Wolf CGB-100 - Operation Without Low Loss Header; System Pressure and Temperature Limits; Heating Water General Requirements

18 3062555_201804
10.Installation
Note:
Provideadrain&llvalveatthelowestpointinthesystem.
InformationfromVDI2035
The way in which commissioning in particular is carried out
canhaveastronginuenceonscaling.Heatthesystematthe
lowest output with an even and adequate throughput. For mul-
ti-boiler systems it is recommended to commission all boilers
simultaneously to prevent the overall amount of lime concen-
trating on the heat exchanger surface of an individual boiler.
The minimum system pressure is 1.0 bar.
The gas condensing boiler is approved exclusively for sealed
systems of up to 6 bar. The maximum ow temperature is
factory-set to 80 °C and may be adjusted to 90°C if required.
Generally,theowtemperatureis80°CforDHWoperation.
Safetyequipment
Generalrequirements
Thereisariskofdamagetotheboilerresulting
fromwaterleaks,poorheattransferorcorro-
sion.
- Before connecting the gas condensing boiler, ush the
heating system to remove residues such as welding pearls,
hemp, putty, sludge sediments, etc. from the pipework
- Install a strainer/dirt trap in the return line and service the
strainer/dirt trap at regular intervals, see WOLF accessories
(500μm=0.5mm)
- The automatic air vent valve for the appliance must be
opened during operation
- Themax.owrateof100l/min(6000l/h)mustnotbeex-
ceeded
- Drinking water or desalinated domestic drinking water should
beusedasllwaterandtop-upwaterThehardnessofthe
systemwatermustbelessthan2dH.Thellandtop-up
waterqualitiesforthespecicsystemcanbefoundinthe
chapter “Technical information for water treatment”.
- If an ingress of oxygen cannot be ruled out, a system sep-
aration is advisable
- TheheatingwaterpHvaluemustbebetween8.2and8.5
- Ingeneral,llandtop-upwatermustbedesalinated;soften-
ing by means of a single stage de-ioniser is not permissible.
For this, the permissible methods and limits should be
obtained from the chapter “Technical information for water
treatment”(NOTEthelimitvaluesarespecictothesystem).
- Inhibitors and antifreeze are not permissible.
- A system log must be kept (see Technical information for
water treatment)
Aftercorrectllingofthesystem,thesystemmustbeheatedup
tothemaximumlevelandthenthetotalhardnessandpHvalue
must be measured again and adjusted as necessary. These
values must be checked and adjusted again after 6-8 weeks.
Heatingwater
Themaximumowratemustnotexceed
6000l/h(100l/min).
carryoutaleaktestonthepiping:
Testpressureonheatingwatersidemax.8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6bar.
Iftheapplianceisnotwatertight,thereisarisk
ofleaksandresultingmateriallosses.
Additionalrequirementsforoperationwithoutalowloss
header
- Systems with only one CGB-75/100
- Sludge separator in the boiler return of the CGB-75/100
- Desalinationoftheheatingwaterto2-3°dH
- Control of cylinder charging only via the MM module (con-
gurations1and10)
- Cylinder charging pump at least DN 25 with at least 6 m
head
- Themax.owtemperaturemustbeadjustedwithparameter
HG08to75°C
Thetechnicalinformationforwatertreatment
mustbeobserved,otherwisesystemdamage
duetowaterleaksmayoccur.
The manufacturer does not assume liability for any damage
to the heat exchanger caused by oxygen diffusion in the heat-
ing water. In the event of oxygen penetrating the system, we
recommend a system separation through the interconnection
of a heat exchanger.
For a specic system volume of >50 l/kW, adjust the total
hardnessto2-3°dHusingadesalinationprocess.