Manual Honeywell CM727 (page 8 of 12) (English)

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8 CM700 Wireless - Programmable Room Thermostat

4.3 Using the Room Thermostat for Speciﬁc Applications

The CM727/721 RF room thermostat is a versatile controller that can be used to control many different

applications. For most typical applications, like wall-hung gas ﬁred combination boiler control or zone

valve control, no adjustments from the factory settings are required. For other applications, like controlling

an oil burner, the best system performance can be achieved by modifying selected parameters of the

room thermostat in the Installer mode. The table below lists the most common settings used for speciﬁc

applications.

4.4 Using the Special Features of the Room Thermostat

Special Feature: Description: Enable/Disable

Optimisation

(Variable Start Time)

The thermostat will adjust the start time in the morning/afternoon

so the desired temperature is reached by the start of the program

period. The system will restrict the start time to a max of 2 hours.

To enable: Set parameter

8:OP (category 1) to 1.

Scheduled

Maintenance Alert

Period

If the installation requires scheduled maintenance and the user

needs to be reminded that the service is due the parameter value

can be set to the required number of months (1-48). When the

preset period expires the CM721/CM727 will display the ‘SERVICE’

icon.

Set parameter 19:SP

to the required value to

enable maintenance alert.

Value set to zero disables

the function.

Summer/Winter Auto

time change

This feature moves time automatically on the last Sunday of March

and the last Sunday of October. The feature is factory enabled.

To enable: Set parameter

3:tC (category 1) to 1.

Temperature Offset If the thermostat is located in a particularly hot/cold location

for reliable signal transmission reasons then the measured/

displayed temperature can be adjusted by +/- 3°C. This is useful

if the homeowner wants the reading to match another appliance

temperature display.

Set parameter 12:

tO (category 1) to the

required offset value.

Upper/Lower

Temperature Limit

The normal upper temperature limit of 35°C can be reduced to

21°C to save the homeowner energy. The normal lower limit of 5°C

can be increased up to 21°C to protect inhabitants from cold.

Set parameter 6:uL

(category 1) to the desired

upper limit.

Set parameter 7:LL

(category 1) to the desired

lower limit.

Speciﬁc Application: Setting: What to change:

Cycle/

Hour

Minimum

ON Time

Note: All parameters listed below belong to

category 2 - System Parameters (see Installer

Parameters Table)

HEATING

Gas Boiler

(<30kW)

6 1 No changes required

Oil Boiler 3 4 Set 1:Ot parameter to 4

Set 2:Cr parameter to 3

Thermal Actuator 12 1 Set 2:Cr parameter to 12

Zone Valve 6 1 No changes required

1

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