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Honeywell 63-2666-03 manual

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  • Page 1

    PRODUCT DATA 63-2666-03 T7351 Commer cial Pr ogrammable Thermostat FOR SINGLE- OR MULTI-STAGE CO NV ENTIONAL/HEAT PUMP SYSTEMS APPLICATION The T7351 Commercial Programmable Thermostat controls 24 V ac commercial single zone heating, v entilating and air conditioning (HV A C) equi pment. The T7351 consists of a ther mostat and subbase. The ther most[...]

  • Page 2

    T7351 COMMERCIAL PROGRAMMAB LE THER MOSTAT 63-2666—0 3 2 OR DERING INFORMATION When purchasing replacement and moder nizat ion products from your TRADELINE® wholesaler or distr ibutor , refer to the TRADELINE® Catalog or price sheets for complete ordering number . If you ha ve additional questio ns, need fur ther i nf or mation, or would lik e [...]

  • Page 3

    T7351 COMMERCIAL PROGRAMMAB LE THER MOSTAT 3 63-2666—0 3 T able 2. Default Se tpoints. Fig. 1. Thermo stat and Subbase Dimens ions in inches (mm). Accessories: Duct Discharge Air Sensors: C7041B (6 or 12 in . [152 or 305 mm]), C7041C (18 in. [457 mm]), C7041J (12 ft. [3.66 m] a veraging), C7770A (8 in. [2 03 mm] probe). Outdoor Air Sensors: C7170[...]

  • Page 4

    T7351 COMMERCIAL PROGRAMMAB LE THER MOSTAT 63-2666—0 3 4 CAUTION Equipment Damage Hazard. Can damage the TIM con n ection be yond repair . Disconnect the TIM cable prior to opening or closing the ther mostat cov er . NO TE: Allow sufficient clearan ce below the thermostat to plug in the TIM cable . Install the remote-mounted sensor(s) about 5 ft.[...]

  • Page 5

    T7351 COMMERCIAL PROGRAMMAB LE THER MOSTAT 5 63-2666—0 3 Fig. 5. Nine TR21 Sensor s Pr oviding a T emperature A veraging Network fo r T7351 Thermostat. Fig. 6. Mountin g the Subbase. Wiring CAUTION Electrical Shock or Equi pment Damage Hazard. Can shoc k individuals or short equipment cir cuitry . Disconnect power supply bef ore installation. IMP[...]

  • Page 6

    T7351 COMMERCIAL PROGRAMMAB LE THER MOSTAT 63-2666—0 3 6 a F actor y jumper between RC and RH f or system s with one transf o rmer. b F or changeover functional details, see Operation section. c HC connection is not needed when using a TR23-H senso r . Mounting Thermostat on Subbase (Fig. 7) With the subbase installed, mount the ther mosta t: 1. [...]

  • Page 7

    T7351 COMMERCIAL PROGRAMMAB LE THER MOSTAT 7 63-2666—0 3 Setting System and F an System default setting is Auto . F a n default setting is On. NO TE: Use System and Fa n keys to change settings . System Settings — A uto: Th ermostat automatic ally ch anges between heating and cooling based on indoor temperature. — Cool: Ther mostat controls o[...]

  • Page 8

    T7351 COMMERCIAL PROGRAMMAB LE THER MOSTAT 63-2666—0 3 8 a In heat mode, when set f o r conv entional heat, the equ ipment (i.e. plenum s witch) could power the f an de spite the T7350. Fig. 8. Th ermostat Ke y Locations. INSTALLER SETUP F or mo st applications, the ther mostat factory settings do not need to be charged. Revie w the factory setti[...]

  • Page 9

    T7351 COMMERCIAL PROGRAMMAB LE THER MOSTAT 9 63-2666—0 3 a. If you want to sa ve the ne w conf iguration, use the u p  or down  ke y to change NO to YES bef ore pressing Run Schedule . b . If you w ant the configuration to remain as it was before starting this change, ensure the display indicates SA V CFG NO and press Run Schedule . NO TE: [...]

  • Page 10

    T7351 COMMERCIAL PROGRAMMAB LE THER MOSTAT 63-2666—0 3 10 OA TSENS 0 0 - 1 Outdoor Air Sensor Se lection 0: None 1: Remote Outdoor Air Sensor D A TSENS 0 0 - 1 Discharge Air Sensor Selection 0: None 1: Remote Discharge Air Sensor HUMSENS 0 0 - 2 Room Humidity Sensor selection 0: None 1: On Board Sensor 2: Remote Sensor OCCSENS 0 0 - 1 Occupancy S[...]

  • Page 11

    T7351 COMMERCIAL PROGRAMMAB LE THER MOSTAT 11 63-2666—0 3 Holida ys and 365 - Day Cloc k The T7351can be configured to schedule up to 10 separate holidays , each with a duration of up to 99 da ys. T o enable this function, the user must set the date: 1. Press Set Day and Set Time ke ys simultaneously . 2. Use the Up/Down ke ys to set the date to [...]

  • Page 12

    T7351 COMMERCIAL PROGRAMMAB LE THER MOSTAT 63-2666—0 3 12 4. Use the Up/Down ke ys to set the day , then press the ke y (Refer to T able 6 f or valid da y choices). 5. Use the Up/Down ke ys to set the duration. The first h oliday is now set and pressing the key will tak e you to progr ammin g the second holiday (denoted by the number 2 on the scr[...]

  • Page 13

    T7351 COMMERCIAL PROGRAMMAB LE THER MOSTAT 13 63-2666—0 3 a On: Continuous fan operation during occupied per iods. During not occu pied peri ods and in standby mode when no motion is sensed, fan cycles with ca ll f or heat or cool. A uto: Fan cycles with call f or heat or cool during all periods. (See Product Data Sh eet, form 63-2605, for more d[...]

  • Page 14

    T7351 COMMERCIAL PROGRAMMAB LE THER MOSTAT 63-2666—0 3 14 T7351 Rela y Logic All T7351 model ther mostats cont ain at l east fo ur switc hing relays . In conventional applications, the rela ys control first stage cooling, first stage heating, f an, and auxiliar y . In heat pump applications, the relays control the heat pump compressor , changeove[...]

  • Page 15

    T7351 COMMERCIAL PROGRAMMAB LE THER MOSTAT 15 63-2666—0 3 — Recov er y ramping applies between schedul ed heat or cool setp oint changes from not occupi ed to standby and not occupied to occupied. — Other setpoint changes use a setpo int step change. Reco ver y Ramping f or Heat Pump Systems During recov er y with h eat pump equipment, the h [...]

  • Page 16

    T7351 COMMERCIAL PROGRAMMAB LE THER MOSTAT 63-2666—0 3 16 The potentiometer adjusts t he minimum position of the economizer dampers, which pro vide a minimum amount of fresh air f or ve ntilation. The economizer reduces comp ressor run time, thereby sa ving energy and extending compressor life . The drawback to using the economizer is that dur in[...]

  • Page 17

    T7351 COMMERCIAL PROGRAMMAB LE THER MOSTAT 17 63-2666—0 3 T able 9. Default A uxiliar y Relay Operations. a Simple dehumidification uses a normally closed contact. The re la y is close d when humidity is below the high limit. When the humidity is above the high limit, the contact is open. Dehumidification There are fiv e meth ods through which th[...]

  • Page 18

    T7351 COMMERCIAL PROGRAMMAB LE THER MOSTAT 63-2666—0 3 18 T able 10. Hot Gas Bypa ss Dehumidification Logic. Auxiliary output dur ing call for multiple cooling stages f or two reasons: 1. This method assumes that the cooling provides dehumidification. 2. Multiple cooling stages probably provide necessar y dehumidification. NO TE: Hysteresis and a[...]

  • Page 19

    T7351 COMMERCIAL PROGRAMMAB LE THER MOSTAT 19 63-2666—0 3 WIRING DIAGRAM (FIGURES 14 AND 15) Fig. 14. T ypical Hookup of T7351F2010 in Three-Stag e Heat and Three-Stage Cool Conv entional System with One T ransformer . Cooling will not come on. No power to the thermostat. Check that X terminal is con nected to the system transf or mer . Check f o[...]

  • Page 20

    T7351 COMMERCIAL PROGRAMMAB LE THER MOSTAT Automation and Control Solu tions Honeywell International Inc. 1985 Douglas Drive North Golden Valley, MN 55422 customer.honeywell.com ® U .S. Registered T rademark © 2013 Hone ywell International Inc. 63-2666—03 M.S. Rev . 12-13 Printe d in United Stat es Fig. 15. T yp ical Hookup of T7351F 2010 in T [...]