Cooling Only; Cooling And Heating (Heat Pump); Manual Change-Over; Programmable Electronic Thermostats - York SINGLE PHASE User's Information Manual

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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 2-stages of cooling and 2-
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 will run intermit-
tently as required for either heating or cooling. This position will provide
the lowest operating cost. If you purchased one of our thermostats, they
have an Intelligent fan mode which continually circulates the air during
occupied 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 will not shut off. However, the cooling (AC) or heat-
ing (heat pump) systems will 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 build-
ing. 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 oper-
ation.

START-UP

The maximum and minimum conditions for operation must be observed
to assure a system that will give maximum performance with minimum
service.
2
TABLE 1: Application Limitations
Air Temperature at
Outdoor Coil, °F
Min. Max.
DB DB DB DB
Cool Heat Cool Heat
60 -10 115 75
1.
Operation below this temperature is permissible for a short period of
time, during morning warm-up.
The comfort control switch is assumed to be in the "OFF" position. If the
main power supply to the outdoor and indoor units is off, turn the appro-
priate disconnects to the "ON" position. Place the system into operation
as follows.
1. Set temperature adjustment to the desired temperature on your
thermostat.
COOLING - The higher the setting, the lower the amount of energy con-
sumed. Federal Guidelines recommend a setting of 78 °F.
HEATING - The lower the setting, the lower the amount of energy con-
sumed. Federal guidelines recommend a setting of 65 °F or lower.
If your cooling and heating temperature adjustments are separate, be
sure to set both.
2. After considering "Fan Operation Selection" above, select and set
the fan operation mode you desire.
3. Move the comfort control switch to the desired mode of operation
(Cooling or Heating) found on your particular thermostat.

POWER FAILURE

When accidents, wind storms, etc. disrupt electrical power supply to
your house, switch thermostat to "OFF" position.
SYSTEM OPERATION

MANUAL CHANGE-OVER 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 adjust-
ment setting, the system will start. The outdoor unit will operate and the
indoor fan will circulate the cooled, filtered air. When the room tempera-
ture is lowered 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 indi-
cated by the temperature adjustment setting, the system will start. The
heating system will operate and the indoor fan will circulate the filtered
air. When the room temperature rises to the setting selected, the sys-
tem will shut off. Whether heating or cooling, the fan will continue to
operate if the fan switch was set in the "ON or Intelligent" 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 func-
tion automatically to operate the system as follows: When the indoor
temperature rises above the higher (COOL) setting, the outdoor unit will
operate and the indoor fan will circulate the cooled, filtered air. When
the room temperature is lowered to the selected level, the system will
shut off. The indoor fan will either shut off or run continuously, depend-
ing upon your choice of fan switch setting. When the indoor tempera-
ture drops below the lower (HEAT) setting, the heating system will
operate, and the indoor fan will circulate the heated, filtered air. When
Air Temperature at
Indoor Coil, °F
Min. Max.
WB DB WB
Cool Heat Cool
1
57 72
50
Johnson Controls Unitary Products
DB
Heat
80