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NexPolar ME Bus
Function
Parameter Description
External heat source
148
air temperature limit
Temperature list
149
Auxiliary outdoor air
150
temperature limit
Auxiliary delay
151
Auxiliary hysteresis
152
Domestic hot water
153
in off mode
Status of external
154
heat source
Main water pump vs
external heat source
155
status
Electric trace heater/
additional water
156
pump
Additional water
157
pump
Delta air set point
158
Table of factory parameters and functions
Function
Parameter Description
Unit configuration
302
All manuals and user guides at all-guides.com
This code is used to set the outside air temperature threshold value below
which only the external heat source will be operative as per algorithm.
(Heat Pump Stop)
Code used to set which temperature the control panel should display in
the temperature zone.
1. Indoor air temperature
2. Outlet water temperature (from LWT sensor)
3. N.A.
4. Refrigerant temperature (from TR sensor)
5. Suction temperature (from TS sensor)
6. Discharge temperature (from TD sensor)
7. Refrigerant temperature (from TE sensor)
This code is used to set the outside air temperature threshold value below
which both the heat pump and the external heat source will be operative
as per algorithm.
This code is used to set the delay time after which, when (temperature set
in code 148) < Outside Air Temperature < (temperature set in code 150), the
external heat source will switch on.
The counting of the time starts when the activation of the external heat
source is required as per algorithm.
This code is used to set the hysteresis temperature needed to activate the
external heat source.
Code to establish whether, when the system is in off mode, the domestic
hot water production logic can be activated:
1. Yes, the domestic hot water logic is always active
2. No, the domestic hot water logic can be activated only in Heating or
Cooling mode
Code used to establish the status of the external heat source when this
later is activated and the outside air temperature is below the tempera-
ture value set with parameter 148:
0. Always active
1. On/Off depending by actual room temperature vs room temperature
set-point (same hysteresis of the thermostat function). If the command
is not installed or the room sensor is unavailable, On/Off depends on the
water set-point (+1/-4 °C of hysteresis)
2. On/Off depending on the water set-point (+1/-4 °C of hysteresis).
This code is used to define the water pump logic when the external heat
source is activated and the outside air temperature < temperature value
set in Code 148
0. Always off
1. On/Off depending on the On/Off status of the external heat source
2. Always on
Code used to select the output connected to PIN 12 on the terminal board. In case an
additional water pump option is active, this code is used to select its operating sy-
stem with respect to the domestic hot water request (ACS) (if outside air temperature
> (temperature value set with Code 148).
0. Electric heat tracing installed for the antifreeze system
1. Additional water pump On/Off depending on the main water pump logic. This means
that if the DHW is on, the additional water pump is ON.
2. Additional water pump On/Off depending on the main water pump logic, but always
OFF when the DHW is on.
This code is used to establish the additional water pump, if it has been
installed, when the outside air temperature < temperature value set with
Code 148:
0. Always off
1. On/Off depending on the On/Off status of the external heat source
2. Always on
Code used to establish the hysteresis with respect to the ambient tem-
perature set point to switch off the unit when control panel system is
installed and used as a thermostat (100 control panel code = 4).
This code is used to configure the unit:
0. Cooling only
1. Heating and cooling
2. Heating only
58
Value range
Default value
Set value
Min
Max
-20°C
65°C
-20°C
1
7
1
-20°C
30°C
0°C
1 Min 60 Min
10 Min
1°C
20°C
5°C
1
2
1
0
2
1
0
2
1
0
2
1
0
2
2
0.2°C
1°C
0.3 °C
Value range
Default value
Set value
Min
Max
0
2
1
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