DMS-Series Air-Trap™: Negative and/or Positive Pressure Waterless Trap

Volume Pricing is Available - Please email info@waterless-trap.com for a discount code.

Never Freezes - Never “Dries” Out!

The Air-Trap™ allows liquid condensate to drain from the HVAC equipment and simultaneously prevents air from entering or escaping from the equipment.

Patented

The DMS-Series Air-Trap allows water to drain from HVAC equipment and simultaneously prevents air from escaping from or entering the equipment by way of the condensate drain line.

The DMS-Series Air-Trap does not require standing water to prevent gas (typically air) from flowing through the condensate drain line. With the occurrence of condensate, or other water sources within the unit, the water flows out of the HVAC unit, but no gas enters or leaves. When there is no production of condensate or water, there is no water in the trap and there is no gas flow through the trap. Install the DMS-Series Air-Trap in a vertical orientation.

The benefits of the DMS Air-Trap

• Operates dry except when condensate is being produced 

• Will not freeze and will never pass gas 

• No sludge build-up in bottom of trap

• Easily comes apart for cleaning

• Operates under both positive and negative pressure

• Meets general building codes. For use on HVAC equipment only.

• Meets code IMC Section M307.2.4.1 for Ductless Mini-splits

Specifications
Maximum negative pressure of WC =   -1"
Maximum positive pressure of WC =    +5/8"
Available connection sizes: 3/4" (25 mm), 5/8" ID Drain Hose
Length 2.95 inches
Flammability rating is UL94 V-0
Air-Traps Meet IMC® Code Section M307.2.4.1

DMS-Series Operation

DMS Air-Traps will properly drain condensate for negative pressures to -1" WC and positive pressures to +5/8" WC while allowing essentially no air to enter or leave through the drain line. After condensate production ceases there will be no standing water within the drain line or trap if line is installed per code, i.e. 1/8" per foot slope or greater toward final drain point and no sags in the line.

No More Troublesome "P" Traps
• The Air-Trap will never freeze and break
• No more issues caused by traps drying out
• Air-Trap is predesigned to prevent field errors
• Air-Trap reduces trap height by up to 60%
• Eliminates sludge build-up at bottom of “U” tube
• No more geysers when there is negative pressure
• Easy maintenance – use the side clips to open the Air-Trap for cleaning

•Perfect for Ductless Mini-splits

Condensate Drain Line and Condensate Trap Code Requirements as Outlined in the 2024 UMC (Uniform Mechanical Code) and 2021 IMC (International Mechanical Code) for Mini-split AC Equipment

2021 IMC Section 307.2.4.1 Ductless Mini-split system traps.  Ductless mini-split equipment that produces condensate shall be provided with an inline check valve in the drain line, or a trap. The DMS-Series Air-Trap by Des Champs Technologies is specifically designed to serve as the inline check valve/trap for use with mini-split condensate lines.

2024 UMC Section 310.4. Appliance Condensate Drains. (excerpt)

Condensate drain lines serving more than one appliance connecting to a common indirect waste pipe shall have the connections to the indirect waste pipe protected by a sanitary waste valve complying with ASME A112.18.8, condensate trap complying with IAPMO IGC 196, or trap with a trap primer.

When multiple mini-split units are used to air-condition a building such as a school, nursing home, or condominium it is common practice to run individual condensate drain lines into a larger central drainpipe system that carries the water to a final disposal area. If this situation exists, the 2024 UMC code requires that each individual appliance drain line be fitted with a device as stated in Section 310.4 between the appliance and the common indirect waste pipe. The intent is to prevent air passage between conditioned spaces. The DMS-Series Air-Trap meets the requirements of IAPMO IGC 196 and is designed for mini-splits, PTAC, and other fan-coil configurations.

DMS Operating Manual

ICC-ES Evaluated Click to view the PMG-1967 full report from ICC Evaluation Service, LLC	https://www.iapmomembership.org The Air-Trap™ concept has been incorporated into IAPMO IGC 196-2018 Standard for Condensate Traps and Overflow Switches for Air-Conditioning Systems.