Insufficient Flow Rate Provided By The Pump - Lennox CLIMATIC 50 User Manual

INSUFFICIENT FLOW RATE PROVIDED BY THE PUMP

Description
Pump k supplying flow rate to the evaporator has been ordered to start for 20 seconds.
The flow switch FSE is detecting insufficient flow rate in the heat exchanger for more than 25 seconds.
Action
Case 1 :
The unit only handles ONE pump
Immediate shut down of compressors and pump k.
Fault signal 001 is shown on the display.
The remote fault signal is delayed by 6 minutes
Case 2 :
The unit handles TWO pumps and the "Normal/ Safety" mode or "Clock" has been activated.
Immediate shut down of pump k.
nd
Start up of the 2
If the FSE is detecting a flow rate, then the fault 040 is shown on the display, the unit is then running
normally
If the FSE does not detect any flow rate the fault 040 is shown on the display, the unit is then shut down
The remote fault signal is delayed by 6 minutes
Reset
In all cases implying a shut down of the unit, 3 start up attempts are made then after these three faults per
day the unit can only be restarted by a manual reset
Notes:
Fault counter is cleared and reset every day at 10 am, as long as the maximum number of faults has not
been reached.
Possible causes
Problem in the pump control wiring.
Problem with flow switch wiring.
Dirty water filter
Wrong setting of the flow switch
CLIMATIC 50 user manual – Chillers ranges
Fault Code:
pump (refer to "EVAPORATOR PUMP(S) CONTROL" section for more details)
001 040
Solving the problem
Check the pump connections
Check the flow switch connection
Clean the water filter
Adjust the setting of the flow switch
CL50-CHILLERS/IOM/1105-E
FAULT CODES
36
36