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1 69-1012 OWNER’S GUIDE MagicStat ® /3355 Programmable Thermostat by Honeywell W eekday/Weekend (5-day/ 2-day) Programmable Heat and/or Cool Low V oltage (20 to 30 V ac) Thermostat and Mounting Plate Model CT3355 69-1012[...]

2 69-1012 Welcome to the world of comfort and energy savings with your new Honeywell MagicStat® Programmable Thermostat. Y our new thermostat will automatically control the temperature in your home, keeping you comfortable while saving energy when pro- grammed according to the instructions in this manual. Direct any questions concerning the applic[...]

3 69-1012 T able of Contents Step 1: Prepare For Installation ..................................................................................................... 4 Step 2: Remove Old Thermostat ................................................................................................... 6 Step 3: Install Batteries ..........................[...]

4 69-1012 Step 1: Prepare for Installation ■ ■ Check T able 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. T able 1. Compatibility Char t. Not compatible with any 120/240 volt circuit. a Compatible with 2-wire Hon[...]

5 69-1012 ■ ■ Acquire tools and items below as needed. Also purchase two AA alkaline batteries; we recom- mend Energizer® batteries. M878B CROSS-RECESSED SCREWDRIVER HAND OR POWER DRILL WITH 3/16 INCH DRILL BIT, IF NEEDED TO DRILL HOLES IN WALL WIRE CUTTER/STRIPPER OR SHARP KNIFE, IF NEEDED TO STRIP WIRES MASKING TAPE, IF  NE[...]

6 69-1012 Step 2: Remove Old Thermostat ■ ■ T est to make certain that your heating and cooling systems are working properly . If either does not work, contact your local heating/air conditioning dealer . T o avoid compressor damage, do not operate the cooling system when outdoor temperature is below 50 ° F (10 ° C). ■ ■ TURN OFF POWER to[...]

7 69-1012 Replacing a Clock Thermostat that has C or C1 Clock T erminals? 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 the[...]

8 69-1012 Step 3: Install Batteries IMPORT ANT Batteries must be installed for programming and oper ation of the thermostat and heating/cooling system. ■ ■ Purchase two AA alkaline batteries; non- alkaline batteries do not last as long, and can leak, causing damage to the thermostat or the wall surface. We recommend Energizer® batteries. ■ ?[...]

9 69-1012 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. After the batteries are completely dead, the bAt Lo indicator disappears, leaving a com- pletely blank display . Press down on the left ends of the [...]

10 69-1012 Step 4: Program Thermostat After the batteries are installed, the thermostat can be easily programmed in your hand, before it is installed on the wall. If you prefer to program the thermostat after it is installed on the wall, skip to page 18, and return later to this programming section. The following Personal Programming Chart (pages 1[...]

11 69-1012 to give the furnace a head start to heat the house before you arrive home. (Again, this is higher heating or lower for cooling.) 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. For more comfortable sleeping, some people choose not to ra[...]

12 69-1012 Personal Programming Chart Heating Pr ogram Weekdays Start Time Heating Temperature WAKE LEAVE RETURN SLEEP Weekends WAKE SLEEP W AKE 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 [...]

13 69-1012 Weekdays Start Time Heating Temperature WAKE LEAVE RETURN SLEEP Weekends WAKE SLEEP Cooling Program W AKE 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 an[...]

14 69-1012 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. Set Current T ime/Day T o set the time, press [...]

15 69-1012 Press to program W AKE time and press to program WAKE temperature for Mon-Fri. Repeat sequence for LEA VE, RETURN, and SLEEP . Press until SA T SUN, WAKE and SET appear on the display . Press to program W AKE time and to program WAKE temperature for Sat-Sun. Repeat sequence for SLEEP . Cooling Program With system switch at COOL, follow t[...]

16 69-1012 A quick guide for operating or making changes follows: NOTE: System switch must be set to Heat or Cool to perform the following. T emporarily Change temperature for current period only — press ; TEMPORAR Y indicator shows on display; canceling itself at the next scheduled change, or to cancel sooner press . Hold a temperature indefinit[...]

17 69-1012 Check Programs— press , repeatedly to view each time and temperature; then press . Cancel a program— press , until program to cancel shows; then press . Check Usage — Press 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 to cle[...]

18 69-1012 Step 5: Adjust Fan Operation Switch, as Required ■ ■ 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 your system is an electric heat system, set the switch to E. The E setting allows the fan to turn on immediately[...]

19 69-1012 First, turn in both screws completely , then adjust for system type: • W arm Air Furnace—Set at the Hot Water setting (A—out one turn, B—leave in). • Electric Furnace—Leave at the W arm Air Furnace setting (A—leave in, B—leave in). NOTE: This thermostat does not have a setting for steam/gravity air . Cycles would not be l[...]

20 69-1012 R Rc W Y G B D A C THERMOSTAT BACK M8796 DISPLAY ° F DISPLAY ° C C–IN C–OUT 1 TURN FOR HIGH EFFICIENCY FURNACE (90%+ AFUE) ADJUST: SCREW A–OUT ONE TURN SCREW B–IN FUEL SWITCH – F POSITION F E FUEL SWITCH WARM AIR FURNACE HOT WATER BOILER ELECTRIC  FURNACE A–IN  A–OUT 1 TURN A?[...]

21 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 w[...]

22 69-1012 ■ ■ Level for appearance only; thermostat functions properly even when not level. T ighten the mounting screws. LEVEL M1714A[...]

23 69-1012 Step 8: Wire Thermostat T erminals NOTE: All wiring must comply with local codes and ordinances. If unsure about household wiring procedures, call your local heating/air conditioning contractor . Refer to masking tape labels you placed on the wires when you removed your old thermostat. ■ ■ Match the letter of your old thermostat wire[...]

24 69-1012 ■ ■ 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. M1712A JUMPER (FACTORY- INSTALLED)[...]

25 69-1012 R Rc W Y G B D A C 2-WIRE HEAT-ONLY (JUMPER INTACT) M8793 L1 (HOT) L2 POWER SUPPLY. PROVIDE DISCONNECT MEANS AND OVERLOAD PROTECTION AS REQUIRED. 1 1 HEATING RELAY OR VALVE COIL JUMPER R Rc W Y G B D A C 4-WIRE HEAT/COOL (JUMPER INTACT) L1 (HOT) L2 POWER SUPPLY. PROVIDE DISCONNECT MEANS AND OVERLOAD PROTECTION AS REQUIR[...]

26 69-1012 R Rc W Y G B D A C 5-WIRE HEAT/COOL (JUMPER REMOVED) L1 (HOT) L2 POWER SUPPLY. PROVIDE DISCONNECT MEANS AND OVERLOAD PROTECTION AS REQUIRED. 1 M8795 L1 (HOT) L2 COOLING CONTACTOR COIL FAN RELAY HEATING RELAY OR VALVE COIL 1 1 R Rc W Y G B D A C 3-WIRE COOL-ONLY (JUMPER INTACT) L1 (HOT) L2 POWER SUPPLY. PROVIDE [...]

27 69-1012 Step 9: Mount Thermostat NOTE: T o remove the thermostat from the wall, first pull out at the bottom of the thermostat, then remove the top. M1734A B. PRESS LOWER EDGE  OF CASE TO LATCH. SWING OPEN COVER  TO CHECK  OPERATION. A. ENGAGE TABS AT TOP OF  THERMOSTAT AND MOUNTING PLATE. C.[...]

28 69-1012 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. Move the system switch to HEA T[...]

29 69-1012 Cooling T o avoid possible compressor damage, do not operate the cooling system when outside temperature is below 50 ° F (10 ° C). See compres- sor manufacturer instructions for further information. NOTE: When cooling setting is changed, thermostat may delay up to five minutes before turning on the air conditioner . This delay protects[...]

30 69-1012 Step 1 1: Set Fan and System Switches First set the fan switch. F AN 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 therm[...]

31 69-1012 Then set the system switch. COOL: The thermostat controls your air conditioning system. OFF: Both the heating and air conditioning systems are off. HEA T : The thermostat controls your heating system. Heat Cool Off Heat Cool Off M1703 Heat Cool Off M1707[...]

32 69-1012 T roubleshooting Guide If … Then… Display will not come on. ■ 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 p[...]

33 69-1012 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. Cooli[...]

34 69-1012 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 pro[...]

35 69-1012 The furnace cycles too frequently or the system cycle length is too short or too long. ■ Readjust system on-time according to instructions on pages 18 and 19. 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 [...]

36 69-1012 30% 28% 26% 24% 22% 20% 18% 16% 14% 12% 8% 6% 2% 10% 4% Minneapolis St. Paul Montreal Ottawa Toronto Buffalo Cleveland Milwaukee Edmonton Regina Winnipeg Calgary Moncton North Bay Quebec St. John's Halifax Vancouver Denver Des Moines  Omaha Salt Lake City Boston Chicago Detroit?[...]

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39 69-1012 Limited One-Y ear 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 shal[...]

40 69-1012 69-1012 6-96 J.S. Printed in U.S.A. Copyright © 1996 Honeywell Inc. All Rights Reserved ® U.S. Registered Trademark Helping You Control Your World Home and Building Control Honeywell Limited-Honeywell Limitée 155 Gordon Baker Road North York, Ontario M2H 2C9 Home and Building Control Honeywell Inc. Honeywell Plaza P.O. Box 524 Minneap[...]