3
3.
Before Installation
Checkup
• Check the mounting brackets and vent pipe yearly for damage or wear. Replace if necessary.
DANGER
Do Not Use Equipment for Purposes Other Than Those Specied
• Do not use for other than increasing the temperature of the water supply, as unexpected accidents
may occur as a result.
Check Water Supply Quality
• If the water supply is in excess of 12 grains per gallon (200 mg/L) of hardness, acidic or otherwise
impure, treat the water with approved methods in order to ensure full warranty coverage.
WARNING
CAUTION
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 Btu/h/ 120,000Btu/h (DHW / Heating mode)
of NRCB199DV(GHQ-C3201WX-FF US).
Check that the gas supply line is sized for
180,000 Btu/h/ 100,000Btu/h (DHW / Heating mode)
of NRCB180DV(GHQ-C2801WX-FF US).
Check the Power
• The power supply required is 120VAC, at 60Hz.
Using the incorrect voltage may result in re or electric shock.
Precautions on Vent Pipe Replacement
• The vent system will almost certainly need to be replaced when this appliance is being installed.
Only use vent materials that are specied in this Installation Manual for use on this appliance. Refer
to the "Vent Pipe Installation" section for details. If PVC, CPVC, or Category IV listed pipe is already
installed, check for punctures, cracks, or blockages and consult with the vent pipe manufacturer
before reusing.
Improper venting may result in res, 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.
e.g. NRCB199DV(GHQ-C3201WX-FF US)
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