508219-01
Issue 2132
Page 21 of 43
It is recommended that vertical suction risers not be up-
sized. Proper oil return to the compressor should be
maintained with suction gas velocity.
Filter Drier
The filter drier is very important for proper system operation
and reliability. If the drier is shipped loose, it must be
installed by the installer in the field. Unit warranty will be
void, if the drier is not installed.
Installation of Line Sets
DO NOT
fasten liquid or suction lines in direct contact with
the floor or ceiling joist. Use an insulated or suspension
type of hanger. Keep both lines separate, and always
insulate the suction line. Liquid line runs (30 feet or more)
in an attic will require insulation. Route refrigeration line
sets to minimize length.
DO NOT
let refrigerant lines come in direct contact with
foundation. When running refrigerant lines through the
foundation or wall, openings should allow for a sound
and vibration absorbing material to be placed or installed
between tubing and foundation. Any gap between
foundation or wall and refrigerant lines should be filled with
a vibration damping material.
If ANY refrigerant tubing is required to be buried by state
or local codes, provide a 6 inch vertical rise at service
valve.
CAUTION
Installation into an Existing R-22 System
If the unit will be installed in an existing system that uses
an indoor unit or line sets charged with R-22 refrigerant,
installer must perform the following procedures to convert
the system to an R-410A system.
Remove Existing Expansion Valve
1.
On fully cased coils, remove the coil access and
plumbing panels.
2.
Remove any shipping clamps from the liquid line and
distributor assembly.
3.
Disconnect the equalizer line from the check expansion
valve equalizer line fitting on the vapor line.
4.
Remove the vapor line sensing bulb.
5.
Disconnect the liquid line from the check expansion
valve at the liquid line assembly.
6. Disconnect the check expansion valve from the liquid
line orifice housing. Take care not to twist or damage
distributor tubes during this process.
7. Remove and discard check expansion valve and the
two Teflon® rings (see Figure 6).
8.
Use a field-provided fitting to temporarily reconnect the
liquid line to the indoor unit’s liquid line orifice housing.
SENSING
LINE
TWO-PIECE PATCH PLATE
(UNCASED COIL ONLY)
VAPOR
LINE
DISTRIBUTOR
ASSEMBLY
DISTRIBUTOR
TUBES
LIQUID
LINE
MALE EQUALIZER
LINE FITTING
EQUALIZER
LINE
EXPANSION
VALVE
TEFLON®
RING
STUB END
TEFLON
®
RING
SENSING BULB
LIQUID LINE
ORIFICE
HOUSING
LIQUID LINE
ASSEMBLY WITH
BRASS NUT
Figure 6. Remove Existing Expansion Valve
(uncased coil shown)
Flushing Line Sets
If the unit will be installed in an existing system that uses
an indoor unit or line sets charged with R-22 refrigerant,
installer must perform the following flushing procedure.
NOTE:
Existing system components (including line set
and indoor coil) must be an AHRI match with the unit in
order to fulfill unit warranty requirements.
Refrigerant must be reclaimed in accordance with
national and local codes.
WARNING
Do
NOT
attempt to flush and re-use existing line sets
or indoor coil when the system contains contaminants
(i.e., compressor burn out).
CAUTION
“Clean refrigerant” is any refrigerant in a system that
has not had compressor burnout. If the system has
experienced burnout, it is recommended that the
existing line set and indoor coil be replaced.
NOTE
In lieu of R-410A, an industry-standard flushing agent
may also be used.
NOTE
Summary of Contents for 4SCU14LB
Page 34: ...508219 01 Issue 2132 Page 34 of 43 Wiring Diagram Figure 13 A C Single Phase Wiring Diagram ...
Page 35: ...508219 01 Issue 2132 Page 35 of 43 Figure 14 A C Single Phase Wiring Diagram 59 model only ...
Page 36: ...508219 01 Issue 2132 Page 36 of 43 Figure 15 3 Phase 208 230 Volt ...
Page 37: ...508219 01 Issue 2132 Page 37 of 43 Figure 16 3 Phase 460 Volt ...
Page 41: ...508219 01 Issue 2132 Page 41 of 43 Charge Labels Figure 17 4SCU16LE 4SCU14LB 50 ...
Page 42: ...508219 01 Issue 2132 Page 42 of 43 Figure 18 4SCU14LE LB 4 thru 7 ...
