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7.6.4
Display address screens
Display Address
Display address setting
#
I/O Board addr ess
#
Terminal config
7.7
Setpoints
Cooling
Cooling set-point is an adjustable parameter for Return control (default) from 48.0°F
(8.9°C) ... 58.0°F (14.44°C) in one degree increments and for Supply control from
42.0°F (5.55°C) ... 58.0°F (14.44°C) . In cooling mode, user can enter a number
outside this range.
Heating
Heating set-point is an adjustable parameter from 95°F (35°C) ... 120.0°F (48.89°C) in
one degree increments, for both Return & Supply control. In heating mode, user cannot
enter a number outside of this range.
Compressor staging time
Compressor staging time is a PLC adjustable parameter from 10 s ... 110 s in 10-second
increments. You cannot enter a number outside of this range. Changing the setpoint
initiates a cooling cycle and takes a few seconds (staging time) for the next compressor
relay to close PLC .
Run mode - cooling
Compressor rotation is active during run mode. The compressor with the lowest running
hours is enabled first and compressor with the highest running hours is disabled first.
First stage is enabled and the compressor starts aer CW and SW flows are stable for
10 s (default).
First stage continues to run for 1 min before enabling the next stage. If the loop requires
demand, then the next stage is enabled.
Run mode – reverse cycle heating
Compressor rotation is active during run mode. The compressor with the lowest running
hours is enabled first and compressor with the highest running hours is disabled first.
Enable Reverse Cycle Heat only for the system.
First stage heating is enabled and the compressor starts aer CW and SW flows are
stable for 10 s.
First stage continues to run for 5 min before enabling the next heater stage. If the loop
requires demand, then the next stage is enabled.
Run mode – electric heating (optional heater barrel)
Heater rotation is active during run mode. The heater with the lowest running hours is
enabled first and the heater with the highest running hours is disabled first.
Enable Electric Heat only for the system.
First stage is enabled and the electric heater will start aer CW flow is stable for 10 s.
First stage continues to run for 5 min before enabling the next heater stage. If the PID
loop requires demand then the next stage is enabled.
10
Termi n al configuration
P: 02 Adr
Priv/Shared
Trm1
16/17/... Pr
Trm2
32
Sh
Trm3
8 Installation
The device can be installed as a stand-alone chiller or as part of a staged system. The
factory default setting is as a stand-alone chiller. Chillers supplied on a frame package are
configured and wired as part of the build process.
NOTE There is no need to set the differential/hysteresis settings if the unit is
part of a correctly configured multi-stage system.
When supplied as part of a modular system, the following tasks need to be completed:
1. Make chilled water and seawater connections between each stage.
2. Make network (physical and network addressing) connections between each stage.
3. Check that the firmware version is the same between each stage.
4. Configure the remote control panel.
8.1
Wiring the system
WARNING! Electrical shock hazard
Failure to obey the warning could result in death or serious injury.
Be careful when working around energized equipment.
The PLC comes with a 3 wire Modbus connection as part of the electrical box. This
connection is used for multistage configuration and networking to a boat management
system.
The details of how a system should be wired vary according to its components and
configuration. Keep the following considerations in mind when wiring the system:
• All wires are 18 gauge unless otherwise noted.
• Run all ground wires to the ground lug in the box.
• Size wires for the pump or pump relay panel (PRP).
• Pumps larger than 0.75 hp (0.56 kW) require a PRP, or PLC OTS with pump
contactors.
• Some chillers have only one low pressure switch (LP), some have two LPs in series.
The following diagram is an example of a basic wiring layout.
8.2
Verifying the firmware
For the system to function correctly, all stages must be running the same firmware
version. Do the following to view a stage's firmware version information:
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