User manual HONEYWELL T7400

[. . . ] You are the owner of on&of the finest thermostats t?"w produced by Honeywell. The unique features of the T7400 Programmable Commercial Thermostat, satisfy the special requirements of commercial single zone aif conditioning systems, and provide convenience and temperature control accuracy that is un~oralleled in the industrv n7is thermostat also includes enerav saving feaiures which allow it to minimize the &rgy needed outdoor to maintain air for `We" comfort cooling conditions whenever by using possible. A thorough review of this Owner's Guide will help you identify those features which will maximize comfoit, convenience and savings in your application. Terms and words that may not be familiar to you are explained in the glossary at the end of this guide. STARTUP When power is first applied, an internal startup prcgrom begins. and takes place after any total loss of power (supply voltage and backup battery). [. . . ] During the unoccupied period, the economizer is controlled at 3 F [2 C) below the programmed UNOCClJPlED COOL set point. 23 24 OCCUPIED TO SET OCCUPIED TEMPERATURE COOL COOL TEMPERATURE SET KEYS Minimum OCCUPIED COOL setting is 3 F (2 C) higher than the ECONOMIZER set point (red ECONO indicator comes 0" while the - key is depressed to showwhe" you-have reached the lower adjustment limit). Maximum OCCUPIED COOL sewing cannot exceed the UNOCCUPIED COOL set point (red UNOCCUPIED indicator comes on while the + key is depressed to show when you have reached the upper adjustment limit). Limits of OCCUPIED COOL setiing can be changed by adjusting the ECONOMIZER and UNOCCUPIED COOLset points. 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. Press + or - until display shows the mechanical cooling temperature you want to maintain for the occupied period. NOTES OCCUPIED COOL temperature is the mechanical cooling system set point for the period when your building will Se occupied. 25 UNOCCUPIED COOI _ TEMPERATURE SET KEYS TO SET UNOCCUPIED TEMPERATURE COOL NOTES UNOCCUPIED COOL temperature is the mechanical cooling system set point for the period when ycxr building will be unoccupied. Minimum lower than OCCUPIED depressed adjustment UNOCCUPIED COOL setting cannot be the OCCUPIED COOL set point (red indicator comes on while the - key is to show when you have reached the lower limit). 1. 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. Press + or until display shows the mechanical cooling temperature you want to maintclin for the unoccupied period. Lower limit of UNOCCUPIED COOL setting can be changed by adjusting the OCCUPIED COOL set point. page 37. ) Upper (40 C). limit of the UNOCCUPIED COOL sewing is 99 F 27 lD SET START TIME KEYS TO SE3 START TIMES : 1. Press + or - until indicator identifies the dnv of week you want to program (Sunday. Red OCCUPIED indicator shows that VW have selected the OCCUPIED period for'progromming. review all start time schedules to verify that copying was completed without error. 31 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. 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. ). On Sunday, the building is unoccupied all day. Neither an OCCUPIED period nor an UNOCCUPIED period starts on Sunday. The building is UNOCCUPIED starting at II:00 am, on Saturday. and remains UNOCCUPIED until Monday morning at 7:OO am In programming Sunday's schedule, the CLEAR START TIME key would be used to clear OCCUPIED START and UNOCCUPIED START times for Sunday. and Friday are identical to those for Monday. [. . . ] and cooling in the OCCUPIED and UNOCCUPIED time pefiods. Minimum ON/Oft Times-Fixed minimum on/off equipment run times used to prevent harmful short cycling (turning on and off too often) which con significantly reduce equipment life or cause permanent damage. 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). 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. [. . . ]