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3.
Before Installation
Do Not Use Equipment for Purposes Other Than Those Specified
• The NH199-DV/ NH150-DV is a boiler to be used for space heating or indirect water heating
only. Do not use the hot water supplied by the boiler for drinking purposes.
• This boiler has a pressure rating of up to 150 psi, but it is designed to be used in a low pres-
sure (15 psi) closed loop heating system. Use a 30 psi relief valve.
Checkup
• Once a year, check the fixing brackets, the air supply and exhaust pipes and the flue terminals
to see if they need to be replaced.
Precautions on Vent Pipe Replacement
• The vent system will almost certainly need to be replaced when this appliance is being installed.
Use vent pipe that is listed to UL 1738 for Category III appliances for the exhaust venting. Category
III listed vent pipe is suggested for the air supply pipe also, but other materials may be acceptable.
Consult local codes.
* If Category III listed vent pipe is already installed, check for punctures, cracks or blockages and
consult with the vent pipe manufacturer before reusing.
Use Approved Vent Materials
• Use only vent materials that are listed to UL 1738 for Category III appliances for the exhaust venting
of this appliance.
Improper venting may result in fires, property damage or exposure to Carbon Monoxide.
Snow Precaution
• If this product will be installed in an area where snow is known to accumulate, protect the vent
termination from blockage by snow drifts or damage from snow falling off of roofs.
Check the Gas
• Check that the rating plate indicates the correct type of gas.
• Check that the gas supply line is sized for 199,900 Btuh for
the NH199-DV, or 150,000 Btuh for the NH150-DV.
Check the Power
• The power supply required is 120VAC, at 60Hz.
Using the incorrect voltage may result in fire or electric shock.
Check Water Supply Quality
• If the water supply is hard, acidic or otherwise impure, treat the water with approved methods in
order to ensure full warranty coverage.
Use the Specified Anti-Freeze
• When using anti-freeze, use Noritz approved anti-freeze only.
Using an anti-freeze other than one specified by Noritz could lead to leakage of fluid (water) or
clogging of pipes.
DANGER
WARNING
CAUTION
NH199-DV
3
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