X-XX UL
INSTALLATION INSTRUCTIONS
Electronic
Heat Pump Thermostat
TAYST AT 575
APPLICATION
The TAYSTAT 575 Electronic Heat Pump Thermostat provides electronic control of 24 Vac, two speed or two compressor heat pump systems with auxiliary heat. The TAYSTAT 575 can be configured to operate a single compressor
heat pump system. Refer to Table 1 for a general description of the thermostat. All TAYSTAT 575 Thermostats require
a common wire to supply power.
Table 1. TAYSTAT 575 Thermostat Description.
MERCURY NOTICE
If this control is replacing a control that contains
mercury in a sealed tube, do not place your old
control in the trash. Dispose of properly.
Contact your local waste management authority for
instructions regarding recycling and the proper
disposal of the old control.
INSTALLATION
When Installing this Product...
1. Read these instructions carefully. Failure to follow
the instructions can damage the product or cause a
hazardous condition.
2. Check the ratings given in the instructions and on
the product to make sure the product is suitable for
your application.
3. Installer must be a trained, experienced service
technician.
4. After completing installation, use these instructions
to check out the product operation.
CAUTION
Electrical Shock or Equipment Damage Hazard.
Can shock individuals or short
equipment circuitry.
Disconnect power supply before installation.
Location
Install the thermostat about 5 ft (1.5m) above the floor in
an area with good air circulation at average temperature.
See Fig. 1.
Do not install the thermostat where it can be affected by:
— drafts, or dead spots behind doors and in corners.
— hot or cold air from ducts.
— radiant heat from sun or appliances.
— concealed pipes and chimneys.
— unheated (uncooled) areas such as an outside wall
behind the thermostat.
®U.S. Registered Trademark. • • All Rights Reserved
Pub. No. 11-HD28D2-1
69-1591-1
TAYSTAT Changeover
System Selection
Fan
Selection Comments
575 Automatic Em. Ht. – Heat-Off-Auto-Cool On-Auto Down-selectalbe for single compressor
systems.
69-1591–1
2
ELECTRONIC HEAT PUMP THERMOSTAT
Pub. No. 11-HD28D2-1
Fig. 1. Typical location of thermostat.
5 FEET
[1.5 METERS]
YES
NO
NO
NO
M10106
Fig. 2. Mounting the wallplate.
WIRES
THROUGH WALL
WALL
MOUNTING
HOLES
MOUNTING
SCREWS
M6530
WALL
ANCHORS
(2)
Wallplate Installation
Mount tthermostat horizontally on the wall or on a 2 in. x 4
in. wiring box.
1. Position and level the wallplate (for appearance
only). The thermostat functions properly even when
not level.
2. Use a pencil to mark the mounting holes. See
Fig. 2.
3. Remove the wallplate from the wall and drill two
3/16 inch holes in the wall (if drywall) as marked. For
firmer material such as plaster or wood, drill two
7/32 inch holes. Gently tap anchors (provided) into
the drilled holes until flush with the wall.
4. Position the wallplate over the holes, pulling wires
through the wiring opening.
5. Loosely insert the mounting screws into the holes.
6. Tighten mounting screws.
69-1591–1
3
ELECTRONIC HEAT PUMP THERMOSTAT
Pub. No. 11-HD28D2-1
Fig. 4. Correct wiring technique.
Mounting Thermostat
1. Engage tabs at the top of the thermostat and
wallplate. See Fig. 5.
2. Press lower edge of case to close and latch.
M4826
FOR WRAPAROUND
INSERTION STRIP
7/16 IN. (11 MM).
FOR STRAIGHT
INSERTION STRIP
5/16 IN. (8 MM).
WIRING
All wiring must comply with local electrical codes and
ordinances. Refer to Fig. 3 for typical hookup. A letter code
is located near each terminal for identification.
COMPRESSOR
CONTACTOR 2
M20273A
W
L1
L2
FAN
SWITCHOVER
VALVE
Y1 Y2
X2
THERMOSTAT
B RO
COMPRESSOR
CONTACTOR 1
EM. HT.
RELAY
TRANSFORMER
OT OT
OUTDOOR
TEMPERATURE
SENSOR
TAYSENS100A
G
F
DEFROST
CONTROLLER
1
1
2
POWER SUPPLY. PROVIDE DISCONNECT MEANS AND OVERLOAD
PROTECTION AS REQUIRED.
2
FEATURE NOT AVAILABLE ON ALL SYSTEMS.
3
USE OUTDOOR TEMPERATURE SENSOR TAYSENS200A AND CONFIGURE
INSTALLER SETUP NUMBERS 24 TO 1.
3
AUX.
HEAT
RELAY
BLUE
YELLOW
BROWN
GREEN
ORANGE
BLACK
WHITE
RED
Fig. 3. Typical hookup in heat pump system with emergency heat relay.
CAUTION
Electrical Shock or Equipment Damage Hazard.
Can shock individuals or short equipment
circuitry.
Disconnect power supply before installation.
1. Loosen the terminal screws on the wallplate and
connect the system wires. See Fig. 4.
IMPORTANT
Use 18 gauge, color-coded thermostat cable for
proper wiring.
2. Securely tighten each terminal screw.
3. Push excess wire back into the hole.
4. Plug the hole with nonflammable insulation to
prevent drafts from affecting the thermostat.
Fig. 5. Mounting thermostat on wallplate.
NOTE: To remove the thermostat from the wall, first
pull out at the bottom of the thermostat; then
remove top.
M6798
A
B.
PRESS LOWER EDGE OF CASE TO LATCH.
A.
ENGAGE TABS AT TOP OF THERMOSTAT AND WALLPLATE
.
69-1591–1
4
ELECTRONIC HEAT PUMP THERMOSTAT
Pub. No. 11-HD28D2-1
Using Thermostat Keys
Use thermostat keys to:
• Set temperature,
• Display present setting,
• Configure Installer Setup,
• Check System-Test,
• Display outdoor temperature (select models).
• Set system operation,
• Set fan operation.
See Fig. 6 for the key information.
Fig. 7. ASYSTAT 575 (automatic changeover)
System and Fan key locations.
NOTE: Always press the system and fan keys with your
fingertip or similar blunt tool. Sharp instruments
like a pen or pencil point can damage the
keyboard.
Emergency Heat
The Emergency Heat feature allows you to turn on the
electric heat section of the system by moving the
System switch to the Em. Ht. position. The LED lights
(see Fig. 7) when the thermostat is moved to the
Em. Ht. position or when the system goes into defrost.
The thermosat displays Em. Ht. when the system calls
for emergency heat.
LED indication
One LED indicator is located on the lower right bottom
of the thermostat. It indicates when a CHECK signal is
sent to the thermostat from the system. See Fig. 7.
Temperature Settings
The default setpoint for heat is 70°F (21°C) and for cool is
78°F (25.5°C). Press the increase ▲ or decrease ▼ key to
change the present setting. To change between heat and
cool, press the Information i key until the setting to be
changed appears.
Cooling Droop
Cooling system operation or cycling below the setpoint
temperature is called “Cooling Droop”. Thermostats that
provide this operation improve the comfort during
extended off periods by providing air circulation to
prevent stagnation and improved moisture removal due
to increased run time. Cooling Droop is most effective in
mild weather conditions and during nighttime operation
(low load). The effect of Cooling Droop on indoor
temperature operation typically lowers the indoor
temperature by up to one or two degrees. If the cooling
droop is not desired, it can be disabled.
Comfort R™
Comfort R helps achieve comfort with a lower humidity
level. When enabled (selected in installer setup) the
thermostat calculates a fan delay on a call for cool. The
calculated delay maximizes dehumidification and
comfort from the air conditioning system.
M10147C
i
Press to select
heating or cooling
equipment.
Em. Ht.
-Emergency heating
Heat—Heating equipment
Off — No equipment
Cool—Cooling equipment
Auto—Thermostat
automatically selects
heating and cooling
equipment.
Press to select
heating or cooling
equipment.
On— Fan runs continuously
Auto—Fan runs when
heating or cooling
equipment operates
System
System
System
Fan
Fan
Fan
TWO LED INDICATORS ON MOST MODELS.
1
1
M680
1
DISPLAY PRESENT
SETTINGS AND SCROLL
THROUGH INSTALLER
SETUP MODES
(INFORMATION KEY)
i
DECREASE
TEMPERATURE
SETTING
INCREASE
TEMPERATURE
SETTING
Fig. 6. Thermostat key locations and descriptions.
SETTINGS
System and Fan Settings
System settings control the thermostat operation as
follows:
Em. Heat: The thermostat cycles the Emergency Heat
relay and the highest heat stage. The cooling
system is off. The compressor is de-energized.
Heat: The thermostat controls the heating.
Off: Both the heating and cooling are off.
Cool: The thermostat controls the cooling.
Auto: The thermostat automatically changes between
heating and cooling operation, depending on the
indoor temperature.
Fan settings control the system fan as follows:
On: Fan operates continuously.
Auto: Equipment controls fan.
The system default setting is Heat and the fan default
setting is Auto. Use the keyboard to change to the desired
settings. See Fig. 7.
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