10
420012001500 - 03182024 - Rev. 04
CAUTION
I. High Elevation Installations
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.
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.
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.
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.
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.
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
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:
10% 10% 10% 10%
may vary
In USA
2
,
de-rate by:
- 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).
Part 1 - General Safety Information
WARNING
WARNING
Table 3 - Time and Temperature Relationship in Scalds
Table 4 - De-Rate % for High Elevations
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