USER GUIDE UGH041-0613 www.conairgroup.com EP2 Series Portable Chillers Portable and Remote Condenser Chillers 4 to 43 tons Corporate Office: 724.584.5500 Instant Access 24/7 (Parts and Service): 800.458.1960 Parts and Service: 814.437.
Thank you for purchasing Conair equipment. This manual is addressed to operators and qualified technicians to ensure correct use of this Conair equipment. IMPORTANT: THIS MANUAL MUST BE READ BEFORE INSTALLATION. KEEP THIS MANUAL IN A PLACE ACCESSIBLE FOR ALL OPERATORS. It’s a good idea to record the model and serial number(s) of your equipment and the date you received it in the User Guide.
Table of Contents Foreword ................................................................................................................................. 1 Safety Guidelines ..................................................................................................................... 2 Installation............................................................................................................................... 2 Receiving Inspection.....................................................
Autostart Signal LED ................................................................................................................... 26 Pump LED ................................................................................................................................... 26 Hot Gas Bypass LED .................................................................................................................... 26 Compressor #1 LED .......................................................................
Coolant Flow Switch ................................................................................................................... 46 Crankcase Heater ....................................................................................................................... 46 Evaporator .................................................................................................................................. 46 Hot Gas Bypass Valve ...................................................................
Foreword The intent of this manual is to serve as a guide for placing your portable chiller in service and operating and maintaining it properly. Improper installation can lead to poor equipment performance or severe equipment damage. Failure to follow the installation instructions may result in damage not covered by your warranty. It is extremely important that a qualified refrigeration installation contractor perform all installation line sizing and piping.
Safety Guidelines Observe all safety precautions during installation, start‐up, and service of this equipment due to the presence of high voltage and refrigerant charge. Only qualified personnel should install, start‐up, and service this equipment. When working on this equipment, observe precautions in literature, and on tags, stickers, and labels located on the equipment. Wear work gloves and safety glasses. WARNING: This equipment contains hazardous voltages that can cause severe injury or death.
Rigging, Handling, and Locating Equipment The units have either a formed sheet metal enclosure or a welded tube steel frame. Use proper rigging methods to prevent damage to components. Avoid impact loading caused by sudden jerking when lifting or lowering the chiller. Use pads on any abrasive surface contact areas. The frame supporting the unit is for positioning the unit with a crane or a forklift. Please refer to the drawings provided with the chiller for chiller rigging details.
Voltage imbalance is determined using the following calculations: % Imbalance = (Vavg – Vx) x 100 / Vavg Vavg = (V1 + V2 + V3) / 3 Vx = phase with greatest difference from Vavg For example, if the three measured voltages were 198, 207, and 204 volts, the average would be: (198 + 207 + 204) / 3 = 203 The percentage of imbalance is then: (203 – 198) x 100 / 203 = 2.46 % This exceeds the maximum allowable voltage imbalance of 2%.
fouling by contaminants in the condenser water stream occurs, performance is negatively affected. In order to reduce maintenance costs and chiller downtime, a water treatment program is highly recommended for the condenser cooling water. If condenser plugging occurs, contact our Customer Service Department for assistance in the proper procedure for cleaning out the condenser. Caution: The use of untreated or improperly treated water in a chiller can result in scaling, erosion, algae, or slime buildup.
Figure 1 – Condenser Water Pressure Drop Curves (EP2W-05 thru EP2W-15) Condenser Water Pressure Drop Base on water at 85°F (29.4°C) 45.0 EP2W‐10 40.0 EP2W‐15 35.0 Pressure Drop (psi) 30.0 EP2W‐05 25.0 EP2W‐08 20.0 15.0 10.0 5.0 0.0 0.0 10.0 20.0 30.0 40.0 50.0 60.0 Flow (gpm) Corporate Office: 724.584.5500 Instant Access 24/7 (Parts and Service): 800.458.1960 Parts and Service: 814.437.6861 6 70.
Figure 2 – Condenser Water Pressure Drop Curves (EP2W-20 thru EP2W-40) Condenser Water Pressure Drop Base on water at 85°F (29.4°C) 50.0 EP2W‐40 45.0 EP2W‐35 40.0 Pressure Drop (psi) 35.0 30.0 EP2W‐30 25.0 20.0 EP2W‐20 EP2W‐25 15.0 10.0 5.0 0.0 0.0 25.0 50.0 75.0 100.0 125.0 150.0 Flow (gpm) Corporate Office: 724.584.5500 Instant Access 24/7 (Parts and Service): 800.458.1960 Parts and Service: 814.437.6861 7 175.
Air‐Cooled Chillers Condenser Air This section only applies to air‐cooled chillers. In order to accommodate the air‐cooled condenser, the chiller must be located in a well‐ventilated area. A minimum of three feet (914.4 mm) of clearance is required at both the condenser air inlet and condenser air discharge. Improper clearance or poor ventilation will reduce the cooling capacity of the chiller and may cause high refrigerant pressure problems.
when piping is overhead with a total run length over 90 feet (27 M) there should be a valve in the supply line and an inverted P trap with a vacuum break valve installed as shown in Figure 3. Figure 3 – Recommended Overhead Piping 12 inches above highest point in piping system 1/2 inch vacum break valve Check valve NOTE: If piping is above chiller and exceeds 90 feet in total length, install an inverted P-trap and vacuum break valve in return line and add a check valve to the supply line.
flow rate must change at a rate of no greater than 10% per minute in order to maintain an acceptable level of temperature control. This is a practical amount of water which typically buffers fluctuations in the process enough that the chiller will generally see fairly gradual rates of change in the inlet water temperature and will be able to accurately load or unload the compressor(s) which in turn will allow for very consistent and stable supply temperatures to the process.
Figure 4 – Standard Flow Unit Coolant Pressure Drop Curve (EP2-04 and EP2-05) Standard Unit Coolant Pressure Drop Based on water at 50°F (10°C) 30 EP2‐05 EP2‐04 25 Pressure Drop (psi) 20 15 10 5 0 0 5 10 15 20 Flow (gpm) Corporate Office: 724.584.5500 Instant Access 24/7 (Parts and Service): 800.458.1960 Parts and Service: 814.437.
Figure 5 – High Flow Unit Coolant Pressure Drop Curve (EP2-04 and EP2-05) High Flow Unit Coolant Pressure Drop Base on water at 50°F (10°C) 30 EP2‐04 & EP2‐05 25 Pressure Drop (psi) 20 15 10 5 0 0 5 10 15 20 25 30 35 Flow (gpm) Corporate Office: 724.584.5500 Instant Access 24/7 (Parts and Service): 800.458.1960 Parts and Service: 814.437.
Figure 6 – Standard Flow Unit Coolant Pressure Drop Curve (EP2-08 thru EP2-15) Standard Unit Coolant Pressure Drop Based on water at 50°F (10°C) 30 EP2‐08 EP2‐10 EP2‐13 EP2‐15 25 Pressure Drop (psi) 20 15 10 5 0 0 10 20 30 40 50 60 Flow (gpm) Corporate Office: 724.584.5500 Instant Access 24/7 (Parts and Service): 800.458.1960 Parts and Service: 814.437.
Figure 7 – High Flow Unit Coolant Pressure Drop Curve (EP2-08 thru EP2-15) High Flow Unit Coolant Pressure Drop Based on water at 50°F (10°C) 30 EP2‐08 EP2‐13 EP2‐10 EP2‐15 25 Pressure Drop (psi) 20 15 10 5 0 0 10 20 30 40 50 60 70 80 90 100 Flow (gpm) Corporate Office: 724.584.5500 Instant Access 24/7 (Parts and Service): 800.458.1960 Parts and Service: 814.437.
Figure 8 – Standard Flow Unit Coolant Pressure Drop Curve (EP2-20 thru EP2-40) Standard Unit Coolant Pressure Drop Based on water at 50°F (10°C) 30 EP2‐20 EP2‐25 EP2‐30 EP2‐35 125 150 EP2‐40 25 Pressure Drop (psi) 20 15 10 5 0 0 25 50 75 100 Flow (gpm) Corporate Office: 724.584.5500 Instant Access 24/7 (Parts and Service): 800.458.1960 Parts and Service: 814.437.
Figure 9 – High Flow Unit Coolant Pressure Drop Curves (EP2-20 thru EP2-40) High Flow Unit Coolant Pressure Drop Based on water at 50°F (10°C) 30 EP2‐35 EP2‐30 EP2‐20 EP2‐25 EP2‐40 25 Pressure Drop (psi) 20 15 10 5 0 0 25 50 75 100 125 150 175 Flow (gpm) Corporate Office: 724.584.5500 Instant Access 24/7 (Parts and Service): 800.458.1960 Parts and Service: 814.437.
Figure 10 – EP2 Series Pump Curves Pump Curves (60 Hz) Water at 50°F (10 C) Flow (lpm) 0 100 200 300 400 500 600 120.0 8.0 110.0 7.0 100.0 90.0 6.0 80.0 Pressure (psi) 60.0 10 hp 3 hp 2‐stage 4.0 50.0 3.0 40.0 5 hp 3 hp 5 hp 2‐stage 30.0 2.0 1½ hp 7½ hp 20.0 1.0 10.0 0.0 0.0 0 20 40 60 80 100 120 140 Flow (gpm) Corporate Office: 724.584.5500 Instant Access 24/7 (Parts and Service): 800.458.1960 Parts and Service: 814.437.6861 17 160 Pressure (bar) 5.0 70.
System Fluid Freeze Protection For applications where system fluid will be exposed to ambient conditions of 32°F (0°C) or colder and/or the setpoint of the system will be below 45°F (7.2°C), antifreeze must be added to the system fluid to protect the chiller and system piping from potential damage. The amount of antifreeze will vary depending on the actual desired operating conditions and should be enough to provide freeze protection to temperatures 15°F (8.
Operating Principles Coolant Circuit The coolant pump, external to the chiller, circulates coolant through the process piping and then back to the chiller. Upon entering the chiller, the coolant will pass through a Y‐Strainer that filters the process fluid before entering the evaporator. Heat transferred from the coolant to the refrigerant occurs in the evaporator.
Start‐Up Every unit is factory set to deliver chilled water in accordance with the standard operating specifications for that particular chiller. Due to variables involved with different applications and different installations, minor adjustments may be required during the initial start‐up to ensure proper operation. The following startup procedure should be followed in sequence. If trouble is encountered during start‐up, the fault can usually be traced to one of the control or safety devices.
5. Charge the chiller with refrigerant. For EP2R chillers, please refer to the EP2R Series Chiller Remote Air‐Cooled Condenser Installation Guidelines Manual to determine the required refrigerant charge. EP2A and EP2W chillers come factory charged and should require no additional refrigerant. 6. (EP2R Models Only) Check the remote condenser main power and control wiring to ensure all connections are secure. 7. Verify that all refrigerant valves are open.
12. Set water flow through the evaporator as indicated in Table 1 (on page 5) using a discharge throttling valve or flow control valve (by others). The valve should be the same size as the To Process connection of the chiller. A significant increase in flow beyond the recommended rate may damage the evaporator and create excessive pressure drops that influence the overall efficiency of the system. 13. Set the desired leaving water temperature on the control panel.
Microprocesser Controller Operation The chiller includes a microprocessor controller to perform all control functions directly from the front panel. When Control Power is applied, the controller initiates a diagnostic test of each indicating light and display segment which momentary lights them sequentially. As part of this initial diagnostic test, the program revision level display in the temperature display for a moment.
Start Button Depressing the Start button will start the pump and enable the compressor. The compressor (and condenser fans if the chiller is air cooled) will start only if the microprocessor is calling for cooling because the actual To Process temperature is higher than the Setpoint temperature. If the Autostart feature is enabled, the Autostart signal will have precedence over the Start Button. See the Program Menu section for instructions on how to enable or disable the Autostart feature.
Pump Running Hours Button Press and hold the Pump Running Hours Button to display the amount of time that the pump has been enabled. The running hours will be shown in the process display window. Display of running hours is in units of hundreds so a display value of 10 would mean 1,000 hours. The running hours will be displayed for as long as the button is held. The hours will be displayed for as long as the button is held. Control is not disturbed while the hours are being displayed.
Down Button The Down Arrow button decreases the setpoint temperature. Pressing the Down Arrow and releasing it decreases the setpoint temperature by one degree. Pressing the Down Arrow button and holding it decreases the setpoint temperature until reaching the minimum allowable setpoint temperature. In addition to adjusting the setpoint temperature, the Down Arrow button adjusts various alarms and setpoint values when the unit is in the programming mode.
is fully loaded by the heat from the process. If the Partial Load LED stays on, the chiller has a very small load on it from the process. If this low load condition persists, the To Process temperature may begin to drop below the Setpoint temperature, eventually cycling off compressor(s). Compressor 1 LED The Compressor 1 LED is solid green while Compressor #1 is running. It will flash red if a compressor overload condition exists (only chillers with the following nominal tonnages: 15, 25, 30, 35, 40).
Electrical Phase Error LED The Electrical Phase Error LED flashes red when a line voltage problem exists. This error indicates a loss of phase, phase reversal, or phase imbalance. Low Flow LED The No Flow LED will be illuminated if the flow through the chiller is below the preset acceptable level. When the Start button is depressed, this safety is defeated for a period of 5 seconds in order for the pump to establish flow. This safety will shut off the pump and the compressor.
Low Refrigerant Pressure LED If the compressor suction pressure drops below the setting on the low refrigerant pressure safety, the compressor will shut off, the pump will remain running, and the Low Refrigerant Pressure LED will be illuminated. Pressing the Alarm Reset button will reset the Low Refrigerant Pressure fault, as long as the refrigerant pressure has risen back up above the safety's cutout level. Program Mode LED The Program Mode LED will flash yellow while in the programming menu.
the Setpoint display until the correct password value is shown. To enter the password, press and release the Start button. If the password is entered incorrectly, there will be a “no” on the Setpoint display and "PAS" on the Actual display. After 5 seconds, the unit will go back to the password entry mode and display “PAS” on the Actual display and "blanks" on the Setpoint display. If no activity occurs for another 5 seconds, the controller exits the programming mode and returns to the Stopped state.
Table 4 - Controller Program Menu Item Name Alarm Delay ‐ High Deviation Alarm Delay ‐ Low Deviation Autostart Enabled Brownout Enabled Comm Baud Rate Comm Modbus ID Comm SPI Address Communications Type Compressor 1 Negative Spread Compressor 1 Positive Spread Compressor 2 Enabled Compressor 2 Negative Spread Compressor 2 Positive Spread Derivative Display Units Freezestat Limit High Deviation Alarm Limit Integral Low Deviation Alarm Limit Proportional Band Remote Setpoint High Limit Remote Setpoint Low Lim
Table 5 – Controller Control Fault Logic Fault Low Reservoir Level Temperature Limit Safety Temperature Limit Warning Pump Motor Overload Compressor Motor Overload High Refrigerant Pressure Low Refrigerant Pressure Low Evaporator Temperature Supply Probe Fault Hi Alarm Indication The Reservoir Level Light flashes red The Setpoint and Actual Temperatures Flash and the Temperature Limit Light flashes red The Temperature Limit Light flashes yellow The Pump Light flashes red The Compressor Light flashes red T
Table 6 – ModBus Option Parameters (Integer Values) Reg 4000 4001 Description CONTROLLER BOARD TYPE SOFTWARE VERSION 4002 MACHINE STATE 4003 4004 4005 4006 4007 4008 4009 4010 4011 4012 4013 4014 4015 4016 4017 4018 4019 4020 4021 4022 4023 4024 4025 4026 4027 4028 4029 4030 4031 INPUT TYPE 0 INPUT TYPE 1 INPUT TYPE 2 INPUT TYPE 3 DERIVATIVE INTEGRAL HEAT CYCLE RATE COOL CYCLE RATE LOW ALARM DELAY HI ALARM DELAY DISPLAY UNITS CONTROLLER TYPE BROWNOUT ENABLED AUTOTUNE ENABLED SEAL SAVER ENABLED REM HEAT
Table 7 – ModBus Option Parameters (Floating Point Values) Reg Description Read/Write Notes 8000 FREEZESTAT TEMPERATURE READING (°C) R Error Hi = 9.9E05, Error Low = ‐9.9E05 8002 SUPPLY WATER TEMPERATURE (°C) R Error Hi = 9.9E05, Error Low = ‐9.9E05 8004 RETURN WATER TEMPERATURE (°C) R Error Hi = 9.9E05, Error Low = ‐9.9E05 8006 N/A R Error Hi = 9.9E05, Error Low = ‐9.
Figure 7 – ModBus Option Parameters (Floating Point Values) ‐ continued Reg Description Read/Write 8080 REM SETPOINT LOW (°C) R 8082 REM SETPOINT HI (°C) R 8084 ZERO CAL LINEAR CHAN 0 R 8086 ZERO CAL LINEAR CHAN 1 R 8088 ZERO CAL LINEAR CHAN 2 R 8090 ZERO CAL LINEAR CHAN 3 R 8092 SPAN CAL LINEAR CHAN 0 R 8094 SPAN CAL LINEAR CHAN 1 R 8096 SPAN CAL LINEAR CHAN 2 R 8098 SPAN CAL LINEAR CHAN 3 R 8100 CJC ZERO CAL R 8102 TC SPAN CAL CHAN 0 R 8104 TC SPAN CAL CHAN 1 R 8106 TC SPAN CAL CHAN 2 R 8108 TC SPAN CAL C
PLC Controller Navigation Start‐Up Screen & Conair Contact Information This is the first screen to be displayed after the chiller’s control circuit is turned on. One may also reach this screen from the Active Alarms Screen / Alarm History by pressing the “Contact Info” button. 1 1. Go to Main Screen: press anywhere on the display once. Main Screen On this screen, the user has On/Off control of the chiller. The user may change the temperature setpoints of the chiller.
1. Local/ Remote Start Mode (Press to Toggle) a. If “Local” is shown: Chiller is started and stopped from this touch screen. b. If “Remote” is shown: Chiller is started and stopped by remote contacts. 2. Chiller Start ‐ Pressing this button will start the chiller if “Local Control” is ON. a. If “Start” is shown: Chiller is OFF b. If “Running” is shown: Chiller is ON 3. Chiller Stop ‐ Pressing this button will stop the chiller if “Local Control” is ON. a. If “Stopped” is shown: Chiller is OFF b.
Refrigeration Diagnostic Screen On this screen, the user can see information that will help identify and troubleshoot refrigeration system issues. 1 8 2 7 6 4 5 3 1. Go to Active Alarms Screen / Alarm History screen: a. This will appear blank if no alarms or warnings are active. This box will be flashing if a warning or alarm is active. b. Press this button to be taken to the Active Alarms Screen / Alarm History. 2. Hot Gas Bypass Output Percentage a.
6. Go to Process Diagnostic Screen: This screen displays status of the chiller’s programmable controller. 7. Compressor ON/OFF Status & Running Hours: Shows the status and running hours of the compressor(s). 8. Setpoint and Supply Temperature: The Supply temperature is roughly the same temperature as the water leaving the evaporator. Process Diagnostic Screen 1 3 7 6 2 5 4 1. Supply and Return Water Temperature Display a. The temperature sensor for water supplied to the process is always displayed.
a. This is the control signal being sent to the Hot Gas Bypass Valve. Percentage corresponds to percent open. There is some lag in valve response, so it will not correspond to the exact valve location at all times. b. This is a heating function and it will open to prevent the Supply Temperature from dropping below the Setpoint. c. It is normal for the valve to be open at some percentage at almost all times. This chiller is designed with excess cooling capacity, and this valve balances that excess capacity.
6 3 7 8 1. Alarms & Troubleshooting Tips: Press the alarm for which you want to see Troubleshooting Information. Then press the Troubleshooting Tips button to bring up the information. 2. Alarm Reset: Press this button to reset any active alarm or warning conditions. An Alarm/Warning indication will be shown again if Reset is pressed but the issue has not been resolved. 3. Go to Main Screen: takes you back to the Main Screen. 4.
Output Status / Output Designation The Output Status Screen shows whether digital outputs from the chiller’s programmable controller are ON or OFF. “0” represents OFF while “1” represents ON. Each symbol (Y0, Y1 etc) represents a physical output that is labeled both on the controller and the chiller’s electrical schematic. Output Status 1 2 3 Output Designation Back to Output Status 1. Go to Output Designation Screen: Show what devices are wired to each output.
Setup Screens (Password is “000”) Compressor Setup Adjust the cut in and cut out points for the refrigeration compressor(s). Cut in and Cut Out values are relative to Setpoint. Temperature Alarm Settings Adjust the temperature alarm points. “Hi” and “Lo” designate Warning points. The system will show an amber flash if one of these points is reached, but the unit will not shut down. “HiHi and LoLo” are Critical Alarm Points. The chiller will shut down if one of these points is reached.
Components Chilled Water Return Temperature Sensor The temperature sensor is in the return fluid piping and senses the temperature of the chilled water entering the evaporator. The chilled water in temperature is on the HMI screen. This probe is directly in the fluid stream, there is not a sensor well included. Chilled Water Supply Temperature Sensor This temperature sensor is in the chiller reservoir and it transmits the chilled water supply temperature to the PLC.
Condenser Remote Air‐Cooled (EP2R Models Only) The remote air‐cooled condenser has a copper tube and aluminum fin coil with multiple fans. The refrigerant passes through the copper tubes, while the air passes over the fins. The condenser supplied is equipped to vary the header fan(s) speed and operate the remaining fans as needed to control the refrigerant discharge pressure under varying ambient and chiller loading conditions.
Coolant Flow Switch This switch is located in the piping directly before the evaporator inlet. It shuts the unit down if there is insufficient coolant flow through the evaporator. The switch is not adjustable. If the chiller shuts down due to low coolant flow, restart using the HMI on the control panel. Crankcase Heater The compressor crankcase heater prevents too high of refrigerant concentration in the oil during shut down.
Human Machine Interface (HMI) The human machine interface (HMI) provides a user interface with the PLC, which controls the operation of the chiller. The HMI allows data entry for chiller setup, accepts commands to operate chiller, and displays chiller status. Pressure Relief Valve A pressure relief valve is installed on all pressure vessels to safely relieve pressure due to fire or other abnormal operating conditions.
Note: Occasional bubbling in a sight glass may occur at a time when load conditions are changing and the expansion valve is adjusting to the new conditions. This momentary occurrence is a result of normal chiller operation. Another use for the sight glass is check if there is moisture in the refrigeration circuit. Y‐Strainer A Y‐Strainer with a 20‐mesh screen is in the entering chilled water line to help protect the evaporator passages from clogging.
Preventive Maintenance Once your portable chiller has been placed into service, the following maintenance procedures should be adhered to as closely as possible. The importance of a properly established preventive maintenance program cannot be overemphasized. Taking the time to follow these simple procedures will result in substantially reduced downtime, reduced repair costs, and an extended useful lifetime for the chiller.
Once a Month 1. With the main disconnect shut off and locked out, check the condition of electrical connections at all contactors, starters and controls. Check for loose or frayed wires. 2. Check the incoming voltage to make sure it is within 10% of the design voltage for the chiller. 3. Check the amp draws to each leg of the compressor (fans or blowers on air‐cooled units) and pump to confirm that they are drawing the proper current. Every Three Months 1.
Preventive Maintenance Checklist Maintenance Activity Week Number 1 2 3 4 5 6 7 8 Date Clean Condenser Coil and Inlet Filter (air cooled units) Temperature Control Pump Discharge Pressure Coolant Level Glycol Concentration Pump Seal Refrigerant Sight Glass Electrical Connections Incoming Voltage Compressor #1 L1 Amps Compressor #1 L2 Amps Compressor #1 L3 Amps Compressor #2 L1 Amps Compressor #2 L2 Amps Compressor #2 L3 Amps Pump L1 Amps Pump L2 Amps Pump L3 Amps Fan #1 L1 Amps Fan #1 L1 Amps Fan #
Troubleshooting Problem Compressor will not start Pump will not start Low refrigerant pressure High refrigerant pressure Possible Cause Compressor overload Compressor contactor Compressor failure Pump overload Pump contactor Pump failure Low refrigerant charge Refrigerant leak Low refrigeration pressure sensor Dirty air filters (air‐cooled units only) Air flow obstruction (air‐cooled units only) High ambient air temperature (air‐cooled units only) Condenser fan motor (air‐cooled units only) Condenser fa
Problem Erratic temperature control Insufficient cooling (temperature continues to rise above setpoint) Possible Cause Low coolant flow through evaporator Intermittent overloading of chiller capacity Hot gas bypass valve Temperature sensor Process load too high Coolant flow through evaporator too high or low Insufficient condenser cooling Hot gas bypass valve stuck open Refrigeration circuit problem Temperature sensor Solution Adjust flow to proper level Check to make sure chiller is properly sized for p
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Equipment Guarantee Conair guarantees the machinery and equipment on this order, for a period as defined in the quotation from date of shipment, against defects in material and workmanship under the normal use and service for which it was recommended (except for parts that are typically replaced after normal usage, such as filters, liner plates, etc.). Conair’s guarantee is limited to replacing, at our option, the part or parts determined by us to be defective after examination.
