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Honeywell T8501 manual

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Table of contents for the manual

  • Page 1

    ® U.S. Regi stered T rademar k Copyright © 2004 Honeywe ll • • All Rights Reserved INSTALLATION INSTRUCTIONS 69-0925-4 T8501 Microelectronic Thermostats APPLICATION The T8501 M icroelectroni c Thermostats provides el ectronic contro l of 24 V ac single-stage heating and cooling systems. Refer t o T able 1 for a general descrip tion of the the[...]

  • Page 2

    T8501 MICROELECTRO NIC THERMOSTATS 69-0925—4 2 Fig. 1. T ypical loca tion of the rmostat. Fig. 2. Mounting the wallplate . WIRING All wiring must comply wit h local electrical codes and ordinanc es. Refe r to Fig. 3 a nd 5 for typi cal hooku p. A letter code is located near each termina l for ident ification. CAUTION Electrical S hock Hazard. Can[...]

  • Page 3

    T8501 MICROELEC TRONIC THERMOST ATS 3 69-0925—4 Fig. 4. T ypical hookup in heat and cool sy stem with one tran sformer. Fig. 5. T ypical hookup in heat and cool sy stem with two transform ers. . Fig. 6. Correct wi ring techni que. Mounting Thermosta t 1. Engage t abs at the t op of the th ermost at and wall - plate. See F ig. 7. 2. Press lower ed[...]

  • Page 4

    T8501 MICROELECTRO NIC THERMOSTATS 69-0925—4 4 Using Thermostat Keys The thermo stat k eys are use d to: • set the tem perature, • display present setting, • configure Installer Setup, • check System-T est, • display outdoor t emperature ( select mode ls), Select models have keys to: • set the system op eration, • set the fan op era[...]

  • Page 5

    T8501 MICROELEC TRONIC THERMOST ATS 5 69-0925—4 Fig. 10. Disp lay of all LC D segments. . Fig. 1 1. Display of I nstaller Setup number and sett ing. CAUTION Equipment Damag e Hazard. Heat pump and ele ctric heat syst ems can be damaged when ru n without fan . Configure to 0 1 in Installer Setup nu mber 02 to prevent equip ment dama ge. IMPORT ANT[...]

  • Page 6

    T8501 MICROELECTRO NIC THERMOSTATS 69-0925—4 6 IMPORT ANT Review the setting s to confirm th at they match the system. Pres s Run Progra m to exit the Inst aller Setup. The thermos tat ha s saved the Installer Setup changes and initiated a reset in order to ope rate using the new settings. Be sure to set the curr ent day an d time immedi ately . [...]

  • Page 7

    T8501 MICROELEC TRONIC THERMOST ATS 7 69-0925—4 INSTALLER SYSTEM TEST Use the Installer System T e st to check the thermostat operation. Refer to T ab le 3 for a list of the available system tests. CAUTION Equipment Damag e Hazard. Minimum off time for comp ressor i s bypassed during Installer System T est. Prevent c ompressor from cycl ing too q[...]

  • Page 8

    T8501 MICROELECTRO NIC THERMOSTATS 69-0925—4 8 Key or Switch Oper ation Syst em-T est a IMPORTANT T est numbers ar e display ed only whe n the syste m is confi gured for t he selec ted funct ion. Example: Numbe rs 60, 61 and 62 are the only numbers th at are displayed wh en a system is configu red for heat only . System Ke y or Switc h System Tes[...]

  • Page 9

    T8501 MICROELEC TRONIC THERMOST ATS 9 69-0925—4 THERMOSTAT INFORMATION 1. Press the i key to access the t hermostat informa- tion. 2. Press the increase ! ke y to display the produ ction date code. Th e first two lar ge digits are the m onth and the thi rd digit is the la st digit of the year (Exam- ple: 026 = Fe bruary 199 6). 3. Press the incre[...]

  • Page 10

    T8501 MICROELECTRO NIC THERMOSTATS 69-0925—4 1 0 TROUBLESHOOTING GUIDE T able 5. T roubl eshooting Gu ide. Symptom P ossible Ca use Action Display will not come on. Thermostat is not be ing powered.l • Check that C te rminal is connect ed to the system transfor mer . • Check for 24 V ac between C and R or RH termin als. — If missing 24 V ac[...]

  • Page 11

    T8501 MICROELEC TRONIC THERMOST ATS 1 1 69-0925—4 Cooling will not come on. No power to th e thermostat. • Ch eck that C term inal is connected to the system transfor mer . • Check for 24 V ac between C and R or RC and Y termi nals. — If missing 24 V ac: — check if the circuit brea ker is tripped—reset th e circuit breaker . — check i[...]

  • Page 12

    69-0925—4 G .H. Rev . 04-04 www .honeywell.com/yourhome T8501 MICROELECTRO NIC THERMOSTATS Automation and Control Solutions Honeywell Honeywell Li mited-Hon eywell Limi tée 1985 Dougla s Drive North 35 Dynamic Dri ve Golden Vall ey, MN 55422 Scarborough , Ontario M1V 4Z9[...]