Full effect geothermal heating
Alarms:
The ”Electric heat” alarm goes off when the electrical heating resistor switches on (10s delay) .
: the temp of the accumulator's upper part exceeds 95°C, an “Overheat” alarm is given; (the alarm disappears when
the temperature drops below 85°C)
Measurement 4
: If the controller has given the compressor a running permit but measurements does not receive running
information, a ”CompressorRun” deviation alarm is given and the controller deletes the compressor's running permit. The compressor
tries to restart after 5 minutes and after that at 60 minute intervals if the electrical heating resistor is not on. If the compressor starts
up, it has to remain running for at least 2 minutes so the compressor alarm is deleted. An alarm can be caused by:
- the overcurrent protection of the overpressure pressostat, compressor or geothermal heating pump (acknowledged by the
electricity distribution cabinets) or
- the low pressure pressostate ( acknowledged by the pressostat).
Measurement 9
26
GeothHeatFull
AccumUpperMin55
AccumUppHyst
6
ElHeatUppHyst10
AccumLowerMin40
AccumLowHyst
6
Measurement 9 gives the compressor a running command because the temperature of measurement 9 is below
[
”
(“
)]
The compressor stops running because the temperature of measurement 9 is above the [
(”
] setting
the temperature of measurement 10 is above the [
+5]
above [
”]
“AccumUpperMin
AccumUppHyst”/2
“AccumUpperMin”
AccumUppHyst"/2
controller indicated H1 supply water temp
“AccumLowMin
AccumLowHyst
-
+
and
and
+
*2)
*4)
*1)
An example of automatic control
:
Measurement 10 gives the compressor a running command because the temperature of measurement 10 is below “
”
The electrical heating resistor can switch on after an hour because the temperature of measurement 9 is below the
[
”
(“
/2)
”] temperature
The compressor switches off and the electrical heating resistor switches on because the conditions for the electrical heating resistor to be on
are met and during an hour's time the temperature of measurement 10 has not risen 1° C while the compressor has been running.
The electrical heating resistor is switched off because the temperature of measurement 9 is above the [”
”
(“
/ 2)]
setting and above the [
5]
AccumLowMin
”AccumUpperMin
AccumUppHyst”
”ElHeatUppHyst
AccumUpperMin
AccumUppHyst”
controller indicated H1 supply water temp
-
-
-
+
*5)
*6)
*3)
Electrical heating resistor
is switched on
*5)
1
hour
Compressor is
switched on
*1
)
“AccumUpperMin”
“AccumUpperMin” - (”AccumUppHyst”/2)
The controller indicated temp. of H1
supply water + 5 - "AccumLowHyst"
“AccumLowerMin”
“AccumLowerMin” + “AccumLowHyst”
*2)
AccumUpperMin” - (”AccumUppHyst”/2) -
“ElHeatUppHyst”
“AccumUpperMin” + (”AccumUppHyst”/2)
The controller indicated temp.
of H1 supply water
20
45
51
55
60
58
52
42
21
*3)
*6)
11
The controller indicated temp. of H1
supply water
- “ElHeatUppHyst”
*2)
*4)
Attention! The compressor and the heating resistor cannot be on at the same time!
-
-
-
-
-
-
-
-
-
-
°C
Time
M
ea
s.
9
M
ea
s.
10
Geothermal heating unit control using factory settings. The outdoor temperature at the time of inspection is +20° C and the controller indicated
supply water temperature is 21° C.
53
Max. limit of the accumulator's lower part
*1
)
Compressor is
switched on
Compressor is
switched on
The controller indicated temp.
of H1 supply water + 5
26
