Operating instructions

IX. MAINTENANCE
The Maxi-Therm is an extremely simple device and as such requires very little maintenance. There are, however,
several items that should be checked out on an annual or as needed basis to ensure a reliable supply of hot water:
1) On an annual basis, remove the jacket cover over the hand hole and make sure that the hand hole gasket is
leak-tight. On the 40 and 50 gallon sizes, this hand hole is located on the top of the Maxi-Therm and is
accessed by removing the two screws holding the cover to the top of the Maxi-Therm. On the 79 and 100
gallon sizes, the hand hole is located on the lower side of the Maxi-Therm.
2) Make sure that the rest of the boiler and domestic water piping is free of leaks.
3) If there is an oil-lubricated circulator in the system, make sure that it is lubricated as called for by the circula-
tor manufacturer.
4) The Maxi-Therm depends upon the boiler for a source of heat and is therefore only as reliable as the boiler.
Make sure that the boiler is maintained in accordance with the boiler manufacturer’s instructions.
5) All Maxi-Therms are equipped with a sacrificial anode rod. This anode rod helps to protect the Maxi-Therm
from corrosion. This anode rod should be inspected periodically and replaced if more than half of the anode
has been corroded away at any point in its length. The rate at which the anode rod will deteriorate will depend
upon the quantity and chemistry of the water passing through the tank. In general, an annual inspection of the
anode rod is appropriate.
6) On an annual basis, check the operation of the Temperature and Pressure Relief Valve by lifting the lever on the top
of the valve and confirming that water is released.
.
CAUTION
Stay away from the T&P Valve discharge piping when performing this check to avoid
contact with hot water. Also make sure that water from the discharge will not damage
property before performing this test.
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IMPORTANT
For the anode rod to work properly it must be electrically bonded to the Maxi-Therm
Tank. On the MT040G and MT050G, this is done with two ground wires that bond the
anode rod to the clean-out cover and the clean-out cover to the tank.
• Whenever the anode rod or clean out cover is serviced on the MT040G or
MT050G, be sure that these ground wires are reconnected.
• On the MT079G and MT100G these wires are not used; the anode rod is bonded
to the tank through the anode rod thread. When inspecting the anode rod, do not
use teflon tape on the anode rod threads.
Failure to follow these precautions could result in premature failure of the tank.