Johnson Controls Unitary Products
5390862-UIM-A-0318
R-410A 2-STAGE OUTDOOR
SPLIT-SYSTEM AIR CONDITIONING
MODELS: 19 SEER
YXT, AC19B, AL19B SERIES
2 – 5 TONS – 1 PHASE
INSTALLATION MANUAL
®
LIST OF SECTIONS
GENERAL . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .1
SAFETY . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .1
UNIT INSTALLATION . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .3
COIL METERING DEVICES . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .7
EVACUATION . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .8
SYSTEM CHARGE . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8
ELECTRICAL CONNECTIONS . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11
INSTRUCTING THE OWNER . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 23
WIRING DIAGRAM . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 24
START UP SHEET . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 25
LIST OF FIGURES
Typical Installation Clearances . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .3
Alternative Installation Clearances . . . . . . . . . . . . . . . . . . . . . . . . . . . .3
Insulation of Vapor Line . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .5
Underground Installation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .5
Heat Protection . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .5
TXV Installation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .6
TXV Bulb and Equalizer line Installations . . . . . . . . . . . . . . . . . . . . . .7
Proper Bulb Location . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .7
Vertical Temperature Bulb Orientation . . . . . . . . . . . . . . . . . . . . . . . . .7
System Charging Connections . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .9
Outdoor Unit Control Box . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .10
Typical 2-Stage Conventional Field Wiring - AC . . . . . . . . . . . . . . . .11
Demand Response Wiring . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12
Communicating AC with Communicating Air Handler or Furnace . . 12
Communicating AC with Non-Communicating Air Handler
or Furnace using Communicating Interface Control . . . . . . . . . . . . . 12
Thermostat Chart - Two Stage AC –
Two Stage Variable Speed Furnaces . . . . . . . . . . . . . . . . . . . . . . . . 13
Thermostat Chart - Two Stage AC –
Two Stage Variable Speed Furnaces . . . . . . . . . . . . . . . . . . . . . . . . 14
Thermostat Chart - Two Stage AC – Variable Speed Furnaces . . . . 15
Thermostat Chart - Two Stage AC – Variable Speed Furnaces . . . . 16
Thermostat Chart - Two Stage AC – Variable Speed Furnaces . . . . 17
Thermostat Chart - Two Stage AC – Variable Speed Furnaces . . . . 18
Wiring Diagram . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 22
LIST OF TABLES
Minimum / Maximum Operating Limit Conditions . . . . . . . . . . . . . . . . .3
Allowable Vertical Linesets . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .3
R-410A Saturation Properties . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .10
R-410A Saturation Properties . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11
Status code . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 21
Fault Code . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 22
SECTION I: GENERAL
The outdoor units are designed to be connected to a matching indoor
coil with sweat connect lines. Sweat connect units are factory charged
with refrigerant for a nominal sized matching indoor coil plus 15 feet of
field-supplied lines.
SECTION II: SAFETY
This is a safety alert symbol. When you see this symbol on
labels or in manuals, be alert to the potential for personal
injury.
Understand and pay particular attention to the signal words
DANGER
,
WARNING
, or
CAUTION
.
DANGER
indicates an
imminently
hazardous situation, which, if not
avoided,
will result in death or serious injury
.
WARNING
indicates a
potentially
hazardous situation, which, if not
avoided,
could result in death or serious injury
.
CAUTION
indicates a potentially hazardous situation, which, if not
avoided
may result in minor or moderate injury
. It is also used to
alert against unsafe practices and hazards involving only property dam-
age.
IMPORTANT
It is recommended before starting the system to connect the
thermostat to Wi-Fi using a local network or portable hot-spot
so the thermostat and system receive the latest software
updates to optimize system performance only if using this in
communicating configuration. This notice does not apply to
conventionally wired equipment.
WARNING
Improper installation may create a condition where the operation of
the product could cause personal injury or property damage.
Improper installation, adjustment, alteration, service or maintenance
can cause injury or property damage. Refer to this manual for assis-
tance or for additional information, consult a qualified contractor,
installer or service agency.
CAUTION
This product must be installed in strict compliance with the enclosed
installation instructions and any applicable local, state, and national
codes including, but not limited to building, electrical, and mechanical
codes.
CAUTION
R-410A systems operate at higher pressures than R-22 systems. Do
not use R-22 service equipment or components on R-410A equip-
ment. Service equipment
Must Be Rated
for R-410A.
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