Evaporator Pumps Control - Lennox CLIMATIC 50 User Manual

EVAPORATOR PUMP(S) CONTROL
Function
Ensure the presence of a flow rate of heat transfer fluid in the evaporator heat exchanger.
Description
Seven types of control rules can be set. They are defined using the menu 3112 on the DS50 Service
Display.
• If 3112 = Started .........................CLIMATIC
• If 3112 = Stopped, ......................Pumps are stopped.
• If 3112 = P1 Only .........................CLIMATIC
• If 3112 = P2 Only ........................CLIMATIC
• If 3112 P1N P2R ..........................CLIMATIC
• If 3112 = P2N P1R ......................CLIMATIC
• If 3112 – Clock .............................CLIMATIC™ 50 control handles both pumps equalizing running
This
Pump N°1 is running if all of the following conditions are met:
At least one ON/OFF of circuit "n" is ON
Unit remote ON/OFF is ON *
NOT in the unoccupied zone*
Set point 3112 is not set to "Stopped"
Configuration 3841 is not set to "No"
Pump has been stopped for 1 minute or is already running.
There is no electrical fault on the pump
There is to « flow rate » fault
* These conditions are ignored if the outdoor temperature is below set point 3341 + 1°C and if the outlet
water temperature is below set point +1°C, in order to prevent the water from freezing.
A pump can be controlled by the CLIMATIC
refrigeration unit.
In the case where the customer is handling the control of his own pump, the following procedure must be
followed:
Start the pump at least 1 minute before validating the remote ON/OFF switch operation.
Switch off the pump 2 minutes at least after the remote ON/OFF switch has gone to 0.
CLIMATIC 50 user manual – Chillers ranges
TM
50 does not control the pumps
TM
50 Control only runs pump n°1.
TM
50 Control only runs pump n°2.
TM
50 Control handles both pumps with
N°1 as standard and N° 2 as backup.
TM
50 Control handles both pumps with
N°2 as standard and N° 1 as backup.
times and switching from one pump to the other every Tuesday at
18h00.
50 even if electrically the network pump is not handled by the
TM
CL50-CHILLERS/IOM/1105-E
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