UE H400 Manuals

GENERAL Pressure variations are sensed by a bellows, diaphragm or piston sensor which either actuates or de-actuates one, two or three snap-acting switches at a pre-determined set point(s). Set point(s) is adjusted by turning an internal knob and pointer (H types) or internal screw (J types). Tools Needed Screwdriver Hammer Adjustable wrench MOUNTING INSTALL UNIT WHERE SHOCK, VIBRATION AND TEMPERA- TURE FLUCTUATIONS ARE MINIMAL. ORIENT UNIT SO THAT MOISTURE IS PREVENTED FROM ENTERING THE ENCLO- SURE. IF UNIT IS BEING INSTALLED WHERE HEAVY CONDENSATION IS EXPECTED, VERTICAL MOUNTING (PRESSURE CONNECTION DOWN) IS REQUIRED. DO NOT MOUNT UNIT IN AMBIENT TEMPERA- TURES EXCEEDING PUBLISHED LIMITS. 400 Series pressure controls can be mounted in any position, provided the electrical conduit is not facing up. The preferred mounting position is ver- tical (pressure connection down). The cast-in knockouts for 3/4” electrical conduit are located on the side and rear of the enclosure. These can easily be knocked out by placing the blade of a screwdriver in the groove and rapping sharply with a hammer. Mount the unit via the (2) 1/4” screw clearance holes on the enclosure. See Dimensions. Units may also be mounted via the NPT pressure con- nection. ALWAYS HOLD A WRENCH ON THE PRESSURE HOUSING HEX WHEN MOUNTING UNIT. DO NOT TIGHTEN BY TURNING ENCLOSURE. THIS WILL DAMAGE SENSOR AND WEAKEN SOLDER OR WELDED JOINTS. U N I T E D E L E C T R I C C O N T R O L S Installation and Maintenance Instructions IMP400-07 Please read all instructional literature carefully and thoroughly before starting. Refer to the final page for the listing of Recommended Practices, Liabilities and Warrantees. 400 Series Pressure Controls Types: H400, H402, H403, H400K, H402K, J400, J402, J403, J400K, J402K Part I - Installation WIRING DISCONNECT ALL SUPPLY CIRCUITS BEFORE WIRING. ELECTRICAL RATINGS STATED IN LITERATURE AND ON NAME- PLATE SHOULD NEVER BE EXCEEDED. OVER-LOAD ON A SWITCH CAN CAUSE FAILURE ON THE FIRST CYCLE. WIRE UNITS ACCORDING TO LOCAL AND NATIONAL ELECTRI- CAL CODES. MAXIMUM RECOMMENDED WIRE SIZE IS 14 AWG. Connect conduit to the case and wire directly to the switch terminals accord- ing to local and national electrical codes. Bring the wires up to terminals from the rear of the case. (See fig. 1.) If manual reset switch or DPDT options are used, lead wires are supplied, color coded as follows: ALLOW ENOUGH SLACK SO AS NOT TO AFFECT SWITCH MOVE- MENT WHEN MAKING SETTING ADJUSTMENTS AND ENSURE THAT THE WIRES ARE NOT TOUCHING THE COVER WHEN INSTALLED. NOTE: For larger wire gauges, a one time shift may be experienced or expected due to space limitations within the enclosure. Verify setpoint after installation. NOTE: The middle switch assembly is omitted for dual switch controllers. The outer switch assemblies are omitted for single switch controllers. Type “J” controls have internal screw adjustments and type “H” have cam assem- blies for internal calibrated adjustments. Switch 1 Switch 2 Common Violet Yellow Normally Open Blue Orange Normally Closed Black Red Figure 1 Special Instructions For Vacuum Ranges On vacuum ranges, the C-NO circuit is closed at sea level condi- tions. Therefore, increasing vacuum will cause the C-NC circuit to close while decreasing vacuum will cause the C-NO circuit to close. Please make a note of this and wire/adjust the unit accordingly. Tools Needed Screwdriver NOTE: For set point adjustments and re-calibration, connect control to a calibrated pressure gauge. Type J400 & J400K Remove cover. Switch has screw adjustments inside enclosure. Increase gauge pressure until switch transfers. To RAISE the pressure setting turn the screw IN To LOWER the pressure setting turn the screw OUT. One full turn corresponds to approximately 10% of range on diaphragm and piston models, and approximately 20% of range on bellows models. When making adjustments, do not exceed the proof* pressure rating on nameplate. Types J402, J403 & J402K Remove cover, follow same procedure as paragraph above. Switches may be set together or apart, up to 100% of range (maximum separation on models 520-535 is defined in Table 1). On dual switch, either switch may be set high. On triple switch models, the third (middle) switch has no over-travel mechanism and must always be set to the highest pressure when switches are set apart. Altering the setting of one switch will usually have little effect on the other(s), however re-calibration may be desired at a critical pressure setting and after changing switch(es). Table 1 Special Instructions for Models 520-535 When calibrating the Models 520-535, Switch 2 (the right switch as viewed from the front of the control) must be set to the higher pressure value. Use a screwdriver to turn the adjustment screw and obtain the desired actuation pressure for Switch 2. Switch 1 can then be set following the procedure outlined for the Type J400 and J400K. Maximum separation between Switch 1 and 2 is defined in Table 1. Types H400, H402, H403, H400K & H402K Remove cover, switch has knob and pointer adjustment inside enclosure. Controls are factory calibrated for maximum accuracy at the dial midpoint. Switches may be set together or apart up to 100% of the range scale. On dual switch models either switch may be set high. On triple switch models, the third (middle) switch has no over-travel mechanism and must always be set to the highest pressure when the switches are set apart. Altering the setting of one switch will usually have little effect on the other(s), however re-calibration may be desired at a critical setting or after changing switch(es). To re-calibrate, turn pointer to desired set point and add gauge pressure until switch transfers. If gauge pressure and set point pressure do not agree, turn zero adjust screw clockwise to raise and counter clockwise to lower pressure setting (See Figure 2). Types with Manual Reset (Option 1530) These optional models incorporate a snap switch that, when actuat- ed, remains tripped until pressure decreases and the reset button is manually depressed to the reset position. Types J400K & J402K with Option M210 (indicator models 147, 157, S147B, S157B only) To adjust for maximum accuracy at any desired set point, follow steps 1 - 4 below: SPAN ADJUSTMENT 1) Remove front window and gasket (four screws) to gain access to span adjustment. 2) Connect control to calibrated pressure source and set to required differential pressure. 3) Using a screwdriver, carefully turn span adjustment (See Figure 3) to obtain required indication. 4) Re-mount front gasket and window. Tools Needed Screwdriver USE ONLY FACTORY AUTHORIZED REPLACEMENT PARTS AND PROCEDURES. DISCONNECT ALL LIVE CIRCUITS BEFORE PROCEEDING. COMPONENTS AVAILABLE FOR REPLACEMENT ARE THE SWITCHES. OTHER COMPONENTS FACTORY REPLACEABLE ONLY. Part III - Replacements Part II - Adjustments Switch Separation Model & Range (% of Range Span) 520, 530 (-300 to 0 VAC) 25% 521, 531 (-10 to +10 "wc) 35% 522, 532 (-50 to +50 "wc) 35% 523, 533 (0.5 to 5 "wc) 50% 524, 534 (2.5 to 50 "wc) 50% 525, 535 (10 to 250 "wc) 20% *Subjecting the switch to proof pressure may cause a shift in set point REPLACEMENT OF SWITCH(ES) 1) Disconnect leadwires. 2) Remove the two mounting screws. On multi-switch controls, first remove switch bias springs (See Figure 1.) 3) Insert replacement switch and replace screws and bias springs. 4) Check switch set point and re-calibrate per PART II if necessary. Dimension A Models Inches mm NPT Models Inches mm NPT Pressure Pressure 126-164 5.81 146,84 1/4 551, 553-555 4.56 115,88 1/4 S126B-S164B 6.19 157,16 1/2 550, 552 5.03 127,79 1/4 270-376 5.50 139,70 1/4 570-572 4.56 115,89 1/4 440-443, 449, 610-614 6.44 163,58 1/4 451, 453, 454 4.28 108,74 1/4 Differential Pressure 448, 450, 452 5.03 127,79 1/4 147-157 6.13 155,57 1/4 520-525 8.62 218,90 1/2 S147B-S157B 6.13 155,57 1/2 530-535 8.12 206,20 1/2 455-559 7.00 178,05 1/4 540-543 7.90 200,7 1/8 544-547 8.06 204.7 1/8 Option M210 - Differential Pressure Indication Surface Mounting Hardware Part Number 6361-704º Dimensions Figure 3 Span Adjust Screw Figure 2 Zero Adjust Screw Re-Calibration Adjustment - H Types