OPERATION MANUAL Electrical Valve Actuator Linear Valve Actuator www.powervalves.nl September, 2015 1nd,
INDEX Overview... 1 Important Notices... 2 Specification... 3 Motor Data... 5 Storage Information... 6 Lubrication... 6 Installation Procedures... 7 L250 / L500 Input Power 1φ 110V, 220V AC On-Off Controller... 10 L250 / L500 Input Power 24V AC On-Off Controller... 11 L250 / L500 Input Power 24V DC On-Off Controller... 12 L250 / L500 Input Power 1φ 110V, 220V AC Modulating Controller... 13 L250 / L500 Input Power 24V AC Modulating Controller... 14 L250 ~ L2000 Input Power 24V DC Modulating Controller... 15 L1000 / L2000 Input Power 1φ 110V, 220V AC On-Off Controller... 16 L1000 / L2000 Input Power 24V AC On-Off Controller... 17 L1000 / L2000 Input Power 24V DC On-Off Controller... 18 L1000 / L2000 Input Power 1φ 110V, 220V AC Modulating Controller 19 L1000 / L2000 Input Power 24V AC Modulating Controller... 20 Adjustment Modulating Control Board... 21 TROUBLE SHOOTING... 34 Warranty... 36 i
Overview Sun Yeh linear valve actuators provide with thrust from 250 to 2000 Kgs (551 ~ 4410 lbs). All models are equipped with modulating controllers and travel for globe valve (max. stroke 100 mm/3.94 inch), gate valve and linear travel device (max. stroke 100 mm/3.94 inch). It can be applied to HVAC and industrial use, especially for the steam and high temperature employments. Feature Self-locking drive system to hold in last position and prevent back driving up to thrust rating. Increased duty cycle by using DC motor provides high starting frequency. (1500 starts per hour.) External stem position indicator provides accurate valve positioning. Low-power consumption. NEMA 4X dry-powder coated aluminum alloy cover provides good weather resistance, water and dust-proof. Two-step over-thrust protection for modulating actuator. Manual operation can be applied in case of power failure. Built-in thermal protection prevents motor burning out. One-year warranty. 1
Important Notices! Operating by hand-wheel a. The actuators are supplied with the hand-wheel, note that under no circumstances should any additional lever device such as a wheel key or wrench be applied to hand-wheel in order to develop more force when closing or opening the valve. This may cause damage to the valve and/or actuator. b. Instruction for hand-wheel Press the hand wheel toward the actuator before using hand wheel. After users press the hand-wheel to operate manually, pull it out, so the linear actuator can be operated by means of power again. If users don t pull it out completely the linear actuator won t operate by power. a. Check for correct voltage prior to wiring. b. Turn power off before servicing or for maintenance purpose. c. Use sealant to seal conduit connections after wiring to prevent dusting or water contamination. d. The angle of electrical actuator installation must be between 0~180 degree. Do not install upside down or below the horizontal. e. Not intended for vacuum spaces and avoid installing near explosive atmospheres. f. Actuator should be placed at clean and dry place for storage, and protected with outer carton from being affected by great temperature difference or serious vibration. g. To avoid functional failure caused by statics, do not touch any components on the PCB with metal tools or bare hands. h. Please connect the ground wire to PE inside the electrical actuator. i. When more than one electrical actuator needs to be operated simultaneously, please connect with the individual cables or install extra relays. j. Running time and rest time should be based on the standard of 1500 stands per hour or the motor may overheat and stop running. k. The warranty period is one year. 2
Specification Standard Model Model L250 L500 L1000 L2000 Duty Cycle Power Supply Modulating,75% duty cycle 110/220V AC, 24V AC/DC Thrust kg(lb) 250(551) 500(1102) 1000(2204) 2000(4409) Motor Power ( W) 8 25 35 Mounting Flange (ISO5210) F07 F07 F10 F10 Adjustable Stroke Max. Stroke mm(inch) 50(1.97) 100(3.94) Stroke Timing mm/sec inch/sec 0.6 0.023 0.5 0.019 Connection mm(inch) Ø 12 (Ø 0.47) Ø 16 (Ø 0.63) Weight kg(lb) 8.5 (18.74) 27(59.52) Enclosure Material Ambient Temperature Range Temperature Humidity Conduit Entrance Manual Override Position Indicator Action on loss of input signal (Modulating Actuator only) Action on loss power Certified Enclosures Options Aluminum alloy casting (dry-powder coating) -30 ~+65 (-22 ~+149 ) 30% ~95% 1/2 NPT The external visual stem position indicator Fully open / fully close / hold in last place (preset) Stay in last place NEMA 4X, IP67 Model L250 L500 L1000 L2000 Space Heater Thermostat On/Off controller Slower Operating Time Potentiometer Unit (5K ohm) Conduit Entrance M20 3
Specification Outline Dimension B J C 2 - K E D G F M L A H I P 4 - Q N Unit mm inch Model A B C D E F G H I L250 L500 176.5 383.5 285.5 Ø 98 340 124 4 Ø55 Ø89 69.5 15.1 11.24 Ø3.86 13.39 4.88 0.16 Ø 2.17 Ø 3.5 J K L M N P Q Ø155 1/2 NPT 119 25 Ø 70 M12*1.75 M8*1.25 Ø 6.1 1/2 NPT 4.69 0.98 Ø 2.76 M12*1.75 M8*1.25 Model A B C D E F G H I L1000 L2000 254 537 391 Ø 194 543 205 4 Ø70 Ø125 10 21.14 15.39 Ø 7.64 21.38 8.07 0.16 Ø2.76 Ø4.92 J K L M N P Q Ø216 1/2 NPT 176 35 Ø 102 M20*2.5 M10*1.5 Ø8.5 1/2 NPT 6.93 1.38 Ø 4.02 M20*2.5 M10*1.5 4
Specification Mechanical Performance Model Thrust Weight Motor Power Mounting Flange Max. Stroke (W) ISO5210 kg lb kg lb mm inch L250 250 551 8.5 18.74 8 F07 50 1.97 L500 500 1102 8.5 18.74 8 F07 50 1.97 L1000 1000 2204 27 59.52 25 F10 100 3.94 L2000 2000 4409 27 59.52 35 F10 100 3.94 Motor Data 1φ 110V AC / 220VAC Model Stroke Timing 110V AC Current 220V AC Current mm/sec inch/sec Run (60Hz/50Hz) Lock Run (60Hz/50Hz) Lock L250 0.6 0.023 0.5A 0.5A 0.8A 0.4A 0.4A 0.5A L500 0.6 0.023 0.5A 0.5A 0.8A 0.4A 0.4A 0.5A L1000 0.5 0.019 0.5A 0.5A 0.7A 0.3A 0.3A 1.5A L2000 0.5 0.019 0.4A 0.4A 0.7A 0.3A 0.3A 1.5A 1φ 24V AC Model Stroke Timing Current mm/sec inch/sec Run (60Hz/50Hz) Lock L250 0.6 0.023 0.7A 0.6A 2.4A L500 0.6 0.023 0.8A 0.7A 2.4A L1000 0.5 0.019 0.9A 0.9A 13.4A L2000 0.5 0.019 0.9A 0.9A 15.7A 5
Motor Data 24V DC Model Stroke Timing Current mm/sec inch/sec Run Lock L250 0.6 0.023 0.3A 2.4A L500 0.6 0.023 0.4A 2.4A L1000 0.5 0.019 0.6A 13.4A L2000 0.5 0.019 0.6A 15.7A Note : Run: Full Load Ampere Lock : Locked Rotor Ampere Storage Information Receiving /Inspection Carefully inspect for shipping damage. Damage to the shipping carton is usually a good indication that it has received rough handing. Report all damage immediately to the freight carrier and your seller. Unpack the product and information packet taking care to save the shipping carton and any packing material should return be necessary. Verify that the items on the packing list or bill of lading agree with your own documentation. Storage If your actuator cannot be installed immediately, store it in a dry place, it must be protected from excess moisture, dust, and weather until you are ready to connect cables. If the actuator has to be installed but cannot be cabled, please don t remove the plastic transit cable entry plugs. When the actuator has to be cabled, it is recommended to replace the suitable water-proof plugs with IP protection. Lubrication The gear train has been permanently lubricated at the factory sufficiently. 6
Installation Procedures 1. Mounting the actuator! CAUTION a. Don t perform the stroke or thrust tests before mounting with the valve or without setting the thrust limit. b. Do NOT remove the spacer before completing the installing procedure. a. Before mounting actuator, verify that the thrust of the valve is less than the rated thrust of the actuator and check if the connecting nut of the output shaft fits to the stem of valve before inserting into actuator. b. Operate the valve to fully-closed position. c. Remove valve mechanical stops and mount with the proper connecting parts. Caution:Do not remove the nuts on the valve s stem. Caution: Whilst no international standard currently exists for linear flange interfaces, we conform dimensionally to ISO 5210 for the specific flange size. 0% Spacer Bracket Top connecting Nut Fixed Seat Valve s Nut Bottom Connecting Nut d. Manually operate the hand-wheel of the actuator to fully-closed position. Caution: Do not operate the stroke of the actuator under zero or 0%. 7
Installation Procedures e. Loosen the screws of Fixed Seat and rotate the bottom connecting nut into the valve s stem to the end. Caution: Do not rotate the top connecting nut during installation. f. Put the actuator onto the bracket and tighten 4 mounting screws g. Confirm the position of connecting nuts. Solution: Rotate the bottom connecting nut to CW direction until the bottom connecting nut touches the surface of upper connecting nut. Correct Wrong Caution: The length of bottom connecting nut's thread engagement must at least exceed the diameter of the valve stem. If not, please adjust the top connecting nut properly. h. Tighten the fixed seat. Caution: The required force to lock both sides should be the same. i. Tighten the valve s nut and the bottom connecting nut mutually. Fasten the lower connecting nut with Allen wrench and rotate the valve's nut. j. Assembling compled. 8
Installation Procedures 2. Cable Connections CAUTION! Ensure all power supplies are isolated before removing actuator cover and wiring. a. An internal grounding point (green) is provided. Please wire it. b. The cable entries can be tapped either 1/2 NPT (standard) or M20 (option) and will attach one black water-proof gland and one red plug. Caution: Make sure the cable entries fit to the cable type and size. c. Check if the supply voltage is the same as the actuator s nameplate. Refer to the wiring diagram for cable connection. Caution: Turn power off before wiring. d. Use sealant to seal conduit connections after wiring. Unused entries must be sealed with a suitable certified water-proof gland to prevent dusting or water contamination. Caution: The red plug in cable entry can be only used during transportation. Fit a suitable water-proof cable gland for long term protection. Ensure cover O-ring seal is in good condition before recovering. Wiring Diagram Abbreviation Illustration 1. NFB: No fuse breaker. 2. C.S.: Control switch 3. O.L.: Over-load relay. 4. H : Heater 5. LS1: limit switch for open. LS2: limit switch for close. LS3: limit switch for power failure (apply for manual override.) 9
Wiring Diagram L250 / L500 Input Power 1φ 110V, 220V AC On-Off Controller Input Power Actuator H:heater (option) NOTE : 1. N conducts to #4, L conducts to #5. 2. OPEN: #8 conducts to #6,CLOSE: #8 conducts to #7. 3. Using less than 3A current for A, B, C, D, E, F. 10
Wiring Diagram L250 / L500 Input Power 24V AC On-Off Controller Input Power Actuator H: heater (option) NOTE : 1. N conducts to #1, L conducts to #7. 2. L conducts to #3 for OPEN, L conducts to #4 for CLOSE. 11
Wiring Diagram L250 / L500 Input Power 24V DC On-Off Controller Input Power Actuator H: heater (option) NOTE : 1. + conducts to 1, - conducts to 7. 2. - conducts to #3 for OPEN, - conducts to #4 for CLOSE. 3. Using battery to supply power for DC units. 12
Wiring Diagram L250 / L500 Input Power 1φ 110V, 220V AC Modulating Controller Signal Output Signal Output Signal Input Signal Input Input Power Input Power Actuator H: heater (option) NOTE : 1. Modulating board Input Signal: 4-20mA, 1-5V, 2-10V (It is suggested to use the shielding wire and its length should not exceed 30m.) Output Signal : 4-20mA, 2-10V 2. Using less than 3A current for A, B, C, D, E, F. 13
Wiring Diagram L250 / L500 Input Power 24V AC Modulating Controller Signal Signal Output Output Signal Input Signal Input Input Power Input Power Actuator H: heater (option) NOTE : 1. Modulating board Input Signal: 4-20mA, 1-5V, 2-10V (It is suggested to use the shielding wire and its length should not exceed 30m.) Output Signal : 4-20mA, 2-10V 2. Using less than 3A current for A, B, C, D, E, F. 14
Wiring Diagram L250 ~ L2000 Input Power 24V DC Modulating Controller Signal Output Signal Output Signal Input Signal Input Input Power Input Power Actuator H: heater (option) NOTE : 1. Modulating board Input Signal : 4-20mA, 1-5V, 2-10V (It is suggested to use the shielding wire and its length should not exceed 30m.) Output Signal : 4-20mA, 2-10V 2. Using less than 3A current for A, B, C, D, E, F. 3. Using battery to supply power for DC units. 15
Wiring Diagram L1000 / L2000 Input Power 1φ 110V, 220V AC On-Off Controller Input Power Actuator H: heater (option) NOTE : 1. N conducts to #1, L conducts to #7. 2. L conducts to #3 for OPEN, L conducts to #4 for CLOSE. 3. Using less than 3A current for A, B, C, D, E, F. 16
Wiring Diagram L1000 / L2000 Input Power 24V AC On-Off Controller Input Power Actuator H: heater (option) NOTE : 1. N conducts to #1, L conducts to #7. 2. L conducts to #3 for OPEN, L conducts to #4 for CLOSE. 17
Wiring Diagram L1000 / L2000 Input Power 24V DC On-Off Controller Input Power Actuator H: heater (option) NOTE : 1. + conducts to #1, - conducts to #7. 2. - conducts to #3 for OPEN, - conducts to #4 for CLOSE. 3. Using battery to supply power for DC units. 18
Wiring Diagram L1000 / L2000 Input Power 1φ 110V, 220V AC Modulating Controller Signal Output Signal Output Signal Input Signal Input Input Power Power Supply Actuator H: heater (option) NOTE : 1. Modulating board Input Signal: 4-20mA, 1-5V, 2-10V (It is suggested to use the shielding wire and its length should not exceed 30m.) Output Signal: 4-20mA, 2-10V 2. Using less than 3A current for A, B, C, D, E, F. 19
Wiring Diagram L1000 / L2000 Input Power 24V AC Modulating Controller Signal Output Signal Input Input Power Input Power Actuator H: heater (option) NOTE : 1. Modulating board Input Signal: 4-20mA, 1-5V, 2-10V (It is suggested to use the shielding wire and its length should not exceed 30m.) Output Signal: 4-20mA, 2-10V 2. Using less than 3A current for A, B, C, D, E, F. 20
Adjustment Modulating Control Board CAUTION: To adjust the following settings, turn power off FIRST. 1. Layout The layout is based on the actuator in L250, L500 and 110 / 220V AC voltage. LED Indication Dip Switch Lamp Indication Sensitivity Switch Setting 2. Procedure Input Signal: 4 ~ 20mA 2 ~ 10V DC 1 ~ 5 V DC Comparison Part Control Part Control Object Part Control Volume 3600 VR (5K Ohm) Output Signal: 4 ~ 20mA 2 ~ 10V DC Feedback Supplied Voltage : 24V AC / DC, 110V / 220V AC 1- Phase 21
ADJUSTMENT Modulating Control Board 3. Dip-switch Setting (SW) ON OFF Analog signal output 8 7 6 5 4 3 2 1 ON OFF OFF OFF ON OFF OFF ON Factory setting OFF ON 4-20mA input OFF OFF 1-5V input ON OFF 2-10V input OFF ON OFF 4-20mA output ON OFF ON 2-10V output OFF ON 20mA / 5V / 10V means valve fully-open 20mA / 5V / 10V means valve fully-closed ON OFF Close valve if input signal disconnected ( when S6 sets OFF ) OFF ON Open valve if input signal disconnected ( when S6 sets OFF ) ON OFF ON OFF Actuator will not operate if input signal disconnected (when S6 sets OFF ) MODBUS 8 7 6 5 4 3 2 1 ON ON ON ON ON MODBUS OFF OFF OFF Actuator will not operate if input signal disconnected Note: 1. After dip switch setting finished, press reset button or restart the actuator. 2.The standard factory presetting is 1, 4, 8 for ON and 2, 3, 5, 6, 7 for OFF. 22
ADJUSTMENT Modulating Control Board Analog signal output Dip-Switch setting FUNCTION SETTING 1~5V set 1-OFF / 2-OFF. S1, 2 INPUT SIGNAL SELECT. 2~10V set 1-OFF / 2-ON. 4~20mA set 1-ON / 2-OFF. S3, 4, 5 OUTPUT SIGNAL SELECT. 2-10V set 3-ON / 4-OFF / 5-ON. 4-20mA set 3-OFF / 4-ON / 5-OFF. When S6 sets ON S7, 8 POSITION SELECT (When the input signal fails) valve fully-closed set 7-ON / 8-OFF. valve fully-open set 7-OFF 8-ON. valve stops set 7-ON / 8-ON.Or 7-OFF / 8 - OFF. When S6 sets OFF S7, 8 POSITION SELECT (When the input signal fails) valve fully-closed set 7-OFF 8-ON. valve fully-open set 7-ON / 8-OFF. valve stops set 7-ON / 8-ON.Or 7-OFF / 8 - OFF. MODBUS Dip-switch Setting FUNCTION SETTING S1~5 MODBUS SELECT MODBUS set 1~5-ON. S6~8 POSITION SELECT (When the input signal fails) valve stops set 7-OFF / 8 - OFF. 23
ADJUSTMENT Modulating Control Board 4. Lamp Indication Lamp OPD OP REM PL SL LOC CL CLD LR Actuator State Fully-open position Opening Direction Remote Control Mode Alerting Signal Setting Mode Local Control Mode Closing Direction Fully-closed position Power 24
ADJUSTMENT Modulating Control Board 5. LED Indication a. Setup Flow Chart MODE 25
ADJUSTMENT Modulating Control Board b. The function of LED indication LED indication Function Error log Basic Parameter Local Control Fast Setting Auto Run Running time setting The travel of VR Wrong input signal Input signal setting for fully-closed position Input signal setting for fully-open position Sensitivity Setting Fully -closed position setting Fully- open position setting Feedback signal setting for fully-closed position Feedback signal setting for fully-open position Baud rate setting for Modbus Station setting for Modbus Display setting 26
7 Linear Valve Actuator Sun Yeh Ele. Ind. Co., Ltd 2015.09 ADJUSTMENT Modulating Control Board 6. Sensitivity Switch Setting(SR1) 1 2 3 0 4 9 5 8 6 SR1: 1,2,3~ 0 Sensitivity switch: 1. Factory setting for software edition U20 is 3. Factory setting for software edition U21 is 0. * The software edition will be displayed on LED indication when the actuator powers on. 2. When switching to "1", it will respond at the highest level of sensitivity. When switching to "0", it will respond at the lowest level of sensitivity. 3. The factory setting of the accumulated variation in sensibility for each movement is 0.3mA and the total variation can be divided into approx. 54 movements. 7. Modulating Board Setting (Auto run) a. Press Mode five times until get into on LED indication. b. Keep pressing SET (around 5 sec ) until LOC comes on, entering the Auto run mode. c. When the Auto run is completed, LOC comes off and the actuator will stop running. The parameter setting is completed. If the Modulating board setting could not satisfy your request, the signal is needed to be adjusted separately, please follow the steps of signal setting. (page 28) 27
ADJUSTMENT Modulating Control Board 8. Signal Setting MODE A. Input signal setting for fully-closed position a. Press MODE several times until get into, then press Set once to enter signal setting mode. b. Get into, and keep pressing Set (around 3 sec) until glittering. c. Supply the input signal according to the dip switch setting (1V or 2V or 4mA). d. Press Set once to complete the input signal setting for fully-closed position. e. Press Mode twice. 28
Adjustment Modulating Control Board B. Input signal setting for fully-open position a. Press MODE several times until get into, then press Set once to enter signal setting mode. b. Adjust with Up and Down until get c. Keep pressing Set (around 3 sec) until glittering. d. Supply the input signal according to the dip switch setting (5V or 10V or 20mA). e. Press Set once to complete the input signal setting for fully-open position. f. Press Mode twice. C. Output signal setting for fully-closed position Install the ammeter or monitor correspond to output signal setting. a. Press MODE several times until get into, then press Set once to enter signal setting mode. b. Adjust with Up and Down until get into. c. Keep pressing Set. (around 3 sec) d. Adjust the output value with Up and Down until the value can fit with your request. e. Press Set once to complete the setting. f. Press Mode twice. 29
Adjustment Modulating Control Board D. Input signal setting for fully-open position Install the ammeter or monitor correspond to output signal setting. a. Press MODE several times until get into, then press Set once to enter signal setting mode. b. Adjust with Up and Down until get c. Keep pressing Set. (around 3 sec) d. Adjust the output value with Up and Down until the value can fit with your request. e. Press Set once to complete the setting. f. Press Mode twice. 30
Adjustment Modulating Control Board 9. MODBUS Setting Modbus and modulating controller can t be operated at the same time. a. Adjust the dip switch (SW) Pin1~Pin5 to ON position;pin6~pin8 to OFF position. b. Baud rate setting Press Mode twice until get into. Press Set once to get into. Press Down ten times to enter to. Keep pressing Set (around 3 sec) until the LED indicator glittering, to get into setting mode. Adjust Up and Down to set baud rate for Modbus. Adjust to your demand value. (default valve #4) Setting Value Baud rate 4 9600 5 19200 Press Set once to complete the setting. c. Station Setting Press Down and get into. Keep pressing Set (around 3 sec) until the LED indicator glittering, to get into setting mode. Adjust Up and Down to set the station. (Station Range:1-127, default Station 1) 31
Press Set once to complete the setting. d. Press Mode four times to back to home page. 10. Warning Message a. Press Mode once to get into, then press Set once to get into warning message. b. Adjust Up and Down to review the history log of warning message c. Warning message: Item Warning Message Item (9,8,7 0) Warning Message Solution (The latest data) Wrong Input signal a. Check if the input signal and dip switch setting are correct. b. Input signal fault. abnormal Hand-wheel a. Check if the hand wheel is pulled out completely N/A (The oldest data) The latest data will stay with the item 9. 32
Adjustment Modulating Control Board d. Example If you want to check the latest data, press Mode several times until get into Press Set once The LED display will show the latest date. If you want to check data item 2, press Mode several times until get into Press Set once Press Down seven times and the LED display will show the data item 2. 33
TROUBLE SHOOTING ON-OFF Controller 1. Motor does not operate and overheats Possibilities Solution a. Valve s rubber is getting hardened or the valve s thrust is excessive (it takes longer time to reach fully-closed position). b. Foreign objects in the flow stream. c. Broken motor stem or bearing. d. Hand-wheel is not pulled out completely. 2. The actuator operates well but the motor is hot. Possibilities a. Use hand-wheel for test or change to a new valve. b. Check if any obstructions c. Replace to a new part d. Press the hand-wheel, then pull it out completely. Solution a. Actuator operates too frequently (Starting frequency is too high). b. Overload. c. Under or over rated voltage. a. Change system bandwidth (refer to P2). b. This situation often happens after operating for a long time. It is suggested to replace a new valve. c. Check the supply circuit (refer to P4~P5). d. Wrong power supply. d. Check the power supply. 3. The valve can not fully-open or fully-closed by either power supply or hand-wheel. Possibilities Solution a. The actuator does not mount with the valve tightly during installation process. b. The thrust of valve is larger than the thrust of actuator. c. The installation of actuator and valve is not correct. 4. The PCB board is failed. Possibilities a. Contact technical department to solve the problem. b. Replace to a new valve or a larger actuator. c. Check the installation procedures of the valve and actuator. (P7) Solution a. PCB board failed. a. Send back to factory for inspection. 34
Modulating Controller 1. The LED is flashing after the operating check is completed. Solution Refer to operation manual. 2. The lamps on the modulating board are normal but the actuator can t work properly during test or it only can turn to fully open/closed position. Possibilities The signal is connected oppositely (means to signal failure). Solution Confirm if the input signal and the wiring are correct (terminal #6 connects to and terminal #7 connects to + ). 3. Can not operate by modulating controller. Possibilities a. Hand-wheel is not pulled out completely, ( PL LED indicator is glittering) b. Faulty VR. c. The sector gear of the VR is loose. d. Wrong input signal. e. Faulty modulating board. Solution a. Press the hand-wheel, then pull it out completely and check if the PL indicator comes off. b. Replace to a new VR. c. Remove the input signal wires. Operate the actuator to fully-closed. Then readjust the VR. d. Check if the input signal is correct. e. Send back to factory for inspection. 35
Warranty SUN Yeh Elec. Co., Ltd warrants that for a period of twelve months from the date of manufacture. It will either repair or replace, at its option, any of its products which prove to be defective in material or workmanship. This warranty does not cover damage resulting from causes such as abuse, misuse, modification or tampering by users. This warranty is extended only to the immediate purchaser of Sun Yeh product and is not transferable. To obtain service under this warranty, the purchaser must first acquire a return authorization from Sun Yeh. Products must be returned to Sun Yeh under freight prepaid. This warranty is lieu of all other obligations, liabilities or expressed warranties. Any implied warranties, including any implied warranty of merchantability are hereby expressly excluded. In no event shall Sun Yeh be liable for special, incidental or consequential damages arising in connection with the use of its products, or for any delay in the performance of this warranty due to causes beyond its control. 36