24 We reserve the right to make technical changes | 83055600dUK – Translation of the original instruction manual (HMD 2) | ait-deutschland GmbH
NOTE
Connect domestic hot water thermostat on the same ter-
minals as the domestic hot water sensor (low voltage). The
domestic hot water thermostat must be suitable for low
voltage (oating contact).
Thermostat closed (= signal On) = Domestic hot water re-
quirement.
Service water 2
Domestic Hot Water 2
CP Setting CP means circulation pump.
For the corresponding settings, please refer to the description
of the circulation pump in the operating manual part 1, pro-
gram section “Domestic hot water”, section “Circulation“.
h.wCP Setting h.w.CP means that the CP
output will be active during domestic
hot water preparation and switch o
30 seconds after domestic hot water
preparation is complete.
Service water 3
Domestic Hot Water 3
with CP Additional circulation pump runs
during domestic hot water preparation
wo. CP Additional circulation pump does
not run during domestic hot water
preparation
Service water 4
Domestic Hot Water 4
set value Heat pump attempts to reach the set
setpoint value of the domestic hot
water temperature
Service water 5
Domestic Hot Water 5
with HSP Heating circulation pump runs always
during domestic hot water preparation
wo HSP Heating circulation pump does not run
during domestic hot water preparation
par. HUP Heating circulation pump runs parallel
to domestic hot water preparation
if a heating demand exists. If the
heating limit is exceeded, the heating
circulation pump switches o.
SW+HP max
Maximum running time domestic hot
water preparation + Heat pump
After the set time has expired, the 2nd heat generator in the
domestic hot water preparation energises, but only if this has
been released previously in the heating mode!
Defr cycle max
Defrost cycle time, maximum time
between two defrost processes
You can nd the time to be set for the relevant L/W device in
the operating manual.
Defrost. Air
Air defrost
No Air defrost not released
Yes Air defrost generally released above
the set temperature
Defr. Air max
Maximum duration of air defrost
Option only possible if air defrost enabled
pump opt.
Pump optimisation
No Heating circulation pumps always
run, unless another supply type is
requested (domestic hot water, …) or
the device is switched o
Charge Mixer serves as charger mixer, possibly
for a boiler
A Boiler
B Heat pump
TB1 sensor ow
Discharge Mixer serves as a control mixer,
possibly for oor heating
TB1 sensor ow (mandatory)
Cool Activation of the cooling function (only
LWD reversible active)
If a mixer is present, it then serves as a
control mixer for the cooling function
No Mixer without function
NOTE
For reversible LWD MK1 can also be set to “Hz+Cool” or
“Cooling” without the expansion board by using the tter
or customer service access. Cooling is controlled via TB1
sensor (via TVL sensor with bridged TB1 contact) for inte‑
gration of “Return” or via TRLext sensor for integration of
“Sep.tank”.
Error
Error
no 2hg in the event of a fault in the heat pump,
connected ZWE are only energised
if the return temperature <15 °C
(antifreeze); (only heating)
Heating
DHW Domestic hot water
with 2hg in the event of a fault in the heat
pump, connected ZWE are energised
according to requirements (HW +
DHW)
Service water 1
Domestic Hot Water 1
Sensor Domestic hot water preparation is
initiated or terminated via a sensor
with hysteresis (factory setting: 2K) in
the domestic hot water tank.
Thermal Domestic hot water preparation is
initiated or terminated via a thermostat
on the domestic hot water tank.
No temperatures can be set in the
controller
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