1183508-UUM-O-0121
2 Johnson Controls Ducted Systems
THERMOSTATS
YOUR KEY TO COMFORT
Although thermostats may vary widely in appearance, they are all
designed to perform the same basic function: to control the operation of
your air conditioning or heat pump system. Regardless of size or shape,
each thermostat features a temperature indicator; a dial, arm, or push
button for selection of the required temperature; a fan switch to choose
the indoor fan operation; and a comfort switch for you to select the sys-
tem mode of operation.
Only approved thermostats have been tested and are fully compatible
with this equipment. Please be aware that many different thermostats
operate on batteries or power stealing principals. These types of ther-
mostats cannot be supported as trouble free when used with this product.
If your system has been designed to allow both cooling and heating
operation, you may have either a manual change-over type, or a pro-
grammable electronic type thermostat.
Manual change-over 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 modes of operation.
A complete operating instruction is provided by the manufacturer for
each thermostat. Familiarize yourself with its proper operation to obtain
the maximum comfort with minimum energy consumption.
The computerized electronic thermostat is actually a sophisticated elec-
tronic 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 savings
for you. The thermostat also features a digital clock.
COOLING ONLY
If your air conditioning system is designed to provide cooling only (AC),
with no capability for heating operation (heat pump), a two-stage cool-
ing only thermostat, with a manual, one-position COOL and OFF com-
fort switch is all that is required for system operation.
COOLING AND HEATING (HEAT PUMP)
If your system has been designed to allow both cooling and heating
operation, you may have either a manual change-over type or a pro-
grammable electronic type thermostat with two stages of cooling and
two stages of heat.
MANUAL CHANGE-OVER
Manual change-over 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 modes of operation.
PROGRAMMABLE ELECTRONIC
THERMOSTATS
The computerized electronic thermostat is actually a sophisticated elec-
tronic 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 savings
for you. The thermostat also features a digital clock.
FAN OPERATION SELECTION
A multi-position fan switch allows you to choose the type of fan opera-
tion of the indoor fan.
AUTO
With the thermostat fan switch set to AUTO, the fan runs intermittently
as required for either heating or cooling. This position provides the low-
est operating cost. If you purchased one of our thermostats, they have
an Intelligent fan mode which continually circulates the air during occu-
pied modes or when you are at home, and can cycle the fan during
unoccupied mode or during the night while you sleep to further con-
serve energy.
ON
CONTINUOUS FAN OPERATION: With the thermostat fan switch set to
ON, the indoor fan does not shut off. However, the cooling (AC) or heat-
ing (heat pump) systems still operate as required by room tempera-
tures. This provides continuous air filtering and more even temperature
distribution to all conditioned spaces.
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 maximum and minimum conditions for operation must be observed
to assure a system that gives maximum performance with minimum
service.
TABLE 1:
Application Limitations
1
1.
Operation below this temperature is permissible for a short period of time during morning warm-up.
Model
Air Temperature at Outdoor Coil (°F) Air Temperature at Indoor Coil (°F)
Minimum Maximum Minimum Maximum
DB Cool DB Heat DB Cool DB Heat WB Cool DB Heat WB Cool DB Heat
1 All 13 SEER AC 55 – 115 – 57 – 72 –
3 All 13 and 17 SEER AC 55 – 125 – 57 – 72 –
All 13 SEER Horizontal AC 55 – 115 – 57 – 72 –
All 14 SEER Horizontal AC 55 – 120 – 57 – 72 –
All 14+ SEER AC and HP 55 -10 125 75 57
50
1
72 80
All Inverter AC and HP 50 -20 125 75 57 50 72 80
All 2-Stage AC
35–54
2
55
3
2.
With Crankcase Heater Kit.
3.
Without Crankcase Heater Kit.
– 125 – 57 – 72 –
All 2-Stage HP 35–54 -20 125 75 57 50 72 80
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