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9
CAC Cassette Evaporator
Fresh Air
Knockout
F
resh
Fresh F
K
nockout
KnockoutK
Branch Duct Knockout
Small Unit
Medium &
Large Units
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.
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.
Correct
Incorrect
Condensate Drain Connection
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.
Duct collars: Branch duct and fresh air
duct collars can be attached to the Cas-
sette chassis by following the steps below:
1. Locating the knock-out holes.