Alco Controls

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114 Alco Controls Thermostats Basic Terms and Technical Information Characteristics ALCO thermostats are electric circuit control devices which open or close an electric contact depending on temperature changes at the bulb. Description of bulb charges The application range of thermostats is mainly determined by the charge. Accordingly various bulb shapes and sizes are necessary. • Vapour charge, bulb type A, E, P The thermosystem is filled with a medium in vapour phase. A thermostat with vapour charge operates in accordance with temperature changes at the bulb as long as the bulb is the coldest part in the whole system (bellows, capillary tube, bulb). ALCO thermostats are equipped with a bellows heater (82 k Ohm, 230 V) to avoid such conditions. On applications with low current the bellows heater has to be removed. Max. bulb temperature is 150°C (70°C for bulb type E). Response time is very fast. • Liquid charge Bulb type C: Bulb must be warmer than capillary tube and bellow (i.e. for heating purpose). Max. bulb temperature is 210° C. Response time is fast. • Adsorption charge, bulb type F This charge only reacts on temperature changes at the bulb. Max. bulb temperature is 100°C. Response time is slow but perfectly suitable for common refrigeration systems. Adjustment of switching points A thermometer should always be used for comparison when adjusting the switching points on temperature controls. The setting scale on the device is intended to serve for orientation, showing the setting range of the upper switching point tmax in °C and °F and the value of the temperature differential ∆t in K as difference between the upper switching point tmax and the lower switching point tmin. The upper switching point tmax has to be adjusted on the scale, whereas the lower switching point tmin is given by adjustment of the desired switching differential ∆t. The formula is: Upper switching point – Differential = Lower switching point tmax – ∆t = tmin Important! The differential ∆t mentioned on the differential scale and in the technical data refers to the upper part of the setting range and the upper switching point. In the lower part of the setting range an increase of the differential ∆t can be expected. The lowest possible lower switching point tmin is mentioned in the selection tables and is helpful to select switching points with large differentials ∆t in the lower temperature range. Bulb Sizes A E P C F Vapour Vapour Vapour Liquid Adsorption 2m, capillary coil, 0m 2m, capillary with 2m, capillary 2m, capillary with bulb function C and D 6m with bulb with bulb A2.5.1/1003/E
Function of contacts A2.5.1/1003/E SPDT - On temperature rise above setting 1-2 opens and 1-4 closes. - On temperature drop below setting 1-2 closes and 1-4 opens. SPDT with off switch AUTO matic - STOP Standards and regulations Important for the installation of thermostats: EN 60730-2-9 Specification for temperature controls and temperature cut-outs. EN 60947-1/ Specifications for low-voltage EN 60947-5-1 switchgear. EN 378: Refrigerating systems and heatpumps. Safety and environmental requirements. SPDT with manual reset min. - On temperature drop below setting 1-2 closes, 1-4 opens and latches. - The device can be manually reset when the temperature has risen at least 2K above setting. Alco Controls SPDT with manual reset max. - On temperature rise above setting 1-2 opens and 1-4 closes and latches. - The device can be manually reset when the temperature has dropped 2K below setting. SPDT with bellows heater includes a 82 k Ohm, 230 V AC/DC resistor 115
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Alco Controls Components for Heat P
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A2.5.1/1003/E Electrical Control Va
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A2.5.1/1003/E Alco Controls Page Pr
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A2.5.1/1003/E Electrical Control Va
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Electrical Control Valves Series EX
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Liquid temperature Correction Facto
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Application Expansion Valve and Liq
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A2.5.1/1003/E Multiply above nomina
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Application Condensing Pressure Reg
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Application hot gas flow such as he
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Application hot gas flow such as he
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A2.5.1/1003/E Electronic Controller
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Electronic Superheat Controllers an
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Network Communication and System Ma
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Universal Driver Modules Series EXD
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Accessories Terminal kits, cables T
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Coldroom Controller Series EC3 Temp
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Block Diagram EC3-33x Coldroom Cont
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Selection table Accessories Descrip
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Rack and Condenser Controllers Seri
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Block Diagrams EC3-65 Rack Controll
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Network Accessories Description Cab
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Pressure Transmitter Series PT5 A2.
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Electronic Fan Speed Controller Ser
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Electronic Fan Speed Power Module F
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A2.5.1/1003/E Thermo ® -Expansion
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A2.5.1/1003/E Example Cooling capac
Page 65 and 66: TI Valve bodies without cage and nu
Page 67 and 68: A2.5.1/1003/E Alco Controls Capacit
Page 69 and 70: A2.5.1/1003/E Alco Controls Condens
Page 71 and 72: A2.5.1/1003/E Nominal capacity (Qn)
Page 73 and 74: A2.5.1/1003/E Alco Controls R 407C
Page 75 and 76: Type Code Power Assembly Refrigeran
Page 77 and 78: Liquid Correction Factor K t Temper
Page 79 and 80: Thermo ® -Expansion Valve Series Z
Page 83 and 84: Spare Parts A2.5.1/1003/E Available
Page 85 and 86: Spare Parts Description Type Part N
Page 89 and 90: A2.5.1/1003/E Solenoid Valves Alco
Page 91 and 92: Coils ASC A2.5.1/1003/E Standards
Page 93 and 94: 2-Way Solenoid Valves Series 540 No
Page 95 and 96: 2. Liquid Application Liquid Correc
Page 97 and 98: A2.5.1/1003/E Mechanical Pressure R
Page 99 and 100: Hot Gas Bypass Regulators Series AC
Page 101 and 102: Correction Tables for Series ACP an
Page 103 and 104: Crankcase Pressure Regulator Series
Page 105 and 106: A2.5.1/1003/E Pressure Controls and
Page 107 and 108: A2.5.1/1003/E Standards and Regulat
Page 109 and 110: Single Pressure Controls Series PS1
Page 111 and 112: Dual Pressure Controls PS2 TÜV / E
Page 113 and 114: Pressure Controls Series PS3 / Stan
Page 115: Differential Pressure Controls Seri
Page 119 and 120: Room Thermostats Top Operated Therm
Page 121 and 122: A2.5.1/1003/E System Protectors, Mo
Page 123 and 124: Bi-flow Filter Driers Series BFK he
Page 125 and 126: Water and Acid Capacity Connections
Page 127 and 128: Water Adsorption Capacity Type Unit
Page 129 and 130: Filter Drier Shells Series FDH for
Page 131 and 132: A2.5.1/1003/E Alco Controls Correct
Page 133 and 134: Suction Line Filters and Filter Dri
Page 135 and 136: BTAS - Water and Acid Adsorption Ca
Page 137 and 138: Moisture Liquid Indicators Series A
Page 139 and 140: A2.5.1/1003/E Oil Management Compon
Page 141 and 142: Electronic Oil Level Management Sys
Page 143 and 144: Oil Separator Series OS A2.5.1/1003
Page 145 and 146: A2.5.1/1003/E Suction Accumulators,
Page 147 and 148: Ball Valves Series BVE / BVS new ve
Page 149 and 150: A2.5.1/1003/E Accessories, Spare Pa
Page 151 and 152: Cable Assemblies with Plug A2.5.1/1
Page 153 and 154: A2.5.1/1003/E Alco Controls Descrip
Page 155 and 156: Saturation Pressure Table for Refri
Page 157 and 158: Suction accumulators (continuation)
Page 159: A2.5.1/0909/E Emerson Electric GmbH
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