Carel MuChiller UCHBD00001130, Руководство пользователя, Страница: 76 / 108

ENG
5.18
4-way valve
management
A special function has been included to ensure correct control of the 4- way valve that reverses the
refrigerating cycle. When there is a request to reverse the valve, the controller checks whether the
pressure difference is higher than a threshold before activating the valve: if the difference is lower, the
application waits until the compressor starts and then activates the valve when the pressure difference is
reached.
User Code Description Def Min Max UOM
M S054 4-way valve: pressure differential for reversing 3.0 0.0 999.9 bar
In the event of a power failure, the controller realigns the 4-way valve with the physical position of the
valve at next start-up, considering the status of the circuit at the time of the power failure.
5.19
Manual device
management
In the menu relating to the individual devices, operation of the individual actuators fitted on the unit can
be switched from automatic to manual. For digital outputs, the options are ON or OFF, while analogue
outputs can be set from 0 to 100%; the default values are all Auto.
User Code Description Def Min Max UOM
S E000
ExV circuit 1: manual mode
0/1=No/Yes
0 0 1 -
S E001 ExV circuit 1: steps in manual mode 0 0 65535 steps
S E002
ExV circuit 2: manual mode
0/1=No/Yes
0 0 1 -
S E003 ExV circuit 2: steps in manual mode 0 0 65535 steps
S U002
User pump 1: operating mode
0=AUTO; 1=OFF; 2=ON
0 0 2 -
S U005
User pump 2: operating mode
0=AUTO; 1=OFF; 2=ON
0 0 2 -
S C002
Comp. 1 circuit 1: operating mode
0=AUTO; 1=OFF; 2=ON
0 0 2 -
S C005
Comp. 2 circuit 1: operating mode
0=AUTO; 1=OFF; 2=ON
0 0 2 -
S C008
Comp. 2 circuit 1: operating mode
0=AUTO; 1=OFF; 2=ON
0 0 2 -
S C011
Comp. 2 circuit 2: operating mode
0=AUTO; 1=OFF; 2=ON
0 0 2 -
S S002
Source pump 1: operating mode
0=AUTO; 1=OFF; 2=ON
0 0 2 -
S S011
Source modulating fan circuit 1: operating mode
0=AUTO; 1=0%; 2=1%, .. ; 101=100%
0 0 101 -
S S014
Source ON/OFF fan 1 circuit 2: operating mode
0=AUTO; 1=OFF; 2=ON
0 0 2 -
S S015
Source modulating fan circuit 2: operating mode
0=AUTO; 1=0%; 2=1%, .. ; 101=100%
0 0 101 -
These operations bypass temperature control, but not the alarm thresholds set to protect unit safety; in
general, these operations are used to test the individual actuators during installation. Manual operation of
the devices is described below:
Device Notes
Compressors
Safety times taken into account
All compressor alarms are enabled
User pumps Pump overload and flow alarm active
Source pump -
Defrost -
Source fans Speed-up disabled
ExV All alarms disabled
76 | 5. Functions
µC0300053EN rel. 1.0 – 23.07.2018