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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 / Off = no control
mixer 1 Close
Mixer 1 Close
On = closes / Off = 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 flow 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 off.
Defr/Brin/Flow
Defrost, Brine pressure, flow
On = Flow okay.
SW-therm. switch
Domestic hot water thermostat
On = Domestic hot water requirement
Energy supply company Off-time of the electrical supplier
Off = Off-time
High pressure
High-pressure pressostat
Off = 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 flow
sensor)
release cooling
ON = cooling enabled (from external)
present
High pressure
High-pressure sensor
Low pressure
Low-pressure sensor
flow
Heating circuit flow 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
