Lennox EMEA DUO CU Série Notice Technique D'installation page 33

 R450 Values
Designation
General safety LP switch
Compressor safety HP switch 1
Regulated LP switch 1
Compressor safety HP switch 2
Regulated LP switch 2
LP frame switch
HP frame switch

Adjust the thermal magnetic circuit breakers GV(x) according to the values shown in the wiring diagram on page 6
or 7

Disconnect all circuit-breakers in the electrical cabinet

Set the KT7 delay time to 30 minutes, ie the top slider for 6 to 60 minutes and the bottom slider on 5

Set the KT1 delay time to 6 minutes, ie the top slider for 1 to 10 minutes and the bottom slider 6

Set the KT2 delay time to 7mn, ie the top slider for 1 to 10 min and the bottom slider 7

Equip yourself with your electrical PPE

Close the main disconnect switch

Check the voltage before and after of the disconnect switch and before of all circuit-breakers

Using the phase controller check the order of these, the direction must be clockwise otherwise the compressors
will be irreversibly damaged.

Close the control circuit breaker Q77 (both condenser fans will run after 30 minutes if the low pressure (LP) is
higher than the BPE switch-on value. To avoid this, lower the LP pressure below the BPE and the HP pressure below
HPE)

Close transformer circuit breaker QF2

Adjust the fluid used in the P RACK controller by following the instructions below
DUO CU
GB
Pressure switch setting sheet
Abbreviation Temperature °C
BPG -26,0
HPS1 68
BPR1
HPS2 68
BPR2
BPE 2,0
HPE 50,0
-
33/72 -
Cut-off in bar
0,02
17,00
-8 0,47
17,00
-9 0,39
1,45
8,18
Interlocking in bar
0,72
13,00
1,17
13,00
1,09
2,1
12,2