16 We reserve the right to make technical changes | 83055600dUK – Translation of the original instruction manual (HMD 2) | ait-deutschland GmbH
Query outputs
The menu is not shown in full here.
NOTE
If 2 heat pumps are connected, note the number displayed in
the top menu row. It provides information about which heat
pump is currently addressed.
In order to change the addressed heat pump: page 11,
“Changing the addressed heat pump in submenus“
Defrost demand Defrost request
dv-defrost valve Valve / Circuit reversal
ON = Thaw mode or rather cycle
reversal becomes active
DHW pump Domestic hot water circulation pump
Floor heat. pump 1 Floor heating circulation pump
heat. sys. pump Heating circulation pump
mixer 1 Open Mixer 1 opens
On = opens / O = no control
mixer 1 Close Mixer 1 Close
On = closes / O = no control
Ventilation Ventilation of the heat pump housing
Fan-heats. pump Ventilator, well or brine circulation
pump
Compressor Compressor(s) in heat pump
Compressor 1 Compressor 1 in heat pump
Compressor 2 Compressor 2 in heat pump
CP Circulation pump
suppl. pump Additional circulating pump
2nd heat gen. 1 Second heat generator 1
2nd heat gen. 2 Second heat generator 2– Collective
fault (function collective fault:
Continuous ON in the event of a fault,
cycles 1x per second with automatic
RESET enabled)
AO … Analogue output … (power supply e.g.
for ow sensor)
Comp-Heater Compressor heating
Control signal UWP Circulation pump output in %
RPM Ventilator Current speed of the heat pump’s fan
RPM Compressor Current speed of the heat pump’
compressor
EVi opening Enhanced vapour injection, opening
EEV opening Electronic expansion valve,opening
EEV heating Electronic expansion valve, heating
EEV cooling Electronic expansion valve, cooling
Undercooling EEV Calculated under-cooling at the
electronic expansion valve
THG Grenze Maximum hot gas temperature
Defrost End Target temperature in the evaporator
to end defrosting
desuperheater Temperature at the desuperheater
Switch box Temperature in the electrical switch
box
Query inputs
The menu is not shown in full here.
NOTE
If 2 heat pumps are connected, note the number displayed in
the top menu row. It provides information about which heat
pump is currently addressed.
In order to change the addressed heat pump: page 11,
“Changing the addressed heat pump in submenus“
NOTE
This menu shows whether the digital inputs of the control-
ler are switched on or o.
Defr/Brin/Flow Defrost, Brine pressure, ow
On = Flow okay.
SW-therm. switch Domestic hot water thermostat
On = Domestic hot water requirement
Energy supply company O-time of the electrical supplier
O = O-time
High pressure High-pressure pressostat
O = Pressure okay
Motor protect. Motor protection
On = Motor protection okay.
Low pressure Low pressure pressostat
On = Pressure okay.
potent. ext. Connection of an external current
anode (possible for some devices)
Analog In … Analogue input signal (e.g. for ow
sensor)
release cooling ON = cooling enabled (from external)
present
High pressure High-pressure sensor
Low pressure Low-pressure sensor
ow Heating circuit ow rate
Smart Grid 1 EVU blocking time
2 decreased operating mode
3 normal operating mode
4 increased operating mode
page 30, “Operating states“
El. Sup. bl. 2 Additional energy supplier (EVU) signal
for displaying the Smart Grid states
STB E-Rod Safety temperature limiter (STB)
for monitoring the electric heating
element
ON = STB OK
OFF = STB has triggered
EVI pressure Pressure, EVI pressure sensor
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