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). [. . . ] 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. Press + or until display shows the heating temberature you want to maintain during the occupied period. NOTES OCCUPIED HEAT temperature is the hentinn system set point for the period whei n vow buildina will be occupied. 21 ECONOMIZER TO SETECONOMIZER TEMPERATlJRE TEMPERATURE SET KEYS Minimum ECONOMIZER setting is 2 F (1 C) higher than the OCCUPIED HEAT set point (red HEAT indicator comes on while the - key is depressed to show when you have reached the lower adjustment limit). Maximum ECONOMIZER sewing is 3 F [2 C) lower than the OCCUPIED COOL set point (red COOL indicator comes on while the + key is depressed to show when you have reached the uppF!adjustment limit). Limits of ECONOMIZER setting can be changed by adjusting the OCCUPIED HEAT and OCCUPIED COOL set points. 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. Press\+ or - until display shows the temperature you would like to maintain with economizer operation during OCCUPIED period. NOTES ECONOMIZER set point is the temperature at which the economizer ("free" outdoor air cooling) is allowed to function if conditions allow. The programmed ECONOMIZER set point is active only during your building's OCCUPIED period. 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. [. . . ] 4-Install backup 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. 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. These assure that the system will remain operational even if the thermostat is not programmed `or the time and temperature schedules are lost due to battery failure. Economizer-An auxiliary control system which allows use of COOI outdwr air for "`ke" Caling. [. . . ]