28GH
Carrier
Instaliation instructions
Direct Expansion Evaporator Coil
GENERAL
These encased coils must be used in a hori
zontal position with the air flow in the direction as
indicated in Fig. 1.
Transportation Damage — If any damage is noted
when unpacking coil, file a claim with the trans
portation agency.
NIPPLE AUXILIARY
CONDENSATE CONN
28GH002,003
INSTALLATION
Install coil in the horizontal run of a supply air
duct from any furnace. Fig. 2 shows typical
installations. Attach ductwork to encased coil. Use
straps for hanging. Do not drill or screw into coil
condensate pan. Coil must be level for proper
condensate drainage.
If the duct cross-sectional area between coil and
furnace is smaller than entering air opening of
encased coil, a transition must be made in the duct.
The ratio of transition in the duct must not exceed
more than one inch for every seven in both the
horizontal and vertical planes.
Where it is necessary to reduce fan noise or
vibration, install a canvas connection in the duct
work on the entering air side of the coil.
When encased coil is installed in a crawl space,
attic or basement with less than 18 in. service
clearance above the unit, it is not possible to
service unit thru the access panel. In these cases,
part of the ductwork must be cut away or unit
must be removed from duct for servicing.
UNIT 28GH 002 003 i 004 i 005 006
DIM. (fi-in.)
CONN, (in, ODF)
Suction
Liquid
Condensate
Duct iniet (in.)
Duct Outlet (in.)
A
s I
C i
D j
V,
E i
F i
G ;
K i 14%
J i
K j __14%
i 2-G%l 2-4% 3-0%
1-3%
1 -4%
V
%
7/
/A
13%
22% i 26%
13% i
13%
18% i
22% i 26%
Fig. 1 — Dimensions
©Carrier Corporation 1969
1%
%
34%
34%
Fig. 2 — Typical Installation
Refrigerant Piping — Connection sizes are given in
Fig. I.
COILS 002 THRU 005 use Carrier Compatible
Fittings and accessory tubing package for connec
tions. Detailed instructions are included with the
tubing package. Do not remove rubber plugs from
Carrier Compatible Fittings on the coil until ready
to connect the suction or liquid line into the
fitting. If coil piping is left open, vapor holding
charge will escape and allow moisture to enter.
Form 28GH-1SI
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