![]() ![]() NORM = conventional gas, oil, electric heat If the batteries fail the thermostat may fail to provide heating or cooling and the building may suffer accordingly. Watch out: the Filtrete™ 3M-22 is a battery-operated thermostat. How to Set the Room Thermostat HVAC Type & Heat Source SwitchesĮxample: 3M Filtrete™ 7-Day Programmable Thermostat Model 3M-22 Illustration and table above adapted from Honeywell's CT87 Owner's manual cited here: Source: Honeywell Owner's Manual, CT87N / CT87K Round Thermostat, Honeywell International, Inc., 1985 Douglas Drive North, Golden Valley MN, 55422 or in Canada: 35 Dynamic Drive, Toronto, Ontario M1V 4Z9, Canada, Website: retrieved 6. See THERMOSTAT INSTALLATION & WIRING MANUALSģ. In the CT87 owner's manual given below you'll see that the CT87N is for 24 Vac heating and cooling systems while the CT87K is for 24 Vac heating systems - that is the N model controls both heating and air conditioning. ![]() We should simply follow Honeywell's recommendations for the CT 87K thermostat Please just tell me which settings give the longest cycle on the CT87K.įred, There is no traditional heat-anticipator adjustment as was found on some older thermostats we describe in this article series. Thanks to reader Fred Gruber for asking about switch settings in the CT87K, 6 March 2016. This setting is for systems that allow the thermostat to control the fan in a call for heat, if a fan wire is connected to the G terminal.Ģ. In most cases you can safely install a new room thermostat without worrying about these switches - just leave the switch or switches in the factory-set position.īut in some circumstances setting the switches correctly may involve a change. Here we describe various types of internal or "hidden" switches found in some wall thermostats and in a table form we summarize their proper setting. How to Set the Cycle Rate or Fan Operation Switches on a Room Thermostat We also provide an ARTICLE INDEX for this topic, or you can try the page top or bottom SEARCH BOX as a quick way to find information you need. But in some circumstances setting the switches correctly may involve a change. In most cases you can safely install a new room thermostat without worrying about these switches - just leave the switch or switches in the factory-set position. ![]() These little slide or toggle switches may control the heating system on-off cycle rate or burner-on time in a manner similar to the heat anticipator feature found in other room thermostats. This article describes the purpose and setting of tiny switches found inside of some room thermostats. We have no relationship with advertisers, products, or services discussed at this website. InspectAPedia tolerates no conflicts of interest. ![]()
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