We've lived in our house 11 years. Our air conditioning (condenser) unit, the big boxy thing sitting outside, is not sitting on a concrete slab. It's just sitting on the ground and we noticed this spring that water was pooling and it was actually sitting in several inches of water. Them more I think about it, the angrier I get that the inspector didn't catch this 11 years ago. I've read that mounting it on the house is the best solution but that's not an option. What do I need to do (get a concrete slab poured for it to sit on and check yearly that it's level?) and who do I call to help (an electrician?) I obviously don't know what I'm doing so any help is appreciated. Code requires outdoor condensers be installed on a reasonably level surface raised at least 3 inches above ground level. If water pools in the lower part of the unit during cold weather and then freezes, the condenser coils can be damaged by ice expansion and that will often end the life of the unit, although the outdoor condenser can sometimes be replaced.

As Tester101 said, there are prefab pads made for this and if you can raise your unit without damaging any lines that are connected then you may be able to do this without an A/C technician. Great care must be taken not to kink or break the refrigerant lines if you attempt this. Otherwise, you will need an A/C contractor to recover the old refrigerant and disconnect and temporarily cap the lines; and then after you install an acceptable pad the A/C contractor will need to install a new refrigerant dryer, reconnect the lines, purge the lines with nitrogen, evacuate the system to a deep vacuum, and correctly recharge the system with new refrigerant. If everything goes well this is around a half-day of work (not including installation of a new pad). 2009 Uniform Mechanical Code 1106.2 "Supports and Anchorage" last paragraph: A compressor or portion of a condensing unit supported from the ground shall rest on a concrete or other approved base extending not less than three (3) inches (76mm) above the adjoining ground level.

Admittedly, this language does not use the phrase "reasonably level" and it is not the most current version.Browse other questions tagged electrical hvac air-conditioning or ask your own question.This Recommended Practice outlines the electrical performance characteristics for a continuous duty, diesel or gasoline engine driven brushless alternator unit for supplying 400-Hertz electrical power to commercial transport aircraft. It is intended to assist the airlines in standardizing recommendations for various sizes and configurations of equipment and it is a guide for the preparation of detailed specifications. The unit is primarily intended to supply power to the aircraft during passenger loading and unloading, and during servicing operations. The combination of the equipment specified herein and the interconnecting cables(s) between the 400-Hertz alternator and the aircraft shall provide power characteristics at the aircraft receptacle which meet MIL-STD-704 requirements for Category 'B' equipment.

Other limits which are necessary to meet specific conditions must be specified by the purchaser.You may already have access. Members: login to see discount.hotel motel heating cooling units If you are currently using this technical report:how much do ac units cost to run Technical Papers / Journal Articlessingle room heating cooling units Home  >   Ground Power Unit 40 to 180 KVA (AC-DC) / 28.5 VDC / Battery Cart Ground Support Equipment for aircraft Functioning similar to a standard diesel generator it supplies power to a parked aircraft on ground through 200 / 115V 400Hz AC and / or 28.5V DC Voltages. This can be used for powering of various aircraft systems and also starting aircraft engines employing an electric starter mechanism.

Available in Towable Trailer mounted / Skid Mounted / Self propelled configurations. AC – DC GPU Ground Support Equipment Highly reliable Deutz / Cummins Equivalent diesel engines Digital System – Micro controller based Secure power supplies to aircraft Operations through GUI touch screen Total digital monitoring of engine and output parameters Meets latest EPA norms Walk Away – Protection and Control (Unattended Operation) Meets MIL and ARP Standards MAK’s Remote Diagnosis and Monitoring System(Optional) 40/ 90 / 140 / 180 KVA at 0.8 PF Lagging Deutz / Cummins / Detroit Diesel / Equivalent diesel engine MAK / Equivalent brushless, 3 phase, constant voltage alternator with built in AVR. Class F / H 40 / 90 / 140 / 180 KVA at 0.8 pf lagging, 3 phase 4 wire system 115V (Line to Neutral) and 200V (Line to Line) a. 1% at balanced load b. Within 4% with 1/3rd load on one phase with two other phases unloaded.

±20% and ±1% of steady state value recovery within 150 milli seconds 382 to 417 Hz, ±1% of steady state value recovery within 2 seconds Following parameters are displayed through GUI touch screen. Engine Lube oil pressure Low lube oil pressure shutdown High coolant temperature shutdown Charge fail (only indication) OTHER COMBINATIONS (Both on Diesel & A.C. Motor Driven) 40 KVA AC or AC & DC 60 KVA AC or AC & DC 90 KVA AC or AC & DC 140 KVA AC or AC & DC 180 KVA AC or AC & DC Note: Due to continuous development dimensions, layout, configuration and specifications are subject to change without notice.No membership or credit card requiredHvacRoofingNo thanks, I'm not quite ready.January 31, 2016 21:17 This section describes how to set up the CONNEX Ground Unit (receiver). We highly recommend that you use the provided AMIMON accessories and cables. If alternate products are used, make sure that they are of the highest quality.

To set up the CONNEX Ground Unit: Refer to the Placement Guidelines for a description of mandatory requirements and best practices for optimal placement of the Ground Unit and its antennas. Screw on the five provided antennas to the five Ground Unit antenna connectors, as shown below: Connecting the Ground Unit Antennas – Box 4 Enable display of the received video by connecting the provided standard HDMI cable (Box 7) from the Ground Unit HDMI port to the monitor’s HDMI port (click here for details). Connect the provided power AC adapter (Box 5) to the power port on the Ground Unit labeled 7-17-VDC (click here for details), and connect the other end to a power source. The provided power AC adapter should be used indoors only. Verify that all three LEDs on the Ground Unit light up (On), as described in the tables below. Ground Unit – Power LED The Ground Unit is powered On and the unit’s On/Off switch (click here for details) is on.