Pressure switch Type KP
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- Rose Cleopatra Morris
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1 MAKING MODERN LIVING POSSIBLE Data sheet Pressure switch Type KP KP switchs are for use in refrigeration and air conditioning systems to give protection against excessively low suction or excessively high discharge. KP switches are also used for starting and stopping refrigeration compressors and fans on air-cooled condensers. A KP switch can be connected directly to a single-phase AC motor of up to approx. 2 kw or installed in the control circuit of DC motors and large AC motors. KP switches are fitted with a single-pole double-throw (SPDT) switch. The position of the switch is determined by the switch setting and the at the connector. KP switches are available in IP30, IP44 and IP55 enclosures. Features y Ultra-short bounce time thanks to snap-action function (reduces wear to a minimum and increases reliability) y Manual trip function (electrical contact function can be tested without the use of tools) y Types KP 6, KP 7 and KP 7 with fail-safe double bellows element y Vibration and shock resistant y Compact design y Fully welded bellows element y High reliability both electrically and mechanically Approvals CE-marked in accordance with: LVD 2006/95/EC (EN , EN , EN ) PED 97/23/EC, category IV (EN 2263): KP, KP 2, KP 6, KP 7 and KP 7 Underwriters Laboratories Inc., UL listed China Compulsory Certificate, CCC Ship approvals Germanischer Lloyd, GL Det Norske Veritas, Norway, DNV Registro Italiano Navale, RINA Bureau Veritas, BV Lloyd s Register, LR Russian Maritime Register of Shipping, RMRS DKRCC.PD.CD0.A5.02 / 520H838
2 Technical data Ambient temperature Ambient temperature (PED approved units) Max. working Max. test C (80 C for max. 2 hours) C (80 C for max. 2 hours). LP: PS/MWP = 7 bar HP: PS/MWP = 35 bar KP 6: PS/MWP = 46.5 bar LP: Pe = 20 bar HP: Pe = 35 bar KP 6: Pe = 46.5 bar AC =6 A, 400 V Contact load Alternating current Direct current AC3 = 6 A, 400 V AC5 = 0 A, 400 V DC3 = 2 W, 220 V control current solid / stranded mm 2 Wire dimensions flexible, without ferrules mm 2 flexible, with ferrules mm 2 Tightening torque Rated impulse voltage max. 2 Nm 4 kv Pollution degree 3 Short circuit protection, fuse Insulation Enclosure 6 A 400 V IP30 / IP44 / IP55 Contact systems Low (LP) High (HP) Dual (LP/HP) Dual (LP/HP) Dual (HP/HP) SPDT+LP signal SPDT+LP+ SPST 2 DKRCC.PD.CD0.A5.02 / 520H838
3 Technical data (continued) Cable connection The cable entry can be used for 6 4 mm dia. cables. A Pg 3.5 screwed cable entry can also be used for 6 4 mm cable. With 8 6 mm cable a standard Pg 6 screwed cable entry can be used. Enclosure IP30 to EN / IEC Enclosure IP30 is obtained when the units without top cover are mounted on a flat surface or bracket. The bracket must be fixed to the unit so that all unused holes are covered. IP44 to EN / IEC Enclosure IP44 is obtained when the units with top cover are mounted on a flat surface or bracket. The bracket must be fixed to the unit so that all unused holes are covered. KP switches with auto reset are supplied with top cover. For KP switches with manual reset, the top cover must be separately ordered (code no for single switches and code no for dual switches). IP55 to EN / IEC IP55 is obtained when the KP switches are mounted in an IP55 enclosure, (code no for single switches and code no for dual switches). IP55 enclosure has to be ordered separately. Materials in contact with the medium Type KP, KP 2, KP 5, KP 6, KP 7, KP 5 and KP 7 KP A, KP 5A, KP 6, KP 7A and KP 5A only Material Tinbronze, no. CW452K, EN 652 Nickel plated free cutting steel, no /.078, EN 0277 Stainless steel 8/8, no..4306, EN Free cutting steel, no..0737, EN 0277 Cold forming steel, no..0338, EN 039 Steel, no.0308, EN 0305 Free cutting steel, no..075, EN0277 Free cutting steel, no..078, EN 0277 Aluminium, no. AW-3005, EN 573 DKRCC.PD.CD0.A5.02 / 520H838 3
4 Ordering For HCFC and non-flammable HFC refrigerants Pressure Type Low (LP) High (HP) Reset Low LP High HP Contact system / 4 in. 6 mm flare Code no. Connection / 4 in. ODF solder 6 mm ODF solder Low KP Auto SPDT ) ) ) Low KP Auto SPDT )3) Low KP (Min.) SPDT Low KP Auto SPDT ) ) High KP Auto SPDT ) ) ) High KP (Max.) SPDT Dual KP Auto Auto SPDT + LP signal ) ) Dual KP Auto Dual KP Auto Dual KP (Min.) (Max.) (Max.) (Max.) SPDT + LP signal SPDT + LP signal ) SPDT + LP signal Dual KP Conv. 2) Conv. 2) SPDT + LP signal Dual KP Auto Auto Dual KP Auto (Max.) SPDT + LP and SPDT + LP and Dual KP Conv. 2) Conv. 2) SPDT + LP and Dual KP Conv. 2) Conv. 2) SPDT + LP and ) ) ) ) For R77, HCFC and non-flammable HFC refrigerants Pressure Type Low (LP) High (HP) Reset Low LP HP Contact system High M Code no. Connection m cap. tube with M Low KP A Auto SPDT ) Low KP A (Min.) SPDT High KP 5A Auto SPDT ) High KP 5A (Max.) SPDT Dual KP 5A Auto Auto Dual KP 5A Auto (Max.) SPDT + LP and SPDT + LP and ) Dual KP 5A Conv. 2) Conv. 2) SPDT + LP signal ) Pressure switches with gold-plated contacts 2) Conv.: optional automatic or manual reset 3) Enclosure IP44 4 DKRCC.PD.CD0.A5.02 / 520H838
5 Pressure switches PED 97/23/EC approved; EN 2263 For HCFC and non-flammable HFC refrigerants Pressure Type ) Low (LP) High (HP) Reset Low High LP HP Contact system / 4 in. 6 mm flare Code no. Connection 6 mm ODF solder Low KP Auto SPDT ) ) Low KP (Min.) SPDT Low KP Auto SPDT ) ) High KP 6W Auto SPDT ) High KP 6B (Max.) SPDT High KP 7W Auto SPDT ) ) High KP 7B (Max.) SPDT High KP 7S (Max.) SPDT ) Dual KP 7BS (Max.) (Max.) Dual KP 7W Auto Auto Dual KP 7W Auto Auto SPST SPDT + LP and SPDT+ LP signal ) ) ) Dual KP 7B Auto (Max.) SPDT Dual KP 7WB Auto Conv. 4) SPDT + LP and )3) For R77, HCFC and non-flammable HFC refrigerants Pressure Type Low (LP) High (HP) Reset Low LP High HP Contact system M Code no. Connection m cap. tube with M Low KP A Auto SPDT ) Low KP A Fixed 0.7 (Min.) SPDT Dual KP 7ABS 8 32 Fixed 4 (Max.) (Max.) SPST ) W = PSH ( switch), B = PZH ( switch with ext. reset), S = PZHH ( switch with int. reset) 2) Enclosure IP44 3) Factory setting: LP side: Range bar Pe, Diff. bar; HP side: Range 8 bar Pe, Diff. 4 bar fixed 4) Conv.: optional automatic or manual reset Pressure switch setting with convertible reset Low Manual reset ) Automatic reset Automatic reset Manual reset High Manual reset ) Manual reset Automatic reset Automatic reset ) Factory setting DKRCC.PD.CD0.A5.02 / 520H838 5
6 Design / Function Pressure switch, type KP KP, KP 2, KP 5 / / / 2 5 =2 mm 4 4 in. / 6 mm. Low (LP) setting spindle 2. setting spindle, (LP) 3. Main arm 5. High (HP) setting spindle 7. Main spring 8. spring 9. Bellows 0. LP connection. HP connection 2. Switch 3. Terminals 4. Earth terminal 5. Cable entry 6. Tumbler 8. Locking plate 30. Reset button KP =2 mm 4 in. / 6 mm MK Capillary tube for KP A, KP 5A and KP 5A R / 4 (ISO 7-) The switch in the KP has a snap-action function and the bellows moves only when the cut-in or cut-out value is reached. The bellows becomes connected to the low or high side of the plant through connection (0) or (). The design of the KP switch gives the following advantages: y high contact load y ultra-short bounce time y high resistance to pulsation y vibration resistance up to 4 g in the Hz y long mechanical and electrical life 6 DKRCC.PD.CD0.A5.02 / 520H838
7 Design (continued) KP 7W, flare KP 7W, solder MK MK.FW 5 6 mm KP 7BS MK. Pressure setting spindle 2. setting spindle 3. Main arm 5. Cable entry 8. Locking plate 25. Int. reset arm 30. Ext. reset button Types KP, KPA, KP2, KP6, KP6A, KP7 and KP7 units with designation W, B or S have been tested and approved by TÜV, Rheinland in accordance with EN Types KP6, KP6A, KP7 and KP7 have a double bellows: an outer bellows and a regulating bellows. When system exceeds the set value, the KP will automatically stop the plant. The double bellows system prevents loss of charge in the event of bellows rupture. A rupture in the inner bellows will cause the control cut-out to fall about 3 times less the set value, thus the refrigeration plant compressor will stop. A rupture in the outer bellows will cause the control cut-out to fall to about 3 bar under the set value, thus providing a fail-safe function. Versions with designation W or AW cut in again automatically when the has fallen to the set value minus the differential. Versions with designation B or AB can be cut in manually with the external reset button when the in KP has increased 0.7 bar above set value and in KP6 and KP7 has fallen 4 bar under the set value. Versions with designation S or AS can be cut in manually with the internal reset arm when the has fallen 4 bar under the set value. All KP switches, including those which are PED-approved, operate independently of changes in the ambient temperature around the control housing. Therefore the set cut-out and differential are held constant provided the permissible ambient temperatures are not exceeded. DKRCC.PD.CD0.A5.02 / 520H838 7
8 Terminology Reset. Manual (Min./Max.) reset: Units with manual reset can only be reset during operation by activation of the reset button. 2. Automatic reset: After operational stop, these units reset automatically. 3. Convertible reset: Units with optional reset can be activated by automatic and/or manual reset. Permissible working The permissible working is determined by the that can be safely allowed in the refrigerating system or any of the units within it. Test The test is the used in strength tests and/or leakage tests on refrigerating systems or individual parts in systems. The test is designated Pe. Snap function A certain contact force is maintained until irrevocable snap is initiated. The time during which the contact force approaches zero is thus limited to a very few milliseconds. Therefore contact bounce cannot occur as a result of, for example, slight vibrations, before the cut-out point. Contact systems with Snap function will change over even when micro-welds are created between the contacts during cut-in. A very high force is created during cut-out to separate the contacts. This force immediately shears off all the welds. Thus the cut-out point of the unit remains very accurate and completely independent of the magnitude of the current load. Setting Pressure switches with automatic reset LP: Set the LP start on the "CUT-IN" scale ( scale). One rotation of the low spindle 0.7 bar.set the LP differential on the "DIFF" scale. One rotation of the differential spindle 0.5 bar.the LP stop is the LP start minus the differential. Note: The LP stop must be above absolute vacuum (p e = - bar)! If with low stop the refrigeration compressor will not stop, check to ensure that the differential value has not been set too high! Pressure switches with automatic reset HP: Set the HP on the CUT-OUT scale. One rotation of the HP spindle 2.3 bar. Set the HP differential on the DIFF scale. One rotation of the differential spindle 0.3 bar. The HP start is the HP stop minus the differential. Start and stop s for both the LP and HP sides of the system should always be checked with an accurate gauge. Pressure switches with manual reset Set the stop on CUT-OUT scale ( scale). Low switches can be manually reset when the is equal to the stop plus the differential. High switches can be manually reset when the is equal to the stop minus the differential. 8 DKRCC.PD.CD0.A5.02 / 520H838
9 Dimensions [mm] and weights [kg] Pressure switchess with flare connection = = KP, KP 2, KP 5, KP 6, KP 7B, KP 7S and KP 7W KP 5 and KP 7W M connection =4 = KP A, KP 2A and KP 5A KP 5A, KP 7AS and KP 7ABS Solder connection KP, KP 2, KP 5, KP 7B, KP 7S and KP 7W KP 5, KP 7W KP with top cover = Net weight: KP, KP 2, KP 5 and KP 7: approx. 0.3 kg KP 5, KP 7 and KP 7BS: approx. 0.5 kg KP A and KP 5A: approx. 0.3 kg KP 5A and KP 7ABS: approx. 0.5 kg DKRCC.PD.CD0.A5.02 / 520H838 9
10 Dimensions [mm] and weights [kg] (continued) IP55 enclosure IP55 enclosure for dual types Weld nipple for KP-A 0 DKRCC.PD.CD0.A5.02 / 520H838
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