HONEYWELL DT92A Wireless Room Thermostat
Room temperature
Set temperature, inquiry
Set temperature, adjustment
Switch ON/OFF (frost protection enabled)
Operating indicators
Heating demand indicator
Frost protection
Frost protection is not available in cooling operation
Fault indicator
Low battery indicator
RF communication
Loss of RF communications.
The Relay Box operates in Failsafe mode, as set by Installer.
Heat/cool changeover
Operation of the Relay Box
Automatic Operation
- The green LED on = rely on
- Green LED off = relay off
Temporary Manual Override
Press the button to temporarily override the current relay position
Loss of RF communications
If RF communication is lost, red LED lights and Relay Box operates in failsafe mode, as set in Installer Mode
What is a room thermostat? …an explanation for householders
A room thermostat simply switches the heating system on and off as necessary. It works by sensing the air temperature, switching on the heating when the air temperature falls below the thermostat setting, and switching it off once this set temperature has been reached. Turning a room thermostat to a higher setting will not make the room heat up any faster. How quickly the room heats up depends on the design of the heating system, for example, the size of the boiler and radiators. Neither does the setting affect how quickly the room cools down. Turning a room thermostat to a lower setting will result in the room being controlled at a lower temperature, and saves energy.
The heating system will not work if a time switch or programmer has switched it off. The way to set and use your room thermostat is to find the lowest temperature setting that you are comfortable with, and then leave it alone to do its job. The best way to do this is to set the room thermostat to a low temperature – say 18ºC – and then turn it up by one degree each day until you are comfortable with the temperature. You won’t have to adjust the thermostat further. Any adjustment above this setting will waste energy and cost you more money.
If your heating system is a boiler with radiators, there will usually be only one room thermostat to control the whole house. But you can have different temperatures in individual rooms by installing thermostatic radiator valves (TRVs) on individual radiators. If you don’t have TRVs, you should choose a temperature that is reasonable for the whole house. If you do have TRVs, you can choose a slightly higher setting to make sure that even the coldest room is comfortable, then prevent any overheating in other rooms by adjusting the TRVs. Room thermostats need a free flow of air to sense the temperature, so they must not be covered by curtains or blocked by furniture. Nearby electric fires, televisions, and wall or table lamps may prevent the thermostat from working properly.
This product and its associated documentation and packaging are protected by various intellectual property rights belonging to Honeywell Inc and its subsidiaries and existing under the laws of the UK and other countries. These intellectual property rights may include patent applications, registered designs, unregistered designs, registered trademarks, unregistered trademarks, and copyrights. Honeywell reserves the right to modify this document, product, and functionality without notice. This document replaces any previously issued instructions and is only applicable to the product(s) described. This product has been designed for applications as described within this document. For use outside of the scope as described herein, refer to Honeywell for guidance. Honeywell cannot be held responsible for the misapplication of the product(s) described within this document. Manufactured for and on behalf of the Environmental and Combustion Controls Division of Honeywell Technologies Sàrl, ACS-ECC EMEA, Z.A. La Pièce 16, 1180 Rolle, Switzerland, by its Authorised Representative Honeywell Inc.© 2009 Honeywell International Inc.
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HONEYWELL DT92A Wireless Room Thermostat User Guide
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