Max-Ox MX-900B Operator's Manual page 28

The MX-900B must be shimmed level and plumb during installation.
All aspects of installation shall conform to good plumbing, electrical, or
HVAC trade practices.
Proper pump(s) and piping sizing is the responsibility of your qualified
installer.
The Max-Ox™ MX-900B is an open system NON-PRESSURIZED
hydronic Boiler. DO NOT PRESSURIZE.
An open (vented) expansion tank must be incorporated into the system in
order to maintain the heat exchanger (boiler) full of water at all times, and to
prevent pressurization. No valve or restriction is permissible in the pipe
connecting the heat exchanger to the expansion tank. Please allow for a
minimum of 20 gallons of water volume thermal expansion for the heat
exchanger water thermal expansion. Additional vented expansion tank
thermal expansion allowance will be required to accommodate your
hydronic system thermal expansion.
When interfacing with an existing pressurized heating system, a heat
exchanger is required.
Once installed and filled, add boiler water treatment immediately.
In order to minimize corrosion of your carbon steel heat exchanger whetted
surfaces, you must follow a bi-annual (every 6 months) commercial boiler
water chemistry program for boiler water chemical analysis, chemical
treatment, boiler water blow-down, and boiler water make-up water addition
for an open-system (non-pressurized) hydronic heating boiler.
Failure to follow a bi-annual commercial boiler water treatment program
will void the Limited Warranty:
Please fix any piping system leaks as soon as possible. Frequent additions of
fresh make-up water introduces corrosive oxygen into the system.
Max-Ox™ MX-900B Operators Manual, Rev. 0
Page 28 of 54