BAC Nexus User manual

Nexus®Modular Hybrid Cooler
iPilot®Control System
Quick Start Guide

Nexus®Modular Hybrid Cooler iPilot®Control System Quick Start Guide - Forward
Page | 2
Be sure to have a copy of the submittal package
available for reference. If you do not have a copy of
the submittal package, or if you need additional
information about this unit, contact your local BAC
Representative whose name and telephone number
are on a label adhered to the control panel door. The
model number and serial number of the unit are also
located in this area.
Nexus®Modular Hybrid Cooler should be operated and
maintained according to the Operation & Maintenance
Manual,which should be thoroughly reviewed prior to operation of
the equipment.

Nexus®Modular Hybrid Cooler iPilot®Control System Quick Start Guide –Instructions Page | 3
Document Summary
This document is not a substitute for reviewing and following the Operation & Maintenance Manual. This Quick Start Guide is intended to
supplement the Operation & Maintenance Manual. The Operation & Maintenance Manual should be thoroughly reviewed prior to operation of
the equipment.
Safety
Pre-Startup
1. Verify the equipment is properly piped. Fluid needs to enter the top manifold (if included) and exit the bottom manifold (if included) as
shown below in Figure 1.
Figure 1. Fluid Inlet & Outlet Reference
DANGER: Contact with rotating equipment can cause severe personal injury or death. Do not
perform any service, maintenance, or inspection on or near the fan(s), motor(s), or inside the
unit without first ensuring that the fans and pump motors are disconnected from the power
source, locked out, and tagged out.
DANGER: Dangerous voltages are present in this equipment. To service the iPilot® control
system, disconnect the main electric power supply to the control panel and lock out and tag out
the circuit. To service all other components on the unit, lock out and tag out the iPilot® control
system. If ordered, the optional heater control panel should also be locked out and tagged out
during service or maintenance.
WARNING: Only qualified personnel should undertake the installation, operation, maintenance,
and repair of this equipment. Proper care, procedures, and tools must be used in handling,
lifting, installing, operating, maintaining, and repairing this equipment to prevent personal injury
and/or property damage.

Nexus®Modular Hybrid Cooler iPilot®Control System Quick Start Guide –Instructions Page | 4
2. Verify the equipment voltage noted on the equipment nameplate is equivalent to the site voltage. The equipment nameplate can be
found on the front control panel door and is shown below in Figure 2.
Figure 2. Equipment Nameplate

Nexus®Modular Hybrid Cooler iPilot®Control System Quick Start Guide –Instructions Page | 5
Optional Wiring Feature for Unit Communication
1. Verify that Building Management System (BMS) interface is correctly wired to the iPilot® control system per Figure 3 and the unit
submittal package.
a. Remote Start Signal, Terminals 21A, 23: Open = ON, Closed = OFF. Anytime equipment operation is required, Run Enable
must be turned ON either locally through the iPilot® control system interface or remotely with a signal by others.
b. Analog Control Signal, Terminals -V, 10V, mA: It is recommended to have the iPilot® control system automatically modulate
the fan speed for optimal energy and water savings. Using an analog control signal for fan control is only available in Energy
Saver Mode, and Water Saver Mode with Winter Guard enabled.
c. Alarm Dry Contact, Terminals AL1, AL2: Open = Alarm, Closed = Normal
d. BMS Communication via RS485, Terminals B1, B2: Modbus RTU, BACnet MS/TP.
e. BMS Communication via Ethernet, Terminal 13, 14 as shown on Figure 4: Modbus TCP/IP, BACnet/IP
Figure 3. Control Panel Field Wiring
Figure 4. PLC Ethernet Terminals

Nexus®Modular Hybrid Cooler iPilot®Control System Quick Start Guide –Instructions Page | 6
iPilot® Control System Quick Start with Recommended Settings
1. Verify that the supply power is connected to the iPilot® control system.
2. Turn on all circuit breakers inside the iPilot® control system.
3. Close the iPilot®control system panel and ensure that all the locks have been fully engaged and secured by rotating them 90° with a
flathead screwdriver or coin.
4. Turn on the main power supply to the unit and ensure that main disconnect switch on the iPilot® control system is turned ON.
5. On the iPilot®control system keypad press Prg. Press enter (←) 4 times to enter the default user password of “0000”.
6. From the Main Menu scroll up (↑) or down (↓) and highlight “D. Clock Menu”, then press enter (←). While in the Clock Menu, press
enter (←) to begin making changes. Use the up (↑)/down (↓)arrows to set the date, time, and time zone, then press enter (←) to
accept changes.

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7. Press Esc to return to the Main Menu. From the Main Menu, scroll up (↑) or down (↓) and select “A. User Menu”, then press enter
(←). Press down (↓) to go to “Oper Conditions E02”. Press enter (←) to begin making changes. Use the up (↑)/down (↓)arrows to
set the following values, then press enter (←) to accept changes.
-Set Operating Mode to Nexus
oIf customer analog control signal will be used, reference step 1.b of Optional Wiring Feature for Unit Communication
-Set Run Authorization to ON
-Set Leaving Process Fluid Setpoint at the value stated in the equipment Submittal
Set Water/Energy Saving between 1-7 (5 recommended)

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8. Press down (↓) to go to “Options E03”. Press enter (←) to begin making changes. Use the up (↑)/down (↓)arrows to set the
following values, then press enter (←) to accept changes.
-Set Customer Input to NO (recommended)
-Set Customer Input to YES (if customer analog control signal will be used, reference step 1.b of Optional Wiring Feature for Unit
Communication)
9. Press down (↓) twice to go to BMS Communication E05. Press enter (←) to begin making changes. Use the up (↑)/down (↓)arrows
to set the following values, then press enter (←) to accept changes.
-Choose Comm Type: None, BACnet/IP, BACnet/MSTP, Modbus IP, Modbus RTU
-Set Enable Unit Run Access via BMS to NO
-If applicable, configure the selected communication protocol in the proceeding screens
10. Press down (↓) twice to go to Emergency Mode E07. Press enter (←) to begin making changes. Use the up (↑)/down (↓)arrows to
set the following values, then press enter (←) to accept changes.
-Set Emergency mode to OFF. In the event of lost communication, the fan(s) will continue to operate at the last known fan speed.

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11. Press down (↓) to go to “Water Management E08 Periodic Bleed”. Press enter (←) to begin making changes. Use the up (↑)/down
(↓)arrows to set the following values, then press enter (←) to accept changes.
-Set Bleed Enable to ON or OFF.
oThis is an optional time-based bleed setting
-Set Time to Bleed
oThis is the frequency of the optional time-based bleed
-Set Bleed Time Lmt
oThis is the duration of the optional time-based bleed
12. Press down (↓) to go to “Water Management E09 Conductivity Bleed”. Press enter (←) to begin making changes. Use the up (↑)/down
(↓)arrows to set the following values, then press enter (←) to accept changes.
-Set Cond Bleed Enbl to ON
-Set Wtr Cond StPt to 3300 microohms/cm
-Set WtrCondPtDiff to 600.0 microohms/cm
13. Press down (↓) to go to “Water Management E10 Periodic Drain”. Press enter (←) to begin making changes. Use the up (↑)/down
(↓)arrows to set the following values, then press enter (←) to accept changes
-Set Drain Enable to either ON or OFF (ON is recommended)
oThis is an optional time-based drain setting
-Set Time to Drain (2 hrs. is recommended)
oIf the equipment spray pump is not active for this amount of time, the basin will automatically drain.
14. Press Esc to return to the Main Menu. From the Main Menu scroll up (↑) or down (↓) and select Logout, then press enter (←). Press
enter (←) again to log out.

Nexus®Modular Hybrid Cooler
iPilot®Control System
Quick Start Guide
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