Honeywell TRADELINE T8090A User Manual download pdf

1 69-0750—1

T8090A Heating, Cooling,

and Heating-Cooling Thermostat,

Wallplate and Subbase

D.F. • Rev. 10-94 • • ©Honeywell Inc. 1994 • Form Number 69-0750—1

Preparation

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.

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.

TABLE 1—SYSTEM COMPATIBILITY FOR NON-BATTERY POWERED THERMOSTATS.

Type of Heating System to be Controlled Conditions/Compatibility

Electric (Line Voltage)—Typical baseboard and

radiant

• The R8239D1015 Isolating Relay or R841 Silent

Switching Center must be installed in the thermostat

control circuit.

a,b

Fan Coil Unit • Compatible. Assure correct subbase identity selected for

fan control.

Gas—Direct Spark Ignition (DSI), Intermittent

Pilot (IP), and Standing Pilot (SP)

• 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.

Heat Pump • Compatible. Assure correct subbase identity is selected

for fan control and changeover control (O terminal for

cool and B terminal for heat).

Hot Water Zone • 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.

a,c,b

Oil • 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.

Vent Damper • Honeywell damper motors are compatible.

• Some non-Honeywell damper motors will require an

R8239D1015 Isolating Relay in the thermostat control

circuit.

Check control amperage requirement.

Warm Air Zone • Most are compatible.

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.

Cut the two black heat anticipator jumper wires before installing the thermostat. See Set Heat Anticipator section.

Consult manufacturer for installation requirements.

TRADELINE

M3375

1 2 3 4 5 6 7 8 9 10

Summary of Contents

Page 1 - Wallplate and Subbase

1 69-0750—1T8090A Heating, Cooling,and Heating-Cooling Thermostat,Wallplate and SubbaseD.F. • Rev. 10-94 • • ©Honeywell Inc. 1994 •

Page 2 - Installation

69-0750—1 10Automation and Control SolutionsHoneywell International Inc. Honeywell Limited—Honeywell Limitée1985 Douglas Drive North 35 Dynamic DriveG

Page 3 - 3 69-0750—1

69-0750—1 2M3375Recycling NoticeThis control contains mercury in a sealed tube. Do notplace control in the trash at the end of its useful life.If this

Page 4 - Fig. 6—Thermostat mounting

3 69-0750—1Fig. 2—Mounting wallplate or subbase to wall.Fig. 3—Leveling methodsfor wallplate or subbase.Fig. 4—Mounting wallplate or subbase on horizo

Page 5 - Fig. 8—Set clock

69-0750—1 4WIRINGFollow the instructions provided by the heating, coolingor heating-cooling equipment manufacturer. If not avail-able, refer to the Ty

Page 6 - Checkout

5 69-0750—1Adjust the heat anticipator lever to match the currentrating of the primary control for the proper cycle rate(Fig. 9). Set adjustable antic

Page 7 - Calibration

69-0750—1 6Remove the thermostat from the wallplate or subbase.Connect an ac ammeter of appropriate range (about 0A to2A) between the R and W terminal

Page 8 - Typical Wiring Diagrams

7 69-0750—1THERMOSTATThis thermostat was calibrated at the factory and shouldnot need recalibration in the field. If recalibration seemsnecessary, fir

Page 9 - 9 69-0750—1

69-0750—1 8Fig. 14—Use of 104994A calibration wrench..35.30.25.20.10M8583ANTICIPATORSETTING LEVERANTICIPATOR SCALEPLATECALIBRATIONWRENCHTypical Wiring

Page 10 - 69-0750—1 10

9 69-0750—1L1 (HOT)L211L1 (HOT)L21HEATRELAYCOMPRESSORCONTACTORCLOCKPOWER SUPPLY. PROVIDE DISCONNECT MEANS AND OVERLOAD PROTECTION AS REQUIRED.JUMPER