EMI CAC manual Correct Incorrect, Condensate Piping

CONDENSATE PIPING

The unit can now be piped up in accor- dance with good refrigeration and/or plumbing practices.

The Cassette is supplied with a 1/2” I.D. fl exible PVC hose for connection to copper or plastic drain pipework. When installing the Cassette the following points should be remembered:

1.Maximum pump lift is 36”.

2.The highest point in the condensate pipework should be as close to the unit as possible. This prevents a large volume of water draining back into the unit when it is switched off.

NOTE: There is a check valve at the pump discharge to prevent water from draining back into the unit. This piping technique will minimize any is- sues should the check valve become stuck open from airborne debris.

Duct collars: Branch duct and fresh air duct collars can be attached to the Cas- sette chassis by following the steps below:

Condensate Drain Connection

1.Locating the knock-out holes.

Branch Duct Knockout

Correct

Incorrect

3.Condensate pipework should slope downwards in the direction of water fl ow with a minimum gradient of (1” per 10’). There must not be any uphill gradients other than in the fi rst 36” of pipework from the Cassette.

4.When multiple Cassettes are connect- ed to a common condensate drain, ensure the drain is large enough to handle the volume of condensate from several Cassettes. It is also rec- ommended to have an air vent in the condensate pipe work to prevent any air locks.

Small Unit

Medium &

Large Units

Fresh Air

Knockout

Notes: The number of knock-outs var- ies depending on unit size.

•Branch duct knock-outs are 5¼” round

•Fresh air knock-outs are 1¼” x 2½” rectangular on 12k, and 3” square on 24-36k

Recommendation: No more then 10’ of branch duct or fresh air duct should be installed.

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