EN - 53
Module 2: refrigerating circuit 3
Module 2 0-10V output
For speed control
The condensing pressure on the machine in module 1 is controlled exactly as described in the previous section. The condensing pressure on
the machine in module 2 is controlled exactly like a six-stage circuit with four V-frame modules:
On/Off control
with 4 V-frame condenser fan modules = 6 single-speed stages:
Speed control
with one stage of four speed-controlled fans and three stages of four on/off fans:
19.4 Control of air-cooled condenser for split-system unit and dry cooler
P02 = air-to-water; P08 = condenserless
The type of control selected will automatically be six-stage control (connected or not) for all split-system machines.
19.5 Total heat recovery
The total recovery function is enabled in cooling mode only (i.e. if P2=2).
The "heating/cooling selection" input (terminal 5-1 on J14) will be used by the customer to set the operating mode (standard or recovery).
Without recovery:
standard fan management (P179 = No and terminals 2-3 on J3 open).
With total recovery:
P179 = Yes and terminals 2-3 on J3 closed = On.
- The HP control setpoint then becomes equal to P181 + P193.
- The stage differentials (P185, P187 and P189) remain at 3.5 bar.
- The function that forces on all the fans is disabled when the outdoor temperature is higher than P182.
20. COMPRESSOR START-UP CYCLE
Compressor start-up
If short-cycle protection
If the power is accidentally cut or a short interruption occurs during start-up or operation, the unit will restart after a period of 5 minutes. The
exhaust valves are opened at 25% capacity during this 5-minute time delay.
The counter should decrement.
The operating states and any faults that occurred before the cut are saved in memory.
Message in fault memory: faults appear one after the other (another type of fault must always appear between two power cut faults)
If compressor start-up
10-second time delay during which the intake and exhaust valves are not actuated.
The exhaust valve is opened (50%) and the intake valve is opened (100%) during the 2 second on/off cycle.
A 90-second time delay starts.
P 1 7 9 . T O T A L R E C O V E R Y
Y E S / N O
P 1 9 3 . H P S T P S H I F T D U R I N G
T O T A L R E C O V E R Y x x . x b
A N T I - S H O R T - C Y C L E
C O M P X x x m n x x s
P O W E R C U T
Module 2: refrigerating circuit 3