Honeywell Programmable Room Thermostat 24 hour CM921

Product Information

The Pro Series Wireless Programmable Thermostat is a BRAND NEW 2021 launched, 7 day programmable room thermostat designed to replace all existing Honeywell CM Series Wireless Thermostats. The Pro Series Wireless Programmable Thermostat will replace the following Honeywell CM Series products:

Honeywell cmt921 24 Hour Wireless Programmable Thermostat

The CM921 thermostat is designed to provide automatic time and temperature control of heating or cooling systems. It can be used as part of a system in conjunction with combi boilers, oil-burners and gas fired boilers, circulation pumps, thermal actuators, zone values and electric heating systems Built-in memory holds the user program indefinitely so that it is never lost – even if you remove the batteries CM921 can be installed without disrupting your room decor as no wiring connection is required between the room unit and the boilerThe Honeywell CM921 is wireless and can be controlled remotely using the Honeywell Total Connect Comfort app, available for iOS and Android devices. This allows users to adjust their heating schedules and monitor their heating systems from anywhere, at any time. The device also features a frost protection mode that helps to prevent pipes from freezing during cold weather. The ‘Pro Series’ is made in the UK by Resideo (who were formally part of Honeywell International Inc.) and distributed to independent merchants via a national merchant wholesaler. Resideo (Honeywell Home) is the same manufacturer who made the CM700 & CM900 Series Thermostats.

Honeywell CM921 user manual (English - 18 pages)

If you take a good look at the Pro Series Wireless Programmable Thermostat, you will see it is nearly identical to Honeywell Home’s T3 Series Thermostat (the user display menu is identical). However, the big difference is that the Pro Series Wireless Programmable Thermostat will bind directly to any existing Honeywell Wireless Relay Boxes, where the T3 Series won’t, so you don’t have the hassle of having to get an installer out to fit this. Pro Series Wireless Programmable Thermostat – Replaces Honeywell CMS927 & CMS921 Wireless Programmable Room Thermostats The Honeywell CM921 can be programmed for up to six different time periods per day, allowing users to tailor their heating schedules to their individual needs and preferences. The device also features a holiday mode that allows users to set a lower temperature when they are away from home for an extended period of time, helping to save energy and reduce costs.The Honeywell CM921 Wireless 24Hr Programmable Room Thermostat can be used to control the heating circuit in a Sundial S or Y Plan and is particularly well suited to control combination boiler installations or additional zones in a S Plan Plus system. The Honeywell CM921 Wireless 24Hr Programmable Room Thermostat is for use where heating needs are the same from day to day. The CM927 can provide a different heating programme for each day of the week to maximise energy efficiency. Two wire, volt free connections are ideal for use with combination boilers. Honeywell CM921 Wireless 24Hr Programmable Room Thermostat Product Features: The Pro Series Wireless Programmable Thermostat works with the following Honeywell Wireless Relay Boxes: Reliable RF communication utilising 868 MHz band with 1 percent duty cycle limit to minimise communication disturbance Direct replacement for a Honeywell CM927/CMS927/CM727/CM921, if you are unsure about compatibility please call us on 01302 279234.