Baltimore Aircoil Company TrilliumSeries TRF Manual

TrilliumSeries™
Adiabatic Cooler - TRF
OPERATION & MAINTENANCE MANUAL

TrilliumSeries™ Adiabatic Cooler - TRF Operation & Maintenance Manual –Table of Contents Page | 2
TrilliumSeries™ Adiabatic Cooler - TRF
OPERATION &MAINTENANCE MANUAL
Contents
1. Recommended Maintenance Intervals.......................................................................................................................................................... 6
2. Parts Map...................................................................................................................................................................................................... 7
Recommended Spare Parts ....................................................................................................................................................................... 8
3. Warnings and Cautions................................................................................................................................................................................. 9
Safety Precautions ..................................................................................................................................................................................... 9
Equipment Precautions............................................................................................................................................................................ 10
4. General Information .................................................................................................................................................................................... 11
Adiabatic Cooling ..................................................................................................................................................................................... 11
Methods of Operation............................................................................................................................................................................... 12
Adiabatic Operation ............................................................................................................................................................................. 12
Dry Operation ....................................................................................................................................................................................... 13
Adiabatic Switchpoint.......................................................................................................................................................................... 13
Operating Modes ...................................................................................................................................................................................... 13
Default ................................................................................................................................................................................................... 13
Energy Saver ........................................................................................................................................................................................ 13
Water Saver........................................................................................................................................................................................... 13
Load Limiting Modes................................................................................................................................................................................ 14
Night Quiet............................................................................................................................................................................................ 14
Night Dry ............................................................................................................................................................................................... 14
Schedule Dry ........................................................................................................................................................................................ 14
Maintenance Modes.................................................................................................................................................................................. 14
Coil Clean.............................................................................................................................................................................................. 14
Pad Clean.............................................................................................................................................................................................. 14
Complete Drain and Dry ...................................................................................................................................................................... 14
Warranty .................................................................................................................................................................................................... 14
5. Water Quality .............................................................................................................................................................................................. 15
Process Fluid Water Quality .................................................................................................................................................................... 15

TrilliumSeries™ Adiabatic Cooler - TRF Operation & Maintenance Manual –Table of Contents Page | 3
Adiabatic Pre-Cooler Water Quality ........................................................................................................................................................ 15
Biological Control..................................................................................................................................................................................... 16
6. Cold Weather Operation ............................................................................................................................................................................. 17
About Cold Weather Operation ............................................................................................................................................................... 17
Coil Freeze Protection.............................................................................................................................................................................. 17
Minimum Operation.............................................................................................................................................................................. 17
Emergency Coil Drain .......................................................................................................................................................................... 18
Pre-Cooler Freeze Protection .................................................................................................................................................................. 18
Protection of Electrical Components...................................................................................................................................................... 18
7. Component Information & Maintenance...................................................................................................................................................... 19
Make-Up Water.......................................................................................................................................................................................... 20
General.................................................................................................................................................................................................. 20
Make-up Water Connection ................................................................................................................................................................. 20
Pressure Reducing Valve .................................................................................................................................................................... 21
Solenoid Valve...................................................................................................................................................................................... 22
Constant Flow Valve ............................................................................................................................................................................ 22
Adiabatic Pre-Cooler Pads....................................................................................................................................................................... 22
General.................................................................................................................................................................................................. 22
Scaling and Fouling ............................................................................................................................................................................. 23
Adiabatic Pre-Cooler Pad Removal .................................................................................................................................................... 24
Water Distribution System....................................................................................................................................................................... 25
General.................................................................................................................................................................................................. 25
Upper Water Distribution Channel...................................................................................................................................................... 26
Lower Water Collection Channel ........................................................................................................................................................ 27
Sump Strainer....................................................................................................................................................................................... 27
Recirculation pump.............................................................................................................................................................................. 28
Sump Water Level Float Switches ...................................................................................................................................................... 28
Sump Drain Valve................................................................................................................................................................................. 29
Fan and Motor........................................................................................................................................................................................... 30
General.................................................................................................................................................................................................. 30
Fan and Motor Removal & Installation ............................................................................................................................................... 31
Finned Coil Heat Exchanger .................................................................................................................................................................... 36
Programmable Logic Controller (PLC) ................................................................................................................................................... 37
General.................................................................................................................................................................................................. 37
Replacing the PLC battery................................................................................................................................................................... 37

TrilliumSeries™ Adiabatic Cooler - TRF Operation & Maintenance Manual –Table of Contents Page | 4
8. Control Logic............................................................................................................................................................................................... 40
Sequence of Operation Diagram......................................................................................................................................................... 41
9. User Interface ............................................................................................................................................................................................. 42
Home Menu ............................................................................................................................................................................................... 42
Access Levels........................................................................................................................................................................................... 43
Overview Menu ......................................................................................................................................................................................... 44
Fan Menu................................................................................................................................................................................................... 46
All Fans Menu....................................................................................................................................................................................... 47
Fan X Menu ........................................................................................................................................................................................... 50
Setpoints ................................................................................................................................................................................................... 52
Leaving Fluid Control & Customer Input Control Menu ................................................................................................................... 52
Basin Water Quality Menu ................................................................................................................................................................... 54
Load Limiting Menu ............................................................................................................................................................................. 56
Maintenance Menu ............................................................................................................................................................................... 61
Technician Menu .................................................................................................................................................................................. 64
Input & Output........................................................................................................................................................................................... 65
Temperatures Menu ............................................................................................................................................................................. 65
Make Up Menu ...................................................................................................................................................................................... 67
Pumps Menu......................................................................................................................................................................................... 68
Basin Water Level Menu ...................................................................................................................................................................... 69
Starts and Hours Menu ........................................................................................................................................................................ 70
Manual Menu......................................................................................................................................................................................... 72
Alarms ....................................................................................................................................................................................................... 73
Alarm Details Page............................................................................................................................................................................... 74
Settings ..................................................................................................................................................................................................... 75
Setup Menu........................................................................................................................................................................................... 75
Modbus RTU Setup .............................................................................................................................................................................. 77
BACnet MSTP Setup ............................................................................................................................................................................ 78
Modbus TCP Setup .............................................................................................................................................................................. 80
BACnet IP Setup................................................................................................................................................................................... 81
Software Version Menu........................................................................................................................................................................ 83
Technician Menu .................................................................................................................................................................................. 85
Data Logging Retrieval............................................................................................................................................................................. 87
Readdress New Fan.................................................................................................................................................................................. 90
Headless HMI ............................................................................................................................................................................................ 91

TrilliumSeries™ Adiabatic Cooler - TRF Operation & Maintenance Manual –Table of Contents Page | 5
10. Unit Operation & Storage .......................................................................................................................................................................... 92
General ...................................................................................................................................................................................................... 92
Corrosion Protection................................................................................................................................................................................ 92
Inspection.................................................................................................................................................................................................. 94
Cleaning .................................................................................................................................................................................................... 94
Start-up...................................................................................................................................................................................................... 95
Control Panel........................................................................................................................................................................................ 95
Control Settings ................................................................................................................................................................................... 95
Component Operation ......................................................................................................................................................................... 95
Extended Shutdown ................................................................................................................................................................................. 97
11. Alarms & Troubleshooting......................................................................................................................................................................... 98
Unit Alarm Codes.................................................................................................................................................................................... 105
Fan Alarm Codes .................................................................................................................................................................................... 106
12. BMS Communication .............................................................................................................................................................................. 107
BACnet IP & Modbus TCP...................................................................................................................................................................... 107
Points List ............................................................................................................................................................................................... 107

TrilliumSeries™ Adiabatic Cooler - TRF Operation & Maintenance Manual –Recommended Maintenance Intervals
Page | 6
1. Recommended Maintenance Intervals
1
Recommended service intervals are the minimum for typical installations. Harsh environmental conditions may dictate more frequent servicing.
2
Do not attempt to remove the adiabatic pre-cooler pads wet to prevent excessive degradation.
Inspect and clean as necessary [1]:
Start-Up
Monthly
Quarterly
Semi
Annually
Annually
Inspect general condition of the unit and check unit for unusual noise or vibration
󰣐
󰣐
Inspect sump
󰣐
󰣐
Inspect water distribution system
󰣐
󰣐
Clean sump strainers & recirculation pumps
󰣐
󰣐
Inspect water level float switches
󰣐
󰣐
Inspect adiabatic pre-cooler pads [2]
󰣐
󰣐
Check operation of make-up valves and drain valve
󰣐
󰣐
Inspect the pressure reducing valve
󰣐
Check operation of pumps
󰣐
󰣐
Check operation of water level float switches
Inspect coil
󰣐
󰣐
Run coil clean maintenance mode
󰣐
Inspect unit finish
󰣐
Mechanical equipment system [1]:
Start-Up
Monthly
Quarterly
Semi
Annually
Annually
Check motor voltage and current
󰣐
󰣐
Check general condition of the fan(s)
󰣐
󰣐
Check fan cycling, smooth operation
󰣐
󰣐
󰣐
󰣐
󰣐

TrilliumSeries™ Adiabatic Cooler - TRF Operation & Maintenance Manual –Parts Map Page | 7
2. Parts Map
1
Coils
10
Integrated Control Panel
2
Fans with Integrated EC Motor Kit
11
Lower Water Collection Channel
3
Adiabatic Pre-Cooler Pads
12
Sump Access Door
4
Water Distribution Inspection Cover
13
Sump Strainer
5
Upper Water Distribution System
14
Drain Valve Access Cover
6
Plenum Access (on opposite face, not shown)
15
Recirculation Pump
7
Pressure Reducing Valve
16
Float Switch
8
Make Up Valve
17
Drain Valve
9
Constant Flow Valve
18
Overflow

TrilliumSeries™ Adiabatic Cooler - TRF Operation & Maintenance Manual –Parts Map Page | 8
Recommended Spare Parts
BAC Factory Authorized Parts are manufactured to meet rigorous specifications and are guaranteed to fit your unit and perform
as original equipment. BAC Factory Authorized Parts can be ordered through your local BAC Representative. Most BAC
Representatives maintain a local inventory of commonly used parts. For a free unit inspection and a specific parts list for your
serial number, contact your local BAC Representative today. Even with BAC’s fast delivery capability, it is still recommended
that certain essential and emergency repair part be maintained in your inventory to minimize any potential downtime.
Basic Recommended Spare Parts
Parts to Consider if Extended Downtime is a Concern
Recirculation Pump
Adiabatic Pre-Cooler Pad Kit
Float Switch
Fans with Integrated EC Motor Kit
Make-up Valve
Pressure Reducing Valve
Drain Valve
Strainer

TrilliumSeries™ Adiabatic Cooler - TRF Operation & Maintenance Manual –Warnings and Cautions Page | 9
3. Warnings and Cautions
Safety Precautions
•: Rotating equipment will cause severe personal injury or death to persons who come in contact.
Adequate safeguards (including the use of protective enclosures where necessary) should be taken with this equipment
both to safeguard the public from injury and to prevent damage to the equipment, its associated system, and the
premises.
•: Risk of electrocution which will cause severe personal injury or death. Use appropriate lockout
procedures. Do not perform any service on or near the unit without first ensuring the unit is de-energized.
•: Rotating equipment. Risk of serious injury or death. Never step on fan guard grill or subject the
guard grill to load. Do not place any objects on the fan guard grill.
•: The TrilliumSeries™ Adiabatic Cooler controls are set up to periodically flush and drain the water
system, thereby eliminating the need for water treatment. However, there may be unusual circumstances where chemicals
or biological contaminants could be introduced into the recirculating water system, that could be harmful if inhaled or
ingested. Wear appropriate respiratory protection, when exposed to the discharge air stream or to the mists produced by
cleaning activities associated with the recirculating water system or adiabatic pre-cooler pads.
•: Do not walk on the top horizontal surface of the unit. It is not intended to be used as a walking
surface or working platform. Risk of falling through the surface, resulting in physical injury or equipment damage.
•: Risk of electric shock. Live terminals and connections even with device switched off. Wait five
minutes after disconnecting the voltage at all poles before opening the fan and motor assembly.
•: Transporting the fan. Injuries from tipping or slipping. Wear safety shoes and cut-resistant safety
gloves. The fan is only to be transported in its original packaging. The fan is to be transported lying flat, i.e., the motor axis
must be vertical. Secure the fan(s) e.g., with a lashing strip to stop anything from slipping or tipping.
•: High temperature on fan motor electronics housing. Risk of burns. Ensure sufficient protection
against accidental contact.
•: Battery located in control panel PLC. Risk of explosion resulting in minor or moderate injury or
damage to property. Do not recharge or open the battery.

TrilliumSeries™ Adiabatic Cooler - TRF Operation & Maintenance Manual –Warnings and Cautions Page | 10
Equipment Precautions
NOTICE
•Drain all water piping feeding the adiabatic pre-cooler to avoid stagnant water conditions.
•Water hammer is a common reason for pressure-reducing valve failures. Protective devices should be installed to absorb
water hammer for systems with this risk.
•The adiabatic pre-cooler pads are made of flammable material and should be removed when performing hot work on or
near the unit. No actions that generate sparks should be performed on or near the unit.
•Do not run the unit wet with the adiabatic pre-cooler pads out and the fans on (thereby getting the coils wet). Wet/dry
cycling of the unit in this manner could shorten the coil life and void the warranty.
•To prevent excessive degradation, do not attempt to remove the adiabatic pre-cooler pads wet.
•Replace battery with R/C (BBCV2), Part. No. CR2032, rated 3V only. Use of another battery may present a risk of fire or
explosion. Only use the battery type specified in Table 6.
•Scratches on the control panel PLC motherboard may cause the motherboard to fail. Be careful with the battery
replacement lever and be sure to avoid scratching the motherboard.
•Changing the controller's parameters may result in an undesired operation of the unit, such as a hunting phenomenon,
premature activation of pre-cooling (and increased water consumption) or delayed pre-cooling activation (fluid outlet
temperatures exceeding the design temperature).
•Never use chloride or chlorine-based solvents such as bleach or muriatic (hydrochloric) acid to clean stainless steel. It is
important to rinse the surface with warm water and wipe with a dry cloth after cleaning.
•Do not use steam, high-pressure water, or high-pressure air to clean any component.

TrilliumSeries™ Adiabatic Cooler - TRF Operation & Maintenance Manual –General Information Page | 11
4. General Information
Adiabatic Cooling
Adiabatic cooling uses evaporation to cool air before it passes through a finned heat exchanger. During adiabatic cooling, a
wetted pad is used to cool the entering airstream. The pads are specially designed to retain water on the surface to ensure that
it does not carry over to the finned coil, minimizing the risk of coil damage. The finned heat exchanger stays dry, protecting
surfaces from scale and corrosion.
The use of a small amount of water to pre-cool the air entering the heat exchanger lowers the required airflow and fan power
compared to air-cooled units, while also lowering the fluid temperature back to the system. In the most efficient adiabatic
systems, the air is cooled close to the wet-bulb temperature. Such substantial depression of the air temperature results in a
significant increase in dry cooling capacity and energy efficiency compared to dry-only designs. Once the ambient temperature
begins to approach freezing, or during times of reduced load, the unit can be switched to operate in a dry-only mode, thus
decreasing water usage.
Adiabatic heat rejection system controls are designed to be flexible, intelligent, and customer friendly, taking full advantage of
the dual operating modes. At a customer-selected design point, such as a cooler ambient dry bulb and a lower heat load, the
unit can turn off the recirculating water and switch to operation in dry mode. Additionally, the low volume recirculating water
sump automatically drains when freezing temperatures are experienced, negating the need for sump heaters.
The recirculating design of an adiabatic heat rejection system consumes less water than an evaporative cooling tower and an
adiabatic cooler with a “once through” design that sends water directly to the drain.

TrilliumSeries™ Adiabatic Cooler - TRF Operation & Maintenance Manual –General Information Page | 12
Methods of Operation
Adiabatic Operation
As illustrated in Figure 1, when the unit operates in adiabatic mode, either the make-up water connection or the recirculation
pumps supply water over the adiabatic pre-cooler pads. Incoming air is humidified as it passes through the adiabatic pre-cooler
pads, cooling the air down close to the ambient wet bulb temperature. This cooled air passes over the coil and cools the
process fluid in the coil, which returns to the system. In the sump, pumps recirculate the water back over the pads. Part of the
recirculated water is evaporated while the excess water assists in rinsing the adiabatic pre-cooler pads. The unit controls
determine when the water is purged from the sump and new make-up water enters.
Figure 1. Adiabatic Operation

TrilliumSeries™ Adiabatic Cooler - TRF Operation & Maintenance Manual –General Information Page | 13
Dry Operation
As illustrated in Figure 2, when the unit operates in dry mode, ambient air cools the process fluid in the coils, which then
returns to the system. The unit operates in dry mode when the ambient dry bulb temperature is less than the adiabatic
switchpoint temperature.
Figure 2. Dry Operation
Adiabatic Switchpoint
The adiabatic switchpoint temperature, also referred to as dry swtichpoint temperature, is the ambient dry bulb temperature at
which the unit transitions from dry operation to adiabatic operation. Once the ambient temperature reaches the switchpoint, the
recirculating pumps turn on to pre-cool the intake air.
Operating Modes
Default
Utilizes factory set operating parameters that balance water and energy savings. Refer to Table 12 for more information.
Energy Saver
The unit is equipped with Energy Saver mode, which can be enabled at any time. This mode optimizes the operating
parameters to save energy. Energy Saver mode will enter adiabatic operation more quickly than Default or Water Saver
modes, resulting in lower fan power energy consumption. Refer to Table 12 for more information.
Water Saver
The unit is equipped with Water Saver mode, which can be enabled at any time. This mode optimizes the operating
parameters to save water. Water Saver mode will cause the unit to stay in dry operation longer than Default or Energy Saver
modes, resulting in lower water consumption. Refer to Table 12 for more information.

TrilliumSeries™ Adiabatic Cooler - TRF Operation & Maintenance Manual –General Information Page | 14
Load Limiting Modes
Night Quiet
Night Quiet load limiting mode will reduce sound levels of the unit overnight. When active, the Night Quiet feature limits the
maximum fan speed and uses a Night Quiet specific dry switchpoint. This will allow the cooler to run adiabatically at lower
outside air temperatures to maintain capacity. The Night Quiet feature can be activated on the touchscreen, through the BMS,
or by a schedule, so that the user can define a start time on one day and a stop time on the next day. All times are in a 24-hour
format.
Night Dry
Night Dry load limiting mode will prevent adiabatic operation of the unit overnight and can be activated by a schedule, so that
the user defines a start time on one day and a stop time on the next day. All times shall be in 24-hour format.
Schedule Dry
Schedule Dry load limiting mode prevents adiabatic operation during the day and can be activated by a schedule, so that the
user defines a start time on one day and a stop time on the same day. All times shall be in 24-hour format.
Maintenance Modes
Coil Clean
Coil Clean is a scheduled maintenance mode that will remove loose debris from the coil surface, ensuring maximum energy
efficiency. Coil clean reverses fan rotation and airflow while opening the make-up and drain valve if the outside air temperature
is greater than 40°F (4°C) to flush debris down the drain.
Pad Clean
Pad Clean is a scheduled maintenance mode that removes loose debris from the adiabatic pre-cooler pad surface, ensuring
maximum energy efficiency. Pad clean will open the make-up and drain valves to flush the pads with clean water.
Complete Drain and Dry
Complete Drain and Dry is a scheduled maintenance mode that fully drains the sump and dries out the adiabatic pre-cooler
pads.
Warranty
Please refer to the Terms and Conditions in the submittal package applicable to and in effect at the time of the sale/ purchase
of these products.

TrilliumSeries™ Adiabatic Cooler - TRF Operation & Maintenance Manual –Water Quality Page | 15
5. Water Quality
Process Fluid Water Quality
To prevent excessive fouling and internal coil corrosion, the recirculating water quality should remain within the limits indicated
in Table 1. A competent water treatment company should be consulted for the specific water treatment to be used that is
suitable for all materials of construction used in the entire system. For higher pH levels, it is recommended to add a specific
copper corrosion inhibitor such as TT or BZT with a target residual concentration of above 2 ppm (multiple dosages might be
required).
Variable
Copper
pH
6.5 -10.5
Hardness (as CaCO3)
0-500 mg/l
Alkalinity (as CaCO3)
0-500 mg/l
Conductivity
< 3300 μS/cm
Chlorides
< 250 mg/l
Total suspended solids
< 10 mg/l
COD (chemical oxygen demand)
< 50 ppm
Table 1. Heat Exchanger Circulated Water Quality
Adiabatic Pre-Cooler Water Quality
: The TrilliumSeries™ Adiabatic Cooler controls are set up to periodically flush
and drain the water system, thereby eliminating the need for water treatment. However, there may be
unusual circumstances where chemicals or biological contaminants could be introduced into the
recirculating water system, that could be harmful if inhaled or ingested. Wear appropriate respiratory
protection, when exposed to the discharge air stream or to the mists produced by cleaning activities
associated with the recirculating water system or adiabatic pre-cooler pads.
To control corrosion and scale, the water chemistry of the adiabatic pre-cooler water must be kept within BAC’s water quality
guidelines available at baltimoreaircoil.com. Material of construction for the TrilliumSeries™ Adiabatic Cooler – TRF is
thermosetting hybrid polymer.
The primary water treatment control method for the adiabatic pre-cooler is to provide sufficient water to the pre-cooler medium
to keep it flushed. If sufficient water is not provided to completely wet and flush the entire pre-cooler medium surface, deposits
of minerals will occur. Adiabatic pre-cooler water quality should be of potable supply. In the case of non-treated water, the
temperature should be kept below 68ºF (20ºC).
The sump will automatically drain when a maximum cycle of concentration is reached. The unit can also be set up to
periodically drain the sump and dry the adiabatic pre-cooler pads. These features reduce the risk of microbiological
contamination. Check your local codes and regulations for water treatment requirements.
The drained water may be suitable for non-potable use such as irrigation. Refer to local codes and regulations to determine
allowable uses.
In applications where hard water is supplied to the unit, a water softener may extend the life of the adiabatic pre-cooler pads.

TrilliumSeries™ Adiabatic Cooler - TRF Operation & Maintenance Manual –Water Quality Page | 16
The adiabatic pre-cooler pads have been treated with an algaecide to minimize the potential for algae growth. In cases where
excessive fouling is observed and is suspected to be interfering with the airflow, the adiabatic pre-cooler pads should be
cleaned and/or changed more frequently.
Biological Control
The TrilliumSeries™ Adiabatic Cooler has been designed to minimize the risk of uncontrolled growth of algae, slimes, and
other micro-organisms such as Legionella through:
1. Adjustable sump water retention time to mitigate standing water
2. Complete drying of the pre-cooling system after each adiabatic cycle
3. Complete draining of all water distribution piping installed on the unit after each adiabatic cycle
NOTICE: Drain all water piping feeding the adiabatic pre-cooler to avoid stagnant water
conditions.
4. Use of potable water supply at temperatures of 68ºF (20ºC) or less, where Legionella is dormant
5. Aerosol free operation
When basic housekeeping practices, and the guidelines for operation and maintenance of this bulletin are followed,
uncontrolled growth of micro-organisms will be avoided.

TrilliumSeries™ Adiabatic Cooler - TRF Operation & Maintenance Manual –Cold Weather Operation Page | 17
6. Cold Weather Operation
About Cold Weather Operation
The equipment can be operated in sub-freezing ambient conditions provided that the proper measures are taken. Listed below
are general guidelines that should be followed to minimize the possibility of freeze-up. Customers in climates that reach below
freezing temperatures should take necessary precautions to protect the water pipes from freezing. This may include installing a
valve to prevent standing water in the pipes (supplied by a third-party vendor). It may be necessary to heat trace all exposed
make-up water lines if the water cannot be shut off and external piping cannot be drained.
Coil Freeze Protection
For protection against coil freeze-up, recommended process fluid solutions are industrial grade inhibited ethylene glycol or
propylene glycol solution. When the use of glycol is not practical, the system must be designed to meet the minimum
temperature requirements.
Minimum Operation
When a glycol solution is not utilized, operate the system to maintain a minimum heat load on the process fluid so that the
temperature of the fluid leaving the coil is not less than 50°F (10°C). To maintain the leaving fluid temperature at 50°F (10°C)
when the process load is extremely light or off, apply an auxiliary heat load to the process fluid and adjust the flow to ensure
that fluid leaving the coil maintains the minimum required temperature. Table 2 lists the rate of heat loss per model number.
Model Number
# of
Fans
Heat Loss Data
(BTU/HR)3
TRF-1010N-C80XL17E
4
4,515,780
TRF-1010N-C80XS17E
4
4,437,940
TRF-1014N-C80XS26E
6
6,814,040
TRF-1014N-C80XM26E
6
6,739,300
TRF-1018N-C80XM34E
8
8,889,800
TRF-1018N-C80XD34E
8
8,740,240
TRF-1022N-C80XM43E
10
11,044,580
TRF-1022N-C80XD43E
10
10,888,320
TRF-1026N-C80XD51E
12
13,260,240
TRF-1026N-C80XQ51E
12
12,828,280
TRF-1030N-C80XD60E
14
15,634,340
TRF-1030N-C80XQ60E
14
15,187,740
TRF-1034N-C80XD68E
16
17,788,200
TRF-1034N-C80XQ68E
16
17,342,760
TRF-1038N-C80XD77E
18
19,935,680
TRF-1038N-C80XQ77E
18
19,488,920
Table 2. TRF Heat Loss Data
3
Heat loss data based on 102°F (39°C) entering coil water, nominal unit flowrate (with water) and -10°F (-23°C) ambient air temperature with a 45MPH
(72 km/hr) wind velocity. Fans and pump are off.

TrilliumSeries™ Adiabatic Cooler - TRF Operation & Maintenance Manual –Cold Weather Operation Page | 18
Emergency Coil Drain
Do not drain the coils as a regular method of freeze protection. Frequent draining promotes corrosion inside the coil tubes.
However, draining is acceptable as an emergency method of freeze protection if the coils are not protected by a glycol solution.
If the coils are not protected by a glycol solution, automatic drain valves and vacuum breakers are recommended to drain the
coils if flow stops or if the fluid temperature drops below 50°F (10°C) when the ambient temperature is below freezing. Further
protection against coil freeze-up is possible with the installation of an alarm to alert personnel when the temperature of the fluid
leaving the coils falls below 50°F (10°C). Contact your BAC Representative for guidelines on the installation of an emergency
coil drain system.
Pre-Cooler Freeze Protection
The integrated controls are set to a default cold weather threshold temperature of 38°F (3.4°C). When the outside air
temperature falls below the cold weather threshold temperature, the unit will automatically transition into dry mode of operation
and the sump drain valve will open. The control panel will automatically disable adiabatic operation when the outside air
temperature is below the cold weather threshold temperature.
Protection of Electrical Components
To protect the electrical components from cold weather, the electrical panel is equipped with a heater to prevent the
temperature inside the panel from dropping below 40°F (4.4°C).

TrilliumSeries™ Adiabatic Cooler - TRF Operation & Maintenance Manual –Component Information & Maintenance
Page | 19
7. Component Information & Maintenance
: Rotating equipment will cause severe personal injury or death to persons who
come in contact. Adequate safeguards (including the use of protective enclosures where necessary)
should be taken with this equipment both to safeguard the public from injury and to prevent damage to
the equipment, its associated system, and the premises.
: Risk of electrocution which will cause severe personal injury or death. Use
appropriate lockout procedures. Do not perform any service on or near the unit without first ensuring
the unit is de-energized.

TrilliumSeries™ Adiabatic Cooler - TRF Operation & Maintenance Manual –Component Information & Maintenance
Page | 20
Make-Up Water
General
A minimum water flow must be distributed over the adiabatic pre-cooler pads during adiabatic operation. Make-up flow rates
are listed in Table 3. Proper flow is preset using a pressure reducing valve and constant flow valve, as shown in Figure 3.
Model Number
# of Fans
Make-up
Water Flow
Rate
GPM
L/min
TRF-1010N-C80XX17E
4
5.3
20
TRF-1014N-C80XX26E
6
7.9
30
TRF-1018N-C80XX34E
8
10.6
40
TRF-1022N-C80XX43E
10
13.2
50
TRF-1026N-C80XX51E
12
15.9
60
TRF-1030N-C80XX60E
14
18.5
70
TRF-1034N-C80XX68E
16
21.2
80
TRF-1038N-C80XX77E
18
23.8
90
Table 3. Make-up Water Flow Rate per Model Number
Figure 3. Make-Up Water Connection Detail
Make-up Water Connection
Refer to the unit submittal package for specific water connection type, size, and location.
1
Make-up water connection (qty. 1)
2
Pressure reducing valve (qty. 1)
3
Solenoid valve (qty. 2)
4
Constant flow valve (qty. 2)