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8.2.3 Resetting of dry-running warning

Manual resetting

If a dry-running warning has been activated, the 
pump can be restarted manually by pressing [Reset]. 
If the unit detects no pressure and no flow within 
40 seconds after restarting, the dry-running warning 
is re-activated. 

Auto-reset

When the auto-reset function is enabled, the pump 
will be restarted automatically after 24 hours in 
warning condition. If, after restarting, the pump has 
not been primed within 3 minutes of operation, the 
dry-running warning will reappear. The auto-reset 
function will attempt to restart the pump after 
24 hours. This will be repeated for five days, and if 
rainwater is still not available, there will be one week 
between the restarting attempts.

8.2.4 Power supply failure 

In case of a power supply failure, the pump restarts 
automatically when power returns and runs for at 
least 10 seconds.

9. Frost protection

If the unit is subjected to frost in periods of inactivity, 
the unit and the piping system should be drained 
before the unit is taken out of operation.

Note

The unit has no built-in draining 
options.

Summary of Contents for PM Rain

Page 1: ...GRUNDFOS INSTRUCTIONS PM Rain Installation and operating instructions...

Page 2: ...proximation of the laws of the EC member states Low Voltage Directive 2006 95 EC Standards used EN 60730 1 2000 and EN 60730 2 6 2008 EMC Directive 2004 108 EC Standards used EN 60730 1 2000 and EN 60...

Page 3: ...Functions 10 8 1 Anti cycling 10 8 2 Dry running protection 10 9 Frost protection 11 10 List of warnings 12 11 Technical data 12 12 Fault finding 13 13 Further product information 14 14 Disposal 14 W...

Page 4: ...hout solid particles or fibres that may attack the unit mechanically or chemically 3 2 Temperatures 3 2 1 Liquid temperature 0 to 60 C 3 2 2 Ambient temperature 0 to 55 C 3 3 Operating pressure Max 10...

Page 5: ...e unit so that the height between the unit and the highest tapping point does not exceed the values in the table below Default setting See section 5 1 DIP switches Note Use a suitable thread seal tape...

Page 6: ...rther adjustment is necessary repeat from point 2 When the pressure reducing valve has been adjusted correctly adjust the start pressure accordingly See section 5 1 DIP switches 10 Refit the PM Rain c...

Page 7: ...l installation make sure that the power supply cannot be accidentally switched on The unit must be connected to an external mains switch with a minimum contact gap of 3 mm in all poles As a precaution...

Page 8: ...witch 2 ON Start pressure 2 5 0 5 1 4 bar Start pressure 250 50 100 400 kPa See section 7 2 1 Starting and stopping conditions All set to OFF pstart 2 5 bar pstart 250 kPa 5 STOP START 1 BAR Start sto...

Page 9: ...at a pressure above 2 5 bar 250 kPa the mains water back up will remain inactive See fig 7 If rainwater is no longer available the PM Rain will stop the pump when dry running occurs When the system p...

Page 10: ...atically reset To enable the function set DIP switch 6 to ON See section 5 1 DIP switches 8 1 Anti cycling To detect inadvertent starts and stops of the pump in case of a failure in the installation t...

Page 11: ...not been primed within 3 minutes of operation the dry running warning will reappear The auto reset function will attempt to restart the pump after 24 hours This will be repeated for five days and if r...

Page 12: ...art stop sequences within a short period Each pump start is delayed a few seconds to protect the installation The start delay is active until normal operation has been re established Note The protecti...

Page 13: ...ump is blocked c The pump is defective Repair or replace the pump d The PM Rain is defective Repair or replace the PM Rain 3 The pump does not start when water is consumed Pump on is off a Too big dif...

Page 14: ...ction 8 1 Anti cycling b Cycling There is a minor leakage in the system Note For system without pressure tank Check the system for leaks See section 8 1 Anti cycling c Cycling The pressure tank has no...

Page 15: ...ndix 1 Fig 8 Wiring diagrams Fig 9 Dimensions TM04 9528 4510 TM04 1953 1508 IN M 3 L1 L3 N L1 L2 PE N U V 1x230 V 50 60 Hz PE 6 OUT 5 4 3 2 1 IN M 1 L1 L1 N PE N U V 1x230 V 50 60 Hz PE 6 OUT 5 4 3 2...

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Page 19: ...Peguam U1 25 Glenmarie Industrial Park 40150 Shah Alam Selangor Phone 60 3 5569 2922 Telefax 60 3 5569 2866 New Zealand GRUNDFOS Pumps NZ Ltd 17 Beatrice Tinsley Crescent North Harbour Industrial Est...

Page 20: ...ahead makes it possible Innovation is the essence The name Grundfos the Grundfos logo and the payoff Be Think Innovate are registrated trademarks owned by Grundfos Management A S or Grundfos A S Denma...

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