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, Con~raiulations! You are the owner of on&of the finest thermostats t?“w produced by Honeywell.
STARTUP OPERATION When power is first applied, an internal startup prcgrom begins. This reauires 1 minute to complete. and takes place after any total loss of power (supply voltage and backup battery). IMPORTANT: Note that the T7400 svstem will not read instonton~usly to s&t point changes. Except os mentioned below, the minimum stage on- and otftimes will oIwoys be followed.
PROGRAM SCHEdJCE Each day of the week ccl” be individually programmed with an Occupied and an Unoccupied period to make maximum use of schedule variations. In addition to the Occupied and Unoccupied mode of thermostat operation. there is CI third mode called Intelligent Recovery”. Occupied operation is based on 3 set points: heat. economizer. and cool. Unoccupied operation is based on 2 set points: heating and cooling.
I 10 Convenient keyboard layout provides effortless program entry. .youi avenue to maximum energy and cost savings. The following pages provide function-by-function instructions to progrcrr the T7400 Programmable Commercial Thermostat. The following general steps are required to enter your weekly time and temperature schedule into the T7400. See the pages indicated for detailed programming instructions. l l l Enter the correct time and day. (3ee pages 14 through 17.
I 12 l SELECTING~HE DESIRED OPERATING DISPLAY (Optional) . PRESENT TIME and ROQM TEMPERATURE keys allow you to select c@tinuous display of time or temperature. respectively. •~ If neither key is pressed, T7400 will automatically revert to a display of,,present time within 2 minutes of the last keypress. PROBLEM INDICATORS Loss of Stored Program l Blinking display of 3 dashes (- -) indicates 10% of stored program. (Three steady dashes represent an occupied or unoccupied time slot that is not programmed.
SET CLOCK KEYS TO SET CLOCK 1. Press CLOCK 2. Press + or - until display shows correct time. NOTES The + and keys adjust and back.respectively. theclock ahead As you approach the correct time, repeatedly tap the + or - key to adjust minutes one at a time.
d SET DAY KEYS TO SET DAY 1. Press DAY key. 2. Press + or - until pointer on the display identifies the correct day of the week. NOTE Su=Sundoy: Mo=Monday; Tu=Tuesday; We=Wednesday; Th=Thursday: Fr=Friday; Sa=Saturdav.
L UNOCCUPIED TO SET UNOCCUPIED TEMPERATURE HEAT 1. Press UNOCCUPIED HEAT. Red UNOCCUPIED and HEAT indicators show that you have selected the WOCCUPIED HEATset point for programming. The display will show either the default or last entered unoccupied heat set point. 2. Press + 01 - until display shows the heating temperature you want to maintain during the unoccupied period.
I L / 1 1/ I [~~~Jl ~~~-;;-J~, 4 ‘III OCCUPIED TO SETOCCUPIED HEAT TEMPERATURE SET KEYS HEAT TEMPEL!ATURE 1. Press OCCUPIED HEAT. Red OCCUPIED and HEAT indicators show that you have selected tlx OCCUPIED HEATset point for programming. The display will show either the default or last entered occupied heat set point. 2. Press + or until display shows the heating temberature you want to maintain during the occupied period.
ECONOMIZER TO SETECONOMIZER TEMPERATURE SET KEYS TEMPERATlJRE 1. Press ECONOMIZER. Red OCCUPIED and ECONOMIZER indicators show that you have selected the ECONOMIZER set point for programming. The display will show either the default or last entered economizer set point. 2. Press\+ or - until display shows the temperature you would like to maintain with economizer operation during OCCUPIED period.
24 OCCUPIED TO SET OCCUPIED TEMPERATURE COOL TEMPERATURE SET KEYS COOL I. Press OCCUPIED COOL. Red OCCUPIED and COOL indicators show that you have selected the OCCUPIED COOL set point for programming. The display will show either the default or last entered occupied cool set point. 2. Press + or - until display shows the mechanical cooling temperature you want to maintain for the occupied period.
UNOCCUPIED TO SET UNOCCUPIED TEMPERATURE COOI _ TEMPERATURE SET KEYS COOL 1. Press UNOCCUPIED COOL. Red UNOCCUPIED and COOL indicators show that you have selected the UNOCCUPIED COOLset point for programming. The display will show either the default a last entered unoccupied cooling set point. 2. Press + or until display shows the mechanical cooling temperature you want to maintclin for the unoccupied period.
“1 lD SET START TIME KEYS TO SE3 START TIMES : 1. Press SELECT DAY. Display shows CI day-of-week indicator. 2. Press + or - until indicator identifies the dnv of week you want to program (Sunday. for &le). 3. Press OCCUPIED START TIME. Red OCCUPIED indicator shows that VW have selected the OCCUPIED period for’progromming. Display shows the start time currently programmed for the OCCUPIED period. If no start time has been programm&d. 3 dashes (- -) will be displayed. 4.
COPY DAY KEYS ;:TO COPY DAY NOTES ; 1. Press SELECT DAY 1 2. Press + or - until display indicator identifies the day with OCCUPIED START TIME and UNOCCUPIED START TIME YOU want to CODY to another dov. I 3. Press COP‘j DAY to begin
SAMPLE SCHEDULE 1 In this sample schedule, the owner wants the building’s temperature to be at the OCCUPIED HEAT/COOL set point beginning at 7:00 a.m. on Monday~through Saturday! In programming Sunday’s schedule, the CLEAR START TIME key would be used to clear OCCUPIED START and UNOCCUPIED START times for Sunday. The building’s UNOCCUPIED times vary On Monday, Tuesday, Thursday, and Friday. the building is UNOCCUPIED beginning at 500 p.n?. The UNOCCUPIED period starts later on Wednesday (9~00 p.m.).
SAMPLE SCHEDULE 2 In this sample schedule, the owner wants the building’s temperature to be at the OCCUPIED HEAT/COOL set point storticg at 1 I:00 a.m. Monday through~saturday. The Ocoupied period will end at I:00 a.m. on the following weekday mornings. and at midnight on Saturday. On Sunday, the building will be unoccupied all day, so the CLEAR STARTTIME key would be used to clear Sunda\is OCCUPIED START time. The UNOCCUPIED START times vary. The bu/lding is occupied on Saturday from 1 I:00 a.m.
FORM TO ENTER YQUR SCHEDULE OF OCCUPIED AND UNOCCUPIED START TIMES OCCUPIED Start timesa Sunday Monday Tuesday Wednesday Thursday Friday Saturday UNQCCUPIED start time& aTime at which you want your building to reach the OCCUPIED HEAT/COOL temperature set point. ~__ % ~me at which you want your building to control at the UNOCCUPIED HEAT/COOL temperature set point, -Fig. J-Example of temperature ~_~ -~__ ~- set points and resulting adjustment ranges.
38 l Review and write down the program contained in the.thermostat. Use th#? form on the preViOUS page. NOTE: Save the program replacement procedure thermostat program. . l l information. The battery results in the loss of the Loosen Allen screw at each corner alo”; the bottom of thermostat. Remove thermostat by winging bottom away and upward from wallplate or subbase (see Fig. 4). If bottew replacement is required, replace only with o f&h’Mailo~ MNlM)4’or equiv&nt C?-v61t alkaline battery.
L3ackupBattery-A bat& located in the 17400 thermostat that provides electricity to maintain your time and temperature schedule during power loss. If the battery is dead or runs down during o power failure, the time and temperature schedule will be lost. However. the thermostat will control to 11 standard Set of “default” set points when bower is restored Default Set Points-Temperature sewings of 458 F for heating, 72 F for economizer. and 78 F for ccooling that ore built into the T7400.
42 Single Zone Air Conditioning System-A packaged system that includes heating, cooling, and air distribution equipment. It might also include an economizer (see Economizer). These systems are selfcontained. often roof mounted. and condition the air in q specific local area v&h its own thermostat. Larger buildings may have 2 or more areas or zones, each with its own air conditioning system and thermostat. Thermostat Cycle-The time necessary for the heating or cooling equipment to come on, operate.
