PAGE 2
Pub. No. 11-BC08D1-7
INSTALLER'S GUIDE
It is recommended that these precautions be taken for
units being installed in areas where snow accumulation
and prolonged below freezing temperatures occur.
1.
Units should be elevated 3 to 12 inches above the pad or
rooftop, depending on local weather. This additional height will
allow better drainage of snow and ice (melted during defrost
cycle) prior to its refreezing.
This should prevent a buildup of
ice around the unit which occurs when unit is not elevated.
Insure that drain holes in unit base pan are not obstructed
preventing draining of defrost water.
2. If possible, avoid locations that are likely to accumulate snow
drifts. If not possible, a snow drift barrier should be installed
around the unit to prevent a buildup of snow on the sides of the
unit and should be of sufficient distance from the unit to prevent
restriction of airflow to and from the unit. Also allow for proper
maintenance space. The barrier should be constructed of materi-
als which will blend in with the building design.
3. Avoid locating the unit where condensation and freezing of
defrost vapor may annoy the customer. For instance, installing
the unit under a bedroom, kitchen, or picture window may be
annoying to the customer since condensate and fog will occur
during the defrost cycle.
4. Avoid locating the unit under the eaves or other overhead
structures as sizeable icicles may form and the unit may be
damaged by these falling icicles.
B. LOCATION AND PrEPArATION OF ThE UNIT
1. When removing unit from the pallet, notice the tabs on the
basepan. Remove tabs by cutting with a sharp tool as shown on
page 2, Figure 2, and slide unit off of pallet.
2. The unit should be set on a level support pad at least as large
as the unit base pan, such as a concrete slab. If this is not the
application used please refer to application bulletin AMSSP-
APG002-EN.
3. The support pad must NOT be in direct contact with any
structure. Unit must be positioned a minimum of 12" from any
wall or surrounding shrubbery to insure adequate airflow. Clear-
ance must be provided in front of control box (access panels) &
any other side requiring service access to meet National Electri-
cal Code. Also, the unit location must be far enough away from
any structure to prevent excess roof runoff water from pouring
directly on the unit. Do not locate unit(s) close to bedroom(s).
4. The top discharge area must be unrestricted for at least five (5)
feet above the unit.
5. When the outdoor unit is mounted on a roof, be sure the roof
will support the unit’s weight. Properly selected isolation is rec-
ommended to prevent transmission to the building structure.
6. The maximum length of refrigerant lines from outdoor to
indoor unit should NOT exceed sixty (60) feet.
7. If outdoor unit is mounted above the air handler, maximum
lift should not exceed sixty (60) feet (suction line). If air handler
is mounted above condensing unit, maximum lift should not
exceed sixty (60) feet (liquid line).
8. Locate and install indoor coil or air handler in accordance
with instruction included with that unit.
C. INSTALLING rEFrIGErANT LINES
▲
cAUTIoN:
If using existing refrigerant lines
make certain that all joints are brazed, not soldered.
Condensing units have provisions for braze connections.
Pressure taps are provided on the service valves of outdoor unit
for compressor suction and liquid pressures.
The indoor end of the recommended refrigerant line sets may
be straight or with a 90 degree bend, depending upon situation
requirements. This should be thoroughly checked out before
ordering refrigerant line sets.
The gas line must always be insulated.
▲
cAUTIoN:
In scroll compressor applications,
dome temperatures may be hot. Do not touch top of com-
pressor, may cause minor to severe burning.
The units are factory charged with the system charge required
when using fifteen (15) feet of connecting line. Unit nameplate
charge is the same.
Final refrigerant charge adjustment is necessary.
Use
the Charging Information in the outdoor unit Service Facts or
on page 6.
1. Determine the most practical way to run the lines.
2. Consider types of bends to be made and space limitations.
NOTE: Large diameter tubing will be very difficult to rebend
once it has been shaped.
3. Determine the best starting point for routing the refrigerant
tubing — INSIDE OR OUTSIDE THE STRUCTURE.
4. Provide a pull-thru hole of sufficient size to allow both liquid
and gas lines.
5. Be sure the tubing is of sufficient length.
6. Uncoil the tubing — do not kink or dent.
bASEPAN TAb REMovAL
2
3
LIQUID LINE SERvIcE vALvE
