0000002471 00000 n 0000003416 00000 n %PDF-1.6 %���� Economizers are one of the most misunderstood, misdiagnosed, and most often "gutted" control systems on a HVAC unit. 0000232911 00000 n There are 3 basic reasons for using economizers. C. Economizing when it should not. 3. 0000232523 00000 n 6. 327 0 obj <>stream For more information regarding these features, consult the Honeywell W7215 manual included with the Economizer kit. By using an economizer this is done by conducting the feedwater supply to the economizer wherein the exhaust gas passes over tubes carrying the feedwater. 0000066657 00000 n •Dew point–and–dry bulbdisables economizer operation when outdoor air exceeds a fixed dry-bulb (75°F [24°C]) OR a fixed dew-point (55°F [13°C]) temperature. 0000002955 00000 n They provide free cooling when the outdoor temperature is capable of cooling a space. 5. %%EOF 0000006685 00000 n 0000047226 00000 n Economizers lower energy consumption, meaning lower energy costs. H�l�]�U!���*x6��+���� Draw a straight line between point A and B. xref See the following table for potentiometer settings. Air tem perature sensor failure/fault. False To operate properly, an economizer requires controls that will sense: 509 06 2501 02 3 FIGURE 3 Hood Assembly Economizer A B C D Ship Weight DNECOMZR020A02 33.37 17.43 19.05 29.50 55 DNECOMZR021A03 40.37 22.28 24.48 36.27 80 Measure mixed air (outdoor and return air) temperature. x�b```f``����� �� ̀ �@1V ��`��B k00p^l���Mn���EmŽK5��c�� *���U�1!���J�&�sE��h�L9ܪ;i.s�&ߵ��N��F4�� �: ��'v��ᡛ The factory-installed 620 ohm jumper must be in place across terminals SR and +. 0000072384 00000 n • Adjust A-B-C-D setting to “D” (Humid Climates) – For changeover control economizer should be disabledFor changeover control, economizer should be disabled and outside air damper at minimum if outside air conditions are greater than 55°F (dry bulb) or between 20 and 22 Btu/lb (enthalpy). Mark that point on the top line of chart 1 and label point “C” (70 oF, 21 C shown). (See Figure 5.) %PDF-1.6 %���� 5. �����'DcY�~zP�"��r�`@AH �5�n���Y���V� trailer SOLID STATE ECONOMIZER SYSTEM The setpoint scale markings, located on the W7459, are A,B,C and D. Turn the setpoint potentiometer fully clockwise to the D setting. �|��s4^5`�`)b9�z .��] ����M���t)�:�f4c��n)"Y� ƽ�v 0000067260 00000 n Screw panel to economizer on left side, and into door bracket on right side of panel. Mark that point on the top line of chart 1 and label point “C” (70 oF, 21 C shown). �����Ӽ/���^:MUM��'�I�*NLT�����ȧcco���l������lxKKS�Ĕ?� '���^�s�lc[�`,�]��� ��y63��)���A�I����v�ck�pҤ��2^ޝ�?u�$N/�ȿ��y:s�c�PtTŃ5c[;��aWYi*��&y�[�}8����dJ��OMfY[ • Enthalpy setpoint on W7459 Economizer sets combination of air temperature and humidity suitable for free cooling. Using outside air allows the GDL to operate without a chilled water plant for more than 75 percent of the year. set to on in settings menu N/A California Title 24 Fault Detection & Diagnostics Fault Categories A. 0000006246 00000 n The selection is made on the ECA. x�bbd```b``^ … Types Of Economizers Dry Bulb Economizer - This economizer uses a sensor to determine if outdoor air is at or below a certain temperature, usually about 55 degrees F. If the outdoor air temperature is below setpoint and there is a call for cooling, an actuator opens a damper, allowing the outdoor air to mix with the return air to provide cooling. In the midwest most settings are set to D (and I always remember it as “D” for dummies. It works for me and I never forget).”D” will only let the economizer start to open when it … It is further recommended to always set the control at C or above.) (The suggested setting is between A & B 70° DB @ 55 percent RH. 0000233129 00000 n Otherwise, the control should be based on the prescribed system type as shown in Table 6.7.4-1 . line of chart 1 and label the point “B” (74 oF, 23 C shown). line of chart 1 and label the point “B” (74 oF, 23 C shown). 0000004407 00000 n Install side panel to the right side of hood, see figure 9. <]>> Economizer Logic Module in in. `���A4"�&�t�g��aI����l�3�'>4�:*��3�8X��)� ���^�UK?��ۅ�\J����s�V2r�����ߥ@:��K��g�����J!|� d��-�ف���aQÄ @~��1�:F;� ��vS 7. and C. Hwakong Cheng wrote a great piece that was published in the 2010 November issue of the Ashrae Journal, called Why enthalpy economizers don’t work. CO2 Sensor | SEN-CO2-B-01-01-0 VOC Sensor | SEN-VOC-A-01-01-0 Ion Generator | ION-0A*0 Mounting Plate | UNV0016 OPTIONAL ACCESSORIES Humidity Sensor | SEN-HUM-A-02-02-0 BP Sensor | SEN-DP-C-01-03-0 BACnet Translator | TRANS-A*-001 *indicates customer part selections. 0000001915 00000 n 0000068021 00000 n 0000233560 00000 n Draw a vertical line through point C. 8. Full open – when controller is made to provide 24 Vac to D and T, motor is energized and runs full open. 0000002859 00000 n Some older economizer dampers allow through as much as 5% to 10% of outside air when completely closed due to leakage. 0000070887 00000 n endstream endobj 312 0 obj <> endobj 313 0 obj <> endobj 314 0 obj <> endobj 315 0 obj <> endobj 316 0 obj <> endobj 317 0 obj <> endobj 318 0 obj <> endobj 319 0 obj <> endobj 320 0 obj <> endobj 321 0 obj <> endobj 322 0 obj <>/ColorSpace<>/Font<>/ProcSet[/PDF/Text/ImageC/ImageI]/Properties<>/ExtGState<>>> endobj 323 0 obj [/Indexed/DeviceRGB 255 345 0 R] endobj 324 0 obj <> endobj 325 0 obj <>stream Full closed – when controller circuit opens power is removed from terminals T and D, and the motor spring returns to the full closed position. The economizer module also provides a provision for remote damper position control. It is further recommended to always set the control at C or above.) D) their leanest practical mixture delivery at cruising speeds and enriched by means of the economizer system at higher power settings. … Min. 0000025154 00000 n с��8����48��6�{��1Jqh*%"�:>p�� T�w�G"zB@��ő����G����w��p�� E. Excess outdoor air. (mm). ��ɔ;���DΦ��8�\K���rڢ�:)�k�QY7��/#��w�}*���|�����3�>��m{�����7X���ϼ 0000233460 00000 n Yet, when you understand them, they really are a simple control system. D. Adjust the enthalpy control to position A, B, C, or D to achieve the maximum combination of temperature and humidity acceptable for the installation as per Table 2. Dry bulb economizer The dry bulb economizer senses only the temperature of the air and not the humidity. position control of economizer systems on HVAC equipment. The control should be no economizer when the baseline building cooling capacity $\leq$50 tons AND the baseline building system total cooling capacity $\leq$95,000 Btu/h. Are a, B, C, D setting is between a & B 70° DB @ percent... 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