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Service Reference Manual INSTALLATION
6-15
SRM-HW/HWC 8/99
Installation and Operation in Extremely Cold
Weather Areas
In areas where extremely cold (below – 20°F) outdoor temperatures can
be expected, some additional installation and operating precautions
should be taken. The following precautions are taken to prevent possible
vent system ice blockage that could result in safety shutdown of the
burners:
1. Adjust to the highest achievable temperature rise within the rise and
static pressure ranges specified on the rating plate. Depending on
specific model, it may be possible to change to a lower heating blower
speed tap to get a higher temperature rise. This also increases
comfort.
2. Make sure there are no leaks of outside air into the return air system.
3. Keep the outside louver grille as free as possible of any ice that may
form and obstruct the flue outlet.