52
AWR-MTD2-XE
EN 11/2010
CONTROL AND OPERATING CHARACTERISTICS
U I A
Heat pump operation with fixed set point
System water set point compensation using the compensa-
tion curves can be disabled.
To enable fixed set point operation, set parameter 0152=0
and 0154=0
The heat pump will operate based on the fixed return set
point defined by parameters 0153 (Heating) and 0155 (cool-
ing).
Description
Enable return set point in
HEATING
0= Fixed set point in heating
ENABLED
1= Fixed set point in heating
DISABLED
Fixed return water temperature
set point in HEATING
Enable return set point in
COOLING
0= Fixed set point in cooling
ENABLED
1= Fixed set point in cooling
DISABLED
Fixed return water temperature
set point in COOLING
Menu
Mn01
Mn01
Mn01
Mn01
Parameter
no.
0152
0153
0154
0155
Default
0
40
0
12
UOM
-
°C
-
°C
FROST PROTECTION
Frost protection based on system water temperature
The frost protection function is active even if the controller is
in standby. To prevent the water freezing and damaging the
plate heat exchanger, the microprocessor shuts down the
compressor and activates the system heat exchanger
heater if the temperature measured by the heat exchanger
outlet temperature probe is than +4°C. The frost prevention
temperature set point can only be modified by an authorised
service centre, and only after verifying that the water circuit
contains antifreeze. Tripping of this alarm shuts down the
compressor but not the pump, which remains active.
To reset normal operation, the water outlet temperature
must rise to more than: +7°C on the system side. Reset is
automatic.
Frost protection based on inside temperature
Frost protection on the heating circuit is always active, even
when the heat pump is off.
The heat pump and/or supplementary sources of heat (out-
let heater or boiler) are activated if the room temperature
falls below the value set for parameter 0140, to prevent the
pipes inside the home from freezing.
Outside air T
OFF
ON
Heat pump
0140 Inside temperature
1°C
Description
Inside temperature to enable frost
protection
Menu
Mn01
Parameter
no.
0140
Default
14
UOM
°C
Frost protection based on outside air temperature
Frost protection on the heating and domestic hot water cir-
cuits based on outside air temperature is always active,
even when the heat pump is off.
The system and domestic hot water pumps are activated
when the outside air temperature falls below the value set
for parameter 0141.
Outside air T
OFF
ON
System and DHW
circuit water pump
0141
Outside air temperature to enable frost protection
1°C
Description
Outside temperature to enable
frost protection
Menu
Mn01
Parameter
no.
0141
Default
4
UOM
°C
Summary of Contents for AWR-MTD2-XE
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