Step 2 - Installation Guide; Installation Guide Setup; Step 3 - Condensate Piping; Step 4 - Duct Collars - Carrier AirStream 42WKN08-36 Installation, Operation And Maintenance Instructions

42WKN
UNIT SIZE
A
08,12 19-1/2 (49.5 cm)
18,20 28-1/2 (72.4 cm)
33,36 28-1/2 (72.4 cm)
Fig. 38 — Hanger Bolt Mounting Dimensions
Step 2 — Installation Guide
An installation guide is included in the Carrier Owner Information
packet provided with the unit. Prepare the installation guide by
folding the flat metal piece, by hand, along the perforations as
shown in Fig. 39.

INSTALLATION GUIDE SETUP

Use an adequate number of personnel when moving the unit. A
lifting device or at least two personnel should be used to lift the
unit. The unit can be lifted onto the hanging rods and leveled at the
correct distance from the ceiling with the aid of the installation
guide.
1. Hold the tab on the installation guide against the bottom of
the cassette case with the guide pointing away from the cas-
sette. See Fig. 40. Adjust the height of the cassette until the
guide is level with the bottom of the false ceiling.
2. Secure the unit in position with locknuts and washers on
both sides of the unit bracket. Ensure the threaded rod
does not protrude more than 2 in. (5 cm) below the mount-
ing bracket as shown in Fig. 41.
Fig. 39 — Setting Up Installation Guide
Fig. 40 — Positioning Installation Guide
DIMENSIONS (in.)
B
23 (58.4 cm)
31-1/2 (80.0 cm)
43-1/2 (110.5 cm)
Fig. 41 — Threaded Rod Dimension
Step 3 — Condensate Piping
The unit is supplied with a 3/8 in. ID flexible hose for connection
to copper or plastic drain piping.
When installing the unit, the following points should be
remembered:
1. Maximum pump lift is 30 inches (76.2 cm).
2. The highest point in the condensate piping should be as
close to the unit as possible.
3. Condensate piping should slope downwards in the direc-
tion of water flow with a minimum gradient of 1 inch in
100 inches (2.54 cm per 254 cm). There must not be any
uphill gradients other than in the first 30 in. (76.2 cm) of
piping from the unit. Once the piping begins the down-
ward gradient, the piping must continue to be in a down-
ward gradient. See Fig. 42.
4. When multiple units are connected to a common conden-
sate drain, ensure the drain is large enough to cope with
the volume of condensate from all units. It is also recom-
mended to have an air vent in the condensate piping to
prevent any air locks.
5. Condensate piping must not be installed where it may be
exposed to freezing temperatures.
30 in
(76.2 cm)
Max
Fig. 42 — Condensate Piping
Step 4 — Duct Collars

DUCT COLLARS

Supply air branch duct and outside air duct collars can be attached
to the unit chassis by following the below steps:

SUPPLY AIR DUCT COLLARS

1. Up to two supply air ducts can be attached per unit.
2. Place the polystyrene blanking strip in the fascia supply air
opening on the same side where the supply duct collar is to be
installed.

OUTSIDE AIR DUCT COLLARS

1. Two outside air openings are available on small casing sizes
(size 08 and 12). Three outside air openings are available on
medium and large casing sizes (size 18 and higher).
2. Replace the washable filter with the pleated filter provided
with the fresh air duct collar kit.
3. To maximize the amount of outside air through the knock-
outs, use all available fresh air openings, the pleated filter,
and high fan speed.
43
THREADED ROD < 2 in. ( 5 cm)