Johnson Controls Unitary Products
5284792-UIM-A-0317
R-410A VARIABLE CAPACITY
OUTDOOR SPLIT-SYSTEM
AIR CONDITIONING
MODELS: 20 SEER
YXV, AC21, AL21 SERIES
2 – 5 TONS – 1 PHASE
INSTALLATION MANUAL
®
®
LIST OF SECTIONS
GENERAL . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .1
SAFETY . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .1
UNIT INSTALLATION . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .2
EVACUATION . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .6
ELECTRICAL CONNECTIONS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .6
SYSTEM CHARGE . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .8
SYSTEM OPERATION . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9
OUTDOOR SCREEN OPERATION . . . . . . . . . . . . . . . . . . . . . . . . . 11
INSTRUCTING THE OWNER . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 19
WIRING DIAGRAM . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 20
START UP SHEET . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 22
LIST OF FIGURES
Typical Installation Clearances . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .3
Alternative Installation Clearances . . . . . . . . . . . . . . . . . . . . . . . . . . . .3
Installation of Vapor Line . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .5
Underground Installation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .5
Heat Protection . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .5
Outdoor Unit Control Box . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .7
Typical Communicating Field Wiring (Air Handler / Furnace) . . . . . . .7
Demand Response Wiring . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .8
System Charging Connections . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8
Main Outdoor Control and Display . . . . . . . . . . . . . . . . . . . . . . . . . . . 9
Outdoor Display . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11
2 Ton Inverter Drive LED Location . . . . . . . . . . . . . . . . . . . . . . . . . . 16
3 & 4 Ton Inverter Drive LED Location . . . . . . . . . . . . . . . . . . . . . . . 16
5 Ton Inverter Drive LED Location . . . . . . . . . . . . . . . . . . . . . . . . . . 16
Wiring Diagram - 2 Ton . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 20
Wiring Diagram - 3-5 Ton . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 21
LIST OF TABLES
Minimum / Maximum Operating Limit Conditions . . . . . . . . . . . . . . . . .2
Allowable Vertical Linesets. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .2
TEST Mode Option . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .10
Same Priority Fault Storage . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .10
Status Code Display . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .10
Outdoor Display Menu Structure . . . . . . . . . . . . . . . . . . . . . . . . . . . .12
Outdoor Control Faults/Status Code Display . . . . . . . . . . . . . . . . . . 13
Inverter Drive Fault/Status Code Display . . . . . . . . . . . . . . . . . . . . . 15
Troubleshooting – Fault and Protection Table . . . . . . . . . . . . . . . . . 18
Sensor Connector Pin Definition . . . . . . . . . . . . . . . . . . . . . . . . . . . . 19
Low Suction Pressure Limits . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 19
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.
CAUTION
The EEV is factory installed but shipped in the closed position.
Prior to any brazing, power must be applied to the Indoor Unit. If
installing a coil furnace match or multi-piece air handler system,
the EEV harness must be plugged into the Comm port prior to
applying power to the indoor unit. Allow
1 minute
for the EEV to
open to allow proper nitrogen flow through the coil and lineset.
!
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 mainte-
nance can cause injury or property damage. Refer to this manual
for assistance or for additional information, consult a qualified con-
tractor, 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.
!
!
