Installation Instructions

23
Measuring inlet gas pressure
1. Turn off all electric power to the micro boiler if service is to be performed.
2. Turn the manual gas valve located on the outside of the unit clockwise to
the off position.
3. Failure to follow these steps could lead to a re or explosion, resulting in
personal injury or death.
1. Shut off the manual gas valve on the gas supply line.
2. Remove the screw for the pressure port located on the
gas inlet of the micro boiler shown in the diagram on the
right.
3. Connect the manometer to the pressure port.
4. Re-open the manual gas valve. Check to see that there
are no gas leaks.
5. Check in inlet gas pressure. When the micro boiler is on
maximum and minimum burn, the manometer should
read from 5.0” W.C. to 10.5” W.C. (1.24 to 2.61 kPa) for
Natural Gas, from 8.0” to 14.0” W.C. (1.99 to 3.48 kPa)
for Propane.
The micro boiler cannot perform properly without sufcient inlet gas pressures. Below are instructions
on how to check the inlet gas pressure. THIS IS ONLY TO BE DONE BY A LICENSED PROFESSIONAL.
WATER CONNECTIONS
Do not use the micro boiler if any part has been under water. Immediately
contact a qualied installer or licensed professional to inspect the boiler to
determine if it needs to be replaced.
Do not reverse the hot outlet and cold inlet connections to the micro boiler.
This will not properly activate the micro boiler.
All pipes, pipe ttings, valves and other components, including soldering materials, must be suitable
for potable water systems (when using combi panel), or distilled water or distilled water/glycol mix.
1. A manual shutoff valve must be installed on the cold water inlet to the micro boiler between the
main water supply line and the micro boiler.
2. In addition, a manual shutoff valve is also recommended on the hot water outlet of the unit. If the
micro boiler is installed within, or subjected to,
a closed loop system (recommended), a ther-
mal expansion tank or code approved device
to handle the thermal expansion must be
installed.
3. Before installing the micro boiler, ush the
water line to remove all debris, and after in-
stallation is complete, purge the air from the
line. Failure to do so may cause damage to the
boiler.
NOTICE
WARNING
WARNING
Pressure port
Cold
Hot
inlet
outlet
Gas inlet
As Close as
Possible
Pressure relief valve