Evening star., 1934-12-15

presurestat in the steam system
turns on the blower. supplying heat
to the house. When the thermostat Is
satisfled It shuts on the fuel burner,
the aquastat or pressurestat holding
or pressure drops below the proper
point.
This system Of control may sound
rather complicated, but in actual
operation the machines work without
any noise or bother. The owners
have to adjust only the therrnostat
when change Of temperature Is de-
sired. Many installations are equipped
with clock thermostats that remove
the necessity Of adjustment Of any
sort.
Many people are desirous of INSTALL
ing some kind of air conditioning
equipment that can be used in con-
junction with their present heating
plants, and possibly the greatest need
u some form Of humidifying equip
ment for use with q steam or hot water
system.
There are q number of devices that
will perform this function very salts
factoriiy, among them unit humidi-
fiers for installation on the first floor,
equipped with . blower In addition to
the humidifying spray or evaporator
that will force the moist air up into
the house. These units are controlled
by . device called . humidistat that
opens and closes . water supply line,
rs desired, by means Of an electric
valve.
Portable Humidifiers.
There are also motor driven portable
humidifiers that will distribute mois-
ture In o fine spray into the air
thereby increasing the relative humid
ity as desired. In this class there are
also portable machines that will steam
on moisture either from the radiators
already installed or from small elec-
trically heated mechanisms.
While these devices are not as salts
factory As the built-in control plants,
they will provide for the humidity re-
quirements which are such an impor-
tant part Of any good air conditioning
system.
The use OF hot air for heating Is
not as widespread in Washington as
1t Is in other cities. where it consti-
tues nearly 80 per cent Of the heating
equipment, but the owners of that
type Of plant viii probably want to
know how they can convert their
present outfits into air conditioners.
There are available a number of
blowers. filter and humidifier units,
compactly built and efflciently de-
signed that will enable the owner to
bring his present system up to date.
All that is necessary is to attach the
air-conditioning unit to his present
hot-air furnace; cut q hole In the
floor and connect up a return air
duct:r earrange the sheet metal duct
work slight amount for forced air
operation and connect up the piping
and electrical controls.
Instead Of depending upon high
heat and gravity for circulation the
electric blower will pull the cold air
out of the house, filter the dirt out of
1t, wash 1t If q spray humidifier is
used, add the proper amount of
moisture, heat 1t by means of the old
hot-air heating furnace and force 1t
up into the house through the old
duct work and registers.
Although this Is rather cool weather
to discuss equipment for Summer
cooling and air conditioning, next
week the machinery available for this
stat in the hot water system or a
phase Of air conditioning will be de-
scribed.
(Mr. Tucker WilI be glad to anstDer
any questions readers may rant to
ask relatire to dir-conditionin0, heat
inc or pentilatinp.)