Water Temperature Adjustment And Scalding; High Elevation Installations - NTI FTVN085 Installation Start-Up Maintenance

CAUTION
On FTVN085 / FTVN110 / FTVN150 / FTVN199 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.
NOTICE
The use of glycol may reduce the usable BTU output of the boiler,
requiring the unit to be "down-fired" by limiting the maximum
operating capacity and/or water temperature. For applications
requiring glycol concentrations greater than 30%, such as snow
melt systems, it is recommended to use a brazed plate heat
exchanger to separate the glycol mixture from the boiler water. See
below.
Figure 1 - Snow Melt Application
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 temperature and time with
regard to scald injury and may be used as a guide in determining the
safest water temperature for your applications.
DANGER
An ASSE 1017 or ASSE 1070 temperature limiting or mixing valve
is required in all combi boiler installations. Failure to install a
temperature limiting or mixing valve will result in property damage,
severe personal injury, or death due to scalds.
Part 1 - General Safety Information
Approximate Time / Temperature Relationships in Scalds
120 o F
125 o F
o
130 F
135 o F
140 o F
145 o F
150 o F
155 o F
Table 3 - Time and Temperature Relationship in Scalds
I. High Elevation Installations
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 specified capacity
should be de-rated for elevations above 2000 ft (610 m) in accordance
with the table below.
2001 ft 3000 ft
Elevations
(610 m) (914 m)
1
In Canada ,
10%
de-rate by:
2
In USA ,
-
de-rate by:
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.
More than 5 minutes
1 1/2 to 2 minutes
About 30 seconds
About 10 seconds
Less than 5 seconds
Less than 3 seconds
About 1 1/2 seconds
About 1 second
4000 ft 4500 ft
(1219 m) (1372 m)
10% 10% 10%
12% 16% 18%
5000 ft
(1524 m)
may vary
20%
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