21
Example for default parameters with no correction for underfloor heating.
Comp off
EH1 On
EH1 Off
EH2 On
EH2 Off
20
22
24
26
28
30
32
34
36
38
40
Se
tpo
in
t
H
Er
B
ef
o
re
C
o
rr
ec
tion
°
C
-20
-15
-10
-5
0
5
10
15
20
25
OAT Outdoor Air °C
3.
time
the First stage will only start after the compressor has been on for 10 minutes. the second stage can
only start 15 minutes after the first stage.
4.
room temperature
the electric heaters will switch off when the room temperature reaches setpoint. note that the
compressor switch off temperature is higher.
5.
rate of increase of water temperature
during the first ten minutes of compressor and continuously afterwards the rate of increase of the
temperature of the water is calculated. if this rate of increase is low or negative then the electric
heaters are allowed to start.
Exceptions to the above rules.
1.
if the emergency heat switch is on then only the water temperature rules are used with a higher setpoint.
2.
if certain types of alarm prevent the compressor to start the electric heat is allowed to start but will use
the indoor room temperature and will only allow a low setpoint. in this case the user should switch
to emergency heat mode. this mode is only possible when the room terminal is used.
3.
below the cut-off point given by the parameter h23 the compressor will stop, only the electric heaters
will then operate. default setting = -20°c.
