GSZC18 Installation

2
T HIS UNIT IS EQUIPPED WITH A 24 VAC TRANSFORMER THAT POWERS
THE HEAT PUMP CONTROL BOARD . W HEN INSTALLED AS A
COMMUNICATING SYSTEM , ONLY 2 WIRES ARE NEEDED BETWEEN
INDOOR AND OUTDOOR EQUIPMENT . H OWEVER , WHEN INSTALLED AS
A NON - COMMUNICATING ( LEGACY ) SYSTEM , THE TRANSFORMER
WIRING ( LOW VOLTAGE AND LINE VOLTAGE ) MUST BE DISCONNECTED .
R
EFER TO THE LOW VOLTAGE WIRING SECTION FOR MORE DETAILS .
NOTICE
Should you have any questions please contact the local office of
the EPA.
If replacing a condensing unit or air handler, the system must be
manufacturer approved and Air Conditioning, Heating and Re-
frigeration Institute (AHRI) matched. NOTE: Installation of un-
matched systems is strongly discouraged.
Outdoor units are approved for operation above 55°F in cooling
mode. Operation below 55°F in cooling mode requires the use
of an approved low ambient kit.
Damage to the unit caused by operating the unit in a structure
that is not complete (either as part of new construction or reno-
vation) is not covered by the warranty.
F EATURES
This heat pump is a part of the ComfortNet™ family of products
and may be installed as part of a digitally communicating sys-
tem. The ComfortNet system provides enhanced setup features,
and enhanced diagnostics. It also reduces the number of ther-
mostat wires to a maximum of four and a minimum of two. This
heat pump may also be installed as part of a “legacy” system
using a standard 24 VAC thermostat.
I NSTALLATION C LEARANCES
Special consideration must be given to location of the condens-
ing unit(s) in regard to structures, obstructions, other units, and
any/all other factors that may interfere with air circulation.
Where possible, the top of the unit should be completely unob-
structed; however, if vertical conditions require placement be-
neath an obstruction there should be a minimum of 60 inches
between the top of the unit and the obstruction(s). The speci-
fied dimensions meet requirements for air circulation only. Con-
sult all appropriate regulatory codes prior to determining final
clearances.
Another important consideration in selecting a location for the
unit(s) is the angle to obstructions. Either side adjacent the valves
can be placed toward the structure provided the side away from
the structure maintains minimum service clearance. Corner in-
stallations are strongly discouraged.
OK!
OK!
AA AAA
A
CC
C
C
OK!
OK!
OK!
OK!
NOT
RECOMMENDED
AA
AA
AA
AA
AA
B B B
B
Model Type A B C AA
Residential 10" 10" 18" 20"
Light Commercial 12" 12" 18" 24"
Minimum Airflow Clearance
This unit can be located at ground floor level or on flat roofs. At
ground floor level, the unit must be on a solid, level foundation
that will not shift or settle. To reduce the possibility of sound
transmission, the foundation slab should not be in contact with
or be an integral part of the building foundation. Ensure the foun-
dation is sufficient to support the unit. A concrete slab raised
above ground level provides a suitable base.
R OOFTOP I NSTALLATIONS
If it is necessary to install this unit on a roof structure, ensure
the roof structure can support the weight and that proper con-
sideration is given to the weather-tight integrity of the roof. Since
the unit can vibrate during operation, sound vibration transmis-
sion should be considered when installing the unit. Vibration ab-
sorbing pads or springs can be installed between the con-densing
unit legs or frame and the roof mounting assembly to reduce
noise vibration.
NOTE: These units require special location consideration in areas
of heavy snow accumulation and/or areas with prolonged
continuous subfreezing temperatures. Heat pump unit bases
have cutouts under the outdoor coil that permit drainage of frost
accumulation. Situate the unit to permit free unobstructed
drainage of the defrost water and ice. A minimum 3” clearance
under the outdoor coil is required in the milder climates.
In more severe weather locations, it is recommended that the
unit be elevated to allow unobstructed drainage and air flow.
The elevation minimums at right are recommended: