40
6.12.2 - Dual circuit – staged capacity loading
Loading sequence (%)
Unloading sequence (%)
Lead circuit
Lag circuit
Lead circuit
Lag circuit
0
0
100
100
50
0
100
95
55
0
100
90
60
0
100
85
65
0
100
80
70
0
100
75
75
0
100
70
80
0
100
65
85
0
100
60
90
0
100
55
95
0
100
50
100
0
95
50
100
50
90
50
100
55
85
50
100
60
80
50
100
65
75
50
100
70
70
50
100
75
70
0
100
80
65
0
100
85
60
0
100
90
55
0
100
95
50
0
100
100
0
0
6.12.3 - Dual circuit – smart capacity loading
Loading sequence (%)
Unloading sequence (%)
Lead circuit
Lag circuit
Lead circuit
Lag circuit
0
0
100
100
50
0
100
95
55
0
95
95
60
0
95
90
65
0
90
90
70
0
90
85
75
0
85
85
80
0
85
80
85
0
80
80
90
0
80
75
95
0
75
75
100
0
75
70
70
50
70
70
70
55
70
65
70
60
65
65
70
65
65
60
70
70
60
60
75
70
60
55
75
75
60
50
80
75
80
0
80
80
75
0
85
80
70
0
85
85
65
0
90
85
60
0
90
90
55
0
95
90
50
0
95
95
0
0
100
95
-
-
100
100
-
-
6.13 - High condensing temperature
61XWHZE units are high condensing units for which the maximum
condenser leaving water temperature can be set to 85°C (185°F).
6.14 - Head pressure control
For water-cooled 61XWHZE units, condensing pressure control
is assured if the three-way valve option is selected. The saturated
condensing temperature is controlled based on a user-configurable
fixed setpoint (SETPOINT menu). The three-way valve control
can be configured only by service technicians.
6.15 - Energy management module
The energy management module enables the system to control
the level of energy consumption, providing users with information
such as current unit status, compressors operating status, etc.
This option requires the installation of an additional SIOB/CIOB
board.
Energy management option – board connections
Description
Input/
Output Type
Remarks
Occupancy override
switch
DI-01
Digital
input
If the contact is closed in
Remote mode, the unit
goes into the occupied
mode
Capacity limit switch
input #2
DI-02
Digital
input
If the contact is closed, the
second capacity limit switch
is active
Customer interlock
DI-03
Digital
input
Permits immediate unit
shutdown
(Remote mode only)
Ice done contact
DI-04
Digital
input
If the contact is closed,
the unit enters the ice
storage mode
Space temperature for
reset control
AI-01
Analogue
input
Active setpoint reset via
space temperature control
Capacity limit control
AI-10
Analogue
input
Active setpoint reset via
unit capacity control
(4-20 mA)
Compressor is running
Output A
DO-01 Digital
output
Output active if
compressor A is operating
Compressor is running
Output B
DO-02 Digital
output
Output active if
compressor B is operating
Chiller Ready
DO-04 Digital
output
Output active when the
unit is ready to operate
Chiller in Alert
DO-05 Digital
output
Output active (relay output)
when the alert has been
tripped
Chiller totally shutdown DO-06 Digital
output
Output active (relay
output) when the unit has
completely stopped due to
an alarm
Chiller capacity running
output (0 to 10 Volts)
AO-01
Analogue
output
0 to 10 VDC output
6.16 - Master/Slave control
The control system allows for master/slave control of two units
linked by the network. The master unit can be controlled locally,
remotely or by network commands. Master/slave assembly must
be validated in order to start the master/slave chiller operation.
All control commands to the master/slave assembly (start/stop,
setpoint selection, heating control, load shedding, etc.) are handled
by the unit which is configured as the master. The commands are
transmitted automatically to the slave unit.
If the master chiller is turned off, while the master/slave function
is active, then the slave chiller will be stopped. Under certain
circumstances, the slave unit may be started first to ensure that
the run times of the two units are equalised.
In the event of a communication failure between the two units,
each unit will return to an autonomous operating mode until the
fault is cleared. If the master unit is stopped due to an alarm, the
slave unit is authorised to start.
IMPORTANT: Master/slave assembly can be configured only
by service technicians.
6 - STANDARD CONTROL OPERATIONS AND OPTIONS