Honeywell 191108AJ Thermostat User Manual

Honeywell 191108AJ Thermostat

Preparation

Check the 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 the thermostat is powered by batteries. If the thermostat is not powered by batteries, refer to Table 1 for thermostat and system compatibility information
NOTE: Order Q682B Subbase separately.

Recycling Notice
This control contains mercury in a sealed tube. Do not place control in the trash at the end of its useful life. If this control is replacing a control that contains mercury in a sealed tube, do not place your old control in the trash. Contact your local waste management authority for instructions regarding recycling and the proper disposal of this control, or of an old control containing mercury in a sealed tube. If you have questions, call Honeywell Inc. at 1-800- 468-1502.

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
Fan Coil Unit	•       Compatible. Assure correct subbase identity is selected for fan control.
Gas—Direct Spark Ignition (DSI), Intermittent Pilot (IP), and Standing Pilot (SP)	•       Compatible. If not using battery backup, assure that 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 require an R8239D1015 Isolating Relay in the thermostat control circuit. a •       Some 3-wire valves require an R8239A1052 Isolating Relay in the thermostat control circuit. a, 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 require an R8239D1015 Isolating Relay in the thermostat control circuit. a Check control amperage requirement.
Warm Air Zone	•       Most are compatible.

• If the 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.
• Consult manufacturer for installation requirements

Installation

WHEN INSTALLING THIS PRODUCT…

1. Read these instructions carefully. Failure to follow them could cause a hazardous condition.
2. Installer must be a trained experienced service technician.
3. After installation is complete, check out product operation as provided in these instructions.
   IMPORTANT: An incorrectly leveled sub-base will cause the temperature control to deviate from the setpoint. It is not a calibration problem.

CAUTION 

1. Disconnect the power supply to prevent electrical shock or equipment
2. To prevent interference with the thermostat link-age, keep wire length to a minimum and run wires as close as possible to the
3. Do not overtighten thermostat captive mounting screws because damage to subbase threads can
4. Do not short across coil terminals on the relay. This can burn out the thermostat heat anticipator

LOCATION
Locate the thermostat about 5 ft [1.5m] above the floor in an area with good air circulation at an average temperature. Do not mount the thermostat where it may be affected by:

• drafts, or dead spots behind doors and in corners.
• hot or cold air from ducts.
• radiant heat from the sun or appliances.
• concealed pipes and chimneys.
• unheated (uncooled) areas such as an outside wall behind the thermostat.

Run wires from the heating, cooling or heating/cooling equipment to the new thermostat location. Refer to the Typical Wiring Diagrams section to determine the number of wires required for your application.

UNPACK THERMOSTAT
Handle your new thermostat carefully; rough handling may interfere with its accuracy. Before unpacking, refer to Fig. 1. Remove and discard the shipping wrap.
IMPORTANT: Save the package of screws and instructions for the homeowner. Remove the thermostat cover by lifting it from the bottom. Set aside cover until needed later. Carefully remove the material protecting the mercury switch bulb. Loosen two captive mounting screws and separate the wallplate (if provided) from the back of the thermostat base.

MOUNT WALLPLATE OR SUBBASE Wall Mounting (Fig. 2)
Hold the wallplate or subbase in position on the wall (Fig. 2). Mark holes on the wall for anchors. Use a spirit level to make sure the wallplate or subbase is level. Drill 3/16-in. holes, and gently tap anchors into holes until flush with the wall. Pull wires through the large wiring hole in the wallplate or subbase. Loosely fasten the wallplate or subbase to the wall with the three screws. Do not completely tighten the screws.
Carefully level the wallplate or subbase (Fig. 3), and firmly tighten the screws.

 

Fig. 3—Leveling methods for wallplate or subbase.

Outlet Box Mounting (Fig. 4)
Use a horizontally mounted outlet box if possible. If a vertical outlet box is used, mount the wallplate or subbase on a 193121A (beige) Cover Plate Assembly (ordered separately). Follow the instructions provided with the cover plate assembly. Align the wallplate or subbase mounting holes on the outlet box and loosely fasten it with two screws. Carefully level the wallplate or subbase (Fig. 3), and firmly tighten the screws.

WIRE WALLPLATE OR SUBBASE
Follow the instructions provided by the heating, cooling, or heating/cooling equipment manufacturer. If not available, refer to the Typical Wiring Diagrams section at the end of this publication. Disconnect the power supply before making wiring connections to prevent electrical shock or equipment damage.

Fig. 4—Mounting wallplate or subbase on horizontal outlet box.

 

NOTE: All wiring must comply with local electrical codes and ordinances. This thermostat clock can be powered by a 24 Vac transformer with battery backup. Refer to Figs. 15 through 19 for hookup diagrams of typical powering applications. For Wallplate (Heating or Cooling Systems) Refer to Fig. 5 and strip the thermostat wire insulation as necessary. For heating-only systems, connect wires to R, W, and C (if applicable) terminals (Fig. 20). For cooling-only systems, connect wires to R, Y, and C (if applicable) terminals. Firmly tighten the screws Push excess wire back into the wall. Plug the hole in the wall with nonhardening caulk, putty,or nonflammable insulation to prevent drafts from affecting thermostat operation.

Subbase (Heating/Cooling Systems)
Refer to Fig. 5 and strip the thermostat wire insulation as necessary. Connect the wires to the corresponding terminals on the sub-base. If labels do not agree with your new subbase, refer to Table 2 and the installation instructions furnished with the subbase.
NOTE: If wiring a dual transformer system, only the O or the B terminal may be used. Push excess wire back into the wall. Plug the hole in the wall with nonhardening caulk, putty, or nonflammable insulation to prevent drafts from affecting the thermostat operation.

Fig. 5—Methods of connecting terminals.

TABLE 2—SUB BASE TERMINAL DESIGNATIONS

Subbase Terminal	Control Function
R	Control transformer power.
Rc	Line side of 24V power supply; cooling side, 2 transformer heat/cool system.
Rh	Line side of 24V power supply; heating side, 2 transformer heat/cool system.
W	Heating control circuit.
Y	Cooling control circuit; jumper to W for heat pump compressor control if no P terminal on subbase.
G	Fan control circuit.
C	Clock control (transformer common).
O	Cooling damper or changeover/reversing valve, makes continuously in cool.
B	Heating damper or changeover/reversing valve, makes continuously in heat.
P	Heat pump contactor; P terminal on some models only.

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 the thermostat base on the wallplate or subbase. Insert the two captive mounting screws located in the bottom corners of the base (Fig. 6). Firmly tighten the screws.

INSERT TIMER BATTERIES
Power is supplied to the clock by the 24 Vac transformer or two AAA alkaline batteries (included), or by the heating or cooling control circuit. Backup batteries may be installed to supply power to the clock if power is interrupted when using the 24 Vac powering method. Install the batteries in the thermostat (Fig. 7). Once a year or when the batteries are dead, replace them with two new AAA alkaline batteries. Properly dispose of old batteries. We recommend Energizer® batterie

 

Fig. 7—Insert timer batteries

 

Fig. 8—Set timer

 

SET TIMER
Adjust the timer by moving the knob clockwise. Do not reverse the knob. When time is correctly set, the time indicator arrow (triangle shape) points to the correct time and the corresponding daytime (light) or nighttime (dark) portion of the program dial (Fig. 8).

SET HEAT ANTICIPATOR
Adjust the heat anticipator lever to match the current rating of the primary control for the proper cycle rate (Fig. 9). Adjustable anticipation must be set for the total current of heat and fan control. The current rating is usually stamped on the control or valve (Fig. 10), or a setting may be given in the device instructions. If no current rating or heat anticipator setting is given, measure the current with an ammeter. Proceed with the following steps. Remove the thermostat from the wallplate or subbase. Connect an ac ammeter of the appropriate range (about 0A to 2A) between the R and W terminals on the wallplate or subbase, except for electric heat and heat pump systems. Let the system operate for one minute. Adjust the heat anticipator lever to match the number that reads on the ammeter.

Fig. 9—Adjust heat, anticipator.

 

Fig. 10—Current rating of primary control.

 

ATTACH THERMOSTAT COVER
Make sure the packing inserts in the thermostat base are removed. Place the two tabs on the upper edge of the cover into the mounting slots in the thermostat base (Fig. 11) Swing the cover down until it catches at the bottom of the base

 

SET TEMPERATURE CONTROL LEVERS
The two levers on the top of the thermostat control the low and high temperatures for energy savings and comfort control (Fig. 12). The lever on the left (blue mark) controls the lower temperature. The lever on the right (red mark) controls the higher temperature. We recommend pushing the levers together at an appropriate temperature for either heat or cool until the occupant programs the thermostat and makes the final temperature selections.

SET SUBBASE SWITCHES (IF APPLICABLE)
The sub-base system switch controls system operation as follows:
HEAT: The heating system is controlled by the thermostat. The cooling system is off.
COOL: The cooling system is controlled by the thermostat. The heating system is off.
OFF: Both the heating and cooling systems are off. If the the fan switch is in the AUTO position, the fan is also off.
The sub-base fan switch controls fan operation as follows:
ON: Fan operates continuously.
AUTO: The fan operates with the cooling equipment as controlled by the thermostat or with the heating equipment as controlled by the plenum switch. In electric heat, heat pump, and fan coil systems, the fan is
controlled by the thermostat in heating and cooling. To switch positions, use your thumb or index finger to slide the lever to the desired position. The switch lever must stop in detent over the desired function indicator mark for proper circuit operation.

Checkout

CAUTION
Do not check operation by shorting across the terminals of the system controls. This will damage the heat anticipator.

HEATING-ONLY SYSTEM
Turn on the power to the furnace. Push both temperature setting levers together at least 5° F [3° C] above the room temperature. The main burner should come on. The fan will start when the furnace heats up.
Move both levers 5° F [3° C] below the room temperature. The burner should shut off. Operate the entire heating system at least one complete cycle. If the thermostat fails any test, refer to the Troubleshooting
Guide in the Owner’s Manual. Reset both temperature setting levers to the desired temperatures.

COOLING-ONLY SYSTEM
Turn on the power to the cooling equipment. Push both temperature setting levers together at least 5° F [3° C] below the room temperature. The cooling equipment will operate, and the fan will start. Allow for any time delay that may be built into the compressor control circuit.
NOTE: To avoid compressor damage, do not operate the system when the outdoor temperature is below 50° F [10° C]. Refer to manufacturer recommendations. Move both levers 5° F [3° C] above room temperature. The cooling equipment and the fan should shut off. Operate the entire cooling system at least one complete cycle. If the thermostat fails any test, refer to the Troubleshooting Guide in the Owner’s Manual. Reset both temperature setting levers to the desired temperatures.

HEATING/COOLING SYSTEM
Turn on power to the furnace and cooling system. Place the system switch lever to HEAT and the fan switch lever to AUTO. Push both temperature setting levers together at least 5° F [3° C] above room temperature. The main burner should come on. The fan will start when the furnace heats up. (If Central electric heat, fan coil or heat pump system, the fan starts immediately.) Move both levers 5° F [3° C] below room temperature. The burner should shut off. Place the system switch lever to COOL and the fan switch lever to AUTO. The cooling equipment will operate, and the fan will start. Allow for any time delay that may be built into the compressor control circuit.

NOTE: To avoid compressor damage, do not operate the system when the outdoor temperature is below 50° F [10° C]. Refer to manufacturer recommendations. Move both temperature setting levers together at least 5° F [3° C] above the room temperature. The cooling equipment should shut off. Place the fan switch to ON. The fan should run continuously with the system switch in any position. Place the system switch to OFF. Move both temperature setting levers to various positions. The heating and cooling systems should not operate. Operate the entire system for at least one complete cycle with the system switch at COOL and one complete cycle with the switch at HEAT. If the thermostat fails any test, refer to the Troubleshooting Guide in the Owner’s Manual. Reset both temperature setting levers to the desired temperatures. Leave the Owner’s Manual and Assistance Information in a convenient place for the building occupant or provide other appliance manuals.

Calibration

THERMOMETER
The thermometer in your thermostat was accurately calibrated at the factory. The thermometer should need adjustment only if it has been dropped or shifted due to mishandling. If the setpoint lever and the thermometer reading do not agree:

1. Remove the thermostat cover by pulling up from the bottom of the cover until it clears the mounting slots.
2.  Set the thermostat cover on a table near an accurate thermometer.
3. Allow five minutes for the cover thermometer to sense the area temperature; compare the readings. Be careful not totouch the thermometer or breathe on it.
4. If the readings are the same, replace the cover and put the system into operation.
5. If the readings are different, insert a small screwdriver into the thermometer and turn it until the thermometers have the same reading (Fig. 13).
6. Replace the thermostat cover and put the system into operation.
   NOTE: Radiant heat from your hands will offset the thermometer reading. After making each adjustment, wait five or ten minutes for the thermometer to stabilize before comparing.

THERMOSTAT
This thermostat was calibrated at the factory and should not need recalibration in the field. If recalibration seems necessary, first be sure the wallplate or subbase is accurately leveled. Then check the thermometer calibration. To check thermostat calibration, allow several hours of operation after installation. Then read the thermometer and remove the cover. Push temperature levers together to a setting below room temperature. Slowly move them up the scale together until the mercury slides across the tube. If the thermometer reading and the high-temperature lever position are approximately the same at the instant the mercury moves to the other end, no recalibration is needed.

Fig. 13—Thermometer calibration

 

If calibration is necessary, proceed as follows:

1. Remove the cover.
2. Place open-end calibration wrench, part no. 104994A (ordered separately), on the hex nut under the bimetallic coil controlled by the red lever (Fig. 14). Hold the lever so it does not move, and gently turn the wrench clockwise until the mercury rests securely in the right end of the tube.
3. Put the thermostat cover on and wait ten minutes.
4. Read the thermometer. Then remove the cover. Moving both levers, place the HIGH lever at the thermometer reading. Hold the lever so it does not move, and gently turn the wrench counterclockwise until the mercury just slides to the left end of the tube but no farther. Try to do this quickly so the heat from your hands does not affect the thermostat.
5. Repeat this procedure for the blue lever

Fig. 14—Use of 104994A calibration wrench.

 

Typical Wiring Diagrams

Fig. 15—Typical hookup for timer powered by a separate 24-Vac transformer.

 

Fig. 16—Typical hookup for timer powered by two AAA alkaline batteries only

 

Fig. 17—Typical hookup for timer powered by
system transformer. Timer powered by battery when the system is not powered (e.g., power to the system is off or interrupted).

 

Fig. 18—Typical hookup for timer powered through the control system. Timer powered by the battery when the heating or cooling equipment is on; the timer takes power from the system when The heating equipment is off.

 

Fig. 19—Typical hookup for timer powered through control system. Timer powered by battery when heating or cooling equipment is on; timer takes power from system when cooling equipment is off.

 

Fig. 20—Internal schematic and typical hookup for T8190A Thermostat/191108AJ Wallplate in the heating-only system.

 

Home and Building Control Home and Building Control Helping You Control Your World
Honeywell Inc. Honeywell Limited—Honeywell Limitée
1985 Douglas Drive North 740 Ellesmere Road
Golden Valley, MN 55422 Scarborough, Ontario M1P 2V9

Reference

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Honeywell 191108AJ Thermostat User Manual

Honeywell 191108AJ Thermostat User Manual