66235-BUM-C-0313
Johnson Controls Unitary Products
3
Please the system into operation as
follows:
1. Set temperature adjustment to
the desired temperature.
COOLING - The higher the set-
ting, the lower the amount of
energy consumed. The National
Bureau of Standard recom-
mends a setting of 78F.
HEATING - The lower the set-
ting, the lower the amount of
energy consumed. Federal
guidelines recommend a setting
of 65F or lower.
2. After considering “Fan Operation
Selection” on page 2, select and
set the fan operation mode you
desire.
3. Move the comfort control switch
to the desired mode of operation
found on your particular thermo-
stat.
SYSTEM OPERATION
Manual Changeover Thermostat
COOLING YOUR HOME-With the
comfort control switch in the “COOL”
position, the system will operate as
follows:
When the indoor temperature
rises above the level indicated
by the temperature adjustment
setting, the system will start.
The outdoor unit will operate
and the indoor fan will circulate
the cooled, filtered air. When
the room temperature is low-
ered to the setting selected,
the system will shut off.
HEATING YOUR HOME-If your
system includes a heating unit and
the comfort control switch is in the
“HEAT” position, the system will
operate as follows:
When the indoor temperature
drops below the level indicated
by the temperature adjustment
setting, the system will start.
The heating system will oper-
ate and the indoor fan will cir-
culate the heated, filtered air.
When the room temperature
rises to the setting selected,
the system will shutoff.
Whether heating or cooling, the fan
will continue to operate if the fan
switch was set in the “ON”
position.The “AUTO” setting on the
fan switch will allow the fan to shut
off when your system does.
Electronic Thermostat
The computerized electronic
thermostat, when programmed, will
function automatically to operate the
system as follows:
When the indoor temperature rises
above the higher (COOL) setting, the
unit will operate and the indoor fan
will circulate the cooled, filtered air.
When the temperature is lowered to
the selected level, the system will
shut off. The indoor fan will either
shut off or run continuously,
depending upon your choice of fan
switch setting.
When the indoor temperature drops
below the lower (HEAT) setting, the
heating system will operate, and the
indoor fan will circulate the heated,
filtered air. When the indoor
temperature rises to the selected
setting, the system will shut off.
MAINTENANCE
LUBRICATION
Both the indoor blower motor and
outdoor fan motor are permanently
lubricated and requires no
maintenance.
FILTER CARE
Single phase units are shipped
without a filter and is the
responsibility of the installer to
secure a filter in the return air
ductwork or install a filter/frame kit
(6MC54). A filter rack and filters are
standard on three phase units.
Filters must always be used and
must be kept clean. When filters
become dirt laden, insufficient air will
be delivered by the blower,
decreasing your units efficiency and
increasing operating costs and wear-
and-tear on the unit and controls.
Filters should be checked monthly
especially since the unit may be
used for both heating and cooling.
High velocity permanent filters may
be removed for cleaning. Remove
filters, vacuum or wash with a stream
of water directly from a faucet or
hose. Allow filters to dry and replace.
High velocity permanent filters
should last for many years. However,
if they ever need replacing, they
must be replaced with the same size
and type.
REGISTERS
Supply and return air registers must
be open when the unit is in
operation. Furniture must not block
airflow in or out of the registers.
COIL CARE
An annual check and cleaning, if
necessary, of the condenser coil
should be done. Clean any debris
and dirt from the outside coil face
with a brush being careful not to
damage the fins. If extremely dirty, a
hose can be used to wash the coil
from the inside out while brushing a
soapy solution on the outside.
NOTE: If your cooling and
heating temperature adjust-
ments are separate, be sure to
set both.
NOTE: The thermostat has a
built-in off-cycle timer to pre-
vent the unit from operating
until the system pressures
have equalized.
CAUTION: Prior to any of the
following maintenance proce-
dures, shut off all power to the
unit.
