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Heaters
Heaters
Heaters
Benefits, technical details 164
Continuous thermal output 10 – 300 W 166
Particularly with fluct...
164
Heaters
Benefits, technical details
Rittal system climate control
Especially with outdoor siting, but also indoors, con...
165Rittal system climate control
Heaters
30°C
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160°C
170°C
130°C
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166 Rittal system climate control
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Tech...
Enclosure heaters
Continuous thermal output 10 – 300 W
167Rittal system climate control
Enclosureheaters
With this heater,...
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Rittal Pano Isıtıcıları

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Rittal Pano Isıtıcıları

  1. 1. 162
  2. 2. 163 Heaters Heaters Heaters Benefits, technical details 164 Continuous thermal output 10 – 300 W 166 Particularly with fluctuating ambient temperatures, such as those that occur with outdoor enclosure siting or in unheated rooms, enclosure heaters must be used to prevent condensation. All Rittal enclosure heaters operate on the basis of state-of-the-art PTC technology. Practical example of heaters Extreme temperature fluctuations provide the ideal conditions for the formation of condensation. Particularly when enclosures are sited outdoors, it is essential for the built-in electronics to function reliably. In order to maintain operational reliability, enclosure heaters are used. Where there is a risk of frost, the heater keeps the temperature level inside the enclosure at the operating temperature of the built-in electronic components. If there is a risk of condensation, the enclosure internal temperature is raised to above the dew point – hot air is capable of absorbing more humidity – thus helping to counteract condensation on electronic components. In particular, heaters with an integral or additional fan offer even greater efficiency. Enclosure heaters may be easily snap- mounted onto the 35 mm DIN EN 50 022 support rail, for example, or screw-fas- tened onto the mounting plate. The heaters are easily controlled using a thermostat and/or hygrostat. 1 2 Heater Electronic components 1 2
  3. 3. 164 Heaters Benefits, technical details Rittal system climate control Especially with outdoor siting, but also indoors, condensation poses a particular risk for control electronics. 7 different output categories ensure that the correct thermal output is always available. In this way, the total thermal output required can be distributed precisely within an enclosure, thereby effectively avoiding the overheating of individual components. Output and application diversity The output range of the three different Rittal enclosure heater systems, from 10 to 1,000 watts, ensures a high level of heating effectiveness in a confined space. The designs without fan and with fan (thermal output from 50 to 160 m3/h) provide a solu- tion for every specific applica- tion. Particularly in outdoor use, condensation poses a high risk. This may be counteracted by a regulated heater coordi- nated to the enclosure size and temperature difference. Simple assembly and reliable control Fast assembly This is achieved with a screw or snap fastening on the mounting plate or 35 mm DIN EN 50 022 support rails. No condensation, and always the right temperature The heater is activated as required via the hygrostat or enclosure internal thermostat.
  4. 4. 165Rittal system climate control Heaters 30°C 150°C 160°C 170°C 130°C 140°C 120°C 80°C 90°C 110°C 100°C 60°C 70°C 50°C 40°C 1 2 Benefits: ● Useful cooling output from 10 to 1000 watts ● Self-regulating PTC tech- nology ● Quick-assembly system Important ● For the correct tempera- ture and to avoid conden- sation, use a thermostat or hygrostat – cf. page 175 ● Heaters should always be installed in an upright position. Leave a dis- tance of 50 mm at the top and bottom to allow con- vection ● The thermal output is increased with fans ● Heat is distributed evenly in large enclosures by using several low-output heaters For general comments, see page 186 Calculation formulae, see page 187 or refer to the Internet at www.rittal.de The benefits of modern thermistor technology (PTC) The prerequisite for optimum conversion of electrical energy into thermal energy is perfect interaction between the thermal output, surface temperature and ambient temperature. Conventional resistor heaters The surface temperature is limi- ted via an additional safety thermostat. As a result, the heater is forever cutting in and out, which means that the con- tinuous thermal output actually produced is low. Rittal heaters with PTC technology Unlike conventional resistance heaters, in thermistors (PTCs), power consumption automati- cally decreases as the intrinsic temperature rises. The advan- tages of this dynamic output behaviour are as follows: ● Surface temperature is limi- ted without the need for additional temperature pro- tection devices ● Self-regulation achieves direct adaptation to the ambient temperature. In other words, as the enclo- sure internal temperature falls, the thermal output increases (cf. performance diagrams). ● A constant thermal output throughout a broad voltage range (e.g. 110 to 240 V AC/DC). ● Special voltages are pos- sible in the low voltage range (e.g. 12 V, 24 V) ● Long service life ● Compact, vibration-free mechanical structure ● In the event of a malfunc- tion, there is no risk of fire from incandescent elements Temperature variation through the aluminium section (Tu = 20°C) using the example of the heater SK 3102.000 = Temperature variation without fan = Temperature variation with fan 1 2
  5. 5. 166 Rittal system climate control 75 4535 80 125 4535 130 80 118 140 25 5.2 8.25 162 100 110 45 64 185 6445 168 □ 120 Technical specifications: ● Limitation of surface temperature via a PTC thermal element. ● If an axial fan (SK 3108.000) is attached to the heater SK 3107.000, its effective- ness may be enhanced. ● All heaters are quickly and easily mounted using the supplied screw and snap fastenings. ● Snap fastening for 35 mm support rail DIN EN 50 022. ● Maximum effectiveness is achieved by installing the enclosure heaters vertically, with the cable routing pointing down- wards. ● In order to create the necessary convec- tion, 50 mm spacing from the top and bottom is required. The distance from neighbouring components must be at least 50 mm. ● The unit housings are made from robust, black anodised aluminium. Supply includes: Unit ready to install with permanently attached connection cable (0.3 m). SK 3102.000 with fitted fan including terminal strip. Note: ● Thermostat SK 3110.000 (see accesso- ries) is recommended for precise tem- perature control in the enclosure. ● In order to prevent condensation on assemblies, hygrostat SK 3118.000 (see accessories) is recommended to regulate heating. ● In larger enclosures, even heat distribu- tion is best achieved by installing sev- eral low-output heaters. ● Internal installation is generally advis- able, even when using heat exchangers and cooling units, in order to prevent condensation. Model No. SK 3105.000 3106.000 3115.000 3116.000 3107.000 3107.000 + 3108.000 3102.000 (incl. fan) Rated operating voltage V, Hz 110 – 240 V AC/DC 110 – 240 V AC/DC 230 V, 50/60 Continuous thermal output at Tu = 20°C 10 W 20 W 30 W 50 W 130 W 200 W1) 300 W1) Pre-fuse T 2 A 4 A Special voltages available on request. We reserve the right to make technical modifications. 1) Output with fan. Accessories Packs of Page Thermostat 1 3110.000 175 Hygrostat 1 3118.000 175 Temperature indicator 1 3114.100 174 SK 3105.000 SK 3106.000 SK 3107.000 SK 3115.000 SK 3116.000 SK 3102.000 including fan Axial fan for heater SK 3107.000 Ball bearing Temperature range: –40°C/+85°C Rated operating voltage: 230 V, 50/60 Hz Power consumption: 18 W Noise level: 33 dB (A) Speed: 2800/3300 rpm Air throughput: 50 m3/h 38 3 3 79.5 79.5 6 71.5 71.5 4.3 310 Model No. SK 3108.000 Earthing lug for M4 or 8 – 32 UNC
  6. 6. Enclosure heaters Continuous thermal output 10 – 300 W 167Rittal system climate control Enclosureheaters With this heater, an axial fan supports heat distribution inside the enclosure. Approvals, see page 23. Performance diagrams Model No. SK 3102.000 / 3107.000 = SK 3102.000 (with fan SK 3108.000) = SK 3107.000 (with fan) = SK 3102.000 (without fan) = SK 3107.000 (without fan) °C W 200 – 20– 30 – 10 0 150 100 250 300 350 + 30+ 10 + 20 1 2 3 4 1 2 3 4 3105.000 / 3106.000 / 3115.000 / 3116.000 °C W 45 30 35 40 50 55 60 65 – 10– 20 5 10 15 20 0 + 10 + 20 + 30 25 SK 3115.000 SK 3116.000 SK 3106.000 SK 3105.000 Functional diagram

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