MagicStat®/3355 Programmable Thermostat by Honeywell OWNER’S GUIDE Weekday/Weekend (5-day/ 2-day) Programmable Heat and/or Cool Low Voltage (20 to 30 Vac) Thermostat and Mounting Plate Model CT3355 1 69-1012 69-1012
Welcome to the world of comfort and energy savings with your new Honeywell MagicStat® Programmable Thermostat. RECYCLING THERMOSTAT If this thermostat is replacing a thermostat that contains mercury in a sealed tube, see Fig. 1, do not place your old thermostat in the trash. Contact your local waste management authority for instructions regarding recycling and the proper disposal of your old thermostat.
Table of Contents Step 1: Prepare For Installation ..................................................................................................... 4 Step 2: Remove Old Thermostat ................................................................................................... 6 Step 3: Install Batteries .................................................................................................................. 8 Step 4: Program Thermostat .......................................................
Step 1: Prepare for Installation ■ Check Table 1 to make sure this thermostat is compatible with your system. If not, return to the retailer. For more information, call Honeywell Customer Assistance, toll-free 1-800-468-1502. Table 1. Compatibility Chart.
■ Acquire tools and items below as needed. Also purchase two AA alkaline batteries; we recommend Energizer® batteries.
Step 2: Remove Old Thermostat ■ Disconnect wires from the old thermostat or subbase. As you disconnect each wire, use masking tape to label it with the old terminal designation. If there are only two wires, they do not need to be labeled. If there is an extra wire that is not connected to your old thermostat, you will also not be connecting it to your new thermostat. Wrap wires as shown to keep them from falling back into the wall.
Replacing a Clock Thermostat that has C or C1 Clock Terminals? If you are replacing a Honeywell Chronotherm® Thermostat, you can find one or two wires that go to the C or C1 clock terminals on the Chronotherm® Thermostat wiring wallplate. Do not allow them to touch, or you may damage your transformer. Disconnect the wires and wrap them separately, using electrical tape. Do not wrap them together. Place the wires where they do not interfere with the operation of the new thermostat.
Step 3: Install Batteries IMPORTANT Batteries must be installed for programming and operation of the thermostat and heating/cooling system. ■ Purchase two AA alkaline batteries; nonalkaline batteries do not last as long, and can leak, causing damage to the thermostat or the wall surface. We recommend Energizer® batteries. ■ Make sure the thermostat is set to the OFF position. ■ Use a coin to remove the battery door.
indicator eventually stops flashing. bAt Lo stays on without flashing, indicating the thermostat and heating/cooling system have stopped working when the batteries are almost completely dead. Press down on the left ends of the batteries to remove. If you insert the new batteries within 20 to 30 seconds of removing the old ones, you do not have to reprogram the thermostat. However, if the display is blank, the batteries are dead or incorrectly installed and you must reprogram.
while you get ready for work or school. When deciding what time to set for your WAKE period, include extra lead time, depending on the outside temperature and your furnace response time, to give the furnace a head start to heat the house before you get up. (This will be a higher temperature during heating season, or a lower temperature during cooling season.
to give the furnace a head start to heat the house before you arrive home. (Again, this is higher heating or lower for cooling.) need to enter a time and temperature program for all periods if your schedule does not require it. For example, a house that is occupied during weekdays would only require programs for WAKE and SLEEP. SLEEP is the time period you can set for an energy-saving temperature while you are sleeping. (Again, this is lower for heating or higher for cooling.
Personal Programming Chart Weekdays WAKE 1 LEAVE RETURN SLEEP Heating Program Start Time 2 Heating Temperature 1 Weekends WAKE SLEEP 1 2 1 WAKE and RETURN start times should include extra lead time based on outside temperature and furnace response time, to give your furnace a head start to heat the house. The temperatures cannot be set any higher than 88°F (31°C) or any lower than 45°F (7°C).
Weekdays WAKE 1 LEAVE RETURN SLEEP Cooling Program Start Time 2 Heating Temperature 1 Weekends WAKE SLEEP 1 2 1 WAKE and RETURN start times should include extra lead time based on outside temperature and furnace response time, to give your furnace a head start to heat the house. The temperatures cannot be set any higher than 88°F (31°C) or any lower than 45°F (7°C).
This guide can be used for programming your new thermostat. NOTE: Batteries are required for operation and programming. When inserting batteries, set system switch to OFF. Remove the battery door (on the thermostat left side) using a coin at the bottom. Follow instructions on pages 8 and 9.
Tempp Time Ahead Press Warmer to program WAKE time and press Back to program WAKE temperature for Cooler M1699A M1 00A Mon-Fri. Repeat sequence for LEAVE, RETURN, and SLEEP. Press Weekend Schedule Time Ahead until SAT SUN, WAKE and SET appear on the display. Press to program Back Temp M1699A Warmer WAKE time and to program WAKE temperature for Sat-Sun. Repeat sequence for SLEEP.
A quick guide for operating or making changes follows: NOTE: System switch must be set to Heat or Cool to perform the following. Temp Warmer Temporarily Change temperature for current period only— press ; TEMPORARY indicator Cooler M1 00A Run shows on display; canceling itself at the next scheduled change, or to cancel sooner press Program . Tempp Hold a temperature indefinitely (such as when on vacation)— press Run HOLD appears on the display; to cancel, press Program .
Check Programs— press Weekday Schedule , Weekend Schedule repeatedly to view each time and temperature; then , Weekend Schedule until program to cancel shows; then press Run press Program . Cancel a program— press Weekday Schedule Clear . Check Usage — Press Usage for length of time heat or air conditioning has been running today since midnight; press again for yesterday’s usage, press again for cumulative; press Clear Run to clear cumulative reading, if desired; then press Program .
Step 5: Adjust Fan Operation Switch, as Required your system is an electric heat system, set the switch to E. The E setting allows the fan to turn on immediately with the heating or cooling in a system where the G terminal is connected. ■ The thermostat fan operation switch, labeled FUEL SWITCH (see illustration on page 20) is factory-set in the F position. This is the correct setting for most systems. If Step 6: Adjust System On-Time, °F/C °, as Required minimize room temperature swings.
First, turn in both screws completely, then adjust for system type: • Warm Air Furnace—Set at the Hot Water setting (A—out one turn, B—leave in). • Electric Furnace—Leave at the Warm Air Furnace setting (A—leave in, B—leave in). IMPORTANT When using a high efficiency furnace such as a 90% or greater AFUE (Average Fuel Utilization Efficiency) unit, adjust screw A out one turn and leave screw B in. NOTE: This thermostat does not have a setting for steam/gravity air.
THERMOSTAT BACK A C DISPLAY °F C–IN DISPLAY °C C–OUT 1 TURN B D ADJUST SCREWS THROUGH HOLES TO SELECT OPERATION DESIRED FUEL SWITCH HEATING SYSTEM POSITION F WARM AIR A–IN B–IN FURNACE F HOT WATER A–OUT B–IN BOILER 1 TURN E ELECTRIC A–IN B–OUT FURNACE 1 TURN W Y G FOR HIGH EFFICIENCY FURNACE (90%+ AFUE) ADJUST: SCREW A–OUT ONE TURN SCREW B–IN FUEL SWITCH – F POSITION FUEL SWITCH F E R Rc M8796 20 69-1012
Step 7: Mount Thermostat Mounting Plate ■ Position the mounting plate on the wall. Use a level to make sure the mounting plate is level. Use a pencil to mark the two mounting holes. ■ Remove the mounting plate from the wall, and drill 3/16-inch holes in the wall (if drywall) as marked. For firmer material such as plaster or wood, drill 7/32-inch holes. Gently tap anchors (provided) into drilled holes until flush with the wall.
■ Level for appearance only; thermostat functions properly even when not level. Tighten the mounting screws.
Step 8: Wire Thermostat Terminals ■ In 5-wire installations only, be sure to remove the factory-installed jumper connecting terminals R and Rc. NOTE: All wiring must comply with local codes and ordinances. If unsure about household wiring procedures, call your local heating/air conditioning contractor. METHOD TO INCREASE WIRE LENGTH Refer to masking tape labels you placed on the wires when you removed your old thermostat.
■ Loosen the terminal screws and slip each wire beneath its matching terminal. See illustration (lower right) for wire insertion technique. Securely tighten the terminals. ■ Plug the hole in the wall with insulation to help prevent drafts from adversely affecting the thermostat operation. Rc M3002A W Y G END OF WIRE VISIBLE HERE JUMPER (FACTORYINSTALLED) REMOVE IF 5-WIRE SYSTEM R 5/16 in.
4-WIRE HEAT/COOL (JUMPER INTACT) 2-WIRE HEAT-ONLY (JUMPER INTACT) A C B D W Y A C B D JUMPER G W Y G JUMPER Rc R HEATING RELAY OR VALVE COIL L1 (HOT) R HEATING RELAY OR VALVE COIL COOLING CONTACTOR COIL 1 L2 1 Rc POWER SUPPLY. PROVIDE DISCONNECT MEANS AND OVERLOAD PROTECTION AS REQUIRED. FAN RELAY L1 (HOT) L2 M8793 1 25 POWER SUPPLY. PROVIDE DISCONNECT MEANS AND OVERLOAD PROTECTION AS REQUIRED.
3-WIRE COOL-ONLY (JUMPER INTACT) 5-WIRE HEAT/COOL (JUMPER REMOVED) A C B D W Y A C B D W G Y G JUMPER R HEATING RELAY OR VALVE COIL Rc R COOLING CONTACTOR COIL FAN RELAY COOLING CONTACTOR COIL 1 FAN RELAY 1 L1 (HOT) L1 (HOT) L2 L2 1 Rc L1 (HOT) L2 1 POWER SUPPLY. PROVIDE DISCONNECT MEANS AND OVERLOAD PROTECTION AS REQUIRED. M8792 POWER SUPPLY. PROVIDE DISCONNECT MEANS AND OVERLOAD PROTECTION AS REQUIRED.
Step 9: Mount Thermostat NOTE: To remove the thermostat from the wall, first pull out at the bottom of the thermostat, then remove the top. A. ENGAGE TABS AT TOP OF THERMOSTAT AND MOUNTING PLATE. B. PRESS LOWER EDGE OF CASE TO LATCH. C. SWING OPEN COVER TO CHECK OPERATION.
Step 10: Check Thermostat Operation after Programming and Installing Heating Do not check heating system operation by jumpering thermostat terminals at the primary control such as the gas valve, zone valve, or oil burner control. This damages the thermostat, instead, jumper R and W wires at the thermostat. Cool Off Auto Heat On Warmer Cooler 28 Move the system switch to HEAT and the fan switch to AUTO. Press key until the setting is about 10°F (6°C) above room temperature.
Cooling To avoid possible compressor damage, do not operate the cooling system when outside temperature is below 50°F (10°C). See compressor manufacturer instructions for further information. Cool Off Auto Heat OnM1704 Warmer NOTE: When cooling setting is changed, thermostat may delay up to five minutes before turning on the air conditioner. This delay protects the compressor. Off Auto 29 Press key until setting is about 10°F (6°C) below room temperature. The cooling equipment and fan should start.
Step 11: Set Fan and System Switches First set the fan switch. FAN AUTO: Normal setting for most homes. A single-speed fan turns on automatically with the air conditioner or furnace. A two-speed fan usually runs on high with the air conditioner and on low with the furnace. Exception: If the fan operation switch on the back of the thermostat is set to the E position (see page 20), the fan operates only with the furnace. Auto On FAN ON: The fan runs continuously.
Then set the system switch. COOL: The thermostat controls your air conditioning system. Cool Off Heat OFF: Both the heating and air conditioning systems are off. Cool Off Heat HEAT: The thermostat controls your heating system.
Troubleshooting Guide If… Display will not come on. Then… ■ Set the system switch to OFF. Remove batteries. Insert backward for at least five seconds to reset thermostat. Replace batteries correctly. Display should come on. ■ Make sure batteries are fresh and installed correctly. ■ Gently clean battery contacts using a soft pencil eraser. Do not use anything abrasive on the clips. Temperature display will not go lower than 45°F (7°C) or higher than 88°F (31°C) during programming.
Heating will not come on. (Continued) ■ Jumper wires R and W. If heat does not come on, contact your heating dealer. ■ If display is blank or shows bAt Lo, install fresh batteries. ■ If temperature setting is higher than current temperature, and the display shows HEAT, contact Honeywell Customer Assistance at 1-800-468-1502. Cooling will not come on. ■ Check that the switch on the thermostat is set to COOL. ■ Check the system fuse or circuit breaker and replace or reset if necessary.
Cooling will not come on. (Continued) ■ If temperature setting is lower than the current temperature, and the display shows COOL, move the system switch from COOL to OFF for ten minutes. After ten minutes, return the switch to the COOL position. If the air conditioner comes on, compressor may have reached its high limit temperature protection and shut down. If the air conditioner does not come on after the ten minutes and the display shows COOL, contact Honeywell Customer Assistance at 1-800-468-1502.
The furnace cycles too frequently or ■ Readjust system on-time according to instructions on the system cycle length is too short pages 18 and 19. or too long. The thermostat's current setting does not match the display temperature to within ±1°. ■ Check that the wiring hole in the wall behind the wallplate was plugged with insulation to prevent drafts that might adversely affect the thermostat operation. ■ Be aware that it is normal for the current setting and display temperature to differ on occasion.
TYPICAL ENERGY SAVINGS FOR REPRESENTATIVE CITIES IN THE U.S. AND CANADA Savings for Once-A-Day 10°F (5°C) decrease Savings for Twice-A-Day 10°F (5°C) decrease* Savings for 5°F (3°) summer increase Approximate percentage of energy cost savings 30% 28% 26% 24% 22% 20% 18% 16% 14% 12% 10% 8% 6% 4% 2% Minneapolis St. Paul Montreal Ottawa Toronto Edmonton Regina Winnipeg Calgary Moncton North Bay Quebec St.
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Limited One-Year Warranty Honeywell warrants this product, excluding battery, to be free from defects in the workmanship or materials, under normal use and service, for a period of one (1) year from the date of purchase by the consumer. If, at any time during the warranty period, the product is defective or malfunctions, Honeywell shall repair or replace it (at Honeywell’s option) within a reasonable period of time.
Home and Building Control Honeywell Inc. Honeywell Plaza P.O. Box 524 Minneapolis, MN 55408-0524 Home and Building Control Honeywell Limited-Honeywell Limitée 155 Gordon Baker Road North York, Ontario M2H 2C9 69-1012 6-96 J.S. Printed in U.S.A. 40Trademark Copyright © 1996 Honeywell Inc. All Rights Reserved ® U.S. Registered Helping You Control Your World Printed on recycled paper containing at 69-1012 least 10% post-consumer paper fibers.