Monitoring Functions
Leakage District Heating:
Forward and Return flows are monitored continuously, compensating for
volume and meter differences. If a preset flow difference limit is
exceeded, leakage alarm is issued and the installation is cut off.
Seepage District Heating: OptiTight®
The patented OptiTight® mechanism employs
individual control of the cut-off valves to test the installation tightness one or more
times daily, whereby even minute seepage may be detected.
Leakage Supply Water:
The System permits the continuous discharge of a preset amount
of water. If this amount is surpassed in a single discharge,
a Max Alarm is issued, and the water supply is cut off.
Seepage Supply Water:
The system checks that water flow in the installation can drop
and remain below a preset level for a preset time duration,
and will issue a seepage alarm and cut off the water supply
if this fails to occur daily.
Supply Error:
The system monitors the mains supply and all internal supplies.
If either of these fail, a Supply Error is issued. This may not
cause a cutoff of water supply or heating installation.
System Errors:
The system checks that the supply water flow meter issues impulses regularly,
unless the Holiday function is active.
The system checks Forward and Return flow meters against each other, whereby
meter blocks and occurring defects are immediately discovered.
Whenever any valve is closed - manually or by alarm -
the system checks its tightness.
If a component fails, a System Error is issued, and the relevant installation
is cut off.
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1: Control Unit
3: Forward flow meter
5: Return cutoff valve
7: Water flow meter
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2: Forward cutoff valve
4: Return flow meter
6: Non-return valve
8: Water cutoff valve
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Alarm Functions
On Leakage and System errors, system Combi will cut off the affected installation,
issue visible and audible alarms and activate the relevant alarm relay.
Supply errors are reported via the alarm relays, and possibly also
visibly and audibly.
Specifications
Controls and Indicators:
Mains, Flow, Forward, Return, Valve and State indicators, buzzer.
Buttons for manual valve control water/heating, temporary free discharge selector,
holiday function and alarm acknowledge water/heating.
Leakage monitor DH:
Base measuring period 210 sec.
Truncation at 32 litres forward volume.
Tolerable flow difference Forward-Return in measuring period 5 ltr.
Seepage DH OptiTight®:
Activation: 1, 2, 3, or 4 times daily.
Base time 02:00 + 24 / 2*12 / 3*8 or 4*6 hours.
May be delayed up to 1 hour if consumption is high.
Duration: 7.5, 15, 30, or 60 minutes.
Sensitivity up to 3 liters/hour.
Leakage monitor SW:
Permissible single discharge selectable 125, 250, 500, or 1000 litres.
Flow minimum to terminate discharge 15 l/h.
In holiday mode, permissible single discharge is 20 litres regardless of setting.
Free discharge duration 1 hour maximum.
Seepage monitor SW:
Seepage tolerance 2, 4, or 8 litres in 30 or 60 minutes.
Observation interval 24 hours.
Mains connection
230V 50Hz L/N/PE via external key switch.
Power consumption max 20VA.
Options
Liquid Sensor Attachment:
Systems CB/B and CB/X accommodate via interface ILS-C a Liquid Sensor
type LS-X, whereby the system offers point protection of
a particularly sensitive area so that the water supply or
heating installation may be cut off on Liquid Sensor alarm if desired.
SMS-alarm:
By attachment of an external SMS-alarm to the alarm relay output,
systems CB/B and CB/X can ship a text message to a selected mobile phone number.
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