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APPLICATION
The TAYSTAT 375 Multistage Electronic Thermostat provides electronic control of 24 Vac two-stage heating and two-
stage cooling systems. Refer to Table 1 for a general description of the thermostat. The thermostat requires a common
wire to supply power.
TAYSTAT
System
375
Heat-Cool
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.
®U.S. Registered Trademark •
Table 1. Thermostat Description.
System
Changeover
Selection
Automatic
Heat-Off-Cool-Auto
• All Rights Reserved
Electronic Thermostat
INSTALLATION INSTRUCTIONS
Fan
Selection
On-Auto
Use keyboard to make system and fan
selections.
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.
Wallplate Installation
Mount the thermostat 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.
X-XX UL
Multistage
TAYSTAT 375
Comments
Pub. No. 18-HD28D1-1
69-1592-1
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Summary of Contents for Trane TAYSTAT 375
- Page 1 INSTALLATION INSTRUCTIONS APPLICATION The TAYSTAT 375 Multistage Electronic Thermostat provides electronic control of 24 Vac two-stage heating and two- stage cooling systems. Refer to Table 1 for a general description of the thermostat. The thermostat requires a common wire to supply power.
- Page 2 MULTISTAGE ELECTRONIC THERMOSTAT 5 FEET [1.5 METERS] M10106 Fig. 1. Typical location of thermostat. 4. Position the wallplate over the holes, pulling the wires through the wiring opening. WALL 5. Loosely insert the mounting screws into the holes. 6. Tighten the mounting screws. WIRES THROUGH WALL WIRING...
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Page 3: Mounting Thermostat
TRANSFORMER POWER SUPPLY. PROVIDE DISCONNECT MEANS AND OVERLOAD PROTECTION AS REQUIRED. M20272 Fig. 3. Typical hookup of TAYSTAT 375 in a multistage heating and cooling system. M14278 Fig. 5. Mounting thermostat on wallplate. NOTE: To remove the thermostat from the wall, first pull out at the bottom of the thermostat;... -
Page 4: Temperature Settings
(approximately three seconds). The display scrolls the numbers backward to the normal display. The Installer Setup is automatically exited if no key Fig. 7. TAYSTAT 375 System and Fan keys. presses are made for five minutes. IMPORTANT NOTE: Always press the System and Fan keys with Only configurable numbers are shown on the your fingertip or similar blunt tool. - Page 5 MULTISTAGE ELECTRONIC THERMOSTAT Table 2. Thermostat Installer Setup Options. Other Choices Installer (Press ▲ or ▼ key to change) Factory-Setting Setup Number Select Display Description Display Description Fan operation Coventional application Application where thermostat where equipment controls fan operation in heat controls fan operation in mode heat mode...
- Page 6 MULTISTAGE ELECTRONIC THERMOSTAT Table 2. Thermostat Installer Setup Options (Continued). Other Choices Installer (Press ▲ or ▼ key to change) Factory-Setting Setup Number Select Display Description Display Description Minimum deadband Heating and cooling 03 thru Heating and cooling between heating and setpoints can be set no setpoints can be set no cooling in auto...
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Page 7: Installer System Test
MULTISTAGE ELECTRONIC THERMOSTAT INSTALLER SYSTEM TEST CAUTION Equipment Damage Hazard. Use the Installer System Test to check the thermostat Minimum compressor off-time is bypassed configurations and operation. Refer to Table 3 for a list of during the Installer System Test. the system tests. -
Page 8: Thermostat Information
MULTISTAGE ELECTRONIC THERMOSTAT 3. Press the increase ▲ key again to display the To start the system test: 1. Press and hold the increase ▲ and decrease ▼ software identification code (Example: 02 = keys, at the same time, until two zeros appear. (All software ID code 2). -
Page 9: Troubleshooting Guide
MULTISTAGE ELECTRONIC THERMOSTAT TROUBLESHOOTING GUIDE Symptom Possible Cause Action Display does not Thermostat is not being • Check that B terminal is connected to the system come on. powered. transformer. • Check for 24 Vac between B and R terminals. —... - Page 10 MULTISTAGE ELECTRONIC THERMOSTAT TROUBLESHOOTING GUIDE (continued) Symptom Possible Cause Action Cooling will not No power to the thermostat. • Check that B terminal is connected to the system come on. transformer. • Check for 24 Vac between B and R or R and Y terminals. —...
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Page 12: Customer Assistance
CUSTOMER ASSISTANCE If, after reading this guide, you have any questions concerning the operation of your thermostat, please call the Thermostat Customer Assistance Helpline at 1-877-880-3381. For service, contact your local heating and cooling contractor. American Standard Inc. Troup Highway Pub.
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