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Honeywell TRADELINE T8090A User Manual

Heating, cooling, and heating-cooling thermostat, wallplate and subbase
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TRADELINE
and Heating-Cooling Thermostat,
Check thermostat and subbase (if used) suitability for
the heating, cooling, or heating/cooling system. Refer to
Table 1.
Assemble tools required: flat bladed screwdriver, hand
or power drill with 3/16 in. drill bit, wire cutter/stripper or
sharp knife, bubble level or plumb bob and line.
TABLE 1—SYSTEM COMPATIBILITY FOR NON-BATTERY POWERED THERMOSTATS.
Type of Heating System to be Controlled
Electric (Line Voltage)—Typical baseboard and
radiant
Fan Coil Unit
Gas—Direct Spark Ignition (DSI), Intermittent
Pilot (IP), and Standing Pilot (SP)
Heat Pump
Hot Water Zone
Oil
Vent Damper
Warm Air Zone
a
If thermostat is not compatible with the system being controlled, the system will not operate. No hazard exists. The thermostat
will not be damaged unless it is used to directly control a line voltage system. For proper system operation, a Honeywell R841
or R8239D1015 Isolating Relay must be added to the thermostat control circuit.
b
Cut the two black heat anticipator jumper wires before installing the thermostat. See Set Heat Anticipator section.
c
Consult manufacturer for installation requirements.
T8090A Heating, Cooling,
®
Preparation
D.F. • Rev. 10-94 •
Wallplate and Subbase
Assure power is off to the heating, cooling, or heating/
cooling system at the main fuse panel. Most buildings have
a separate switch box or circuit breaker for disconnecting
power to the heating and cooling (if applicable) equipment.
This thermostat is compatible with all heating, cooling or
heating/cooling systems when thermostat is powered by
batteries. If thermostat is not powered by batteries, refer to
Table 1 for thermostat and system compatibility information.
Conditions/Compatibility
• The R8239D1015 Isolating Relay or R841 Silent
Switching Center must be installed in the thermostat
control circuit.
a,b
• Compatible. Assure correct subbase identity selected for
fan control.
b
• Compatible. If not using battery backup, assure that the
24V control transformer common is accessible for
connection to thermostat cable conductor and power to
the transformer is not regularly interrupted by high
temperature or limit operation.
• Compatible. Assure correct subbase identity is selected
for fan control and changeover control (O terminal for
cool and B terminal for heat).
• Honeywell 2-wire valves are compatible.
• Some non-Honeywell 2-wire valves will require an
R8239D1015 Isolating Relay in the thermostat control
circuit.
a,b
• Some 3-wire valves will require an R8239A1052
Isolating Relay in the thermostat control circuit.
• If not using battery backup, assure that the 24V control
transformer common is accessible for connection to
thermostat cable conductor and power to the transformer
is not regularly interrupted by high temperature, purge
cycle, or limit operation.
• Honeywell damper motors are compatible.
• Some non-Honeywell damper motors will require an
R8239D1015 Isolating Relay in the thermostat control
circuit.
a
Check control amperage requirement.
• Most are compatible.
1
• ©Honeywell Inc. 1994 • Form Number 69-0750—1
M3375
b
c
b
b
b
b
a,c,b
c
69-0750—1

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  Summary of Contents for Honeywell TRADELINE T8090A

  • Page 1 If thermostat is not compatible with the system being controlled, the system will not operate. No hazard exists. The thermostat will not be damaged unless it is used to directly control a line voltage system. For proper system operation, a Honeywell R841 or R8239D1015 Isolating Relay must be added to the thermostat control circuit.
  • Page 2: Recycling Notice

    If you have questions, call Honeywell Inc. at 1-800- 468-1502. WHEN INSTALLING THIS PRODUCT… 1. Read these instructions carefully. Failure to follow them could damage the product or cause a hazardous condition.
  • Page 3 Fig. 2—Mounting wallplate or subbase to wall. 3 SCREW HOLES WITH PLASTIC ANCHORS AUTO HEAT HEATING/COOLING SUBBASE Fig. 3—Leveling methods for wallplate or subbase. Fig. 4—Mounting wallplate or subbase on horizontal outlet box. EXISTING HORIZONTAL OUTLET BOX AUTO HEAT COOL M1552A PLUMB LINE...
  • Page 4: Mount The Thermostat

    CONNECTION STRIP 7/16 in. [11 mm] MOUNT THE THERMOSTAT Note the tabs on the top inside edge of the thermostat base. These tabs fit the slots molded into the top of the wallplate or subbase. Hang thermostat base on wallplate or subbase.
  • Page 5: Set Clock

    SET HEAT ANTICIPATOR If T8090 is used on a steam system, skip to Attach Thermostat Cover section. When used on any other heating system, cut the two black heat anticipator jumper wires. See Fig. 9. Follow the remaining section steps.
  • Page 6 Fig. 11—Attach cover. M1519 SET TEMPERATURE CONTROL LEVERS The two levers on top of the thermostat control the low and high temperatures for energy savings and comfort control. See Fig. 12. The lever on the left (blue mark) controls the lower temperature. The lever on the right (red mark) controls the higher temperature.
  • Page 7: Heating/Cooling System

    1. Remove the thermostat cover by pulling up from the bottom of cover until it clears the mounting slots. 2. Set the thermostat cover on a table near an accurate thermometer. 3. Allow five minutes for cover thermometer to sense area temperature;...
  • Page 8: Typical Wiring Diagrams

    ANTICIPATOR SCALEPLATE Typical Wiring Diagrams Fig. 15—Typical hookup for clock powered by separate 24 Vac transformer. CLOCK BATTERY THERMOSTAT SUBBASE (HOT) (HOT) POWER SUPPLY. PROVIDE DISCONNECT MEANS AND OVERLOAD PROTECTION AS REQUIRED. BATTERY BACKUP MAY BE USED IF POWER TO CLOCK IF INTERRUPTED.
  • Page 9 Fig. 19—Typical hookup for clock powered through control system. Clock powered by battery when heating or cooling equipment is on; clock takes power from system when cooling equipment is off. SUBBASE Fig. 20—Internal schematic and typical hookup for T8090A Thermostat/191108AJ Wallplate in heating- only system. CLOCK...
  • Page 10 Automation and Control Solutions Honeywell International Inc. Honeywell Limited—Honeywell Limitée 1985 Douglas Drive North 35 Dynamic Drive Golden Valley, MN 55422 Scarborough, Ontario M1V 4Z9 69-0750—1...