The Goderich Signal-Star, 1977-11-10, Page 48ve
heat around
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y
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s one thing to produce
efficiently, but that's
part of the battle. The
important topic is
ing it to where you want
ere are four basic types
sting systems
arm air. Air is heated and
circulated through the
e with the help of a fan or
rody
w
t water. Water is heated
pumped through pipes
radiators.
eam. Water is boiled to
uce steam which then
ulates through pipes and
ators.
Electricity. Electricity is
supplied directly to each
room in the house and sup-
plies heat through heating
elements and radiators.
Warm -air heating is the
most common system in
Canada. Cool air is drawn
from the house through the
cold -air registers. It is
filtered and a fan forces it
over the heat exchanger
where it picks up heat from
the firepot. rt then circulates
in ducts to air registers
throughout the house.
The fan usually starts after
the burner, and is controlled
by a thermostat that
measures the temperature of
the air in the heat exchanger.
You'll notice- that the fan
often keeps running after the
burner has cut out. Air is still
being heated; energy in the
furnace would be wasted if it
shut down right away. The
warm -air temperatures at
which the fan cuts in and out
are easily set by a control
switch on the front or side of
the furnace.
The serviceman usually
sets the fan to cut in at 175-200
degrees F (80-93 degrees C)
and out at 140-150 degrees F
(60-65 degrees C). This is a
high range. To extract more
energy from the furnace, set
the fan to cut in at 120 degrees
F T49 degrees C) and out at
100 degrees F (38 degrees C),
The fan will start to circulate
the hot air sooner and will run
longer after the thermostat
has cut off the burner.
For the last minute or so of
fan operation, the circulating
air may feel a little chilly to
someone sitting close to a
register. 'You want the best
setting for your needs and
may prefer the cut-out
temperature higher than 100
degrees F (38 degrees C).
Lubricate the fan motor.
Give it a squirt of oil two or
three times, during the
heating season.
Check belt tension and
alignment. There must be
proper alignment between
the pulleys of the electric
motor and the fan. Belt
tension is also important.
These items should be in.
eluded in your annual ser-
vicing, but you can check
them yourself as well. (The
diagram of the warm -air
heating system shows you the
location.)
Before you do anything,
turn off the master power
switch. Oil the motor and then
Turn to page 4 •
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