damage due to installation in a closed system is not covered by the limited warranty. The solution is to install a thermal expansion tank between the check valve and the water heater.
ABOVE ALL, DO NOT PLUG THE TEMPERATURE AND PRESSURE RELIEF VALVE. THIS IS NOT A SOLUTION AND CAN CREATE A HAZARDOUS SITUATION.
CIRCULATING PUMP
The water heating system includes several circulating pumps. It should be lubricated as directed by the circulator manufacturer.
VENT SYSTEM
Examine the vent system every 3 months. Points of inspection are as follows:
1.Check for obstructions and/or deterioration of vent terminals.
2.Vent from screen should be cleaned of foreign material and soot. The screen is located inside the vent outlet and is accessible from the outside of the hood. Do not reach inside the vent terminal when the heater is in operation.
3.Check all vent system connections for leakage and reseal as required using Hi Temp Silicone sealer or equivalent (inside cabinet).
