BAC Vertex VRC A-1012N Series Manual

Vertex™
Evaporative Condenser
OPERATION & MAINTENANCE MANUAL

Vertex™ Evaporative Condenser Operation & Maintenance Manual –Table of Contents Page | 2
Vertex™ Evaporative Condenser
OPERATION & MAINTENANCE MANUAL
Contents
1. Recommended Maintenance Intervals.......................................................................................................................................................... 5
2. Warnings and Cautions................................................................................................................................................................................. 6
Safety Precautions........................................................................................................................................................................................ 6
Equipment Precautions................................................................................................................................................................................. 7
General Maintenance Information ................................................................................................................................................................ 8
3. Unit Operation and Storage .......................................................................................................................................................................... 9
Recommended Spare Parts ....................................................................................................................................................................... 11
Start-Up Procedure..................................................................................................................................................................................... 12
Considerations for Initial Start-Up........................................................................................................................................................... 12
General................................................................................................................................................................................................... 12
Cleaning ................................................................................................................................................................................................. 12
Inspection............................................................................................................................................................................................... 12
Start-Up.................................................................................................................................................................................................. 13
Extended Shutdown.................................................................................................................................................................................... 15
Prolonged Outdoor Storage........................................................................................................................................................................ 16
Storage Preparation ............................................................................................................................................................................... 16
Maintenance Requirements During Storage .......................................................................................................................................... 18
Start-Up Preparation After Prolonged Storage....................................................................................................................................... 18
4. Component Maintenance Procedures......................................................................................................................................................... 19
Basin........................................................................................................................................................................................................... 19
Water Levels .......................................................................................................................................................................................... 19
Inspection & Maintenance...................................................................................................................................................................... 20
EC Fan System........................................................................................................................................................................................... 20
Electronically Commutated (EC) Fan Motors ......................................................................................................................................... 20
Unit Mounted Electrical Panel ................................................................................................................................................................ 20
Alarm Signal........................................................................................................................................................................................... 20
Override Switch...................................................................................................................................................................................... 21
BALTIDRIVE®Power Train......................................................................................................................................................................... 21
Adjustable Motor Base ........................................................................................................................................................................... 24
Fan Motor Inspection & Maintenance..................................................................................................................................................... 24

Vertex™ Evaporative Condenser Operation & Maintenance Manual –Table of Contents Page | 3
Fan Shaft Bearing Inspection & Maintenance ........................................................................................................................................ 24
Locking Collars....................................................................................................................................................................................... 25
Water Distribution System and Heat Transfer Section ............................................................................................................................... 26
Water Level Control.................................................................................................................................................................................... 27
Mechanical Make-up Valve Assembly.................................................................................................................................................... 27
Optional Electric Water Level Control Package...................................................................................................................................... 28
5. Corrosion Protection .................................................................................................................................................................................. 29
Water Treatment......................................................................................................................................................................................... 30
Corrosion and Scale Control....................................................................................................................................................................... 31
Gray Water and Reclaimed Water.............................................................................................................................................................. 32
Chemical Treatment Requirements............................................................................................................................................................ 32
Passivation ................................................................................................................................................................................................. 32
Biological Control........................................................................................................................................................................................ 33
Long Term Care of Stainless Steel............................................................................................................................................................. 33
BAC’s Manufacturing Process................................................................................................................................................................ 33
Jobsite Considerations ........................................................................................................................................................................... 33
Recommended Cleaning Procedure ...................................................................................................................................................... 33
System Cleaning......................................................................................................................................................................................... 34
Coil Cleaning.......................................................................................................................................................................................... 34
Weld Byproduct Cleaning....................................................................................................................................................................... 34
6. Bleed Rate .................................................................................................................................................................................................. 35
7. Cold Weather Operation ............................................................................................................................................................................. 36
Inspection & Maintenance .......................................................................................................................................................................... 36
Fan Section Icing Protection....................................................................................................................................................................... 36
Fan Control............................................................................................................................................................................................. 37
Dry Operation......................................................................................................................................................................................... 37
Basin Water and Internal Piping Freeze Protection.................................................................................................................................... 37
Basin Protection ..................................................................................................................................................................................... 37
Coil Freeze Protection ................................................................................................................................................................................ 38
Minimum Operation................................................................................................................................................................................ 38
8. Operation Considerations for ...................................................................................................................................................................... 39
Accessories..................................................................................................................................................................................................... 39
Basin Heater (Optional) .............................................................................................................................................................................. 39
Operation................................................................................................................................................................................................ 39
Stand Alone BAC Heater Control Panel (Optional)..................................................................................................................................... 40
Operation................................................................................................................................................................................................ 40
Vibration Cutout Switch (VCOS)................................................................................................................................................................. 42
Mechanical Vibration Cutout Switch (Optional) ...................................................................................................................................... 42

Vertex™ Evaporative Condenser Operation & Maintenance Manual –Table of Contents Page | 4
Electronic Vibration Cutout Switch (Optional)......................................................................................................................................... 43
Redundant Pump System (Optional).......................................................................................................................................................... 44
Pump Switch Over:................................................................................................................................................................................. 45
Pump Removal:...................................................................................................................................................................................... 45
Pump Installation:................................................................................................................................................................................... 47
9. Fan Control ................................................................................................................................................................................................ 48
EC Fan System Fan Control....................................................................................................................................................................... 48
Sequence of Operation .......................................................................................................................................................................... 48
Fan Ramp Sequence ............................................................................................................................................................................. 48
VERTEX™ Fan Ramp-down.................................................................................................................................................................. 49
EC Fan System Troubleshooting................................................................................................................................................................ 49
Loss of Control Signal ............................................................................................................................................................................ 49
Refrigeration System Controller Power Outages.................................................................................................................................... 49
Single Fan Communication Loss............................................................................................................................................................ 49
All Fan Communication Loss.................................................................................................................................................................. 50
Power Outage ........................................................................................................................................................................................ 50
Single Fan Power Outage ...................................................................................................................................................................... 50
Unit Power Outage................................................................................................................................................................................. 51
Fan Alarm Codes ................................................................................................................................................................................... 51
BALTIDRIVE®Power Train......................................................................................................................................................................... 53
Independent Fan Control (Optional) ........................................................................................................................................................... 53
Variable Frequency Drive Operation .......................................................................................................................................................... 54
Resonant Speed Identification Procedure .................................................................................................................................................. 55
10. Installation Instructions for Field Connections.......................................................................................................................................... 57

Vertex™ Evaporative Condenser Operation & Maintenance Manual –Recommended Maintenance Intervals Page | 5
1. Recommended Maintenance Intervals
1
Recommended service intervals are the minimum for typical installations. Harsh environmental conditions may dictate more frequent servicing
2
When operating in ambient temperatures below freezing, the unit should be inspected more frequently. Refer to section 7. Cold Weather Operation on
Page 30 for more details.
3
On units equipped with BALTIDRIVE®Power Train only.
4
Tension on new belts must be readjusted after the first 24 hours of operation and quarterly, thereafter.
Inspect and clean as necessary
[1]
:
Start-Up
Monthly
Quarterly
Annually
Shutdown
Inspect general condition of the unit [2] and check unit for unusual noise or vibration
󰣐
󰣐
Inspect basin
󰣐
󰣐
Flush water distribution system/Inspect spray nozzles
󰣐
󰣐
Clean basin strainer
󰣐
󰣐
󰣐
Clean water guards
󰣐
󰣐
Drain basin and piping
󰣐
󰣐
Check and adjust water level in basin
󰣐
󰣐
Check operation of make-up valve
󰣐
󰣐
Inspect coil
󰣐
Check and adjust bleed rate
󰣐
󰣐
Inspect unit finish
󰣐
Mechanical equipment system [1]:
Start-Up
Monthly
Quarterly
Annually
Shutdown
Check belt condition [3]
󰣐
󰣐
Adjust belt tension [3],[4]
󰣐
󰣐
Lubricate fan shaft bearings [3]
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󰣐
󰣐
Lubricate motor base adjusting screw [3]
󰣐
󰣐
󰣐
Check drive alignment [3]
󰣐
Check motor voltage and current
󰣐
󰣐
Clean fan motor exterior
󰣐
󰣐
Check fan motor for proper rotation
󰣐
Check general condition of the fan
󰣐
󰣐
Check fan for uniform pitch [3]
󰣐
Check fan for rotation without obstruction
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󰣐
Check and recoat steel shafts with RUST VETO® [3]
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󰣐
Check optional basin heater and stand alone BAC heater control panel
󰣐
Test optional vibration cutout switch [3]
󰣐
󰣐

Vertex™ Evaporative Condenser Operation & Maintenance Manual –Warnings and Cautions Page | 6
2. 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.
•: The top horizontal surface of the unit is not intended to be used as a walking surface or working
platform. If access to the top of the unit is desired, the purchaser/end-user is cautioned to use appropriate means
complying with OSHA or other applicable safety standards of governmental authorities.
•: The recirculating water system may contain chemicals or biological contaminants, including
Legionella, which could be harmful if inhaled or ingested. Personnel exposed directly to the discharge airstream and the
associated drift mists, generated during operation of the water distribution system and/or fans, or mists produced by high
pressure water jets or compressed air (if used to clean components of the recirculating water system), must wear
respiratory protection equipment approved for such use by governmental occupational safety and health authorities.
•: Before performing an adjustment or inspection of the VCOS, make certain that all power has
been disconnected and locked in the off position. Moisture inside the switch can lead to switch failure. Care must be taken
when replacing the cover on the vibration switch to ensure that the proper watertight seal is obtained.
•: When the fan speed of the unit is to be changed from the factory set speed, including changes
achieved by the use of a variable fan speed device, steps must be taken to avoid operation at or near the fan’s “critical
speed” which could result in fan failure and possible personal injury or damage. Contact your local BAC Representative
regarding any such applications.
•: A lockable disconnect switch should be located within sight of the unit for each fan motor
associated with this equipment. Before performing any type of service of inspection, make certain that all power has been
disconnected, and the switch is locked out in the “OFF” position.
•: The operation, maintenance, and repair of this equipment shall be undertaken only by personnel
authorized and qualified to do so. All such personnel shall be thoroughly familiar with the equipment, the associated
system and controls, and the procedures set forth in this manual. Proper care, personal protective equipment, procedures,
and tools must be used in handling, lifting, installing, operating, maintaining, and repairing this equipment to prevent
personal injury and/or property damage.
•: This equipment should never be operated without all fan screens, access panels, and access
doors in place.
•: Openings and/or submerged obstructions may exist in the bottom of the basin. Use caution when
walking inside this equipment.

Vertex™ Evaporative Condenser Operation & Maintenance Manual –Warnings and Cautions Page | 7
•: Do not use the plastic drift eliminators as a walking, working, or storage surface. Stepping on or
placing weight on an eliminator can result in physical injury and/or equipment damage. After ensuring that the fan and
pump motors are locked and tagged out, lift and remove eliminators as necessary to perform recommended maintenance
and inspections. If access to the top of the coil is required, place a piece of plywood at least 1/2 inch thick on top of the
coil to protect the surface while performing the recommended maintenance. When finished, carefully remove the plywood
and re-install any eliminators which were removed.
•: Drift eliminators can separate from the product during high winds. Fasten drift eliminators in place
using the retaining system.
Equipment Precautions
NOTICE
•BAC units are typically installed immediately after shipment, and many operate year-round. However, if the unit is to be
stored for a prolonged period either before or after installation, certain precautions should be observed, as outlined in
section Prolonged Outdoor Storage on Page 16.
•Spray system pressure greater than 10.0 psig may cause damage to the distribution system.
•Check to ensure the controls for the fan motor are set to allow a maximum of six on-off cycles per hour to prevent motor
overload.
•Covering the unit with a clear plastic tarpaulin during storage can trap heat inside the unit and cause damage to the PVC
components. If units must be covered during storage, an opaque, reflective tarp with vents should be used.
•Do not use steam or high-pressure water to clean PVC eliminators or materials other than steel.
•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.
•Mechanical and operational methods must be employed to protect these products against damage and/or reduced
effectiveness due to possible freeze-up. Please refer to BaltimoreAircoil.com or contact your local BAC Representative for
recommended protection alternatives.
•The basin heater is not designed to prevent icing during unit operation.
•The stand alone BAC heater control panel temperature/low level control can only be used with the supplied combination
temperature/liquid level sensor probe.
•For the stand alone BAC heater control panel, Do not operate the system unattended or for extended periods of time
during test mode (resistor across terminals T1 and T2). Operation in water temperatures above 45°F (7.2°C) could
damage the unit.
•For the stand alone BAC heater control panel, do not operate the system unattended or for extended periods of time with
terminals G1-G2 jumpered. A low liquid level condition could occur, and the system will not shut off which could result in
damage to the heater and unit.
•For a unit with a VFD, with a switching frequency of 2.5 kHz, the line lead length cannot exceed 100 feet. If the switching
frequency is higher than 2.5 kHz and/or the line lead length exceeds 100 feet, a dV/dT output filter is recommended to
protect the motor. Since the switching frequency and maximum line length requirements vary between VFD and motor
suppliers, contact your local BAC Representative to determine if a dV/dT filter is required. For fan motors controlled with
VFDs, when reversing the direction of fan rotation, allow the fan to come to a complete stop before restarting the motor.
•For fan motors controlled with VFDs, when reversing the direction of fan rotation, allow the fan to come to a complete stop
before restarting the motor.

Vertex™ Evaporative Condenser Operation & Maintenance Manual –Warnings and Cautions Page | 8
General Maintenance Information
The services required to maintain a piece of evaporative cooling equipment are primarily a function of the quality of the air and
water in the locality of the installation:
•AIR: The unit should be located such that unusual quantities of industrial smoke, chemical fumes, salt, or heavy dust do
not enter the equipment. Such airborne impurities entering into the equipment and absorbed by the recirculating water,
which can form a corrosive solution.
•WATER: As water evaporates from the equipment, dissolved solids from the make-up water are left behind. These
dissolved solids may be either alkaline or acidic, and as they are concentrated in the circulating water, they can cause
scaling or accelerated corrosion.
The extent of impurities in the air and water determines the frequency of most maintenance services and governs the extent of
water treatment which can vary from a simple continuous bleed and biological control to a sophisticated treatment system.
Refer to section Water Treatment on Page 30 and section Biological Control on Page 33 for more details.
Please refer to the Limitation of Warranties in the submittal packet applicable to and in effect at the time of the sale/purchase of
these products. Described in this manual are the recommended services for start-up, operation, and shutdown, and the
approximate frequency of each.

Vertex™ Evaporative Condenser Operation & Maintenance Manual –Unit Operation and Storage Page | 9
3. Unit Operation and Storage
Figure 1. Vertex™Evaporative Condenser with EC Fan System
Upper Casing Section
Basin Section
1
Factory Pre-Assembled Platforms with Perimeter Handrails
5
Access Door with Safety Handle and Step
2
Drift Eliminators
6
Internal Walkway
3
BranchLok™ Removal System
7
Fan Cover
3A
Feed Box Assembly
8
Water Guards
3B
Spray Branch
9
Pump
3C
Nozzles
10
Pump Riser Piping
4
Coil
11
Make-Up Valve Assembly
12
Float Ball
13
Strainer Assembly
14
EC Direct Drive Fan System Assembly
15
Terminal Box
Table 1. Vertex™ Evaporative Condenser with EC Fan System Parts List

Vertex™ Evaporative Condenser Operation & Maintenance Manual –Unit Operation and Storage Page | 10
Figure 2. Vertex™ Evaporative Condenser with Baltidrive®Power Train
Upper Casing Section
Basin Section
Baltidrive®Power Train
1
Factory Pre-Assembled Platforms
with Perimeter Handrails
5
Access Door with Safety
Handle and Step
A
Belt Set
2
Drift Eliminators
6
Internal Walkway
B
Fan Sheave
3
BranchLok™ Removal System
7
Partition Doors
C
Fan Sheave Bushing
3A
Feed Box Assembly
8
Pump
D
Fan Bushing
3B
Spray Branch
9
Pump Riser Piping
E
Axial Fan Assembly
3C
Nozzles
10
Make-Up Valve Assembly
F
Fan Shaft
4
Coil
11
Float Ball
G
Bearing Kit
12
Strainer Assembly
H
Mechanical Equipment Support
13
Air Intake Screens
I
Fan Cowl Assembly
14
Baltidrive®Power Train
J
Motor
K
Motor Sheave
L
Motor Sheave Bushing
M
Motor Base and Adjustment Rod Kit Assembly
Table 2. Vertex™ Evaporative Condenser with Baltidrive®Power Train Parts List

Vertex™ Evaporative Condenser Operation & Maintenance Manual –Unit Operation and Storage Page | 11
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.
Vertex™ Evaporative Condenser with EC Fan System
Basic Recommended Spare Parts
Parts to Consider if Extended Downtime is a
Concern
Basin Heater & LWCO (if equipped)
EC Direct Drive Fan System Assembly
Door Gaskets
Pump
Make-Up Valve Assembly & Float Ball
Spray Nozzles
Suction Strainer
Pump Seal Kit
Vertex™ Evaporative Condenser with Baltidrive®Power Train
Basic Recommended Spare Parts
Parts to Consider if Extended Downtime is a
Concern
Bearings
Fan and Fan Bushing
Bearing Greaser Refill Kit (if equipped)
Fan Shaft
Belts
Fan Motor
Basin Heater & LWCO
Pump
Door Gaskets
Make-Up Valve Assembly & Float Ball
Solenoid Valve (if unit equipped with EWLC)
Spray Nozzles
Suction Strainer
Sheave and Bushing Sets
Pump Seal Kit

Vertex™ Evaporative Condenser Operation & Maintenance Manual –Unit Operation and Storage Page | 12
Start-Up Procedure
Considerations for Initial Start-Up
•For units with independent fan control [standard on units with the BALTIDRIVE®Power Train], see Page 53.
•For units with VFDs, see Page 54.
•For units with vibration cutout switches, see Page 42.
General
•If the unit is mounted on vibration isolators or isolation rails (by others), refer to the vibration isolation manufacturer’s
guidelines before loading/unloading weight from the unit.
•Verify fans and the pump motor are disconnected, locked out, and tagged out.
•The unit must be level in both the length and width directions for proper operation.
Cleaning
•Drain the basin with the strainer in place.
•Remove all dirt and debris from the fan guard(s) and combined inlet shields.
•Inspect and clean all spray nozzles.
•Clean all the mechanical components, such as the fan and motor.
•Remove accumulated dirt and debris from the water guards.
•Flush the basin to remove any accumulated dirt and debris.
•Remove, clean, and replace the basin strainer.
Inspection
•Conduct external inspection of the equipment. Check for leaks, corrosion, and any structural damage.
•Conduct internal inspection of the equipment. Check for anything unusual such as structural or mechanical component
damage.
•Inspect piping and connections.
•Thoroughly inspect the fans for any mechanical or physical damage.
•At seasonal start-up or after prolonged shutdown, check the motor insulation with an insulation tester prior to the motor
start-up.
•Check and adjust the belt tension. Units equipped with the EC Fan System use direct drive motors and do not require belt
tension.

Vertex™ Evaporative Condenser Operation & Maintenance Manual –Unit Operation and Storage Page | 13
Start-Up
: 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.
: The operation, maintenance, and repair of this equipment shall be undertaken only
by personnel authorized and qualified to do so. All such personnel shall be thoroughly familiar with the
equipment, the associated system and controls, and the procedures set forth in this manual. Proper care,
personal protective equipment, procedures, and tools must be used in handling, lifting, installing, operating,
maintaining, and repairing this equipment to prevent personal injury and/or property damage.
: This equipment should never be operated without all fan screens, access panels,
and access doors in place.
NOTICE: BAC units are typically installed immediately after shipment, and many operate year-
round. However, if the unit is to be stored for a prolonged period either before or after
installation, certain precautions should be observed, as outlined in section Prolonged Outdoor
Storage on Page 15.
•For BALTIDRIVE®Power Train units only, prior to seasonal start-up, lubricate the motor base adjusting screw (see Figure
7on Page 23) and the fan shaft bearings (see Page 24). At initial start-up, no bearing lubrication is required since the
bearings are factory lubricated prior to shipment.
•For BALTIDRIVE®Power Train units only, apply RUST VETO®to steel shafts.
•Fill the basin with fresh water to the overflow level via the make-up valve.
•Set the make-up valve float so the water shuts off at the operating level (see Table 3 on Page 19).

Vertex™ Evaporative Condenser Operation & Maintenance Manual –Unit Operation and Storage Page | 14
•Execute one of the following biocide treatment programs while operating the circulating pump and prior to operating the
unit fans:
oResume treatment with the biocide that was used prior to shutdown. Operate the pump only while maintaining the
maximum recommended biocide residual for a sufficient duration (residual and time will vary with the biocide) as
recommended by the water treatment supplier. Start the fan only after this treatment period is completed.
oCheck the pH of the circulating water and, if necessary, adjust it to 7.0 - 7.6 pH. Then, running the pump only, treat
the system with sodium hypochlorite to maintain a level of 4 to 5 mg/l (ppm) free chlorine (as Cl2) over a six-hour
period. Test kits for measuring the free residual of chlorine are commercially available. Start the fan only after this
treatment period is completed.
•If the unit was supplied with redundant pump system refer to the initial startup instructions in section Redundant Pump
System (Optional) on Page 44.
•Start the unit pump and check for the proper rotation indicated by the arrow on the pump cover.
•On installations where the unit pump was not furnished by BAC, a globe valve should be installed in the pump discharge
line and the pump flow rate adjusted to the correct water flow and pressure (2.25 psig at spray header connection).
NOTICE: Spray system pressure greater than 10.0 psig may cause damage to the distribution
system.
•Check that the float operated make-up valve is operating freely. Closely monitor the water level and adjust as necessary
during the first 24 hours of operation.
•Inspect the nozzles and heat transfer section as described section Water Distribution System and Heat Transfer
Section on Page 26.
•For units with the BALTIDRIVE®Power Train, verify proper fan tip clearance. See section BALTIDRIVE®Power Train on
Page 17.
•Open the valve in the unit bleed line and adjust the bleed by closing or opening the valve until the desired bleed rate is
reached.
•For initial start-up, briefly energize the fan motor(s) and note the direction of rotation. The fan should rotate in the direction
indicated by the arrow on the fan cowl.
•Run the fan in manual mode for several minutes to check for any unusual noise or vibrations.
•For a 2-speed motor, check to ensure the starter includes a minimum 15 second time delay when switching from high
speed to low speed.
•Check the operation of the optional vibration cutout switch.
•Once the unit is operating, check the current and voltage of all three phases (legs) of the fan motor with a heat load on the
unit under warm ambient conditions. The current must not exceed the motor nameplate rating.
NOTICE: Check to ensure the controls for the fan motor are set to allow a maximum of six on-off
cycles per hour to prevent motor overload.

Vertex™ Evaporative Condenser Operation & Maintenance Manual –Unit Operation and Storage Page | 15
After 24 hours of operation under thermal load, perform the following services:
✓Check the unit for any unusual noises or vibrations.
✓Check the operating water level in the basins.
✓Adjust the make-up valve if necessary.
✓Check the belt tension and readjust if necessary.
✓Inspect the spray nozzles and heat transfer section.
Extended Shutdown
Perform the following services whenever the unit is shutdown in excess of three days:
•If the unit is mounted on vibration isolators or isolation rails (by others), refer to the manufacturer’s guidelines before
loading/unloading weight from the unit.
•Disconnect, lock out, and tag out the fans, pump, and motors.
•Close the shut-off valve in the make-up water line (supplied by others) and drain the basin and all exposed water piping.
Heat trace and insulate all exposed piping.
•To minimize the risk of biological contamination during shutdown, it is recommended the entire system be drained.
•Clean all debris, such as leaves and dirt, from the interior and exterior of the unit, including the combined inlet shields.
•Clean and flush the basin with the basin strainer in place.
•Leave the basin drain open so rain and melting snow will drain from the unit.
•Remove the bottom drain plug to the spray pump(s). Put the plug(s) in a marked plastic bag and attach to the spray
pump(s) for future use.
•Clean the basin strainer and re-install.
•Cover the fan discharge to keep out dirt and debris.
•Lubricate the fan shaft bearings, motor base, and motor base adjusting screw (if applicable).
•Apply RUST VETO®to steel shafts (for BALTIDRIVE®Power Train units only).
•Inspect the protective finish on the unit. Clean and refinish as required. Refer to section 5. Corrosion Protection on Page
29 for more details.
•Lockout the fan motor starting device in the “OFF” position to ensure personal safety in case of future inspection or
service.

Vertex™ Evaporative Condenser Operation & Maintenance Manual –Unit Operation and Storage Page | 16
Prolonged Outdoor Storage
Storage Preparation
NOTICE: Covering the unit with a clear plastic tarpaulin during storage can trap heat inside the
unit and cause damage to the PVC components. If units must be covered during storage, an
opaque, reflective tarp with vents should be used.
•Conduct the Extended Shutdown procedure on Page 15 if the unit is installed.
•Ensure the basin is fully drained and the drain is open.
•For storage prior to installation, all components and accessories, which sometimes ship inside the unit and are not a
permanent fixture in the basin, should be removed and stored indoors.
•Remove the bottom drain plug to the spray pump(s). Put the plug(s) in a marked plastic bag and attach to the spray
pump(s) for future use.
•Remove and store fan belts (if supplied) at room temperature. Tag belts appropriately for future identification.
•During storage, the coils should be charged with inert gas and capped. Note that coils with steel connections are charged
with 15 psig nitrogen at the factory prior to shipment.
•If the condenser is removed from the system, charge the coil with 15 psig of inert gas and cap the connections to reduce
the risk of internal corrosion.
•Apply a weather-resistant lubricant or heavy grease such as Anti-Seize (BAC Part # 160069) to all exposed threaded or
flanged connections and the adjustable motor base threaded rod.
•Insert desiccant bags into the control panel (if supplied) to absorb moisture. Seal the control panel for storage.
•Spray coat electrical component housings (if supplied) with a suitable protective coating, such as Cosmoline®
Weathershed, and individually cover them with plastic, taking care to leave openings for free air circulation.
•Inspect the protective finish on the unit. Clean and refinish as required. Refer to section 5. Corrosion Protection on Page
29 for more details.

Vertex™ Evaporative Condenser Operation & Maintenance Manual –Unit Operation and Storage Page | 17
Motor Recommendations
Figure 3. Vertex™ Evaporative Condenser with BALTIDRIVE® Powertrain Figure 4. Vertex™ Evaporative Condenser with EC Fan System
Electronically Commutated (EC) Motors
Vertex™ Evaporative Condenser EC motors are designed for storage at ambient temperatures of -40ºF to 176ºF (-40ºC to
80ºC). Prolonged periods of exposure above or below these specified conditions could degrade components of the motor and
cause malfunction or premature failure.
•Care must also be taken to protect the motor from flooding or from harmful chemical vapors.
•The storage area should be free from ambient vibration. Excessive vibration can cause damage.
•Keep stored motor(s) dry and protected from weather.
•Rotate the fan once per month.
•Precautions should be taken to prevent rodents, snakes, birds, or other small animals from nesting inside the motors. In
areas where they are prevalent, precautions must also be taken to prevent insects from gaining access to the interior of
the motor.
BALTIDRIVE®Power Train
BAC standard motors are designed for storage at ambient temperatures of -20ºF to 104ºF (-28.9ºC to 40ºC). Prolonged
periods of exposure above or below these specified conditions could degrade components of the motor and cause malfunction
or premature failure.
•Motors should be removed and stored inside whenever possible. When indoor storage is not possible the motors must be
covered with a tarpaulin. Do not use plastic or plastic film. This cover should extend below the motor and be secured;
however, it should not tightly wrap the motor. This will allow the captive air space to breathe, minimizing formation of
condensation.
•Care must also be taken to protect the motor from flooding or from harmful chemical vapors.
•The storage area should be free from ambient vibration. Excessive vibration can cause bearing damage.
•Precautions should be taken to prevent rodents, snakes, birds, or other small animals from nesting inside the motors. In
areas where they are prevalent, precautions must also be taken to prevent insects from gaining access to the interior of
the motor.

Vertex™ Evaporative Condenser Operation & Maintenance Manual –Unit Operation and Storage Page | 18
•If not stored indoors in a controlled environment, some form of heating must be utilized to prevent condensation from
accumulating in the motor. This heating should maintain the winding temperature at a minimum of 9ºF (5ºC) above the
ambient temperature of the surrounding environment, keeping it from dropping below the dew point where condensation
could form inside the motor. If space heaters are supplied, they should be energized. Request the required voltage and
transformer capacity from your local BAC Representative. A third option is to use an auxiliary heat source and keep the
winding warm by either convection or blowing warm air into the motor.
•Rotate the motor shaft monthly to redistribute bearing grease.
Maintenance Requirements During Storage
•Rotate all fans and motor shafts monthly by hand. Hand-turning will ensure that the shafts and bearings are free and will
redistribute grease within the bearings.
•Inspect the basin monthly to ensure that the drain is open and remove any leaves or debris that may have accumulated
on the water guards and in the basin.
•Inspect the axial fans annually to ensure the blades are tight and there is no obvious corrosion between the hub and the
fan blade.
•Inspect the rust preventative coating on all motor external machined surfaces including shaft extensions monthly. If
necessary, re-coat the surfaces with RUST VETO®.
Start-Up Preparation After Prolonged Storage
Keep in mind that start-up procedures after long periods of storage are just as important as pre-shutdown procedures.
•Motors should be thoroughly inspected, cleaned, and restored to pre-storage condition.
•Inspect axial fans prior to start-up to ensure that the blades are tight and that there is no obvious corrosion between the
hub and the fan blade. Do not energize the fans if there is obvious corrosion of fan components. Loose fan blades could
result in fan failure and possible injury or damage.
•Reinstall all fan belts, motors, door gaskets, and drain plugs (as applicable), and remove all protective coverings.
•For units stored prior to installation, conduct rigging procedures as directed in the unit’s Rigging and Assembly
Instructions, available on www.BaltimoreAircoil.com or by contacting your local BAC Representative.
•Perform an insulation test of motor windings to ensure satisfactory insulation resistance.
•Conduct full start-up procedure as stated in the Start-Up Procedure on Page 12. Be especially thorough for cleaning and
inspection prior to start-up.

Vertex™ Evaporative Condenser Operation & Maintenance Manual –Component Maintenance Procedures Page | 19
4. Component Maintenance Procedures
Basin
The basin is constructed from one of the following materials of construction and the following maintenance applies to all basin
materials of construction.
•Galvanized steel
•TriArmor®Corrosion Protection System
•Welded Type 304 stainless steel
Water Levels
•Height is measured from unit’s base (mounting point) to water level. Depth is measured from the interior basin floor to
water level.
•The operating water level in the basin will vary with system thermal load (evaporation rate), the bleed rate employed, and
the make-up water supply pressure.
•The make-up valve controls the operating level, which should be maintained at the levels shown in Table 3.
•Check the operating water level monthly and readjust the float when necessary to maintain the recommended operating
level.
Model Number
Operating
Depth (in)
Operating
Height (in)
Operating
Volume (gal)
Overflow
Volume (gal)
VRC-xxxxA-1012N-xx
9
15.43
254
479
VRC-xxxxA-1018N-xx
9
15.43
385
701
VRC-xxxxA-1024N-xx
9
15.43
508
959
VRC-xxxxA-1036N-xx
9
15.43
770
1,402
VRC-xxxxA-2012N-xx
9
15.43
508
959
VRC-xxxxA-2018N-xx
9
15.43
770
1,402
VRC-xxxxA-1212N-xx
9
15.43
254
521
VRC-xxxxA-1218N-xx
9
15.43
385
774
VRC-xxxxA-1224N-xx
9
15.43
508
1,042
VRC-xxxxA-1236N-xx
9
15.43
770
1,549
VRC-xxxxA-2412N-xx
9
15.43
508
1,042
VRC-xxxxA-2418N-xx
9
15.43
770
1,549
Table 3. Basin Water Levels (Measured from Inside the Basin)

Vertex™ Evaporative Condenser Operation & Maintenance Manual –Component Maintenance Procedures Page | 20
Inspection & Maintenance
: Openings and/or submerged obstructions may exist in the bottom of the
basin. Use caution when walking inside this equipment.
•Inspect the basin monthly. Remove trash or debris that may have accumulated in the basin or on the strainer.
•Quarterly, or more often, if necessary, drain, clean, and flush the entire basin with fresh water. This will remove the
sediment, which can collect in the basin during operation. If not removed, sediment can become corrosive and cause
deterioration of the protective finish of metallic basins.
oWhen flushing the basin, leave the strainer in place to prevent the sediment from re-entering the spray pump.
oRemove the strainer after the basin has been flushed.
oClean and replace the strainer before refilling the basin with fresh water.
oRemove accumulated dirt and debris from the water guards.
•Adjust the float to maintain the design operating level. See Table 3.
EC Fan System
For units supplied with electronically commutated (EC) motors, very little maintenance is required. As the fans are provided
with sealed bearings, lubrication is not required.
•With the fans running, check for any unusual noises or vibrations.
•Thoroughly inspect the fans for damaged or deteriorated fan blades and replace the fan system as required.
Electronically Commutated (EC) Fan Motors
An EC motor has been designed to accept an AC power supply and use onboard electronics to operate similarly to a
permanent magnet brushless DC motor. All EC motors provided by BAC have an onboard speed control module, eliminating
the need for VFDs. To optimize thermal efficiency, all fans will ramp up or down simultaneously.
Unit Mounted Electrical Panel
All EC motors are factory-wired to the unit-mounted electrical control panel. This panel provides a single location for a 3-phase
power connection, a 4-20 mA motor control signal, and an alarm feedback signal. Two LED lights, one for the ALARM (red)
and one for the OVERRIDE (yellow), are provided on the outside of the control panel. An override switch (ON/OFF) is provided
on the enclosure, allowing the operator to override an alarm condition and continue equipment operation.
Alarm Signal
The alarm light indicator (red) on the control panel indicates that one or more fans have had an event that is preventing them
from operating correctly. When the indicator illuminates, all fans will operate at a factory pre-set emergency speed, which is
around 40% of full speed.