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Contacts on my rtu keep popping out. Model 48TMD020.. any suggestions ?

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Can you provide me with the wiring instructions, I want to replace the old analog thermostat. I have a roof mounted not ducted Advent A/C and a furnace unit.


The terminal board on the rtu should match fairly closely with the letter designations on the thermostat. R, W ,(possibly W2) G, Y, (possibly Y2) and C. W2 and Y2 are most likely NOT used on a small capacity rtu (roof top unit) as those terminals are for a second stage of heating and a second stage of cooling.

The thermostat terminals should be Rc, Rh, W, G, Y and C (common). IF the replacement thermostat is programmable the common terminal should be used because that allows the thermostat to run on 24vac and not just battery power.

There should be a factory jumper installed across Rc and Rh and that should stay in place as the two terminals are for systems that have TWO different control transformers. Small capacity rtu's will have only ONE transformer.

Some rtu's have a W2 terminal as well as a Y2 terminal even though they do not have the second stages of heat. You have to determine exactly what your system is prior to changing the thermostat.

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1 Answer

It keeps popping up write protection on and won't let me take pictures


Look at your memory card. SD and SDHC cards have a slide switch along one edge. The position farthest from the metal contacts locks the card, protecting it from writes. The position nearest the contacts unlocks the card.

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How do you refill roundup pump and go container with sprayer, cant work it out. IT WOULD BE A GOOD IDEA IF MANUFACTURES GAVE INSTRUCTIONS HEY.


Any Roundup Weed & Grass Killer RTU can be refilled with the new 1.25 gallon Roundup Weed & Grass RTU Refill bottle OR use Roundup Super Concentrate (purple cap).

Directions to Refill with Roundup Super Concentrate
  • 24oz RTU: 1 oz of RoundUp Super Concentrate, fill with water very slowly to avoid foaming.
  • 1/2 Gallon RTU: 2 1/2 fl. oz. of Roundup Super Concentrate and slowly add 1/2 gallon of water
  • 1 or 1.1 Gallon RTU: 5 oz RoundUp Super Concentrate, fill slowly with 1 gallon of water
  • 1.33 Gallon (PNS & PNG): Add 6.5 fl oz of the Super Concentrate to container and slowly fill with water

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RUDD Serial RTU 5581F120114360 What is the tonnage or size on this RTU. Which of the numbers indicate the size. Thanks


Hi,
The serial number will not give you the sizing, but the model number will.
You will need to get the model number to get the info you want.

heatman101

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1 Answer

Need to know unit size


ckl60 5 ton about a 2003 model on most ac heat pumps the model number reflects the ton sized by 12000 btus per ton also as for the indoor unit cfm rating 400 cfm per ton

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Tcp slave messages are not forwarded to rtu master


I think your last sentence there might be what the situation really is.  Your not getting a reply back. Maybe you should check the response timeout the gateway has set on it for the slave.  You probably already know a slave’s response time can fluctuate wildly depending on the nature of the request sent, so maybe the timeout setting is too short? Its a place to start. .

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