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A 7 Air Handling Unit Cond Traps

The document provides a technical policy statement regarding condensate traps for air handling unit cooling coils. It states that many existing traps are inadequate due to the unit not being located on a suitable base, making the trap height too low and allowing the water seal to be pulled out by fan pressure. The preferred solution is to install all air handling units on plinths at least 100mm high and fit each cooling coil with a copper p-trap configured to maintain enough water to overcome fan outlet pressure.

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81 views3 pages

A 7 Air Handling Unit Cond Traps

The document provides a technical policy statement regarding condensate traps for air handling unit cooling coils. It states that many existing traps are inadequate due to the unit not being located on a suitable base, making the trap height too low and allowing the water seal to be pulled out by fan pressure. The preferred solution is to install all air handling units on plinths at least 100mm high and fit each cooling coil with a copper p-trap configured to maintain enough water to overcome fan outlet pressure.

Uploaded by

asdthu
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© © All Rights Reserved
We take content rights seriously. If you suspect this is your content, claim it here.
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Technical Policy Statement

Air Handling Unit


Condensate Traps
Ref . A7

August 2006
Prepared by: Engineering Team
Endorsed by: Steve Howe Director of Building Projects
Nick Roalfe Director of Facilities Management

Support Services
Engineering Team

Technical Policy Statement - Air Handling Unit Condensate


Traps

Introduction
It has been found that in many cases, condensate traps serving cooling coils
on air handling units are inadequate.
It is often the case that the air handling unit has not been located on a suitable
base or set of plinths and the condensate trap is of insufficient height to be
effective. Consequently, with the height of the trap being too low, the water
seal would be pulled out under the influence of the fan pressure.

Preferred Solution
In order to alleviate the problem of insufficient trap height and pulling of the
water seal, the following measures shall be adopted:-

a) Ensure that air handling units that are installed in plantrooms/roof plant
areas are located on concrete/steel plinths to a minimum height of
100mm.
b) Install a trap at the cooling coil condensate drain point of each air
handling unit. The trap shall be constructed from copper pipe and
fittings consisting of two tees and removable plugs for inspection,
cleaning and, if necessary, priming. The trap shall be configured to
maintain a suitable water column that will overcome the fan outlet
pressure. (Please refer to attached sketch).

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