HUMIDITY CHAMBER SCO26H SCO26H-2 PREVIOUSLY DESIGNATED 2428H 2428H-2 W ITH MICRO PROCESSOR CONTROL INSTALLATION AND OPERATION INSTRUCTIONS Revised 01/2014 4861693 Sheldon Manufacturing Inc. P.O. Box 627 Cornelius, Oregon 97113 EMAIL: tech@Shellab.com INTERNET: http://www.Shellab.
TABLE OF CONTENTS SECTION 1.0 RECEIVING AND INSPECTION SECTION 2.0 GRAPHIC SYMBOLS SECTION 3.0 INSTALLATION AND FACILITIES REQUIREMENTS SECTION 4.0 CONTROL OVERVIEW SECTION 5.0 THEORY OF OPERATION SECTION 6.0 OPERATION SECTION 7.0 MAINTENANCE SECTION 8.0 TROUBLESHOOTING SECTION 9.0 PARTS LIST SECTION 10.0 UNIT SPECIFICATIONS SECTION 11.0 HUMIDITY VS CONDENSATION CHART SECTION 12.0 WIRING DIAGRAM SECTION 13.
1 Section INTRODUCTION Thank you for choosing a humidity testing incubator. These units are not intended for use at hazardous or household locations. Before you use the unit, read this entire manual carefully to understand how to install, operate, and maintain the unit in a safe manner. Your satisfaction with the unit will be maximized as you read about its safety and operational features. Keep this manual for use by all operators of the unit.
2 Section RECEIVING AND INSPECTION Your satisfaction and safety require a complete understanding of this unit, including its proper function and operational characteristics. Read the instructions thoroughly and be sure that all operators are given adequate training before attempting to put the unit into service. NOTE: This equipment must be used only for its intended application; any alterations or modifications will void your warranty. 1.
3 Section INSTALLATION Local city, county or other ordinances may govern the use of this equipment. If you have any questions about local requirements, please contact the appropriate local agency. Installation may be performed by the end user. It is unnecessary for this unit to be installed by a technician.
3.6 Humidification Water Supply: On the back of the body there is a 1/4" compression fitting marked WATER IN. This fitting should only be plumbed to a DISTILLED WATER supply source. Please note that when attaching the water supply line to the fitting on the unit, two wrenches must be used: one to hold the fitting from turning in the panel, while using the other to tighten the compression fitting.
4 Section GRAPHIC SYMBOLS Your incubator has been provided with a display of graphic symbols which is designed to help in identifying the use and function of the available user adjustable components. Symbol Identification Indicates that you should consult your operator’s manual for further instructions. Indique que l'opérateur doit consulter le manuel d'utilisation pour y trouver les instructions complémentaires.
3 5 Section CONTROL OVERVIEW 4.1 4.2 4.3 4.4 4.5 4.6 4.7 4.8 Power Switch: The main power I/O (On/Off) switch controls all power to the unit, and must be in the I/On position before any systems are operational. Over Temperature Limit: This control is marked “Set Over Temp” and is adjacent to the power switch. It is completely independent of the Main Temperature Controller and guards against any failure which would allow the temperature to drastically rise past set point.
6 Section THEORY OF OPERATION These humidity chambers are designed to maintain temperature and relative humidity at set points controllable by the operator at the front panel. Air is constantly being circulated through the chamber, monitored for comparison to set points and controlled as necessary.
7 Section OPERATION It is recommended that your unit be allowed to reach operating temperature before engaging the humidifying system. This requires setting the RH set point to the farthest counterclockwise position until the unit is at operating temperature. See Section 6.6 for changing the RH set point. 7.1 Turn the power switch to the I/ON position. Turn the Over Temp Limit thermostat to its maximum position, clockwise and place the shelves in the chamber. 7.
7 8 Section MAINTENANCE Warning: Prior to any maintenance or service on this unit, disconnect the power cord from the power source. Before reattaching the unit to its power source, be sure all volatile and flammable cleaners are evaporated and dry. Avertissement: Avant d'effectuer toute maintenance ou entretien de cet appareil, débrancher le cordon secteur de la source d'alimentation.
9 Section TROUBLESHOOTING and SERVICE Always make a visual inspection of the unit and control console when troubleshooting. Look for loose or disconnected wires which may be the source of the trouble. The incubator is designed so that no internal electrical servicing should be required under normal conditions. If electrical servicing is necessary, it should be performed by qualified service personnel. For information on where to reach technical service please see the manual cover.
4/ is the Over Temp Limit Thermostat set high enough? – for diagnostics, should be turned fully CCW with the pilot light never on 5/ has the fuse/circuit breaker blown? Indicated chamber temperature unstable 1/ ±0.
3/ verify that relays are working 4/ verify that float switch is working 5/ confirm that heater is working a- power to coil b- is unit burned/shorted out 6/ pressure switch is working 7/ plumbing leak Humidity unstable 1/ circulating fan failure a- motor failure or no voltage to motor b- fan not turning c- ducts blocked 2/ relative humidity is lower than the unit can achieve at that operating temperature 3/ chamber leaks a- motor shaft seals b- door seal c- air intake flapper MECHANICAL Door not sealing 1/
1/ Some condensation may be normal 2/ Minimize the movement of air around the unit and reduce the number of door openings 3/ Turn the humidity control counterclockwise until the condensation level is acceptable Contamination in chamber 1/ see cleaning procedure in operator’s manual 2/ develop and follow SOP for specific application; include definition of cleaning technique and maintenance schedule Service If none of the suggestions listed above in the Troubleshooting guide have solved the problem Customer
10 Section PARTS LIST SCO26H (2428H) SCO26H-2 (2428H-2) 115V 220V Adjustable Feet 2700500 2700500 Blower Wheel, Aluminum 2600535 2600535 Blower Wheel, Plastic 2600544 2600544 Circuit Breaker 1100500 1100500 Element 2350563 2350554 Fan Blade 2600551 2600551 Fan Motor 4880564 4880563 Float Switch 7850563 7850563 Humidity Control 1750553 17560554 Humidity Sensor 4100504 4100504 Motor U.E.C.
11 Section UNIT SPECIFICATIONS Weight Shipping Net All Models 480 lbs. 341 lbs. Dimensions Exterior WxDxH (in.) Interior WxDxH (in.) All Models 44 x 32.75 x 57 Capacity Cubic Feet All Models 28.5 Temperature All Models 28 x 20.
12 Section RELATIVE HUMIDITY CHART
13 Section WIRING DIAGRAM SCO26H (2428H) (9851429) FUSED INLET 4200505 EMI FILTER 2800503 BLACK WHITE WHITE BLACK GREEN CHERRY ROUND POWER SWITCH 7850532 POWER ON LIGHT 4650554 P1 P7 WHITE 14 BLACK P3 DOOR SWITCH 7850578 OTL RED 1750862 BLACK BLACK TEMPERATURE DISPLAY 1750726 4-20MA BOARD CO2 & TEMP 1750667 RECORDER JACKS 6900522 RED 18G RED 18G 4-20MA BOARD RH 1750945 BLACK 18G RED 18G BLACK 18G OTL LIGHT 4650553 4 1 P9 P10 2 BLACK 18G 10 WHITE P8 HEAT LIGHT 5 9 RED P5 WHIT
WIRING DIAGRAM SCO26H-2 (2428H-2) (9851430) FUSED INLET 4200505 EMI Filter 2800503 BLACK WHITE WHITE BLACK GREEN CHERRY ROUND POWER SWITCH 7850532 POWER ON LIGHT 4650554 P1 P7 BLACK WHITE 14 BLACK P3 BLACK RED BLACK TEMPERATURE DISPLAY 1750726 4-20MA BOARD CO2 & TEMP 1750667 RECORDER JACKS 6900522 RED 18G RED 18G 4-20MA BOARD RH 1750945 BLACK 18G RED 18G BLACK 18G 4 WHITE BLACK 18G 10 1 2 ½ OTL 1750813 6 P8 P9 4 HEAT LIGHT 5 9 RED P5 OTL LIGHT 4650553 RELAY 7030531 ORANG
14 Section PLUMBING DIAGRAM
