3
180,000 BTU
25,000 BTU
177
4.0
0.55
2.25
10.5
670
15
150
2
NR71-SV
3.
Before Installation
Checkup
• Check the fixing brackets and vent pipe yearly for damage or wear. Replace if necessary.
DANGER
Do Not Use Equipment for Purposes Other Than Those Specified
• 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
180,000 Btuh for NR71 series.
(140,000 Btuh for NR66 series.)
(120,000 Btuh for NR50 series.)
Check the Power
• The power supply required is 120V AC, at 60Hz.
Using the incorrect voltage may result in fire or electric shock.
Use Extreme Caution if Using With a Solar Pre-Heater
• Using this unit with a solar pre-heater can lead to unpredictable output temperatures and
possibly scalding. If absolutely necessary, use mixing valves to ensure output temperatures do
not get to scalding levels.
Ex. For Natural Gas NR71-SV
