Normal operation
46
6
(installer or TAC). For information see the Service manual.
Before accessing menus and parameters
1. Power supply switch "ON".
2. Display of the GHP10/GHP11 board showing in sequence
the detected water temperature data (if the appliance is
in normal operation), and eventually the flashing warn-
ing and error codes (if the appliance is in failure).
How to access the menus and parameters
1. Remove the display transparent cover (detail I Figure
p. 10) by removing the four fixing screws.
2. Press the
key once to display the menus: the first
menu is displayed, "0." (= menu 0).
3. Press the
to scroll down and display the other/sub-
sequent menus; the menu numbers will be displayed in
order, "1.", "2.", ... , "6." ... or "E" (= exit).
4. Select the menu of interest (e.g. display "2.___" = menu
2) by pressing the
key; the first parameter code will
be displayed, in order in the menu (e.g. display "2._21" =
parameter 21 in menu 2).
5. Press the
to scroll down the other parameters in the
menu; the codes will be displayed in order (e.g. display
"2._21", ... "2._26" = parameters 21, ... 26 in menu 2), or
letter "E" (= exit) at the end of the list.
6. Edit the parameter of interest by pressing key
the dis-
play will show the current parameter value (blinking) or,
for a command menu, a blinking code (eg. "rEr1" for the
board error reset command).
7. Press the
key to reconfirm the figure; or use
and
keys to modify the figure, and press
at the end to
confirm or set the new figure; if however, it is a matter of
controlling an appliance operation, press the
key to
execute it.
8. To exit a parameter menu or the menu list and go back to
the higher level, press the
until displaying the letter
"E" for exit, then press the
key again.
9. The water temperature values alternate again on the
display: output, input and the difference between them.
10. Fit the display transparent cover.
Table 6.1
Menu 3 parameters (for the user)
Parameter
Description
Setting
Default
44
Temperature display format
0. °C
1. °F
0
48
Building time constant
from 0 to 50 hours
10
163
Antifreeze function
0. not active
1. active
1
198
Fan noise reduction
0. not active
1. active
0
225 (1)
Setpoint source
0. Fixed setpoint
1. heating curve
1
226 (1) (2)
Fixed setpoint in heating operation
The minimum and maximum values depend on what has been set in the instal-
lation stage.
227 (3)
DHW setpoint with closed COM-DHW contact
from 10 °C to 80 °C
55
228 (1) (4)
Heating curve slope
from 10 to 400
75
229 (1) (4)
Heating curve offset
from -5 K to +5 K
0
230 (1) (4)
Room setpoint with heating curve
from 0 °C to 40 °C
20
235 (1) (5)
Differential for DHW buffer tank charge start
from 1 K to 10 K
5
237 (1) (5)
DHW setpoint with open COM-DHW contact
from 0,1 °C to 80,0 °C
0,0 DHW charge disabled with COM-DHW contact open
0,0
1
If the unit is connected to the OQLT021 system controller (optional) this parameter is ignored.
2
This parameter is ignored if parameter 225 is set to 1.
3
When the K18 appliance directly manages DHW production, parameter 227 represents the setpoint in the DHW buffer tank when COM-DHW contact is closed and is used in conjunction
with parameter 237. If the K18 appliance does not directly manage DHW production, parameter 227 represents the setpoint of the delivery water temperature (or return, depending on the
value of parameter 220) of the K18 appliance.
4
This parameter is ignored if parameter 225 is set to 0.
5
This parameter is ignored if the appliance does not directly manage DHW production.
6.6
MODIFYING SETTINGS
Do not modify complex settings
Specific technical and system knowledge is required for
complex settings. Contact a TAC.
The settings described in this section does not apply
when using the OQLT021 system controller. Refer to the
system controller installation manual for detailed in-
structions about its settings.
6.6.1
How to modify the heating curve
This kind of regulation is active if parameter 225 (menu
3) is set to value 1 (default).
The heating curve makes it possible to change the system's out-
let water temperature according to the measured outdoor tem-
perature and to the internal ambient setpoint temperature.
Depending on the type of installation, especially on the type of
exchangers (radiators, fan coils, floor radiators etc.) and the fea-
tures of the building, a specific curve will be used, selected from
the family of heating curves. Furthermore, upon changing the
internal room setpoint temperature, the curve actually used will
be automatically modified.
The family of heating curves is shown in Figure 6.1
p. 47 and
the curve to be used is chosen by specifying the value of param-
eter 228 in menu 3 which indicates the curve slope. The curve
defined in this way refers to an internal ambient setpoint tem-
perature of 20 °C (68 °F). If the setpoint temperature is different,
the system automatically adapts the curve used.
To set the adequate heating curve operate as specified
below:
