Evening star., 1941-08-02
Device Ends Blasts
OF Cold From Winter
Air Conditioner
Floating Drive Allows
Blower q GruduoI
Accelerution
BY LAWRENCE CROLIUS.


Are you bothered by great blasts
of cold air when the blower of your
winter conditioner starts up? In
this summer heat it is hard to re-
member what 1t Is like to be both
cred by q cold blast of anything,
but certainly few things can be
more uncomfortable than the frigid
breeze that comes out of ''hot-air"
register when the conditioner is get
ting under way. This cold air has
been standing in the ducts leading
from the basement to the rooms,
and naturally it has to be removed
before the warm air can get up.
A clever new floating drive" has
been put on the market which pre-
vents this violent chilling effect by
allowing the blower in the air con-
ditioner to come up to full speed
very gradually, rather than to start
of with bang as it ordinarily
does. The new drive can be put on
any blower of the centrifugal type
in any winter air conditioner, and
Is easily installed by an expert heat
ing man or electrician. 1t consists
of q specially designed and con-
structed pulley which fits on the
blower shaft, q combination safety
limit and fan switch which is in
serted in the top of the heating
chamber, and capillary tube con-
troll system which connects the two.
The pulley is fitted with a clutch
arrangement which allows the motor
to start up unencumbered by the
blower. Thus there is less strain on
the motor with consequent reduction
IN wear and tear, and you hear none
of the bothersome groaning which
goes on when some blower motors
start up under full load The pulley
is ftted with power adjustment
feature which enables you to set the
starting-up speed of the blower in
very precise manner. Inside the
pulley is a bellows which is con-
nected to the capillary tube that
runs up to the control switch.
Hence, when heat is called for by
the room thermostat the furnace
heats up and the blower motor is
started when furnace temperature
of lis degrees is reached. Then. as
the furnace grows hotter, the blower
control starts to function. 1t is filled
with a volatile fluid and connected
TO the other end of the capillary, so
that as the temperature goes up the
pressure in the tube is increased, the
clutch is gradually pushed in and
the blower comes up in a fine,
gradual acceleration.
In this way the blower speed is
varied directly with the need for
heat. In very cold weather it will
be operated continuously, and in
milder weather the motor stops
when the furnace temperature drops
to ITO degrees. Obviously the whole
cycle is smooth and steady, and you
hear none of the clatter and bang
Of intermittent operation.
II you are being smart and having
an oil burner installed now, while
the heating fraternity is partially
relaxed, you will be interested in q
new device which gets away from
those bsd-looking oil tank fill and
vent fittings. Not only are they
unsightly sitting there for all the
world to see and stumble over. but
they aren't exactly Inexpensive to
install.
Now you can put in a combination
oil tank fill and vent fitting which
ts placed flush in the building wall
and presents very handsome ap-
pearance. 1t consists of a metal
casting which is 2& inches wide,
So inches long and 21a inches deep.
This casting has a cadmium plated
cover which is slotted for ventilation
and is removed by means of a Spe-
cial key wrench which turns q brass
lock screw. Thus you keep the key
wrench inside and nobody can
tamper with the oil supply and vent
lines without it.
Your oil is put in through an ex-
tension to q threaded 45-degree
hitting inside the box, since various
pipe-size openings are furnished to
suit building codes in different cities.
On the back of the box is a fitting
for attaching the oil line to the
storage tank, and another opening
is provided for the vent pipe which
is held by lock nut and bushing.