Page 4
Installer’s Information Manual
A minimum clearance of 18 inches is required for service at
the control panel access. A 12 inch clearance is required
for the air inlet to the outdoor coil around the perimeter of
the unit. The air discharge of the unit requires a 60 inch
clearance between the top of the unit and any obstruction.
See Figure 2.
The length of the refrigerant tubing, between the outdoor
unit and indoor coil, should be as short as possible to avoid
capacity and efficiency loss. Excessive spacing of the
outdoor unit from the home can lead to the refrigerant lines
being restricted by trampling or by being punctured by lawn
mowers. Locate the outdoor unit away from bedroom
windows or other rooms where sound might not be
desirable.
Provide sufficient clearance from shrubs to allow adequate
air to pass across the outdoor coil without leaves or
branches being pulled into the coil.
Consideration should be given to the distance and routing
of electrical service that would have to be run to connect
the outdoor unit.
The outdoor unit may be installed at ground level on a solid
base that will not shift or settle, causing strain on the
refrigerant lines and possible leaks. Isolate the base from
the structure to avoid noise or vibration transmission.
When installing units on a roof, a structure should be used
to minimize the transmission of sound or vibration into the
conditioned space. Thought should be given to water
drainage away from the outdoor unit. Drain holes in the
base pan must be kept clear.
12" Clearance
around unit
18" Clearance
for Service Area
60" Clearance
Above Unit
To Indoor Coil
NEC Class 1
Wiring
Power
Supply
NEC Class 2
Wiring
Thermostat
To Indoor Air Handler
or Furnace
Figure 2. Typical Location and Clearances
SECTION 4. REFRIGERANT PIPING
CONNECTIONS
Undersized line sets will increase the refrigerant pressure
drop between the indoor evaporator and outdoor unit,
resulting in a decrease in system capacity. Over sizing the
line sets may result in excessive refrigerant charge, thereby
making the system more susceptible to liquid migration.
Slope horizontal vapor lines at least 1” every 20 feet toward
the outdoor unit to facilitate proper oil return.
Use only refrigerant grade (dehydrated and sealed) copper
tubing of the size indicated in Table 1 to interconnect the
condensing unit with the indoor evaporator. Take extreme
care to keep the refrigerant tubing clean and dry prior to
and during installation. All outdoor unit and evaporator coil
connections are copper to copper and should be brazed
with a phosphorous-copper alloy material such as Silfos-5
or equivalent instead of soft solder. The outdoor units have
re-usable service valves on both the liquid and vapor
connections. Precautions should be taken to prevent heat
damage to the valve by wrapping a wet rag around it when
brazing.
Do not remove plugs from ends of tubing until connection is
ready to be made. Suction line insulation is necessary to
prevent condensation from forming on and dropping from
suction line. Apply suction line insulation by sliding it on the
sealed tubing before cutting and making connections. See
Table 1 for correct vapor line size.