Vaillant geotherm exclusive Installation Instructions Manual page 72

8 Controller
Parameters
Minimum flow temp.
Maximum flow temp.
Pre-loading time
CH run in HW mode 20r.p.m.
Max DHW load time 40r.p.m.
Compressor hyster.
Compressor starts
Max. CH return temp. HK 46°C
Delta T. T3-T7
Brine pump pre-run
Temperature fault detection after
Next service due
Table 8.7 Parameters that can be set with vrDIALOG 810/2
(cont.)
72
Description
Minimum/Maximum temperature:
Setting the limiting temperatures (min. and max.) that the
heating circuit can request.
Together with the maximum temperature, the value for
the floor protection switching is also calculated (max. HK
temp. + Compr. hysteresis + 2K).
Pre-loading time:
To take account of the inertia of the underfloor heating,
you can manually set a pre-heat before the start of the
programmed heating time.
Max. heating time = Maximum time after which the cylin-
der heating operation switches back on when there is still
a parallel demand present for the cylinder.
Max. DHW load time: = Time after which the operation
switches from cylinder loading to heating mode, when
there is a parallel demand for heating present.
Compressor hysteresis (only for hydraulic plans 1 and 3):
Forced switch-on of the compressor when:
Current flow temperature < Setpoint flow temperature -
Hysteresis
Forced switch-off of the compressor when:
Current flow temperature > Setpoint flow temperature +
Hysteresis
Comp. starts/h: max. allowable no. of compressor starts
per hour. (3-5).
Max. CH return temp. HK: Sets the return temperature
limits for compressor operation. This function should pre-
vent unnecessary short-term operation of the compres-
sor.
Delta T. T3-T7: Max. permissible difference between the
heat source inlet and outlet temperatures. An error mes-
sage appears and the compressor switches off if it is ex-
ceeded.
The function is deactivated if 20K is set.
Brine pump pre-run: Interval by which the brine pump
switches on ahead of the compressor.
Temp. fault detection: If the setpoint for the flow temper-
ature of a heating circuit is not reached after the preset
time, a corresponding error message appears in the dis-
play and the error is stored in the error list (display of the
last ten errors).
This function can be switched on or off.
Quick test. With "Next service due" ON, the time intervals
for the energy balance integral are changed from 1 minute
to 1 second and the energy balancing is thus accelerated
by a factor of 60. The minimum run time of 4 minutes
and the minimum off time of 5 minutes for the compres-
sor are unchanged.
Installation instructions for geoTHERM exclusive VWS 0020051614_00
Factory setting
15°C
43 °C
0 hrs.
20 min
40 mins
7K
3
46°C
20K
1 min
Off
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