Wolf BWL-1S-07 - Dirt Trap; Dew Point Monitor (DPM); DHW Cylinder; Buffer Cylinders

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Connectingtheheating/DHWcircuit
17.1.12 Dirttrap
Toprotecttheheatpump,adirttrapmustbeinstalledintheheatingreturn.Installingdirttraps
orcarryingoutanyothermodicationsinthesupplylinetothesafetyvalveisnotpermitted.
WOLFrecommendsasludgeseparatorwithmagnetiteseparatortoprotecttheapplianceandthe
highefciencypumpfromdirt/sludgeandmagnetite.
17.1.13 Dewpointmonitor(DPM)
Adewpointmonitor(accessory)isrequiredforareacoolingsystems(e.g.underoorheatingcircuit,
cooling ceiling). If the cooling circuit serves several rooms with different relative humidities, several dew
pointmonitorsmustbeinstalledandconnectedinseries.Themonitorsarettedtothecoolingcircuit
owintheroomtobecooled.Removethethermalinsulationfromthisarea.
You can set the dew point monitor switching point to between 75 % and 100 % relative humidity using a
potentiometer (factory setting is 90 % rh).
If required, the dew point monitor can be installed directly on the indoor unit. In this case, the switching
point must be reduced slightly, e.g. 85 % rh instead of 90 % rh.
17.1.14 DHWcylinder
- The DHW cylinder must be equipped with an internal indirect coil suitable for the heating output of
the heat pump.
- The internal indirect coil should have a surface area of at least 0.25 m² per kW of heating output.
- Thepipeworkmustbesufcientlylarge(>DN25).
17.1.15 Buffercylinders
Sincevariableowratescanariseontheheatdraw-offsidedependingontheload,theminimumow
rate must be ensured to enable fault-free heat pump operation. This is usually achieved by installing a
separating buffer cylinder or a low loss header.
Abuffercylinderisessentialforallsystemswithradiators,individualroomcontrol(thermostaticvalves),
multipleheatgeneratorsorheatingcircuits.ThisalsoappliestosystemswiththeauxiliaryPV
increasefunctionorSmartGridforheatingmode.
Forcorrectoperation,defrostenergyisrequiredfromtheheatingsystem.Thisisensuredusing
abuffercylinderwithacapacityofatleast35l.Ifinsufficientdefrostenergyisavailable,system
faultsoccurandincreaseduseoftheelectricimmersionheaterresults,inordertosuccessfully
completedefrosting.
Forair/waterheatpumpswithoutput-dependentcontrolinconnectionwith100%underoorheating,
there is no need to use a buffer cylinder, provided the following conditions are met:
Theminimumowrateviatheheatingsystemmustbeensuredpermanentlybyfullyopeningmultiple
lines(writtenuserconsentrequired).Forthis,theminimumowratemustbeveriedbymeansofa
pressure drop calculation.
Ifnecessary,multipleheatedheatingcircuitscanbespecicallyopenedfullyviaoutputA1duringdefrost
mode. The valve opening time must be < 20 sec.