Mr. Heater MH40NG Operating Instructions And Owner's Manual page 4

Heater has four mounting holes, two on each end, for attaching
rod, chain, or angle iron brackets and shall be safely and
lines.
capacity of pipe of different diameters and lengths in cubic feet
resistant to the action of all gases.
function.
the gas supply line.
NOTE:
being maintained at the main gas line, a separate regulator must
On a multiple heater installation in may be possible to use one
system a loop.
pressure reducing design stage.
Make sure that the electrical characteristics of the thermostat
freely around it.
Ensure that the selected thermostat location meets all of the
the thermostat for additional general information and mounting
instructions.
by 1 inch sheet metal screws, included with the thermostat, and
mount the thermostat in the selected location.
the back plate of the thermostat as a template to mark the hole
location, drill appropriate size anchor holes, install the anchors and
Gas valve
securely attach the thermostat using the mounting screws.
connection
requirements
Figure 4 connection diagram
4