Lennox CLIMATIC II User Manual

V2.2
-00
9
CONTROL OF COMPRESSORS
Function
The compressors are started up and stopped in the order which avoids the anti-short cycle, as far as possible,
and evens out their operating times..
Description
F Start-up and stopping order for compressors
This order is determined by a “FIFO” (first in, first out) rule. This function incorporates the automatic,
instantaneous recording of a priority compressor which has become unavailable
F Compressor start-up and stopping
The compressor COMPmn starts up if all the following conditions are satisfied :
ð The water circulation pump received the order to operate at least 1 minute earlier.
ð The on / off switch for circuit n is ON (MAARn = 1).
ð The machine is available (DISPOM = 1).
ð Circuit n is available (DISPOCn = 1).
ð Compressor mn is available (DISPOmn = 1).
ð The regulation thermostat THER is greater than the number of compressors in service.
ð COMPmn is the compressor defined by the FIFO rule as the next one to start up.
ð COMPmn is not in anti-short cycle (ACCmn = 1).
The compressor COMPmn stops if at least one of the following conditions is satisfied :
ð The remote on / off switch for the machine is OFF (MAARD = 0).
ð The on / off switch for circuit n is OFF (MAARn = 0).
ð The machine is unavailable (DISPOM = 0).
ð Circuit n is unavailable (DISPOCn = 0).
ð Compressor mn is unavailable (DISPOmn = 0).
ð The regulation thermostat THER is less than the number of compressors in service and COMPmn is the
compressor defined by the FIFO rule as the next one to be stopped.
F Example of regulation with 4 compressors :
THER
0 1 2 3 4 3 4 3 2 1 2 3 2 3 4 3 2 1 0
Last one started up
- 1 2 3 4 - 1 - - - 2 3 - 4 1 - - - -
Last one stopped
- - - - - 1 - 2 3 4 - - 1 - - 2 3 4 1
Compressor
number
In operation
- 1 1 2
1 2
3
1 2
3 4
2
3
4
2 3
4 1
3 4
1
4 1 1 1 2
1 2
3
2 3
2 3
4
2 3
4 1
3 4
1
4 1 1 -

Lennox CLIMATIC II Specifications

General

Brand	Lennox
Model	CLIMATIC II
Category	Control Unit
Language	English