Carrier 48KHA - Manual (Page 3)

A CAUTION
Do not restrict condenser airflow. An air restriction at
either outdoor-edr inlet (the entire surface of the outdoor
coil) or fan discharge can be detrimental to compressor
life.
Condenser fan discharges through top of unit. Ensure that
fan discharge does not recirculate to condenser coil. Do not
locate unit in either a corner or under a complete overhead
obstruction. Minimum clearance under a partial overhang
(such as a typical house roof overhang) is 3 ft above vent
cap. Maximum horizontal extension of a partial overhang
must not exceed 4 feet.
Do not locate unit where water, falling ice or snow from an
overhang or roof will damage or flood the unit. Do not locate
unit where grass, shrubs, or other plants will interfere with
the airflow either into or out of unit. Do not install unit on
carpeting, tile or other combustible material other than
wood flooring.
CONDENSATE DISPOSAL
NOTE: Be sure condensate water disposed methods comply
with local codes, restrictions and practices.
Models 48KHA,KLA dispose of condensate water through
a %-in. MPT drain fitting. See Fig. 4 for location.
Install a 3-in. trap at the drain fitting to ensure proper
drainage. See Fig. 3. Make sure trap outlet is at least 2 in.
lower than unit dredn pan connection to prevent pan from
overflowing. Prime trap with water.
TO DRAIN
If installation requires draining the condensate water away
from unit, connect a dredn tube using a minimum of 7s-in. OD
copper tubing, %-in. galvanized pipe or 7s-in. plastic pipe. Do
not undersize the tube. Pitch drain tube downward at a
slope at least one in. for every 10 ft of horizontal run. Be
sure to check drain tube for leaks.
Condensate water can be drained directly onto roof in roof­
top installations (where permitted) or onto a gravel apron in
ground level installations. When using a gravel apron, make
sure it slopes away from the unit.
VENTING—The vent cap, combustion air shroud and flue
assembly are shipped in either the blower or control com­
partment. Vent screen is taped to blower housing. Remove
access doors to locate assemblies. See Fig. 4 for door
locations.
A CAUTION
Venting system is designed to ensure proper venting.
Vent cap assembly must be installed as indicated
below.
Fig. 3—Condensate Trap
NOTE: Screw holes in flue assembly and unit top eire posi­
tioned to ensure proper orientation when installed. Refer to
Fig. 5 emd instedl vent cap as follows:
1. Place combustion air shroud over combustion air open­
ing in unit top, and line up screw holes in shroud with
holes in top. Secure shroud to top, using screws with
rubber washers (provided).
2. The flue gasket is shipped in the literature assembly
envelope. Place gasket and flue assembly through hole
in combustion air shroud, orient screw holes in base of
flue assembly with holes in unit top, and secure gasket
and flue assembly to unit top, using screws provided.
3. Form flat wire screen (provided) into circular shape
around protruding lip of combustion-air shroud and
bend wire ends through holes of screen mesh to secure
screen in place. Make sure that no sharp edges are left
exposed.
4. Place vent cap sleeve inside flue assembly. Orient
spring chp of vent cap with slot in assembly. Be sure
clip snaps into slot to secure clip onto assembly.