Lochinvar Hot Water Generator Installation And Operation Manual page 16

6
Maintenance
10. Install a new gasket on the manway or hand hole to
prevent any possible leaks. Tighten the gasket properly to
prevent leaks. Caution: Over tightening can result in
cutting the gasket and allowing a water leak to occur.
11. Replace the jacket cover over the manway or hand hole.
12. Close the drain and open the cold water supply and hot
water outlet. If the relief valve was used for a vent ensure
that it is now closed. Open the closest hot water valve to
allow the air in the tank to vent as water enters the vessel.
Close the valve opened for a vent when water flows from
the valve.
13. Check the manway or hand hole and all related piping for
any water leaks.
14. Turn on electric power to the circulating pump and other
electric components if necessary.
15. Open valves for boiler water or steam supply. Also open
the boiler water return, or condensate line.
16. Observe tank and piping to ensure all components are
functioning properly.
Figure 7_Horizontal Storage Tank w/Anodes
16
Hot Water Generator Installation and Operation Manual
Magnesium anode rod inspection
Glass lined storage tanks have a magnesium anode(s) to
provide cathodical protection of the lining and minimize
corrosion. Aggressive water conditions in some areas of the
country may accelerate the deterioration of the anode(s). The
anode(s) should be periodically removed and inspected to
determine if replacement is necessary.
The tank must be valved off from the system and fully drained
to remove an anode for inspection. Anodes are supplied in
threaded fittings on the top head of small vertical storage
tanks. Top mounted anodes may be accessed by removing the
jacket top. Large vertical storage tanks and horizontal storage
tanks have multiple anodes installed in threaded tappings
along the length of the tank. These anodes may be accessed by
removing a jacket panel and/or corner post corresponding to
the mounting point of the anodes. Adequate service clearance
is required to allow removal of an anode. The anode(s)
should be replaced when more than six inches of the core wire
is exposed at either end of the rod. Medium sized tanks with
round jackets provide an opening for individual anode rod
access.
Figure 8_Vertical Storage Tank w/Anodes