Installer's Guide - American Standard 4A7A5 Installer's Manual

INSTALLER'S GUIDE

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BASEPAN TAB REMOVAL
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 run-off 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
recommended 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.
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LIQUID LINE SERVICE VALVE
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If using existing refrigerant lines
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
compressor, may cause minor to severe burning.
The units are factory charged with the system charge required
when using fifteen (15) feet of rated connecting line. Unit
nameplate charge is with twenty-five (25) feet of line set.
Final refrigerant charge adjustment is necessary. Use the
Charging Information on Page 6 or in the unit Service Facts.
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.
7. Route the tubing making all required bends and properly
secure the tubing before making connections.
8. To prevent a noise within the building structure due to
vibration transmission from the refrigerant lines, the following
precautions should be taken:
a. When the refrigerant lines have to be fastened to floor
joists or other framing in a structure, use isolation type hangers.
b. Isolation hangers should also be used when refrigerant
lines are run in stud spaces or enclosed ceilings.
c. Where the refrigerant lines run through a wall or sill, they
should be insulated and isolated.
d. Isolate the lines from all ductwork.
D. SERVICE VALVE OPERATION
BRASS LIQUID AND GAS LINE SERVICE VALVES
The Brass Liquid and Gas Line Service Valves are factory shipped
in the seated position to hold factory charge. The pressure tap
service port (when depressed) opens only to the field brazing side
of the valve when the valve is in the seated position. The liquid
line valve is not a back seating valve (see WARNING below).
WARNING:
exercised when opening the Liquid and Gas Line Service
Valves. Turn valve stem counterclockwise only until the
stem contacts the rolled edge. (See Figures 3 and 5.) No
torque is required. Failure to follow this warning will result
in abrupt release of system charge and may result in per-
sonal injury and/or property damage.
In scroll compressor applications,
Extreme caution should be
Pub. No. 11-AC24D1-1