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INSTALLER'S GUIDE

bASEPAN TAb REMovAL

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.

LIQUID LINE SERvIcE vALvE

PAGE 2

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:

▲

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:

▲

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.

If using existing refrigerant lines

In scroll compressor applications,

Pub. No. 11-BC08D1-7