Does anyone know the maximum distance that my DX Loop Manifold can be from my air-handler?  Is there a max vertical distance as well?  Thanks.

Maximum horizontal distance from the manifold of the loop field to the air handler is stated 125ft. This would be assuming the heat pump was located somewhere in the middle of this lineset. Maximum vertical from manifold to heatpump is 20ft, and from heatpump to air handler is 40ft. This is info out of the installation guide. We don't do alot of these systems, but I hope this answers your question. This is assuming you are talking about an Earth Link System.
Dan

Yes, Earthlinked System. Perfect. Thanks.

Not to nit pick, rather to clarify...Dan's answer is mostly correct, just maybe a little misleading. The max. is 125' length of lineset from manifold to air handler. This is not just a horizontal distance. It's a total length, vertical and horizontal total.

The other numbers he listed are correct. 20 feet vertical rise from the manifold to the compressor, and another 40' rise to the air handler from the compressor.

Yea, thanks Clark. This is what can make these systems difficult to work into some sites. the 125' of overall lineset sometimes is difficult since loopfields in most states need to be 100ft from wells and septic systems.

50' in Utah. But yes, this can be an issue in some instances.