Instruction/ maintenance manual of the product T8401C Honeywell
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® U.S. Regi stered T rademar k Copyright © 2002 Honeywell • • All Righ ts Reserved INSTALLATION INSTRUCTIONS 69- 1480- 1 T8400C and T8401C Electronic Thermostats The T8400 C and T8401C Th ermost ats p rovide single- stage, non-progr ammable temp erature contr ol for 24V heating-cooling systems with manua l changeover fr om heat to cool.
T8400C AND T8401C ELECTRONIC THERMOSTAT S 69-1480-1 2 Fig. 1. T ypical locati on of thermost at . Mounting Decorator Cover Pl ate and W allplate to W all IMPORTANT Level only fo r appearance. T he thermostat func- tions norm ally eve n when not lev el.
T8400C AND T8401C E LECTRONIC THERMOSTATS 3 69-1480-1 Fig. 3. Rest rict wiring to shaded area. Fig. 4. Wir ing connecti ons. Fig. 5. T8400C/ T8401C heat-c ool wiring dia gram in single tr ansformer s ystem with gas heat/ electric cooling. Fig. 6. T8400 C/T8401C heat-c ool wiring diagram in oil h eating/electric cooling sy stem.
T8400C AND T8401C ELECTRONIC THERMOSTAT S 69-1480-1 4 Slide the FAN switch in the bottom left corner of the thermostat to select the desired fan s etting. SYSTEM Switch System swi tch setti ngs contr ol thermos tat op eratio n as follows: Cool: The thermo stat controls the coo ling system.
T8400C AND T8401C E LECTRONIC THERMOSTATS 5 69-1480-1 3. Press the s key . Factory information is displa yed. A typical example is s hown, but informati on dis- played varies by model. This info rmation is for fac- tory use o nly . 4. Press the s key again to display °C or °F .
69-1480-1 G .H . Rev . 2-02 www .honeyw ell.com/yourho me Automation and Control Solu tions Honeywell Honeywell Limit ed-Honeywell Limi tée 1985 Douglas Drive North 35 Dynamic Drive Golden Valley, MN.
An important point after buying a device Honeywell T8401C (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 T8401C 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 T8401C - thus you can check whether the hardware meets your expectations. When delving into next pages of the user manual, Honeywell T8401C you will learn all the available features of the product, as well as information on its operation. The information that you get Honeywell T8401C will certainly help you make a decision on the purchase.
If you already are a holder of Honeywell T8401C, 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 T8401C.
However, one of the most important roles played by the user manual is to help in solving problems with Honeywell T8401C. Almost always you will find there Troubleshooting, which are the most frequently occurring failures and malfunctions of the device Honeywell T8401C 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
