sauter equitherm EQJW245, Руководство по эксплуатации

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EQJW245
Commissioning
Intervention level if the return temperature limit of control circuit 1 is exceeded.
If the limiting function that has been defi ned with SP23-SP27 for the return
temperature at T
RF1
is exceeded, the fl ow temperature setpoint is reduced by the
value specifi ed in SP25 for each degree by which the temperature exceeds the
setpoint (controlled with the aid of V1). With maximum return temperature limiting
(SP13 = 1), the function intervenes when the temperature drops below the return
temperature limit. If return temperature maintenance has been parameterised
(SP13 = 2), the function intervenes when the temperature drops below the return
temperature limit.
Maximum limit values for quantity metering
SP26, SP27 and SP28 specify maximum limit values for quantity metering (i.e.
usually for the fl ow or heat quantity/power). SP26 defi nes the maximum limit
value for heating and domestic water, SP27 only defi nes this value for the heating
and SP28 only defi nes it for domestic water. The value is always entered in units
of ‚pulses per minute‘.
See the following examples of converting the limit value for the fl ow volume or
power to the ‚Pulses per minute‘ variable.
Example 1:
The fl ow volume should be limited to 1.6 m³ / hour.
The fl ow sensor transmits a signal of 50 pulses / litre.
The following conversion: 1.6 m³ / hour = 1,600 litres / hour and 1600 litres / hour
= 26.67 litres / minute, and the fl ow sensor variable of 50 pulses / litre, give a
limit value that must be entered on the EQJW245 (SP26, SP27 or SP28) of 26.67
litres / min x 50 pulses / litre = 1333 pulses / min.
Example 2:
The power in heating mode should be limited to 35kW. With simultaneous heating
operation and domestic water heating, 50 kW should be allowed. A heat quantity
meter is available which outputs 1200 pulses / kWh.
The following conversion: 35 kW = 35 kWh / h and the given variable for the
heat quantity meter provide 35 kWh / h x 1200 pulses / kWh = 42,000 pulses / h.
This gives a value that must be entered on the EQJW245 of 42,000 pulses / h =
42,000 : 60 pulses / min = 700 pulses / min. The second limit value is 50 kW. The
same conversion: (50 kWh / h x 1200 pulses / kWh x 1h / 60 min = 1000 pulses /
min) gives a value of 1000 pulses / min that must be entered in the EQJW245. In
the EQJW245, a value of 1000 should be assigned to SP27 and a value of 700 to
SP28.
The EQJW245 switches automatically between the following two measuring
methods.
measurement of time interval (time interval measurement) between two •
pulses and calculation of the ‚pulses per minute‘ variable
measurement of the number of pulses per minute (pulse measurement) . •
SP25
SP26 – SP28