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Honeywell CM727 Manual

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6 CM700 Wireless - Programmable Room Thermostat
3.1 Automatic Operation
The relay box receives the heat demand (0-
100%) signal from the room thermostat. The room
thermostat will display the symbol on the LCD
display whenever more heat is required. Depending
on the demand the relay box will switch the heating
device on to match the current requirements of the
system.
The green LED indicates the status of the relay
output:
• GreenLEDon=relayon
• GreenLEDoff=relayoff
3.2 Temporary Manual Override
Pressing the relay box button will override the current relay position. As soon as the next signal is received
from the room thermostat the relay box will return back to automatic operation as the automatic control has
higher priority than manual operation.
3.3 Communications Loss
If the RF communication is lost for a period of 1 hour the red LED will illuminate to indicate that no RF
messages have been received during the last hour.
The relay box will also enter the failsafe mode as selected in Installer Mode (see section 4.2 BDR91 Relay
box Fail-Safe Mode Setup). To allow manual control of the relay box output manual override is available
in fail-safe mode. When RF communication is restored the relay box will automatically return to normal
operation.
You can now use the USER GUIDE supplied with the room thermostat to demonstrate how it works to the
home owner.
3) Basic Operation of the System
4) Installer Mode
Installer Mode is used to alter the system settings for specific applications, to use the special features of
the room thermostat in a different way or to alter the factory preset parameters. Parameters are divided
into two groups:
- Category 1 parameters – Room Thermostat Setup
- Category 2 parameters – System Setup.
These are all listed in section 4.5 Installer Parameters Table.
BDR91 Relay box
Push button and
relay status LED’s
… 6 …


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  • My heating is not coming on when I set it to the manual button Submitted on 26-5-2023 at 15:50

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    • It may be because the room temperature is already at temp. Try turning the temp up and see if it fires. Answered on 27-5-2023 at 08:53

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  • When I set my thermostat to manual the heating doesn’t come on, where am I going wrong. Thank you Submitted on 26-5-2023 at 15:49

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  • We’re going away for 4 weeks soon , I’ve set the Thermos on Auto to come on twice a day for an hour to prevent any freezing in the pipes- will the thermos still come on automatically between the set times if the temp drops below a certain level? In other words, will our heating be on full time when we’re away during a cold snap? Obviously this is going to incur high charges for us .Any advice appreciated Submitted on 12-12-2022 at 06:43

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  • Hi I have a CM721 and CM727 Honeywell Thermostat.
    I cannot manage to keep the temperature to remain constant, IE At night I sometimes need 23 C to stay warm during the night ( otherwise I get cramp! )
    Which button/s do I press and in which sequence please ?
    Many Thanks,

    Alan
    Submitted on 15-11-2021 at 12:31

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    • You’d have to leave the thermostat on manual and adjust the temperature with the up and down arrow buttons to the right hand side of the screen Answered on 15-11-2021 at 12:33

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  • Why does the heating come on outside of the times I have set it to come on, when in auto mode? Submitted on 3-11-2021 at 08:16

    Reply Report abuse


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