66235-BUM-C-0313
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Johnson Controls Unitary Products
THERMOSTATS - Your Key
to Comfort
Though thermostats may vary widely
in appearance, all are designed to
perform the same basic function - to
control the operation of your air
conditioning system.
Regardless of size or shape, each
thermostat will feature a temperature
indicator; a dial, arm or push button
for selection of the desired
temperature; a fan switch to choose
the indoor fan operation; and a
comfort switch for you to select the
system mode of operation.
The following illustrations and
discussion will aid you to determine
which type of thermostat you have
for your system. Follow the
applicable instructions in this manual
to obtain the maximum comfort with
a minimum of energy consumption.
COOLING ONLY
If your air conditioning system is
designed to provide only cooling,
with no capability for heating
operation, a cooling only thermostat,
with a manual, two-position “Cool”
and “Off” comfort switch is all that is
required for system operation.
Cooling and Heating
If your system has been designed to
allow both cooling and heating
operation, you may have either of
two types of thermostat. A manual
change-over type, or a computerized
electronic thermostats.
Manual Changeover
Manual changeover simply means
that the comfort switch must be
manually positioned every time you
wish to switch from the cooling to
heating or heating to cooling models
of operation.
Computerized Electronic Thermostat
The computerized electronic
thermostat is actually a sophisticated
electronic version of a manual
change-over type. This thermostat
includes features which allow “set-
back” temperature variations for
periods of sleep, or while you are
away during the day, and means
energy saving for you.
The thermostat also features a digital
clock. If you have selected this type
of thermostat, a complete operating
instruction is provided by the
manufacturer with the thermostat.
Fan Operation Selection
A two-position fan switch allows you
to choose the type of operation of the
indoor fan.
AUTO
With the thermostat fan switch set to
“AUTO”, the fan will run intermittently
as required for either heating or
cooling. This position will provide the
lowest operating cost, and better
humidity control on cooling
operation.
ON
CONTINUOUS FAN OPERATION:
With the thermostat fan switch set to
“ON”, the indoor fan will not shut-off.
However, the cooling and heating
systems will still operate as required
by room temperatures. This provides
continuous air filtering and more
even temperature distribution to all
conditioned spaces. The sound level
within the building will also remain
relatively constant.
FAN ONLY OPERATION:
On moderate days, usually during
spring and fall, when neither heating
nor cooling is required, you may
want to run only the fan to ventilate,
circulate and filter the air in your
home or building.
Set the comfort control switch to
“OFF” and the fan switch to “ON”. Be
sure to return the switches to their
original positions for normal
operation.
START-UP
The comfort control switch is
assumed to be in the “OFF” position.
If the main power supply to the unit is
off, turn the appropriate disconnect
switch to the “ON” position.
If a warning label is attached to the
disconnect switch, as shown below,
and if the power supply has been off
for 8 hours or longer, the disconnect
switch must be turned on 8 hours
before the thermostat is set to
operate the compressor.
IMPORTANT
IF POWER HAS BEEN OFF
FOR 8 HOURS OR LONGER,
DISCONNECT SWITCH
MUST BE TURNED ON 8
HOURS BEFORE THERMO-
STAT IS SET TO “HEAT”,
“COOL” OR “AUTO”.
035-03095A
C
ongratulations . . .
On your purchase of one of our Single Package Air Conditioning Units. This energy efficient system has been precision
designed, manufactured of high quality materials and has passed many vigorous inspections and tests to ensure years of satis-
factory service.
This manual is meant to increase your understanding of your system, tells you how to operate it efficiently and how to obtain
the greatest measure of comfort at the lowest operating expense. Please read this manual thoroughly.
We appreciate your interest in our products and your decision to purchase our Single Package Unit. Enjoy your comfort.
