Ducted Split Wine Cellar Cooling Systems Installation, Operation and Maintenance Guide WGS40, WGS75, WGS100, WGS175 Manufactured by: www.wineguardian.com Syracuse, NY www.airinnovations.com Wine Guardian reserves the right, without notice, to make changes to this document at its sole discretion. Please visit our web site for the most current version of the Wine Guardian manual and other literature. Wine Guardian is a registered trademark (2,972,262) of Air Innovations, Inc.
Table of Contents Directory of Terms ...........................................................................................................4 Illustrations .......................................................................................................................5 Receiving, Inspecting and Unpacking the Wine Guardian Unit ........................................9 Review the Packing Slip to Verify ..........................................................................................
Planning the Installation .................................................................................................29 Addressing Items in the Planning Process ............................................................................. 29 Performing a Pre-installation Check ....................................................................................... 29 Installing the Fan Coil Unit .............................................................................................
Testing the Fan .................................................................................................................................. 61 Running the Unit ................................................................................................................... 62 Cycling the Unit ...................................................................................................................... 62 Setting the Remote Interface Controller ...............................................
Directory of Terms Ambient Air – The surrounding area outside the wine cellar such as a room, basement, garage or outdoors. BTU/H – British thermal units/hour. A unit of measurement to describe the power of heating and cooling system. CFM – Cubic feet per minute. A unit of measurement for the amount of air handled by the fan. Condensate / Condensation – The water formed out of the air when it is cooled below a certain temperature (called dew point).
Illustrations Overview of the Wine Guardian fan coil .............................................................. 13 Refrigeration Illustration of the Wine Guardian fan coil ....................................... 13 Ducted split system specifications sheet ............................................................. 14 Wiring diagram for WGS40 ................................................................................. 15 Wiring diagram for WGS75 ....................................................
Receiving, Inspecting and Unpacking the Wine Guardian Unit NOTE: Wine Guardian units are factory assembled and tested prior to shipment. The Wine Guardian Ducted Split System consists of two separate components, the Wine Guardian fan coil and condensing unit. These ship from separate manufacturing facilities and therefore may not arrive on the same date and time. Each Wine Guardian component is shipped in a corrugated box. A shipment may include one or more boxes containing accessories.
General Description View Fig. 1 and Fig. 2 on page 13 for details IMPORTANT Design and specifications are subject to change without notice The Wine Guardian cooling unit is a professional grade, American-manufactured, split two-piece climate control unit designed specifically for the storage of wine at cellar temperatures. It is designed for easy installation and operation. Wine Guardian uses digital electronic controls and R-134a refrigerant.
Wine Guardian Fan Coil Unit The Wine Guardian fan coil unit meets its rated capacities for total BTU/H and CFM at design cellar conditions and external static pressures. The fan coil unit is capable of rated CFM against the static pressure imposed by recommended ductwork. The fan is a motorized impeller type, statically and dynamically balanced, and uses permanently lubricated direct drive motors requiring no maintenance.
IMPORTANT The air exhaust from the condensing unit is hot and will be 15 to 20 degrees C above the entering temperature. The condensing units are rated for a maximum temperature of 46 degrees C. The condensing units should be installed in a well-ventilated area to ensure proper air flow across the condenser coil and to limit short cycling. Accessories and Optional Equipment Heating Coils An optional heating coil is built in and requires no additional power source.
Overview of the Wine Guardian fan coil Fig. 1 Fig.
Fig. 3 Model Number WGS40 WGS75 WGS100 WGS175 Dimensions - Nominal A – Width B – Height C – Length D – Evap. Discharge (OD) DI – Evap. Inlet (OD) E – Outlet opening width F - Outlet opening height G – Drain outlet location AA – Discharge opening height BB – Discharge opening width CC – Inlet opening height DD – Inlet opening width EE – Suction Line (OD) FF – Discharge Line (OD) Weight cm cm cm cm cm cm cm cm cm cm cm cm cm cm Lbs. 35.6 35.9 42.5 20.2 20.2 25.3 28.3 1.7 19.1 17.8 17.9 17.8 1.0 0.
Wiring Diagram for WGS40 Fig.
Wiring Diagram for WGS75 Units Fig.
Wiring Diagram for WGS100, WGS175 Units Fig.
24-Volt Contactor Detail Sheet 24 Fig.
Condensing Section Wiring Schematic for WGS040 19
Condensing Section Wiring Schematic for WGS75 20
Condensing Section Wiring Schematic for WGS100 21
Condensing Section Wiring Schematic for WGS175 22
Safety IMPORTANT The equipment described in this manual uses electricity. When using this equipment, be sure to follow the safety procedures outlined in this manual. Safety Message Conventions Safety messages contained in this manual, DANGER, WARNING, and CAUTION are bold and highlighted in red for quick identification. Danger A Danger message indicates an imminently hazardous situation which, if not avoided, results in death or serious injury.
Following is a typical example of a Caution message as it could appear in the manual: CAUTION RISK OF PERSONAL INJURY OR DAMAGE TO EQUIPMENT Improper installation may result in the equipment malfunctioning and a safety hazard. Read all of the installation instructions before installing the Wine Guardian unit. Lockout/Tagout Procedure 1) Turn off the power switch (indicator light should be off) 2) Unplug the unit from the electrical outlet and cover the outlet to prevent accidently plugging in the unit.
Electrical Shock Hazards All power must be disconnected prior to installation and servicing this equipment. More than one source of power may be present. Disconnect all power sources to avoid electrocution or shock injuries. Hot Parts Hazards Electric resistance heating elements must be disconnected prior to servicing. Electric heaters may start automatically. Disconnect all power and control circuits prior to servicing the unit to avoid burns.
WARNING Check weights to be sure that the rigging equipment can support and move the Wine Guardian unit safely. Note any specific rigging and installation instructions located in the Installation section of this manual. All supports for the unit must be capable of safely supporting the equipment’s weight and any additional live or dead loads encountered. All supports for the unit must be designed to meet applicable local codes and ordinances.
Installation CAUTION SHARP EDGES RISK OF SERIOUS INJURY Sharp edges are present inside the Wine Guardian system. SHARP EDGES RISK OF SERIOUS INJURY Sharp edges are present inside the Wine Guardian system. Pre-installation Test Test the system before installing it to check for non-visible shipping damage. To test the system: Set the system on the floor or a sturdy level surface. , Plug in the system. Press the on/off switch, control illuminates. This indicates the system has power.
Air Flow Diagram Fig. 1 WARNING RISK OF PERSONAL INJURY OR DAMAGE TO EQUIPMENT Modification to the equipment may cause injury or damage to the equipment. DANGER This equipment is heavy. Place the unit on the floor or on a level and stable surface that can support the full weight of the unit. Do not modify the equipment. Modifications may cause damage to the equipment and will void the warranty. Never place anything on top of the unit.
Planning the Installation IMPORTANT Installation of residential and commercial split systems must be performed by qualified service technicians with proper training in the installation, start up, service, and repair of these systems. Certification to handle refrigerants is also required.
Installing the Fan Coil Unit Wine Guardian fan coil units are typically installed indoors located near the cellar to minimize the duct runs. Each unit is provided with one entering or return air inlet and five possible supply air outlets. A maximum cumulative total length of flexible ductwork, for both supply and return ducts (including bends) of 8 meters is recommended.
Ceiling Mounting Construct a structurally sound, level platform to place the unit on when hanging it from the ceiling joists. The Wine Guardian is NOT designed to be suspended from the top of the unit; it must be supported from the bottom. Angle brackets are available as an option for these types of applications. Place the unit on a platform to ensure that the unit is supported on all four corners. Leave adequate space on the top of the unit to remove the access doors for service.
Rod Mount Fig.2 Shelf Mount Fig. 3 Optional ductwork connection on same wall Fig.
Installing the Ductwork and Grilles Duct Collars One inlet duct collar and one evaporator outlet are supplied with each fan coil unit as standard equipment from the factory. The duct collars are removable. The return air, or inlet duct collar must connect to the return air outlet from the wine cellar. Any of the five supply air outlets on the unit can be used for the ductwork to the supply grille(s) inside the wine cellar.
Do not locate the supply air grille where it blows directly on the remote interface controller. General Duct Recommendation Support the flexible duct often to prevent sags or bends. Stretch the duct to make for a smoother interior for less air resistance. For a 90 degree bend, insert a metal elbow inside the flexible duct to avoid crimping. Do not squeeze or reduce the inside diameter of the ducts. This restricts the airflow. Use short and straight ductwork.
Installing the Condensate Drain Connection The Wine Guardian unit provides dehumidification for the inside of the wine cellar. It cools the air down to the dew point corresponding to the temperature setpoint of the remote interface controller. If the vapor barrier of the wine cellar is poorly constructed or excess moisture is in the basement, the unit may remove excessive amounts of moisture from the wine cellar. The moisture appears in the condensate drain of the unit.
Wiring the Fan Coil Unit for Power DANGER ELECTRICAL SHOCK HAZARD RISK OF SERIOUS INJURY OR DEATH The electrical outlet and wiring installation must meet the national and local building codes. DO: Match the electrical outlet to the plug provided on the Wine Guardian. Provide dedicated circuit and wiring for the system. Match the wiring and breaker size to the rated load as shown on the serial plate and in this guide.
Installing the Condensing Unit Condensing units are factory assembled with a sheet metal outdoor hood for protection from the elements. A minimum of 30cm is required around the perimeter of the condensing unit for proper airflow across the coil, and to provide an adequate discharge airflow path through the louver section. Any obstructions to this airflow will result in a decrease in performance, and possibly premature failure due to a buildup of high pressure within the system.
When sweat connections are made in the connecting lines, be sure that the inside of the tubing is clean before installing the unit. Use a dry nitrogen bleed during brazing. Note that compressor suction and discharge valves should be open to atmosphere no longer than 15 minutes. Compressors with POE (polyolester) oil will quickly become contaminated when opened to atmosphere. On any installation, the use of a suction line filter, liquid line filter drier and moisture indicator is recommended.
Sample Piping Configurations Incorrect Installation Evaporator Correct Installation Evaporator Condenser Condenser Creates an oil trap Evaporator Condenser Evaporator Condenser Creates an oil trap Oil runs away from condenser Condenser Condenser Evaporator Evaporator Condenser Evaporator 39 Soft copper sages and creates an oil trap Condenser Evaporator
Leak Checking and Evacuation Process WARNING ALL COMPONENTS CHARGED WITH DRY AIR MUST BE EVACUATED BEFORE CHARGING WITH REFRIGERANT Purge the dry air charge from the unit by opening the liquid line shut-off valve or removing the liquid line outlet fitting or plug, whichever is applicable for your particular unit. Connect the suction and liquid lines to the unit.
Wiring Wire the system as per the supplied wiring schematic found on pages 18 through 20 of this manual. The fan coil unit is powered through a factory-supplied power cord, but you will need to run 24 volt power wires from the two position terminal block to the field installed enclosed contactor (in plastic housing) to be placed in the condensing unit, or to somewhere adjacent that is easily accessible. This can be typical remote interface controller wire or 18 gauge insulated wire. (see Fig.
Determining the amount of charge – When “refrigerant side” head pressure control is utilized on a system, one of the most important factors is determining the total system refrigerant charge. While on most packaged units the amount of charge is listed on the unit, the required charge for a field built-up system cannot be listed by the manufacturer. Charge is usually added when the system is started up until “proper” system performance is reached.
Charging of Systems with Sporlan Head Pressure Control in ambient below 20 degrees C (After normal evacuation procedures): NOTE: When charging in ambient below 20 Deg. C the procedure is very critical. Be sure to adhere to the following steps. Failure to do so will result in overcharging the system. 1. Follow instructions 1 through 7 above. 2.
If you are not sure how to measure superheat or sub-cooling: Superheat Get an accurate suction line temperature on the suction line as close to the compressor inlet as possible. At same time, attach a compound pressure gauge set to the system so as to read the low side suction pressure at the suction service valve port (back seated valve stem to allow un-restricted refrigerant flow from evaporator back to the compressor).
Split System Operations Chart WGS40 OD Ambient (F) 10 40 60 70 80 100 115 Suction (kPa) 145 173 214 214 221 234 241 Discharge (kPa) 593 703 724 731 827 1130 1365 Superheat C) Sub-cooling (C) -16 -9 -13 16 -13 4 -11 -4 -8 -6 -4 -3 -2 2 Suction (kPa) 165 179 193 186 186 186 193 Discharge (kPa) 593 703 751 786 923 1234 1482 Superheat (F) Sub-cooling (F) -15 7 -15 -8 -15 -8 -12 -6 -11 -4 -6 -1 -3 -1 Suction (kPa) 151 159 173 186 193 206 228 Discharge (kPa) 676 655 744 896 606 1331 1586 Superheat (F) S
Installing the Thermostat and Communication Cable The Wine Guardian Remote Interface Controller is a combination temperature and humidity controller with single stage cooling, heating and humidifier control. Each Wine Guardian unit is supplied with a Remote Interface Controller and 50 feet of communication cable. It is wired at the factory for testing prior to shipment. In most applications the Remote Interface Controller will be mounted within the wine cellar.
Mounting the Remote Interface Controller 1. Disconnect the communication cable from the side of the Wine Guardian unit and the Remote Interface Controller. a) Install the communication cable within the wall and/or ceiling structure of the wine cellar to the desired controller mounting location. Fig. 1 b) Mount the remote interface controller on a solid surface away from doors, corners, air outlets, drafts or heat generating equipment.
. 4. Plug in the communication cable to the back of the Remote Interface Controller backing plate. (Fig.4) a) Attach backing plate to wall using the two screws provided with the system. (Fig.5) Fig. 4 Fig. 4 5. Re-install plastic face plate on to backing plate. 6. Re-attach the communication cable to the side of the Wine Guardian cooling unit. (Fig.6) Fig. 5 Fig.
Installation of the Wine Guardian Remote Sensor The Remote Sensor is a combination temperature and humidity sensor only. It is designed to be mounted within the wine cellar and can be used in combination with the Remote Interface Controller or up to three additional Remote Sensors to read and control multiple areas within the wine cellar. Mounting the remote sensor Disconnect the communication cable from the side of the Wine Guardian unit and the remote sensor.
1. Mount the Remote Sensor on a solid surface away from doors, corners, air outlets, drafts or heat generating equipment. Do not mount the Remote Sensor directly on an outside wall or wall adjacent to a boiler room. Use a piece of foam insulation behind the sensor to insulate it from a hot or cold surface. The recommended height is 1.2 to 1.5 meters above the finished floor. 。 Fig. 2 2.
If using multiple Remote Sensors in one wine room continue to mount the remaining sensors before installation of the sensor cover plates. When multiple sensors are used the sensor jumper position must be adjusted in order for proper averaging of temperature and humidity readings. See page 27 for jumper set up. Joining Communication Cable Important Wine Guardian cooling systems are supplied with 15 meters of 6 wire, Cat 3 twisted pair communication cable with RJ11 type connectors.
Changing Jumper Positions (Averaging reading from Remote Sensor) If using multiple Remote Temperature/Humidity sensors in your application, refer to the photos showing the need to change the jumper locations internal to the control board on each remote sensor (up to 3 maximum). For the control to average all of the sensors utilized (if more than one), the jumper must be in different positions on the pins. Jumper Position 2 As you can see, there are three pin settings. To access the jumper: 1.
STANDARD CONTROLLER FUNCTIONS Humidity Temperature Up Button Down Button “Heat” symbol Settings button (right side) Settings Area On/Off (left side) “Cool” symbol How to: Turn system on/off Press the On/Off” button once. Note: There is a five (5) second time delay before the system turns on or turns off. Change Temperature Press the “Up” arrow once. The display will show the existing temperature set point. Press the up or down arrow buttons to adjust the temperature to the desired set point.
Settings – Press and hold the “Settings” button for five (5) seconds to access the following settings. Deg F or Deg C Setting 1 Press the “Down” arrow to change temperature from Deg F to Deg C. Press the “Up” arrow to change temperature from Deg C to Deg F. Low temperature alarm set point Setting 2 Press “Settings” button to advance to Setting 2. Press the “Up” or “Down” arrow buttons to adjust to the desired set point. Factory default is 10 Deg. C.
Add or remove humidifier Setting 6 Press “Settings” button to advance to Setting 6. Press the up or down arrow buttons to adjust to the desired set point. Factory default is zero (0) Fan AUTO or ON One (1) = Integral Wine Guardian mounted humidifier 一 Two (2) = Stand-alone remote mounted humidifier Setting 7 Press “Settings” button to advance to Setting 7. Press the “Up” or “Down” arrow buttons to adjust number to the desired set point. Factory default is zero (0).
Advanced Settings-Advanced Settings Special access required. Contact Wine Guardian Service Department for access code Compressor anti-short cycling time Setting 8 Press “Settings” button to advance to Setting 8. Press the up or down arrow buttons to adjust number to the access code. Press “Mode” button to continue onto setting 9 through 19. Setting 9 Press “Settings” button to advance to Setting 9. Press the “Up” or “Down” arrow buttons to adjust to the desired time in one (1) minute increments.
Room sensor calibration Setting 15 Press “Settings” button to advance to Setting 15. Press the “Up” or “Down” buttons to adjust to the desired set point. Maximum setting is +2°C, minimum setting is -2°C. Factory default is zero (0). Sensor calibration set point changes the actual display reading (temperature only) by the value of this setting.
Alarm Codes High temperature alarm (!) Flashing temperature number Press the “Up” or “Down” arrow once to change screen from alarm to normal Temperature and Humidity indication. “Flashing temperature number” Along with flashing (!) symbol will remain on screen until temperature falls below the High Temperature Alarm set point (Setting 3). Low temperature alarm Flashing temperature number Press the “Up” or “Down” arrow once to change screen from alarm to normal Temperature and Humidity indication.
!2 = CS (Condensate Switch Fault) Press the “Up” or “Down” arrow once to change screen from alarm to normal Temperature and Humidity indication. THIS ALARM FORCES THE SYSTEM TO SHUT DOWN. The “!2” will remain on screen until the CS (condensate switch) fault is resolved and reset.
Inspection and Start-up Checklists Unit received Unit received complete as ordered including accessories Handling and Installing Unit mounted on solid level surface Sufficient space allowed for access to unit and accessories Proper electrical service provided Hot water provided to humidifier Drain lines and trap installed properly Ductwork, fittings and grilles installed properly All cold duct surfaces insulated Low ambient control included if freezing condition present No obstructions
Starting-up and Operating the Wine Guardian Split System Now that the installation is complete, it’s time to start the unit up. Check to make sure all ductwork and electrical connections are secure. Replace all panels which were removed during installation. Check that all of the openings in the unit are covered with a blank panel, a ductwork connection or a grille. CAUTION Rick of personal injury. Cover all openings of the unit to prevent a hand or finger from access inside the unit.
Running the Unit Check unit to confirm the compressor is running, such as the hum of the compressor or cool air leaving the unit. √ . Initially, the unit may run continuously for several hours, up to a day or more, while it lowers the cellar temperature. Once the unit reaches the set point temperature, it shuts off and starts to cycle on and off as it continues to lower the bottle temperature to the set point. The cellar air reaches set point before the bottles.
NOTE: To monitor the Cellar Temperature, place thermometers in various locations in the cellar to monitor the temperature zones. Change the temperature in various zones by shifting the air flow patterns. Changing the Air Flow Direction The grilles furnished with Wine Guardian are single directional. Rotate the grilles to change the direction of the air flow. When using multiple supply ductwork balance the air flow between the ductwork.
。 Maintenance General WARNING 警告 BEFORE PERFORMING MAINTENANCE ON THE UNIT, READ AND UNDERSTAND THE SAFETY INFORMATION CONTAINED WITHIN THE SAFETY CHAPTER OF THE WINE GUARDIAN MANUAL. DANGER HIGH VOLTAGE - RISK OF SERIOUS INJURY OR DEATH High voltages are present in the cabinets. Turn off all power. Use the Lockout/ Tagout procedure before opening panels. CAUTION SHARP EDGES RISK OF SEROUS INJURY Sharp edges are present on the fan wheels, housing, fins and coils.
Cleaning the Filters The evaporator and condenser coils are provided with reusable, washable air filters. The filters protect the coils from becoming coated or plugged by dust. Frequency of cleaning the filters is based on the amount of dust or dirt generated in the cellar or basement. 。 1. 2. 3. 4. 5. Remove the grille or duct collar on the inlet end of the unit. Remove the filter covering the face the coil. Wash it under warm water. Shake off excess water. Inspect and clean the face of the coil.
Cleaning the Condensate Drain System The condensate drain system traps dust and dirt. Clean the drain system once a year. 1. Shut off the rocker switch and unplug the unit. Remove the grille or duct on the evaporator inlet. Remove the filter and inspect the drain pan under the coil. 2. If drain pan appears soiled, pour some hot water mixed with liquid bleach (diluted solution) along the length of the pan to flush the dirt down the drain tube.
Maintenance Schedule Monthly (or quarterly depending on experience with individual cellar) Check filter and drain trap – clean if needed. Check for noise or vibration. Check for short-cycling of the unit – a turning on and off of the compressor unit more than either (8) times/hour. Yearly (in addition to monthly) Replace filters if worn or plugged beyond cleaning. Check evaporator and condenser coils for dirt – use a vacuum with a brush attachment to clean the coils.
Troubleshooting WARNING BEFORE PROCEEDING, READ AND UNDERSTAND THE SAFETY INFORMATION CONTAINED IN THE SAFETY SECTION OF THE WINE GUARDIAN MANUAL. IMPORTANT This section is intended as a diagnostic aid only. For detailed repair or parts replacement procedures, contact a qualified service company. Check the following table for some solutions before calling a service technician.
No power to thermostat Check wiring for loose broken or frayed connections Check transformer for 24v output Power Switch Light is On and the Thermostat Light is On Possible Cause Thermostat is not set up properly Solution Check thermostat set up in the guide. Press fan ON switch to check evaporator fan only.
Cellar Temperature too cold (below 11°C) when unit is running Possible Cause Solution Thermostat set too low on cooling Reset thermostat to higher cooling temperature Heating coil (optional) not operating Check for temperature rise across coil Thermostat set too low on heating Reset thermostat to higher heating temperature Thermostat not controlling temperature Wiring integrity compromised (shorted), replace wiring Cellar Temperature is too cold (below 11°C) when unit is not running Possible Cause
Humidity too low with optional humidifier Possible Cause Solution Humidifier not operating Check wiring for loose, broken or frayed connections Check humidistat set up Check for water flow & solenoid valve operation Check damper operation Humidifier operating Check for water being hot Check drip pad – replace if scaled No vapor barrier around cellar Humidity too high when unit is running but not cooling Possible Cause Compressor not operating Solution Check and reset high limit switch Clear blockage
Other Miscellaneous Problems Unit operates but the power switch light is not ON Possible Cause Bulb is burned out Solution Replace bulb Unit is leaking water Possible Cause Solution Trap plugged Clean trap Condensate pan plugged Remove blockage and clean Unit not level Level with shims Unit is running properly, but the sound of the unit is objectionable Possible Cause Noise is from airflow Solution Redirect airflow Add baffles Add insulated ductwork Noise is from unit Add sound baffle between un
Instructions to Reset High Pressure Switch Remove the access panel, grille or duct collar at the condenser opening labeled “High Press. Manual Reset Switch ----- “Remove panel or grille to access” Locate the high pressure switch near the compressor (a cylindrical device piped into the refrigeration system with two wires a red button on the top). Push in the button until it locks into position. Push the rocker switch to restart the unit.
Advanced Troubleshooting IMPORTANT THIS SECTION IS INTENDED FOR QUALIFIED REFRIGERATION SERVICE TECHNICIANS ONLY. THE TECHNICIAN SHOULD REPEAT ALL OF THE PREVIOUS TROUBLESHOOTING STEPS BEFORE TAKING ACTION ON THESE MORE TECHNICAL SOLUTIONS.
High Pitched or Loud Rubbing Noise, Clanking or Vibration Possible Cause Fans loose or malfunctioning Excessive compressor vibration TXV malfunctioning Solution Repair or replace Replace Repair or replace Replacing the Blowers When replacing the fan or motor, replace the fan and motor as a unit. Do not remove the motor from the impeller wheel. Instructions to Reset High Pressure Switch 1. Remove the top and side access panels at the condensing unit 2.
Contact and Warranty Information Contact Information Wine Guardian 7000 Performance Drive North Syracuse, NY 13212 Service Department: press 3 Direct: (315) 452-7420 Service Department: ext. 7434 Normal business hours are 8 a.m. to 5 p.m. Eastern,USA Monday-Friday. After hours, contact: (315) 391-8747 Web site: www.airinnovations.com Email: info@airinnovations.
Warranty GENERAL Wine Guardian warrants, to the original buyer, its goods and all parts thereof to be free from defects in material and workmanship for a period of two (2) years from the date of invoicing assuming NORMAL USE AND SERVICE.。 LIABILITY Wine Guardian liability shall be limited to the repair or replacement (at its option) of any part, which, at our sole discretion, is determined to be defective. The purchaser shall pay all transportation costs.
