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2 Stage HVAC system

Created by: shauns at: 5/21/2012 11:26 PM (2 Replies)

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5/21/2012 11:26 PM	Rate (0)
shauns Regular Member Joined: 5/21/2012 Last visit: 9/1/2024 Posts: 24 Rating: (0)	Hi I'm trying to come up with a solution for control of a 2 stage HVAC system. I have a packaged AC unit that had two independent refrigeration circuits (ie two compressors two reversing valves) and we are trying to gain more manual control than the installed siemens RWD45 gives us. I have started a logo file which I have attached, this is my first time playing with any form of automation so I may have it all backwards! What I am trying to achieve is the following Manual and Auto Control (Heat, Auto, Cool) Momentry On and Off Inputs Room Sensor. which logo will determine stages of heat/cool (I Have a siemens QAA24/AP) Return Air sensor Timer, when on is pressed unit will run for max time to prevent being left on Timer so when units cylce off or mode is changed there is a standdown time to let system equlize before re-starting Intergration of fresh air damper with varible 0-10V input to damper motor The program I have at the moment seems to do what I want except for the intergration of the fresh air damper as I'm still a bit unsure how I should intergrate it (suggestions on this would be great!) Also I think my compressor timing my be a bit crude. Any help or insight would be appreciated, remember i'm a newbee Shaun Attachment Luxmore Aircon 2.zip (284 Downloads)

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5/22/2012 9:22 PM	Rate (0)
Andres [Str] Posts: 153 Rating: (17)	Hi. I can't precisely tell about RWD45, but I managed to start 2 systems of ventilation with the controler siemens rlu200 and the logic module Siemens logo!. The logic module operated blocking of system and coordinated operation of the controler with peripherals. I ask to pay attention to the following. The logic can work with sensors рт100 and рт1000. Whether but I can't tell awakes to work with the sensor of temperature Ni1000. You can attach the scheme of existing installation. I think it probably to make with module.
Andres [Str] Posts: 153 Rating: (17)
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5/27/2012 10:13 PM	Rate (0)
shauns Regular Member Joined: 5/21/2012 Last visit: 9/1/2024 Posts: 24 Rating: (0)	Hi I have had a look over the RLU range. The largest RLU still only has 5 inputs. The current setup is like the picture I have attached (out of RWD manual). Thanks Shaun Attachment RWD45 Config.jpg (275 Downloads)

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