Wolf COB - Installation - General

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10 Installation-general
Note:
Provide a drain & ll valve at the lowest point in the system.
The COB has not been tted with an expansion vessel at the factory. This must be tted
externally (available from the Wolf accessories range). The expansion vessel must be
sized sufciently, in accordance with DIN 4807.
Thereshould not be a shut-offvalvebetween the expansion vessel
andtheoilcondensingboiler,becauseotherwisethepressurebuild-up
wouldpermanentlydamagetheboilerduringheating.Thereisariskof
systemcomponentsrupturing,givingrisetoariskofscalding.
This does not include buttery valves upstream of the expansion vessel. The safety
assembly from the Wolf accessories range includes an integral 3-bar safety valve. Route
the discharge pipe into a drain outlet.
The minimum system pressure is 1.0 bar.
The oil condensing boiler is permitted exclusively for sealed systems of up to 3 bar.
The maximum ow temperature is factory-set to 75°C and may be adjusted to 90°C if
required. In DHW mode, the max. ow temperature is factory-set to 80°C and may be
adjusted to 90°C if required.
It is only possible to refrain from using a minimum flow rate at
temperatureslowerthan80°C,topreventdamagetotheheatexchanger
fromoverheatingandsteamknocking.
Thereturnlinetotheappliancemusthaveadirttrap.Asludgeseparator
withmagnetiteseparatorshouldbeusedtoprotecttheapplianceand
thehighefciencypumpfromdirt/sludgeandmagnetite.
Depositsintheheatexchanger mayleadtoboilingnoise,adropin
performanceorfaultsintheappliance.
Before commissioning,carryout a tightness test on all hydraulic
pipework:
Iftheapplianceisnotwatertight,thereisariskofleaksandresulting
materiallosses.
Testpressureontheheatingwatersidemax.4bar
Priortotesting,closetheshut-offvalvesintheheatingcircuitforthe
appliance,becauseotherwise,thesafetyvalve(accessory)opensat
3bar.Theappliancehasalreadybeentestedatthefactoryfortightness
at4.5bar.
Themaximumowratemustnotexceed6000l/h(100l/min)
Safetyequipment
Note
Note
Hydraulics
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