e) Dielectric Unions (recommended)- Used to electrically isolate the Maxi-Therm from the connected
domestic water piping. This helps to minimize the possibility of corrosion damage to the Maxi-Therm.
On the 40 and 50 gallon sizes, the hot water outlet is located in the clean out cover along with the
anode rod. The union in the hot water connection simplifies inspection of the anode rod.
f)
Drain (required)- Used to drain the tank for inspection or servicing.
g) Temperature / Pressure Relief Valve (required) - Opens to relieve excess pressure or temperature
which has developed in the Maxi-Therm.
h) Vacuum Breaker (Recommended)- this valve protects the tank in the event that the pressure in the tank
falls below atmospheric and aids in draining the tank. Use a Watts N-36 or equivalent.
i)
Heat Trap (Optional) - The heat trap retards the migration of heat from the Maxi-Therm up the hot
water supply pipe.
25
WARNING
Install a new Temperature and Pressure Relief (“T & P”) Valve in the tapping on the top
of the Maxi-Therm marked “T&P VALVE”. Failure to do so could result in property
damage, personal injury or death.
•
This Valve must comply with the
Standard for Relief Valves and Automatic Gas Shutoff
devices for Hot Water Supply Systems
(ANSI Z21.22)
•
No valve is to be placed between the T&P valve and the Maxi-Therm
•
Do not install valves, reducing couplings or other obstructions in the relief valve dis-
charge line.
•
Do not install a T&P valve with a pressure setting in excess of 150 psi or a temperature
setting in excess of 210F
•
See Table 6 for T&P Valve capacity sizing
•
Pipe the discharge line to a location where hot water discharge will not cause injury or
damage
.
•
Do not run any portion of the discharge line through a location that will be exposed to
freezing temperatures.
•
Pipe the discharge line to allow complete drainage of both the discharge piping and
the T & P valve.
TABLE 6: MINIMUM T&P VALVE SIZES
*
If the Maxi-Therm is connected to a boiler with a Gross Output LESS than the “Max. T&P Valve Capacity”
shown below, install a T&P valve having a capacity greater than or equal to the boiler’s Gross Output.
*
If the Maxi-Therm is connected to a boiler with a Gross Output GREATER than the “Max. T&P Valve
Capacity” shown below, install a T&P valve having a capacity greater than or equal to the “Max T&P Valve
Capacity”.
MODEL
MAX. T&P VALVE CAPACITY
MT040G
140400
MT050G
154200
MT079G
201400
MT100G
310000
