Cetetherm Mini Plus CM737
Installation, service and operating instruction
16
8.3
Holiday function
The holiday function allows you to set a constant temperature (default = 10°C) for a specified number of days
(from 1 - 99 days). This saves energy and related costs when the house is empty, but resumes normal
operation on the day of return.
To set the Holiday function:
1. Ensure the room thermostat is running in
AUTO
or
MAN
operating modes.
2. Press the holiday
button to display the holiday day’s counter and temperature setting, along with
the holiday indicator
.
3. Press the
or
time buttons to set the holiday time (1-99 days) and press the green
button to confirm.
4. Press the
or
buttons to set the holiday temperature (5°C - 35°C) and press the green
button to confirm.
The room thermostat will now control to the new temperature for the set number of days that the home is
vacant. At midnight, the holiday counter will be reduced by one until the selected number of days have passed.
The room thermostat will then return to former operation as set by the
MAN
or
AUTO
mode.
To cancel the HOLIDAY function or to exit the function at any time: press the
button a second time.
8.4
OTC heating curve
The CM737 controls the indoor temperature as a
function of the measured outside air temperature.
The heating curve is the ratio between the measured
outside air temperature and the calculated supply
water temperature.
The ideal heating curve is dependent on the type of
installation (radiators, convectors, etc.), the thermal
properties and the location of the property. A heating
curve ratio of 1 to 40 can be set. The figure shows
several heating curve ratios for a room temperature
setting of the 20°C
without
room temperature
compensation.
Su
p
p
ly
wa
te
r t
e
m
p
e
ra
tu
re
(°C)
Heat curve 10 (15:OC) has been set at the factory.
.
Outside Temperature (°C)
Heating curve ratio is at room temperature setting of 20°C
Picture 7
.
8.5
Parallel adjustment of heating curve
If any other room temperature set point than 20
o
C
is used the selected curve will be parallel
compensated.
Every change of the room temperature set point
from 20
o
C will change the supply temperature with
approximately 3
o
C. If the room temperature set
point is increased from 20
o
C to 21
o
C the supply
temperature will increase with approximately 3
o
C.
This example shows parallels of curve 10 by 19
o
C
and 21
o
C.
Sup
pl
y
wate
r t
e
m
pe
ra
ture
(°
C)
Outside Temperature (°C)
Picture 8
