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Firmware V1.4
20.05.2021
42/113
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5.9 Air heat pump LWP
Regulation via UA 4x0 E
If the calculated power signal reaches the switch-on threshold for the LWP, an enable is given via the relay
output 3 (terminals 35/36/38). The WRG 3010 E only issues the enable signal on the "
manual switch-off
" digital
input of the case controller UA 4x0 E, which then takes over the control for injection valve, temperatures, etc.,
see details
operation manual of case controller
Defrost LWP
The defrost can be initiated in 2 ways.
Start after expiry of a configurable time of the LWP operation.
Start via a "Manual Defrost" button in LDSWin.
The enable is withdrawn from the UA 4x0 E when defrosting starts. In addition, the calculated power signal of
HT
and
LT is reduced below the switch-off threshold of GCBP and LWP. The power signal calculation is
enabled again after completion of defrosting.
The defrost can be ended in the following ways:
The configurable defrost time expires or
the defrost termination temperature is exceeded (only if a temperature sensor has been installed in the heat
pump).
Hot gas can also be injected to accelerate defrosting. The hot gas valve at relay output 9 (terminals 1/2) is not
enabled until the GCBP valve has an opening degree of < 10%.
Another way to accelerate defrosting would be to close the hot gas valves of HT and LT. In this way, no more
heat is transferred to the building during defrosting. This can be switched on and off via a button in LDSWin.
The drip time starts after completion of the defrost.
The water that has formed during defrosting should drip off
during this time. The LWP is not enabled again until the calculated power signal has exceeded the LWP switch-
on threshold again.
LWP is an option and does not have to be present in all installations.
The prerequisite for this operating mode is that this function has been selected in the visualisation, for
details, see figure
Visualisation in LDSWin - GCBP / LWP / air conditioning operation setpoints
Содержание WRG 3010 E
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