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We reserve the right to make technical changes.
83052300eUK © ait-deutschland GmbH
2.1
NOTICE
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.
The cooling is controlled via the return sensor.
Error Error
with 2hg = in the event of a fault in the heat pump,
connected 2 hgs are energised according to require-
ments (HW + SW)
no 2hg = in the event of a fault in the heat pump,
connected 2 hgs are only energised if the return
temperature < 15 °C (antifreeze); (only heating)
Service water 1 Domestic hot water 1
Sensor = Domestic hot water preparation is initiated
or terminated via a sensor on the domestic hot
water tank
Thermal = Domestic hot water is initiated or termi-
nated via a thermostat on the domestic hot water
tank
NOTICE
Connect domestic hot water thermostat on the
same terminals 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 requirement.
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 operat-
ing manual intended for end customers, found in
program section “Domestic hot water” under the
section entitled “Circulation”.
h.w.CP = Setting h.w.CP means that the CP output
will be active during domestic hot water prepara-
tion and switch off 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 tempera-
ture
Service water 5 Domestic hot water 5
with HSP = Heating circulation pump runs during
domestic hot water preparation
wo HSP = Heating circulation pump does not run
during domestic hot water preparation
SW+HP max Maximum running time
domestic hot water preparation + Heat pump
After the set time has expired, the 2nd heat genera-
tor 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
Option only possible for L/W devices:
You can nd the time to be set for the relevant L/W
device in the operating instructions. If you do not
nd any data there, the following applies:
page 77, „Overview: Defrost cycle, Air defrost,
Flow Max“
Defrost. Air. Air defrost
Option only possible for L/W devices:
No = Air defrost not released
Yes = Air defrost generally released above the set
temperature
Approved appliances, see page 77, „Overview:
Defrost cycle, Air defrost, Flow Max“
ATTENTION
Do not set an “air defrost” on non-approved appli-
ances.
Defr. Air max Maximum duration of air defrost
Option only possible for L/W devices and if air de-
frost is released
Defrost 2
Option only possible for L/W devices with 2 com-
pressors
with 1 CP = Defrost with only one compressor
with 2 CP = Defrost with two compressors, if these
also supply before defrosting
Pump opt. Pump optimisation
No = Heating circulation pumps always run, unless
another supply type is requested (domestic hot
water, …) or the device is switched off
Yes = Heating circulation pumps are switched off, if
required
The heating circulation pumps will be switched if the
heat pump has not been requested for more than 3
hours. The heating circulation pumps will then cycle
for 5 minutes every 30 minutes until the heat pump
receives another request.
If the external temperature is above the return set-
point temperature, the heating circulation pumps
will be switched off permanently. They will be
switched on for 1 minute every 150 hours to pre-
vent them from becoming stuck.
Access Data access authorisation
The “Fitter” (= Qualied technicians) provides
access to parameters without a password, which
otherwise requires “Customer service” access.
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