Condensate Drain; Duct System; Air Ducts; Piping - Carrier GC Series Installation Instructions Manual

CONDENSATE DRAIN

IMPORTANT: This connection must be in conformance with
local plumbing codes. A trap must be installed in the
condensate line to insure free condensate flow. Units are NOT
internally trapped or sloped for condensate drain.
IMPORTANT: Condensate piping must be pitched toward the
drain 1/8" per foot.
NOTE: The condensate drain outlet on the cabinet is on a low
point of the cabinet so additional height may need to be considered
on unit base pad to allow for proper drain trap and slope.
Fig. 5 - - Condensate Drain
A vertical air vent is sometimes required to avoid air pockets. The
length of the trap depends on the amount of positive or negative
pressure on the drain pan. A second trap must not be included.
Unit condensate drain connection may spin freely. Use backup
wrench to hold fitting in place while connecting external piping.

DUCT SYSTEM

A supply air outlet collar and return air duct flange are provided on
all units to facilitate duct connections.
NOTE: Supply air duct and return air duct flanges are shipped
unfolded with unit.
Fold the duct flange outwards along the perforated line. Refer to
unit Dimensional Drawings for physical dimensions of the collar
and flange.
A flexible connector is recommended for supply and return air duct
connections on metal duct systems. All metal ducting should be
insulated with a minimum of one inch duct insulation to avoid heat
loss or gain and prevent condensate from forming during the
cooling operation.
Application of the unit to uninsulated duct work is not
recommended as the unit's performance will be adversely affected.
CAUTION
!
UNIT OPERATION HAZARD
Failure to follow this caution may result in improper
equipment operation.
Do not connect discharge ducts directly to the blower
outlet.
The factory provided air filter must be removed when using a filter
back return air grill. The factory filter should be left in place on a
free return or standard ducted system.
If the unit will be installed in a new installation which includes new
duct work, the installation should be designed using current Air
Conditioning Contractors of America (ACCA), North American
Technician Excellence (NATE), or other applicable standards for
duct sizing.
If the unit is to be connected to existing duct work, a check should
be made to assure that the duct system has the capacity to handle
the air required for the unit application.
If the duct system is too small, larger duct work should be installed.
Check for existing leaks and repair.
The duct system and all diffusers should be sized to handle the
designed air flow quietly. To maximize sound attenuation of the
unit blower, the supply and return air plenums should be insulated.
There should be no direct straight air path through the return air
grille into the heat pump. The return air inlet to the heat pump must
have at least one 90 degree turn away from the space return air
grille. If air noise or excessive air flow are a problem, the blower
speed can be changed to a lower speed to reduce air flow.

Air Ducts

Connect supply- -air duct over outside of 3/4- -in. flange provided
on supply- -air opening. Secure duct to flange with proper fasteners
for type of duct used, and seal duct- -to- -unit joint.
Duct connection flanges are provided on unit air discharge
connection.
Use flexible connectors between ductwork and unit to prevent
transmission of vibration. When electric heater is installed, use heat
resistant material for flexible connector between ductwork and unit
at discharge connection. Ductwork passing through unconditioned
space must be insulated and covered with vapor barrier.
Ductwork Acoustical Treatment
Metal duct systems that do not have a 90_elbow and 10 ft. of main
duct to first branch takeoff may require internal acoustical
A14118
insulation lining. As an alternative, fibrous ductwork may be used
if constructed and installed in accordance with the latest edition of
SMACNA construction standard on fibrous glass ducts. Both
acoustical lining and fibrous ductwork shall comply with National
Fire Protection Association Standards 90A or B as tested by UL
Standard 181 for Class 1 air ducts.
Supply and return piping must be as large as the unit connections
on the heat pump (larger on long runs).
!
UNIT OPERATION HAZARD
Failure to follow this caution may result in improper
equipment operation.
Never use flexible hoses of a smaller inside diameter than
that of the fluid connections on the unit.
GC units are supplied with either a copper or optional cupronickel
condenser.
NOTE: Proper testing is recommended to assure the well water
quality is suitable for use with water source equipment. When in
doubt, use cupronickel. See Application Considerations notes on
page 3.
In conditions anticipating moderate scale formation or in brackish
water, a cupronickel heat exchanger is recommended.
Both the supply and discharge water lines will sweat if subjected to
low water temperature. These lines should be insulated to prevent
damage from condensation. All manual flow valves used in the
system must be ball valves. Globe and gate valves must not be
used due to high pressure drop and poor throttling characteristics.
!
EQUIPMENT
OPERATION HAZARD
Failure to follow this caution may result in equipment
damage and/or improper operation.
Never exceed the recommended water flow rates as serious
damage or erosion of the water- -to- -refrigerant heat
exchanger could occur.
7

PIPING

CAUTION
CAUTION
DAMAGE AND/OR UNIT