C HUNDER Symptom - rhs.com · 6) Remove O-rings and replace with part number Swagelok VI-P4T-K2....
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THUNDER SCIENTIFIC CORPORATION The Humidity Source T h u n d e r S c i e n t i f i c w w w . t h u n d e r s c i e n t i fi c . c o m SLD#0102 www.thunderscientific.com Support Link Document Symptom Humidity setpoint control instability, system will not reach setpoint control at dryer humidity setpoints, 10% RH. Unstable flow setpoint control actual. Cause Two motorized valves maintain humidity setpoint control in the 2500. The Flow Valve (V1) and Expansion Valve (V2) both valves are designed with o-rings that require inspection and maintenance. O-ring wear or damage can cause instability of the saturation pressure control and flow control stability of the 2500. Solution Replacement of the o-rings in the flow and expansion valve assemblies can be accomplished with the following illustrated procedure. Tech Note TSD#0205 and TSD#0206. The part number for the replacement o-rings is VI-P4T-K2. Replacement o-rings can be purchased from Thunder Scientific Corp. Please contact Thunder Tech Support at 1-800-872-7728 or e-mail [email protected] should you have problems or questions while using this procedure. Please e-mail your comments and suggestions to [email protected]. Options For Prevention Yearly inspection of the o-rings installed in the flow and expansion valves, plus lubrication of the o-rings with Dow Corning silicon grease number 111, will be helpful in maintaining proper operation of your system. TECHNICAL SUPPORT CENTER
Transcript of C HUNDER Symptom - rhs.com · 6) Remove O-rings and replace with part number Swagelok VI-P4T-K2....
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SLD#0102
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Support Link Document
Symptom
Humidity setpoint control instability, system will not reach setpoint control at dryer humiditysetpoints, 10% RH. Unstable flow setpoint control actual.
Cause
Two motorized valves maintain humidity setpoint control in the 2500. The Flow Valve (V1)and Expansion Valve (V2) both valves are designed with o-rings that require inspection andmaintenance. O-ring wear or damage can cause instability of the saturation pressure controland flow control stability of the 2500.
Solution
Replacement of the o-rings in the flow and expansion valve assemblies can be accomplishedwith the following illustrated procedure. Tech Note TSD#0205 and TSD#0206. The partnumber for the replacement o-rings is VI-P4T-K2. Replacement o-rings can be purchasedfrom Thunder Scientific Corp. Please contact Thunder Tech Support at 1-800-872-7728 ore-mail [email protected] should you have problems or questions while usingthis procedure. Please e-mail your comments and suggestions to [email protected].
Options For Prevention
Yearly inspection of the o-rings installed in the flow and expansion valves, plus lubrication ofthe o-rings with Dow Corning silicon grease number 111, will be helpful in maintainingproper operation of your system.
TECHNICAL
SUPPORT
CENTER
2500EXPANSION VALVE
O-RING REPLACEMENT PROCEDURE
Revision Date: 24 Sept. ‘99
623 WYOMING, S.E. ALBUQUERQUE, NEW MEXICO 87123-3198 TEL: (505) 265-8701FAX: (505) 266-6203
www.thunderscientific.com
THUNDER SCIENTIFIC CORPORATION
1) Disconnect power from the 2500 system. Remove the right top panel.
2) Remove the expansion valve insulation block.
3) Using two 9/16 wrenches loosen fittings on both sides of the expansion valve.
4) Remove two allen cap screws that secure the valve bracket.
5) Remove snap ring at the base of the expansion valve.
6) Rotate the expansion valve body up as shown.
7) Remove two phillips screws at the drive motor. Lift the drive motor off of thevalve assembly.
8) Be Careful to hold the micro switch roller arm away from the shaft coupling toprevent bending of the switch roller arm. Remove the valve plug from the bodyhousing as shown in step 9.
10) Remove O-rings and replace with part number Swagelok VI-P4T-K2.Regrease O-rings and valve with Silicon Grease part number 111 Dow CorningValve Lubricant.
9) Remove the valve plug from the body housing as shown.
11) Check that all valve coupling set screws are secure, then reassemble.
Please Call 1-800-872-7728 Or Fax 1-505-266-6203, should you have any questions.
2500FLOW VALVE
O-RING REPLACEMENT PROCEDURE
Revision Date: 24 Sept. ‘99
623 WYOMING, S.E. ALBUQUERQUE, NEW MEXICO 87123-3198 TEL: (505) 265-8701FAX: (505) 266-6203
www.thunderscientific.com
THUNDER SCIENTIFIC CORPORATION
1) Disconnect power from the 2500 system.Remove the right rear panel, disconnect the exhaust fan power connection.
2) Remove the snap ring at the base of flow valve.
3) Remove two allen cap screws that secure the valve bracket.
4) Remove two phillips screws at motor. Lift drive motor off of the valve assembly.
5) Remove the valve plug from the body housing as shown. Be Careful to hold themicro switch roller arm away from the shaft coupling to prevent bending of theswitch roller arm.
6) Remove O-rings and replace with part number Swagelok VI-P4T-K2.Regrease O-rings and valve with Silicon Grease part number 111 Dow CorningValve Lubricant.
7) Check that all valve coupling set screws are secure, then reassemble.
Please Call 1-800-872-7728 Or Fax 1-505-266-6203, should you have any questions.
