NTI INSTALLATION MANUALS

Part 1 - General Safety Information

I. High Elevation Installations

CAUTION

WARNING

On TRX085 / TRX120 Models ONLY If the boiler is to be used only in Heating Mode (not connected to an indirect water heater), the electrical connection of the 3-way valve motor MUST BE DISCONNECTED while the boiler is operating in central heating mode. This will lock the valve motor in central heating mode and ensure freeze protection operates properly. Failure to disconnect the valve may disable boiler freeze protection and result in property damage.

Natural gas at high elevation might contain less heating value than the typical 1,000 BTU/cu ft and therefore can cause an improper air / gas mixture leading to improper combustion. For natural gas installations above 3,000 ft, call your gas provider to determine the heating value of the supplied natural gas. This boiler is designed to operate at its maximum listed capacity in installations located at 0 - 2000 ft above Sea Level. Since the density of air decreases as elevation increases, maximum speci ed capacity should be de-rated for elevations above 2000 ft (610 m) in accordance with the table below.

H. Water Temperature Adjustment and Scalding

This boiler can deliver scalding water. Be careful whenever using hot water to avoid scalding injury. Certain appliances such as dishwashers and automatic clothes washers may require increased water temperatures. By setting the thermostat on this boiler to obtain the increased water temperature required by these appliances you may create the potential for scald injury. To protect against injury, install a mixing valve in the water system. This valve will reduce point of use discharge temperatures by mixing cold and hot water in branch supply lines. Such valves are available from your local plumbing supplier. Table 3 details the relationship of water

Elevations 2001 ft (610 m)

3000 ft (914 m)

4000 ft (1219 m)

4500 ft (1372 m)

5000 ft (1524 m)

In Canada 1 , de-rate by: In USA 2 , de-rate by:

10%

10% 10% 10% may vary

-

12%

16%

18% 20%

NOTES: 1 Canada: Elevations between 2000 - 4500 ft (610 - 1372 m), de-rate by 10%. Consult local authorities for de-rating for elevations above 4500 ft (1372 m). 2 USA: If elevation is above 2000 ft (610 m), de-rate capacity by 4% for every 1000 ft (305 m).

Table 4 - De-Rate % for High Elevations

WARNING

Combustion - At elevations above 2000 ft, the combustion of the boiler must be checked with a calibrated combustion analyzer to ensure safe and reliable operation. It is the Installer’s responsibility to check and adjust the combustion in accordance with this manual. Failure to follow these instructions may result in property damage, serious personal injury, or death.

temperature and time with regard to scald injury and may be used as a guide in determining the safest water temperature for your applications.

Approximate Time / Temperature Relationships in Scalds

120 o F

More than 5 minutes

125 o F

1 1/2 to 2 minutes

130 o F

About 30 seconds

135 o F

About 10 seconds

140 o F

Less than 5 seconds

145 o F

Less than 3 seconds

150 o F

About 1 1/2 seconds

155 o F

About 1 second

Table 3 - Time and Temperature Relationship in Scalds

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