Instruction/ maintenance manual of the product T8501 Honeywell
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® 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.
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.
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.
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, • che.
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 .
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.
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.
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 .
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).
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 .
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 .
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 Nort.
An important point after buying a device Honeywell T8501 (or even before the purchase) is to read its user manual. We should do this for several simple reasons:
If you have not bought Honeywell T8501 yet, this is a good time to familiarize yourself with the basic data on the product. First of all view first pages of the manual, you can find above. You should find there the most important technical data Honeywell T8501 - thus you can check whether the hardware meets your expectations. When delving into next pages of the user manual, Honeywell T8501 you will learn all the available features of the product, as well as information on its operation. The information that you get Honeywell T8501 will certainly help you make a decision on the purchase.
If you already are a holder of Honeywell T8501, but have not read the manual yet, you should do it for the reasons described above. You will learn then if you properly used the available features, and whether you have not made any mistakes, which can shorten the lifetime Honeywell T8501.
However, one of the most important roles played by the user manual is to help in solving problems with Honeywell T8501. Almost always you will find there Troubleshooting, which are the most frequently occurring failures and malfunctions of the device Honeywell T8501 along with tips on how to solve them. Even if you fail to solve the problem, the manual will show you a further procedure – contact to the customer service center or the nearest service center
