38
Diaphragm tank size
Precharge pressure
Hydro MPC-E and -F: 0.7 x setpoint.
Hydro MPC-S: 0.9 x setpoint.
During each flow estimation (every 2 minutes), the estimating
function will disturb the discharge pressure by ±10 % of the
setpoint. If this disturbance is not acceptable, the stop function
must be based on direct flow measurement with a flowmeter or
flow switch.
The minimum flow rate can be set, i.e. the flow rate at which the
booster system changes to on/off control of the last pump in
operation.
If both a flowmeter and a flow switch are connected, the
changeover to on/off control is determined by the unit first
indicating low flow rate.
Setting range
Setting via control panel
System without flow switch or flowmeter
1. Mark the Settings menu with .
2. Mark Secondary functions with or , and press .
3. Mark Stop function with or , and press .
4. Mark Activated with or , and press .
The activation is indicated by a check mark in the box.
5. Mark On/off band with or .
6. Set the on/off band with or , and save with .
7. Mark Go to setting of flow stop parameters with or
, and press .
Now the display below is shown.
Fig. 62 Stop parameters
8. Select one of the stop parameters with or , and save
with . If Customised settings are selected, the
parameters shown in fig. 63 must be set. See examples
below.
Fig. 63 Customised settings
Example 1: Increasing the stop limit, Q
min
(high flow limit)
• Increase the delta pressure for gradient.
• Reduce the delta time for gradient (pump stopped).
• Reduce the delta time for gradient (pump running).
• Increase speed reduction.
Example 2: Reducing the stop limit, Q
min
(low flow limit)
• Reduce the delta pressure for gradient.
• Increase the delta time for gradient (pump stopped).
• Increase the delta time for gradient (pump running).
• Reduce speed reduction.
Pump type
Recommended diaphragm tank size [litres]
-E -F -S
CRI(E) 3 8 8 80
CRI(E) 5 12 12 120
CRI(E) 10 18 18 180
CRI(E) 15 80 80 300
CRI(E) 20 80 80 400
CR(E) 32 80 80 600
CR(E) 45 120 120 800
CR(E) 64 120 120 1000
CR(E) 90 180 180 1500
CR(E) 120 180 180 1500
CR(E) 150 180 180 1500
On/off band: 5 to 30 %
Min. flow rate: 2 to 50 % of the nominal flow rate (Q
nom
) of one
of the pumps. (Can only be set if direct flow
measurement by means of flowmeter has been
selected.)
TM03 9966 4807
TM03 8957 4807
Rule of thumb: Speed reduction = 2 x delta
pressure for gradient.
Example of increased stop limit
Parameter Value
Delta pressure for gradient 6 %
Delta time for gradient (pump stopped) 1.5 sec
Delta time for gradient (pump running) 2.0 sec
Speed reduction 10 %
Example of reduced flow limit
Parameter Value
Delta pressure for gradient 3 %
Delta time for gradient (pump stopped) 15.0 sec
Delta time for gradient (pump running) 25.0 sec
Speed reduction 6 %
The stop limit depends on the tank size.
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