Plumbing Dehumidifier Drain Lines For Your Grow | Growing Green Vol 7

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00:00 Intro
00:14 Why You Want A P-Trap
02:05 Slope Check
02:12 Installation
03:48 Let Plenty Of Water Flow Through The Unit
04:27 Water Reclaimation
05:40 Measure Twice Cut Once
06:04 Summary

When setting up the perfect environment for your grow room, your plumbing and HVAC system go hand-in-hand. Setting up a drainage and water reclamation system for every HVAC device can extend the longevity of your units and recycle the moisture from the grow room for reuse.

Why You Want a P-Trap

In a fully optimized cannabis grow room, a p-trap plumbing pipe is an integral component for keeping your systems clean, extending their longevity, and reducing maintenance times. P-traps are commonly used throughout homes under sinks in the bathroom and kitchen.

In an indoor grow room, equipment that contain an evaporator coil and condenser coil require condensate drain systems. Condensate disposal requires removing the condensate from all evaporators and cooling coils.  

A p-trap is a u-shaped plumbing pipe that should be installed on your air conditioner and dehumidifiers to improve the drainage process. A PVC union connector is an alternative to plumbing glue or sealant that can connect and disconnect two pipes together for easier cleaning, maintenance, or replacement.

When your units are on, they create negative pressure which can pull air through the drain port which can cause water to sit inside of your dehumidifier or air conditioner. The water that fills the u-shaped portion of the p-trap can actually stop the negative airflow through the pipe to keep the inside of your unit free from water. 

Slope Check

When installing condensate piping, you need to make sure it has a certain slope for better function. The International Mechanical Code (IMC) dictates that condensate waste piping should have a minimum 1/8 inches of fall for every 12 inches of horizontal run. Gravity will do most of the heavy lifting when draining your units from there.

Installation

Every HVAC unit (air conditioner and dehumidifier) should have a p-trap installed. Double-check that the complete drain line from your air conditioner and dehumidifier has the appropriate slope. Any dramatic dips in slope in the condensate piping can clog the drain line and create a backup.

Small room dehumidifiers can have a condensate drain pan that must be emptied out by hand.  Many larger-space dehumidifiers have a port to allow for connecting a water hose or pipe to a drain. The water from the units can be drained into a floor drain or basement sink using gravity alone.

If your air conditioning system and dehumidifier cannot be connected to a drain, you may need to collect the condensate from the drain line in a large and heavy bucket. Keep in mind, you may need to empty out the bucket once a day.

After attaching your p-trap piping, you can make a 90-degree elbow down to the ground and another 90-degree elbow at ground-level to direct water to your drain. 

Using gravity to drain your HVAC system is one of the most efficient methods but it requires placing your dehumidifier and AC in a high position compared to where your water will be drained. 

If this is not possible, you can invest in a condensate pump to move the water up the grade through the water pipes. Or choose a dehumidifier that already has a built-in condensate pump to keep the water flow moving.

Let Plenty of Water Flow Through the Unit

After installing a brand new air conditioner or dehumidifier, you should let plenty of water flow through at first. During the manufacturing of these devices, they use a lot of oil and solder, so a lot of the drained water is going to be very   dirty for the first 100 gallons or so. Do not reclaim any of this water. 

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