ClimaCool IOM FLEX User Manual

ClimaCool IOM
FLEX SERIES
Water-Cooled Modular Chillers
Installation, Operation &
Maintenance Manual
®
ClimaCool works continually to improve its products. As a result, the design and specifications of each product at the time for order may be changed without notice and may not be as described herein. Please contact ClimaCool's Customer Service Department at (405) 745-3185 for specific information on the current design and specifications. Statements and other information contained herein are not express warranties and do not form the basis of any bargain between the parties, but are merely ClimaCool's opinion or commendation of its products.
Refer to www.climacoolcorp.com for complete warranty details.
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CONTENTS PAGES
Model Numbers/Safety . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1
Inspection Site Preparation Installation Dimensional Data Rigging and Lifting Service Clearances Vibration Isolation Electrical Connection Water Piping System Water Piping Configurations Hydronic Refrigeration (Drawing) Filling the Water System Water Treatment Condenser Water Temperature Requirements Strainer Systems Stainless Steel Strainer Option Automatic Timer Flush Package Option Pressure Differential Alarm Package Y Type and Basket Type Strainers Pre-Start Up Start Up Pre-Start Up Check List Start-Up and Warranty Registration Form Chiller Operation and Maintenance Heat Exchangers (Drawings) Operation Limitations Physical Data Application Parameters Compressor Information Refrigeration Circuit (Drawings) Refrigeration System Re-Processing Sequence of Operation Electrical Data Power Distribution (Drawing) Wiring Diagrams Troubleshooting Guide Warranty Information
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ClimaCool Modular Chillers
MODEL NUMBERS AND SPECIFICATIONS
Dimensions Refrigerant No. Of Nominal Model No. L x W x H (in.) Voltage Circuits Compressors Tons FLEX 30 41-7/8” x 29-1/2” x 77”* 208/230/3/60 2 2 30 FLEX 30 41-7/8” x 29-1/2” x 77 ”* 460/3/60 2 2 30 FLEX 30 41-7/8” x 29-1/2” x 77 ”* 575/3/60 2 2 30 FLEX 50 41-7/8” x 33-1/2” x 78 3/8”* 208/230/3/60 2 2 50 FLEX 50 41-7/8” x 33-1/2” x 78 3/8”* 460/3/60 2 2 50 FLEX 50 41-7/8” x 33-1/2” x 78 3/8”* 575/3/60 2 2 50 FLEX 65 43-5/8” x 33-1/2” x 78 3/8”* 208/230/3/60 2 2 65 FLEX 65 43-5/8” x 33-1/2” x 78 3/8”* 460/3/60 2 2 65 FLEX 65 43-5/8” x 33-1/2” x 78 3/8”* 575/3/60 2 2 65
* Dimensions with covers.
SAFETY WARNING �
High voltage is used to operate this equipment. Failure to observe standard electrical safety procedures may result in serious injury. Only persons qualified and / or properly trained should attempt to install, operate and maintain this equipment. These chillers come fully charged with refrigerant. Installation, and start – up should be accomplished by technicians who are fully certified to handle refrigerants, as required by 40 CFR Part 82, subpart F of the Recycling and Emissions Reduction Act. Scroll compressors are used in this equipment. Phase verification is required for proper rotation direction. Incorrect rotation will result in elevated sound and internal overload trip failure.
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Inspection
INSPECTION
Allow a sufficient amount of time to carefully follow these instructions to assure warranty coverage.
During inspection of the equipment remove the top doors to check the equipment for any damage during shipment. Inspect wiring connections, lines from expansion devices, thermostats, and pressure switches for damage.
General
During any correspondence concerning this machine, always reference the full model and serial numbers of your modules.
Receipt of the ClimaCool Modules
Upon receipt of the equipment, carefully check the shipment against the bill of lading. Make sure all modules ordered have been received. Inspect the carton or crating of each module, and inspect each module for damage. You must make
proper notation of any shortages or damage on all copies of the freight bill for your records. Make sure the carrier completes a common carrier inspection report listing any shortages or damage.
Note: It is the responsibility of the recipient of the modules to file all necessary claims with the carrier. In addition, please notify the ClimaCool Customer Service Department of all damage immediately. Refer to the back cover for the Customer Service Department phone number.
Handling of Modules
The packaging allows for handling by fork lift or pallet jack (only lift the module from the side). See Lifting and Transporting Modules (Fig. 3) on page 5. Caution: modules
ARE TOP HEAVY. Please use caution when rigging or moving.
Rigging for Lifting
Each module should be lifted by using lift straps threaded through each top header tube. See page 5 - Rigging and Lifting Procedures.
WARNING
To avoid the release of refrigerant into the atmosphere, the refrigerant circuit of this unit must be serviced only by technicians who meet local, state and federal proficiency requirements.
All refrigerant discharged from this unit must be recovered WITHOUT EXCEPTION. Technicians must follow industry accepted guidelines and all local, state and federal statutes for the recovery and disposal of refrigerants.
If a compressor is removed from this unit, system refrigerant circuit oil will remain in the compressor. To avoid leakage of compressor oil, the refrigerant lines of the compressor must be sealed after it is removed.
Storage
Equipment should be stored as shipped in a clean, dry area. Store modules in an upright position at all times. Plastic wrap should be left on until the module is ready to be installed.
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Site Preparation/Installation
Preparing for Installation.
Prepare the modules for installation by carefully removing the module's packaging, unbolt the module from the skid, and lift the module with a crane or hoist into its final position.
Hardware kits are shipped in separate packaging along with the modules. Make sure the hardware kits are on site when connecting the modules.
SITE PREPARATION
Base Requirements
The minimum base requirement for the ClimaCool chiller is a level surface which has been checked to ensure that it is capable of bearing the combined operating weight of the modules (see page 4).
Anti-Vibration Mountings
Although the compressors are installed on anti-vibration mountings, further isolation of the chiller from the structure can be achieved by installing vibration-eliminating springs or pads under the base rails on which the chiller will rest. (see page 7 - Vibration Isolation).
A factory supplied fastener kit is provided for the adjoining of each module. Each kit contains (4) gaskets, (32) ¾” fully threaded studs, (64) heavy duty hex nuts, (64) lock washers, and (64) flat washers.
A ¾"-10 tap should be run through each weld nut located at the bottom rear chiller header flange of each module. Screw the fully threaded studs into these four weld nut locations. At all other flange hole locations, insert fully threaded studs, attach washers, lock washers, and nuts from the fastener kit.
The gasket should be placed between the first reference module and the next module. Slide the next module into position while guiding the fully threaded studs into the flange holes of the next module. Finally, the washers, lock washers, and nuts are applied to the other end of the fully threaded studs to securely fasten the module flanges.
Tighten the flange bolts in a diametrically opposite pattern, in such a way as to pull the modules together evenly. It will be necessary to use a ¾" (12 point) box-end wrench when tightening. As each module is added, the alignment of the whole package should be confirmed.
Service Access
The minimum space required for electrical panel service is 36" in the front of each module. Allow 24" service clearance in the back of the module for refrigeration access. Allow a minimum of 18” of clearance above the module for service. Allow 12” side clearance of any ClimaCool modular chiller system (see Service Clearances page 6). Local building or electrical codes may require additional clearance.
Draining
When performing standard maintenance procedures such as flushing heat exchanger, it will be necessary to close off a section of a module. ClimaCool modular chillers come equipped with isolation valves for this purpose. Access to a floor drain is helpful when performing standard maintenance procedures.
INSTALLATION
Assembling Modules
Use of (2) 4” rails (minimum size) is required for ease of installation. One of the end modules should be chosen as the reference module and carefully located.
Header and Flange Insulation
Chilled water piping is pre-insulated on each module at the factory with ¾” closed cell foam rubber. After the bolting the modules together, the installer must apply insulation on site over the chilled water header connection flanges.
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ClimaCool Dimensional Data
The ClimaCool® Modular Chiller -
Module Dimensional Data -
Models 30, 50 & 65 - FLEX Series
Model Voltage Depth Width Height Height (w/covers) Weight
FLEX (inches) (inches) (inches) (inches) (lbs.) (lbs.)
30 208/230/3/60 41-7/8 29-1/2 72-7/8 77 1,669 1,825
30
30
50
50
50
65
65 460/3/60 43-5/8 33-1/2 76-5/8 78-3/8 1,990 2,280
65 575/3/60
NOTES:
1. Unit shipping weight includes refrigerant charge, compressor oil, and shipping base skid. Add two inches to base dimensions for shipping skid.
2. Operational weight includes refrigerant charge, compressor oil and water.
460/3/60 41-7/8 29-1/2 72-7/8 77 1,669 1,825
575/3/60 41-7/8 29-1/2 72-7/8 77 1,669 1,825
208/230/3/60 41-7/8 33-1/2 76-5/8 78-3/8 1,873 2,163
460/3/60 41-7/8 33-1/2 76-5/8 78-3/8 1,873 2,163
575/3/60 41-7/8 33-1/2 76-5/8 78-3/8 1,873 2,163
208/230/3/60 43-5/8 33-1/2 76-5/8 78-3/8 1,990 2,280
43-5/8 33-1/2 76-5/8 78-3/8 1,990 2,280
ISO-9001 Certified
1
Oper. Weight2
Meets NYC Fire Code
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The ClimaCool®Modular Chiller -
Rigging and Lifting Procedures
Rigging (Figures 1 and 2)
Each module should be lifted by using lift straps threaded through each top header tube.
ClimaCool Rigging and Lifting
A spreader bar should be utilized when rigging with
covers in place.
Lifting and Transporting Modules (Figure 3)
When lifting and transporting the module, it is very im-
for lifting and transporting may damage the module and void the warranty.
CAUTION
Units are top heavy. Please use caution when rigging or moving.
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ClimaCool Service Clearances
The ClimaCool® Modular Chiller -
Service Clearances
Recommended Clearances
1. Allow 36” clearance for electrical panels and 24” clearance for rear service access to modules.
2. Allow a minimum of 18" height clearance for service and 12” for side clerances.
3. Local building or electrical codes may require additional clearance. Consult applicable codes.
Modular Chiller Bank Dimensions -
Model Dimensions
FLEX Width (ft./inches) Depth Height
30 50 65 30 50 65 30 50 65 30 50 65
1 module
2 modules
3 modules
4 modules
5 modules
6 modules
7 modules
NOTES:
1. Modular chiller bank width dimensions above include (1/8") between modules, plus (1-1/2") for required blank off plate fl anges when piping for a direct return (Refer to Water Piping Confi guration - Figure 1). Example: (5) FLEX 65 modules 167-1/2" width + 1-1/2" (Blank off plates) + 5 x 1/8" (fl ange connection gaskets) = 169-5/8" (14' 1-5/8").
2. When piping 1 to 5 or more than 5 modules, use reverse return (Refer to Water Piping Confi guration - Figure 2). Example: (7) FLEX 30 modules 206-1/2" width + 1-1/2" (Blank off plates left) + 1-1/2" (Blank off plates right) + 8 x 1/8" (fl ange connection gaskets) = 210-1/2" (17' 6-1/2").
2’ 7-1/8” 2’ 11-1/8” 2’ 11-1/8”
5’ 3/4” 5’ 8-3/4” 5’ 8-3/4”
7’ 6-3/8” 8’ 6-3/8” 8’ 6-3/8”
10’ 0” 11’ 4” 11’ 4”
12’ 5-5/8” 14’ 1-5/8” 14’ 1-5/8”
15’ 7/8” 17’ 7/8” 17’ 7/8”
17’ 6-1/2”
19’ 10-1/2”19’ 10-1/2” 19’ 10-1/2”
w/Connnection Flange Gaskets and Blank Off Plates
(w/o panels) Height (w/ panels)
41-7/8” 41-7/8” 43-5/8” 72-7/8” 76-3/4” 76-3/4” 77” 78-3/8” 78-3/8”
41-7/8” 41-7/8” 43-5/8” 72-7/8” 76-3/4” 76-3/4” 77” 78-3/8” 78-3/8”
41-7/8” 41-7/8” 43-5/8” 72-7/8” 76-3/4” 76-3/4” 77” 78-3/8” 78-3/8”
41-7/8” 41-7/8” 43-5/8” 72-7/8” 76-3/4” 76-3/4” 77” 78-3/8” 78-3/8”
41-7/8” 41-7/8” 43-5/8” 72-7/8” 76-3/4” 76-3/4” 77” 78-3/8” 78-3/8”
41-7/8” 41-7/8” 43-5/8” 72-7/8” 76-3/4” 76-3/4” 77” 78-3/8” 78-3/8”
41-7/8” 41-7/8” 43-5/8” 72-7/8” 76-3/4” 76-3/4” 77” 78-3/8” 78-3/8”
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The ClimaCool® Modular Chiller -
Mounting Rail and Vibration Isolation
Due to the low vibration of the modules, ClimaCool® does not require the application of spring isolators or pads. Should isolators or pads be desired, install in accordance with Figs. 1 and 2.
Figure 1 - Spring Vibration Isolators Option
4” Rail Minimum Required (by others)
ClimaCool Vibration Isolation
Figure 2 - Vibration Isolation Pads Option
4” Rail Minimum Required (by others)
NOTE: la u div id ni rep reenigne larutcurts de fiilauq a yb denimreted eb ot si noitubirtsid thgiew dna eziS job requirements.
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Electrical Connection
DANGER
!
• Electric shock hazard!
• May result in injury or death!
• Disconnect power supply(ies) before servicing!
• Refer servicing to qualified service personnel.
Risque de choc électrique!
Résultat de mai dans dommages ou la mort!
Debrancher avant d’entreprendre le dépannage de l’appareil!
Consulter un réparateur qualifie pour le dépannage.
DANGER
!
Connecting the Water Piping to Modules
Water piping must be installed in accordance with applicable codes and standards. Flexible connections and supports should be installed to prevent load or stress on the module's flange connections (see page 10 - Water Piping Configurations).
ELECTRICAL CONNECTION
The compliance of the installation to relevant codes is the responsibility of the installer. Before carrying out any electrical work, confirm that the main supply is isolated. The installer must ensure that the correct electrical drawing is available.
Inter-Module Power Wiring
The power for all modules is taken from a fused supply within the main panel. A typical power wiring is located on page 43 - Power Distribution.
Inter-Module Control Wiring
After the power wiring has been run, the control wires can then be connected. The wires should be carefully marked and installed in the terminals shown on the wiring diagram. External control wires should be connected to the relevant terminals and devices. Wiring to the sensors should not be run with the power wiring.
Control Wiring Sizes and Lengths
When running control wires, proper gauged wires should be used. With 14 AWG the maximum distance allowed is 250 feet. With 16 AWG, 100 feet is acceptable. You should not exceed 50 feet when using 18 AWG. These lengths and gauges are for the use of 24 volt control circuits.
Incoming Power Wiring
Incoming power should be supplied from a suitable disconnect switch. Proper grounding of the module is mandatory.
Electrical Phase Sequencing
Proper clockwise rotation for scroll compressor motors is important to prevent damaging the compressors. If you have access to a phase sequence indicating instrument it is recommended to use this following the manufactures directions. If not, you may “bump test” the compressors one at a time with pressure gauges attached to the high and low gauge ports of the compressors to check for proper rotation. Energize the compressor for a few seconds to ensure the discharge pressure gauge increases significantly. If the discharge pressure does not increase, proper rotation is reversed. You can quickly reverse compressor rotation by opening the main electrical disconnect and switching any two of the main power supply leads feeding that compressor's contactor.
Proper Voltage Balance
Occasionally, in three phase circuits, a voltage imbalance occurs between phases. It is not recommended to operate equipment when an imbalance greater than 2% occurs. This causes motors to run at high temperatures and may affect their longevity. The following example describes how to calculate the average voltage of the three phases to see if the imbalance is greater than 2%.
Example: Line one = 226v Line two = 230v Line three = 228v The average is: 226+230+228 = 228v 3 Next, 100(228-226) = 0.9% 228 The voltage imbalance of the three phase circuit is 0.9%. This is well under the 2% range.
Checking
Before power is applied to the system, the wiring should be visually inspected for loose connections or frayed terminal connections. All control wiring should follow wiring instructions supplied in the project submittal package.
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Water Piping System
WATER PIPING SYSTEM
As with any water system, it is important that the system is clean. Care should be taken to maintain a clean system. The installing contractor should remove weld scale, rust and contamination during the fabrication of the piping system. We recommend the use of an alkaline flush of the piping system prior to start-up.
Necessary Components
All items depicted in figure 1 and 2 on page 10, other than the modules themselves, are provided by others as optional accessories and must be installed with the hydronics system. Several of these key components for both condenser and chilled water systems are: water pump, strainer, isolation valve, flow switch, temperature sensor wells, and pressure taps.
Pressure Taps
The installer must provide access ports for connecting flow switches (differential pressure or paddle style) for both the condenser and chilled water systems (see page 10 - Water Piping Configurations).
Isolation Valves
It is recommended to provide water isolation valves for proper isolation and maintenance of the chiller, pump, and strainer (see page 10 - Water Piping Configurations).
Flow Switch - Required
It is mandatory that differential pressure flow switches are installed in both the chilled and condenser water circuits. These flow switches are shown on page 10 - Water Piping Configurations.
Temperature Sensor Wells
Four temperature sensors and wells are provided with each ClimaCool chiller system (chilled water inlet, chilled water outlet, condenser water inlet, condenser water outlet). The installing contractor must install these temperature sensor wells as shown in figures 1 and 2 on page 10.
Strainers - (Minimum 60 Mesh Screen Required)
ClimaCool chillers employ brazed plate heat exchangers which are extremely sensitive to debris. Therefore, it is
mandatory that all condenser and chilled water systems include a strainer with a minimum of 60 mesh screen for proper filtration. The strainers must be installed as shown in Water Piping Configurations (see page 10).
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ClimaCool Water Piping Configurations
The ClimaCool® Modular Chiller -
Field Piping Direct Return - 1 to 5 Modules (Figure 1)
PressureTaps
with Shutoff Valves
& Gauges
60” Sensor Location
(Field-Installed)
PressureTap
w/Shutoff
Valve &
Gauge
Unit 1
Flow In
Flow Out
Flow Switch
Isolation Valves
Pump
Thermometer Well
Isolation Valve
Strainer
Thermometer Well
Unit 2 Unit 3 Unit 5Unit 4
Blank Off Plates
Field Piping Reverse Return - (Preferred 1 to 5 modules) Required for 6 to 7 Modules (Figure 2)
Pressure Taps with Shutoff Valves
Unit 1 Unit 2 Unit 3 Unit 7Unit 6Unit 5Unit 4
Blank Off Plate
Isolation Valves
Pump
Flow In
Strainer
Thermometer Well
NOTES:
1. Figures 1 and 2 are required piping for proper water regulation and distribution through ClimaCool
PressureTap
w/Shutoff
Valve &
Gauge
®
modular chillers.
2. Module order and incoming/outgoing water fl ow as shown in both Figure 1 and 2 can be set up as either a left-to-right or right-to-left confi guration.
3. Condenser Hydronic Circuit shown. Piping confi gurations are similar for the chilled water hydronic circuit.
4. For condenser and chilled water (evaporator) inlet/outlet location dimensions, refer to Module Dimensional Data.
5. A fl ow switch (supplied by others) is a required safety device for ClimaCool
®
modular chillers on the chilled and condenser
water circuits.
6. Maximum water fl ow rates for both evaporator and condenser water header systems in one bank of modules is 1000 GPM.
7. The chilled water piping on each module is pre-insulated at the factory with ¾” closed cell foam rubber. Insulation (3/4”) on the chilled water header connection flanges is to be applied in the field by the installer, after the modules are bolted together on site.
& Gauges
60” Sensor Location
(Field-Installed)
Blank Off Plate
Thermometer Well
Isolation Valves
Flow Switch
Flow Out
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The ClimaCool® Modular Chiller -
Figure 1 - Condenser Hydronic Circuit
ClimaCool Hydronic Refrigeration
Isolation Ball Valve (2 or 2-1/2”)
To Cooling Tower
Header
From Cooling Tower
Header
Isolation Ball Valve (2 or 2-1/2”)
Figure 2 - Chilled Water Circuit
Isolation Ball Valve (2 or 2-1/2”)
Chilled Water Inlet
Header
Pete’s Port
Service Port (3/4”)Pete’s Port
Service Port (3/4”)
Heat Exchanger
Service Port (3/4”)Pete’s Port
Refrigerant Circuit #1
Refrigerant Circuit #2
Refrigerant Circuit #1
Chilled Water Outlet
Header
Isolation Ball Valve (2 or 2-1/2”)
Cap Tube to Low Limit
Protection Thermostat
Pete’s Port
Service Port (3/4”)
Sensor Well (internal)
Heat Exchanger
NOTE: Figures 1 and 2 depict hydronic piping in each ClimaCool® chiller module.
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Refrigerant Circuit #2
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Filling the Water System Pre-Start Up
FILLING THE WATER SYSTEMS
It is imperative that the water systems are free from debris prior to initial operation. See the page 15 ­Water Treatment section for a comprehensive list of precautions.
Filling, Purging and Leak Testing the System
After the water systems have been properly installed a visual inspection should be made to all joints for tightness. If the chiller is to be installed in an existing system, the cleanliness of the existing system can be judged from the operating conditions of the present machines. The cooling tower in particular, should be inspected and cleaned if required. It is a good practice to at least flush the existing system and ideally, to acid wash the system before connecting a new chiller.
We recommend the following sequence to fill and leak check the water systems:
1. Close all isolation valves inside each modular chiller.
2. Ensure that all drain valves are closed and that all water main isolation valves are opened.
3. The system should be filled with clean water send through a strainer and the system checked for leaks.
4. Once the main water lines and the chiller headers are filled with clean water, purge and repeat the filling process several times.
5. Open the isolation valves inside each modular chiller and repeat the filling process, this time also checking for leaks inside each module.
6. Following the final filling and leak checking procedure, air should be purged from the system.
4. After several hours of operation, the strainer should be isolated and cleaned.
5. Step 4 should be repeated until there is no more debris being collected by the strainer.
6. Finally, open all isolation valves inside each modular chiller and repeat step 4 and 5.
If it is not possible to install the bypass line in step 1 above, it is recommended to drain out the initial fill of water to help flush out debris. The chiller isolating valves should be closed to prevent debris from being washed into the chiller as the water drains out. Before refilling and purging the system again, the strainers should be removed and cleaned. This action should be repeated until there is no more debris being collected by the strainer.
Starting the Pumps
Follow manufacturer's recommendations when staring the pumps for the first time. The system should be checked for leaks and air purged with the pumps in operation. The pressure drop across the heat exchangers will give a good indication of flow through the system (see page 34). This should be immediately checked against the expected pressure drop for the flow rate required. If the pressure drop begins to fall and the flow rate is falling, this could indicate the need to clean the strainers.
Cleaning the System
We recommend the following sequence to properly clean the water systems:
1. If possible, install a temporary bypass line between the supply and return water lines of both water systems prior to cleaning the system.
2. Close all isolation valves inside each modular chiller before engaging the main water pumps.
3. The pumps should be run with the strainer in place (see the Starting the Pumps section for proper pump startup). All external hydronic branches should be open to all devices in the system.
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Water Treatment
Table 1 - Water Quality Parameters
®
Application Parameters
WATER TREATMENT
Proper water treatment is a specialized industry. We recommend consulting an expert in this field to analyze the water for compliance with the water quality parameters listed in Table 1 below. The material used in the ClimaCool chiller exposed to the water are type 316 stainless steel, pure copper, and carbon steel. Other materials may exist external to the ClimaCool chiller. It is the users responsibility to ensure these materials are compatible with the treated water. Failure to provide proper water quality will void the ClimaCool module's warranty.
It is further recommended to seek an experts advice to specify the appropriate water treatment required. Typical additives to hydronic systems include rust inhibitors, scaling preventative, antimicrobial growth agents, and algae preventatives. Anti-freeze solutions may also be used to lower the freezing point.
Heavily-Contaminated Water
In such instances whereby the particulates in the water are excessive it is recommended to install an intermediate plate & frame heat exchanger to isolate the ClimaCool chiller from the building water system.
Other Considerations
The following considerations are listed to help achieve system longevity.
Cooling Tower
The cooling tower should be located away from sources of external contaminates such as trees, dust, or grass cuttings. Insect infiltration can be reduced by eliminating lights near the tower. A periodic visual inspection of the tower system should be made and contaminates removed as required.
Table 1 - Water Quality Parameters
WATER CONTAINING CONCENTRATION
Sulphate Less Than 200 ppm
pH 7.0 – 9.0
Chlorides Less Than 200 ppm
Nitrate Less Than 100 ppm
Iron Less Than 4.5 mg/l
Ammonia Less Than 2.0 mg/l
Manganese Less Than 0.1 mg/l
Dissolved Solids Less Than 1000 mg/l
CaCO3 Hardness 30 – 500 ppm
CaCO3 Alkalinity 30 – 500 ppm
CAUTION
• Excessive Chlorine, Undissolved Solids and other improper water quality conditions
WILL DAMAGE the internal heat exchanger and WILL VOID YOUR WARRANTY!
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