Armstrong Air 4SCU 16 LS Series User manual

507607-03 Issue 1827 Page 1 of 23
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INSTALLATION INSTRUCTIONS
4SCU 16 LS SERIES
Split System Air Conditioner
(P) 507607-03
*P507607-03*
Manufactured By
Allied Air Enterprises LLC
A Lennox International, Inc. Company
215 Metropolitan Drive
West Columbia, SC 29170
This manual must be left with the homeowner for future reference.
This is a safety alert symbol and should never be ignored. When you see this symbol on labels or in
manuals, be alert to the potential for personal injury or death.
The equipment covered in this manual is to be installed
by trained and experienced service and installation
technicians. Improper installation, modication, service,
or use can cause electrical shock, re, explosion, or
other conditions which may cause personal injury,
death, or property damage. Use appropriate safety gear
including safety glasses and gloves when installing this
equipment.
WARNING
Risk of electrical shock. Disconnect all remote power
supplies before installing or servicing any portion of the
system. Failure to disconnect power supplies can result
in property damage, personal injury, or death.
WARNING
Installation and servicing of air conditioning equipment
can be hazardous due to internal refrigerant pressure
and live electrical components. Only trained and
qualied service personnel should install or service
this equipment. Installation and service performed by
unqualied persons can result in property damage,
personal injury, or death.
WARNING
Sharp metal edges can cause injury. When installing
the unit, use care to avoid sharp edges.
WARNING
Table of Contents
Installation ...................................................................2
Electrical Wiring...........................................................3
Start-Up .....................................................................11
Operation...................................................................14
Seven-Segment Alert and System Status Codes......14
Maintenance..............................................................20
Homeowner Information ............................................21

507607-03Issue 1827Page 2 of 23
Installation
General
Read this entire instruction manual, as well as the
instructions supplied in separate equipment, before
starting the installation. Observe and follow all warnings,
cautions, instructional labels, and tags. Failure to comply
with these instructions could result in an unsafe condition
and/or premature component failure.
These instructions are intended as a general guide only
for use by qualied personnel and do not supersede any
national or local codes in any way. The installation must
comply with all provincial, state, and local codes as well as
the National Electrical Code (U.S.) or Canadian Electrical
Code (Canada). Compliance should be determined prior
to installation.
4SCU16/18LS condensing units use R410A which is an
ozone-friendly HFC refrigerant. The unit must be installed
with a matching indoor coil and line set. A lter drier
approved for use with R410A is installed in the unit.
NOTE: This product has been designed and manufactured
to meet ENERGY STAR criteria for energy efciency when
matched with appropriate coil components. However,
proper refrigerant charge and proper air ow are critical
to achieve rated capacity and efciency. Installation of
this product should follow the manufacturer’s refrigerant
charging and air ow instructions. Failure to conrm proper
charge and airow may reduce energy efciency and
shorten equipment life.
When servicing or repairing HVAC components, ensure
the fasteners are appropriately tightened. Table 1 shows
torque values for fasteners.
Table 1. Torque Table
Fastener Torque
Stem Caps 8 ft. lbs.
Service Port Caps 8 ft. lbs.
Sheet Metal Screws 16 in. lbs.
#8 Machine Screws 16 in. lbs.
#10 Machine Screws 28 in. lbs.
Compressor Bolts 90 in. lbs.
Inspection of Shipment
Upon receipt of equipment, carefully inspect it for possible
shipping damage. If damage is found, it should be noted
on the carrier’s freight bill. Take special care to examine
the unit inside the carton if the carton is damaged. Any
concealed damage discovered should be reported to the
last carrier immediately, preferably in writing, and should
include a request for inspection by the carrier’s agent. If
any damages are discovered and reported to the carrier
DO NOT INSTALL THE UNIT, as claim may be denied.
Check the unit rating plate to conrm specications are as
ordered.
Location of Unit
Outdoor units operate under a wide range of weather
conditions; therefore, multiple factors must be considered
when positioning the unit. The unit must be positioned
to give adequate clearances for sufcient airow and
servicing. Refer to Figure 1 for installation clearances.
• Place a sound-absorbing material, such as Isomode
under the unit if it will be installed in a location or
position that will transmit sound or vibration to the
living area or adjacent buildings.
Figure 1. Installation Clearances
* A service clearance of 30” must be maintained on one of the
sides adjacent to the control box. Clearance to one of the other
three sides must be 36”. Clearance to one of the remaining two
sides may be 12” and the nal side may be 6”.
A clearance of 24” must be maintained between units.
48” clearance required on top of unit. Maximum soft overhang is
36”.
Slab Mounting
When installing a unit at grade level, install on slab high
enough above grade so that water from higher ground will
not collect around the unit (Figure 2).
Figure 2. Slab Mounting

507607-03 Issue 1827 Page 3 of 23
Roof Mounting
Install unit at a minimum of 4” above surface of the roof.
Locate the unit above a load bearing wall or area of the
roof that can adequately support the unit. Consult local
codes for rooftop applications.
Following are some points to consider when placing and
installing a high-efciency outdoor unit:
Placement
Be aware that some localities are adopting sound
ordinances based on how noisy the unit is at the neighbor’s
home, not at the original installation. Install the unit as far
as possible from the property line. When possible, do not
install the unit directly outside a bedroom window. Glass
has a very high level of sound transmission. Figure 6
shows how to place the outdoor unit and line set to reduce
line set vibration.
Electrical Wiring
All eld wiring must be done in accordance with the National
Electrical Code (NEC) recommendations, Canadian
Electrical Code (CEC) and CSA Standards, or local codes,
where applicable.
Refer to the furnace or blower coil installation instructions
for additional wiring application diagrams and refer to unit
rating plate for minimum circuit ampacity and maximum
overcurrent protection size.
Unit must be grounded in accordance with national and
local codes. Failure to ground unit properly can result in
personal injury or death.
WARNING
Line voltage is present at all components when unit is
not in operation on units with single pole contactors.
Disconnect all remote electric power supplies before
opening access panel. Unit may have multiple power
supplies. Failure to disconnect all power supplies could
result in personal injury or death.
WARNING
1. Install line voltage power supply to unit from a properly
sized disconnect switch. Any excess high voltage eld
wiring should be trimmed or secured away from the
low voltage eld wiring.
2. Ground unit at unit disconnect switch or to an earth
ground. To facilitate conduit, a hole is in the bottom
of the control box. Connect conduit to the control box
using a proper conduit tting. Units are approved for
use only with copper conductors. 24V Class II circuit
connections are made in the low voltage junction box.
Refer to Figure 3 for high voltage eld wiring diagram.
A complete unit wiring diagram is located inside the
unit control box cover and in the back of this document.
Figure 3.
See unit wiring diagram for power supply connections. if the
indoor unit is not equipped with a blower relay, one must be eld
supplied and installed.
Do not connect C (common) connection between indoor unit and
thermostat except when required by the indoor thermostat. Refer
to thermostat installation instructions. C (common) connection
between indoor unit and outdoor required for proper operation.
Figure 4.

507607-03Issue 1827Page 4 of 23
3. Install room thermostat on an inside wall that is not subject to drafts, direct sunshine, or other heat sources.
4. Install low voltage wiring from outdoor to indoor unit and from thermostat to indoor unit (Figure 15).
5. Do not bundle any excess 24V control wire inside control box. Run control wire through installed wire tie and tighten wire
tie to provide low voltage strain relief and to maintain separation of eld-installed low and high voltage circuits.
Field Wiring & Routing - Communicating Controls
Maximum length of wiring (18 gauge) for all connections on the RSBus is 1500 feet (457 meters). Wires should be color
coded, with a temperature rating of 95ºF (35ºC) minimum, and solid core (Class II Rated Wiring). All low voltage wiring must
enter unit through provided bushing installed in electrical inlet.
Indoor Unit Controller
Outdoor Unit
Comfort Sync
®
thermostat
Single wire
to terminal C
Single wire
to terminal C
Unused wires
Unused wires
Comfort Sync
®
Thermostat with a
Non-Communicating Outdoor Unit
ENABLED
FURNACE
Comfort Sync®
THERMOSTAT
NON-COMMUNICATING
OUTDOOR AIR
CONDITIONING UNIT -
1 OR 2 STAGE
Comfort Sync
®
Thermostat
Comfort Sync
®
-Enabled Indoor Furnace
Non-Communicating Outdoor Air Conditioner
OPTIONAL
OUTDOOR
AIR SENSOR
OPTIONAL
DISCHARGE
AIR SENSOR
Comfort Sync
®
Thermostat with an Comfort Sync
®
ENABLED Outdoor Unit
Comfort Sync
®
-Enabled Outdoor Air Conditioner or Heat Pump
OUTDOOR AIR CONDITIONING
OR HEAT PUMP UNIT
OPTIONAL
OUTDOOR
AIR SENSOR
OPTIONAL
DISCHARGE
AIR SENSOR
CLIP ON-BOARD LINK
W915 (Y1 TO Y2) FOR
TWO-STAGE OPERATION
2 STG. ONLY
LSOM ONLY
Comfort Sync
®
Thermostat
Comfort Sync
®
-Enabled Indoor Furnace
Comfort Sync®
ENABLED
FURNACE
Comfort Sync®
Comfort Sync®
THERMOSTAT
Comfort Sync®
ENABLED
NOTE: On communicating systems, extra wires must terminate on the “C” Comfort Sync®terminal strip (RSBus).
Use an additional wire and come off “C” terminal and wire nut all the extra wires together. Termination on the
outdoor control must match the indoor control.
Figure 5.

507607-03 Issue 1827 Page 5 of 23
Line Set Isolation
The following illustrations demonstrate procedures that
ensure proper refrigerant line set isolation. Figure 7 shows
how to install line sets on horizontal runs. Figure 8 shows
how to make a transition from horizontal to vertical. Figure
9 shows how to install line sets on vertical runs.
Table 2. Refrigerant Line Set Diameters (in.)
Model 16 SEER
Liquid Line Suction Line
24 3/8 3/4
36 3/8 7/8
48 3/8 7/8
60 3/8 1-1/8
For lines longer than 50 ft., refer to long line set guidelines.
Brazing Connection Procedure
1. Cut ends of refrigerant lines square (free from nicks or
dents). Debur the ends. The pipe must remain round;
do not pinch end of line.
2. Before making line set connections, use dry nitrogen
to purge the refrigerant piping. This will help to prevent
oxidation and the introduction of moisture into the
system.
3. Use silver alloy brazing rods (5% or 6% silver alloy
for copper-to-copper brazing or 45% silver alloy for
copper-to-brass or copper-to-steel brazing) which are
rated for use with R410A refrigerant.
4. Remove the Schrader core assemblies before brazing
to protect them from damage due to extreme heat.
Replace the cores when brazing is complete.
5. Remove light maroon washers from service valves
and shield light maroon stickers to protect them during
brazing. Wrap a wet cloth around the valve body and
copper tube stub to protect it from heat damage.
Install unit away
from windows
Two 90° elbows installed in lineset
will reduce lineset vibration
Figure 6. Outside Unit Placement and Installation
6. Braze the line set to the service valve. Quench the
joints with water or a wet cloth to prevent heat damage
to the valve core and opening port. The tube end must
stay bottomed in the tting during nal assembly to
ensure proper seating, sealing, and rigidity.
7. Install the thermal expansion valve which is sold
separately and which is approved for use with R410A
refrigerant in the liquid line at the indoor coil (see
Refrigerant Metering Device section).
Refrigerant Piping
If the 4SCU16 LS unit is being installed with a new indoor
coil and line set, the refrigerant connections should be
made as outlined in this section. If an existing line set and/
or indoor coil will be used to complete the system, refer
to this section as well as the section that follows entitled-
Flushing Existing Line Set and Indoor Coil.
If this unit is being matched with an approved line set
or indoor coil which was previously charged with R-22
refrigerant, the line set and coil must be ushed prior to
installation. If the unit is being used with an existing indoor
coil which was equipped with a liquid line which served as
a metering device (RFCI), the liquid line must be replaced
prior to the installation of the 4SCU16 LS unit.
Field refrigerant piping consists of liquid and suction lines
from the outdoor unit (sweat connections) to the indoor coil
(are or sweat connections).
Select line set diameters from Table 2 to ensure that oil
returns to the compressor. Size vertical suction riser
to maintain minimum velocity at minimum capacity.
Recommended line length is 50’ or less. Table 2 shows
the diameters for line sets up to 100’ although vertical lift
applications and trapping requirements need to be reviewed
for line sets over 50’; refer to long line set guidelines.
Installing Refrigerant Line
During the installation of an air conditioning system, it is
important to properly isolate the refrigerant line to prevent
unnecessary vibration. Line set contact with the structure
(wall, ceiling, or oor) may cause objectionable noise when
vibration is translated into sound. As a result, more energy
or vibration can be expected. Close attention to line set
isolation must be observed.
When ushing existing line set and/or indoor coil, be
sure to empty all existing traps. Residual mineral oil can
act as an insulator, preventing proper heat transfer. It
can also clog the thermal expansion valve, reducing
system performance and capacity. Failure to properly
ush system as explained in these instructions will void
warranty.
CAUTION
If ANY refrigerant tubing is required to be buried by state
or local codes, provide a 6 inch vertical rise at service
valve.
CAUTION

507607-03Issue 1827Page 6 of 23
To hang line set from joist or rafter,
use either metal strapping material
or anchored heavy nylon wire ties.
Strapping Material
(around vapor line only)
8’
8’
Tape or Wire Tie
Strap the vapor line to the joist or rafter
at 8intervals then strap the liquid line
to the vapor line.
’
Floor Joist or
Roof Rafter
Metal Sleeve
Floor Joist or Roof Rafter
Tape or Wire Tie
Wire Tie
(around vapor line only)
Figure 7. Refrigerant Line Sets : Installing Horizontal Runs
Figure 8. Refrigerant Line Sets : Transition from Vertical to Horizontal

507607-03 Issue 1827 Page 7 of 23
Figure 9. Refrigerant Line Sets : Installing Vertical Runs
Figure 10. Flushing Connections

507607-03Issue 1827Page 8 of 23
Flushing Existing Line Set and Indoor Coil
This procedure should not be performed on systems which
contain contaminants, such as compressor burn out.
Required Equipment
The following equipment is needed to ush the existing line
set and indoor coil (Figure 10). Two clean R-22 recovery
bottles, an oil-less recovery machine with a “pump down”
feature, and two sets of gauges (one for use with R-22 and
one for use with R-410A).
Flushing Procedure
NOTE: The line set and/or indoor coil must be ushed with
at least the same amount of refrigerant that previously
charged the system. Check the charge in the ushing
cylinder before ushing the unit.
1. Remove existing R-22 refrigerant using the appropriate
procedure.
If the existing outdoor unit is not equipped with shutoff
valves, or if the unit is not operational AND the existing
R-22 refrigerant will be used to ush the system:
Disconnect all power to the existing outdoor unit. Connect
the existing unit, a clean recovery cylinder, and the
recovery machine according to the instructions provided
with the recovery machine. Remove all R-22 refrigerant
from the existing system. Refer to the gauges after
shutdown to conrm that the entire system is completely
void of refrigerant. Disconnect the liquid and suction lines
from the existing outdoor unit.
If the existing outdoor unit is equipped with manual shutoff
valves AND new R-22 refrigerant will be used to ush the
system:
Start the existing R-22 refrigerant system in cooling mode
and close the liquid line valve. Pump all the existing R-22
refrigerant back into the outdoor unit.
(It may be necessary to bypass the low pressure switches
to ensure complete refrigerant evacuation.)
When the low side system pressures reach 0 psig, close
the suction line valve. Disconnect all power to the existing
outdoor unit. Refer to the gauges after shutdown to conrm
that the valves are not allowing refrigerant to ow back
into the low side of the system. Disconnect the liquid and
suction lines from the existing outdoor unit.
2. Remove the existing outdoor unit. Set the new R-410A
unit and follow the brazing connection procedure
outlined previously to make line set connections. Do
not install the R-410A thermal expansion valve at this
time.
3. Make low voltage and line voltage connections to the
new outdoor unit. Do not turn on power to the unit or
open the outdoor unit service valves at this time.
4. Remove the existing R-22 refrigerant ow control
orice or thermal expansion valve before continuing
with ushing procedures. R-22 ow control devices
are not approved for use with R-410A refrigerant and
may prevent proper ushing. Use a eld-provided
tting to reconnect the lines.
5. Remove the pressure tap valve cores from the
4SCU16/18LS units service valves. Connect an R-22
cylinder with clean refrigerant to the suction service
valve. Connect the R-22 gauge set to the liquid line
valve and connect a recovery machine with an empty
recovery tank to the gauge set.
6. Set the recovery machine for liquid recovery and start
the recovery machine. Open the gauge set valves to
allow the recovery machine to pull a vacuum on the
existing system line set and indoor coil.
7. Invert the cylinder of clean R-22 and open its valve to
allow liquid refrigerant to ow in to the system through
the suction line valve. Allow the refrigerant to pass from
the cylinder and through the line set and the indoor coil
before it enters the recovery machine.
8. After all of the liquid refrigerant has been recovered,
switch the recovery machine to vapor recovery so that
all of the R-22 vapor is recovered. Allow the recovery
machine to pull a vacuum on the system.
NOTE: A single system ush should remove all of
the mineral oil from the existing refrigerant lines and
indoor coil. A second ushing may be done (using
clean refrigerant) if insufcient amounts of mineral oil
were removed during the rst ush. After each system
ush, allow the recovery machine to pull a vacuum on
the system at the end of the procedure.
9. Close the valve on the inverted R-22 cylinder and the
gauge set valves. Pump the remaining refrigerant out
of the recovery machine and turn the machine off.
10. Use nitrogen to break the vacuum on the refrigerant
lines and indoor coil before removing the recovery
machine, gauges, and R-22 refrigerant drum. Re-
install pressure tap valve cores into the 4SCU16/18LS
unit’s service valves.
11. Install the xed orice (or thermal expansion valve
approved for use with R-410A refrigerant) in the liquid
line at the indoor coil.
Refrigerant Metering Device
4SCU16/18LS units are designed for use with TXV
systems. Refer to the appropriate following section for
information on installing the chosen refrigerant metering
device.

507607-03 Issue 1827 Page 9 of 23
Figure 11.
An R410A system will not operate properly with an R-22
metering device.
Install the refrigerant metering device as shown in Figure
11. Do not twist cap tubes when loosening the seal nut from
the orice housing. Use wrench to back up the distributor.
Expansion Valve Systems
Expansion valves equipped with Chatleff-type ttings are
available from the manufacturer. See Table 3 for proper
TXV for each unit.
Model Part Number
4SCU16LS-24-36 A4TXV01
4SCU16LS-48 A4TXV02
4SCU16LS-60 A4TXV02
Table 3. TXV Data
To install an expansion valve (Figure 11):
1. Separate the distributor assembly and remove the
piston orice and used Teon seal. Insert nozzle end
of the expansion valve along with a new Teon seal
into the distributor and tighten to 20 - 30 ft. lbs. Use
backup wrench on all wrench ats. Overtightening will
crush the Teon seal and may cause a leak.
2. Attach liquid line portion of distributor assembly along
with new Teon seal to the inlet of the expansion valve.
Tighten to 20 - 30 ft. lbs. Use backup wrench on all
wrench ats. Overtightening will crush the Teon seal
and may cause a leak.
3. Connect the external equalizer line to the equalizer
port on the suction line and tighten to 8 ft. lbs.
4. Strap the superheat sensing bulb to the suction header.
If installing an expansion valve on an indoor coil that
previously used a xed orice, be sure to remove the
existing xed orice. Failure to remove a xed orice when
installing an expansion valve to the indoor coil will result in
improper operation and damage to the system.
Manifold Gauge Set
Manifold gauge sets used with systems charged with
R410A refrigerant must be capable of handling the higher
system operating pressures. The gauges should be rated
for use with pressures 1 - 800 on the high side and a low
side of 30” vacuum to 250 psi with dampened speed to 500
psi. Gauge hoses must be rated for use at up to 800 psi of
pressure with a 4000 psi burst rating.
Liquid and Suction Line Service Valves
The liquid line and suction line service valves (Figure 12)
and service ports are used for leak testing, evacuation,
charging, and checking charge.
Each valve is equipped with a service port which has a
factory-installed Schrader valve. A service port cap protects
the Schrader valve from contamination and serves as the
primary leak seal.
To Access the Schrader Port:
1. Remove the service port cap with an adjustable
wrench.
2. Connect gauge to the service port.
3. When testing is completed, replace service port cap.
Tighten nger tight, then an additional 1/6 turn.
To Open Liquid or Suction Line Service Valve:
1. Remove stem cap with an adjustable wrench.
2. Use service wrench with a hex-head extension to back
the stem out counterclockwise as far as it will go. Use a
3/16” hex head extension for liquid line service valves
and a 5/16” extension for suction line service valves.
3. Replace the stem cap. Tighten nger tight, then tighten
an additional 1/6 turn.
To Close Liquid or Suction Line Service Valve:
1. Remove the stem cap with an adjustable wrench.
2. Use a service wrench with a hex-head extension to
turn the stem clockwise to seat the valve. Tighten
rmly.
3. An R410A system will not operate properly with an
R-22 metering device.
Suction Line (Ball Type) Service Valve
Suction line (ball type) service valves function the same
way as the other valves; the difference is in the construction
(Figure 13).
The ball valve is equipped with a service port with a factory-
installed Schrader valve. A service port cap protects the
Schrader valve from contamination and serves as the
primary seal.

507607-03Issue 1827Page 10 of 23
Leak Testing
After the line set has been connected to the indoor and
outdoor units, the line set connections and indoor unit must
be checked for leaks.
Figure 12. Service Valve (valve shown closed)
Figure 13. Ball Type Service Valve (valve shown open)
Refrigerant can be harmful if inhaled. Refrigerant must
always be used and recovered responsibly. Incorrect or
irresponsible use of refrigerant can result in personal
injury or death.
WARNING
Never use oxygen to pressurize refrigeration or air
conditioning systems. Oxygen will explode on contact
with oil and could cause personal injury or death.
WARNING
Using an Electronic Leak Detector
1. Connect the high pressure hose of the manifold gauge
set to the suction valve service port. (Normally the
high pressure hose is connected to the liquid line port;
however, connecting it to the suction ports helps to
protect the manifold gauge set from damage caused
by high pressure.)
2. With both manifold valves closed, connect the cylinder
of R410A refrigerant. Open the valve on the R410A
cylinder (vapor only).
3. Open the high pressure side of the manifold to allow
R410A into the line set and indoor unit. Weigh in a
trace amount of R410A. A trace amount is a maximum
of 2 oz. of refrigerant or 3 lbs. pressure. Close the
valve on the R410A cylinder and the valve on the high
pressure side of the manifold gauge set. Disconnect
the R410A cylinder.
4. Connect a cylinder of nitrogen with a pressure
regulating valve to the center port of the manifold
gauge set. When using high pressure gas such as
nitrogen for this purpose, be sure to use a regulator
that can control the pressure down to 1 or 2 psig.
5. Adjust nitrogen pressure to 150 psig. Open the valve
on the high side of the manifold gauge set to pressurize
the line set and the indoor coil.
6. After a short period of time, open a refrigerant port to
make sure that an adequate amount of refrigerant has
been added for detection (refrigerant requirements
will vary with length). Check all joints for leaks. Purge
nitrogen and R410A mixture. Correct any leaks and
rechecks.
Evacuation
Evacuating the system of non-condensables is critical for
proper operation of the unit. Non-condensables are dened
as any gas that will not condense under temperatures and
pressures present during operation of an air conditioning
system. Non-condensables and water vapor combine with
refrigerant to produce substances that corrode copper
piping and compressor parts.

507607-03 Issue 1827 Page 11 of 23
Do not use a compressor to evacuate a system. Avoid
deep vacuum operation. Extremely low vacuums can
cause internal arcing and compressor failure. Danger of
equipment damage. Damage caused by deep vacuum
operation will void warranty.
WARNING
Use a thermocouple or thermistor electronic vacuum
gauge that is calibrated in microns. Use an instrument that
reads down to 500 microns.
1. Connect the manifold gauge set to the service valve
ports as follows:
• Low pressure gauge to suction line service valve
• High pressure gauge to liquid line service valve
2. Connect micron gauge.
3. Connect the vacuum pump (with vacuum gauge) to
the center port of the manifold gauge set.
4. Open both manifold valves and start vacuum pump.
5. Evacuate the line set and indoor unit to a minimum
of 500 microns or lower. During the early stages of
evacuation, it is desirable to close the manifold gauge
valve at least once to determine if there is a rapid
rise in pressure. A rapid rise in pressure indicates a
relatively large leak. If this occurs, the leak testing
procedure must be repeated.
6. When 500 microns or lower is maintained, close the
manifold gauge valves, turn off the vacuum pump, and
disconnect the manifold gauge center port hose from
the vacuum pump. Attach the manifold gauge center
port hose to a nitrogen cylinder with pressure regulator
set to 150 psig and purge the hose. Open the manifold
gauge valves to break the vacuum in the line set and
indoor unit. Close the manifold gauge valves.
7. Shut off the nitrogen cylinder and remove the manifold
gauge hose from the cylinder. Open the manifold
gauge valves to release the nitrogen from the line set
and indoor unit.
8. Reconnect the manifold gauge to the vacuum pump,
turn the pump on, and continue to evacuate the line
set and indoor unit until 500 microns is maintained
within a 20 minute period after shutting off the vacuum
pump and closing the manifold gauge valves.
9. When the requirements above have been met,
disconnect the manifold hose from the vacuum pump.
Open the service valves to break the vacuum in the
line set and indoor unit.
Start-Up
If unit is equipped with a crankcase heater, it should
be energized 24 hours before unit start-up to prevent
compressor damage as a result of slugging.
CAUTION
1. Rotate fan to check for frozen bearings or binding.
2. Inspect all factory and eld-installed wiring for loose
connections.
3. After evacuation is complete, open liquid line and
suction line service valves to release refrigerant
charge (contained in outdoor unit) into system.
4. Replace the stem caps and secure nger tight, then
tighten an additional 1/6 of a turn.
5. Check voltage supply at the disconnect switch. The
voltage must be within the range listed on the unit
nameplate. If not, do not start equipment until the
power company has been consulted and the voltage
condition corrected.
6. Set thermostat for cooling demand, turn on power to
indoor blower, and close the outdoor unit disconnect
switch to start the unit.
7. Recheck unit voltage with unit running. Power must be
within range shown on unit nameplate.
Refrigerant Charging
This system is charged with R-410A refrigerant which
operates at much higher pressures than R-22. The liquid
line drier provided with the unit is approved for use with
R-410A. Do not replace it with one designed for use with
R-22. This unit is NOT approved for use with coils which
use capillary tubes as a refrigerant metering device.
R410A refrigerant cylinders are rose colored. Refrigerant
should be added through the suction valve in the liquid
state.
Certain R-410A cylinders are identied as being equipped
with a dip tube. These allow liquid refrigerant to be drawn
from the bottom of the cylinder without inverting the
cylinder. Do not turn this type of cylinder upside down to
draw refrigerant.
Units are factory charged with the amount of R410A
refrigerant indicated on the unit rating plate. This charge is
based on a matching indoor coil and outdoor coil with 15’
line set. For varying lengths of line set, refer to Table 4 for
refrigerant charge adjustment. A blank space is provided
on the unit rating plate to list the actual eld charge.

507607-03Issue 1827Page 12 of 23
Table 4. Refrigerant Charge Adjustment
Liquid Line Set Diameter Oz. Per 5 ft. Adjust from 15
ft. Line Set*
3/8 in. 3 oz. per 5 ft.
* If line length is greater than 15 ft. , add this amount. If line
length is less than 15 ft., remove this amount.
Mineral oils are not compatible with R-410A. If oil must
be added, it must be a polyolester oil.
IMPORTANT
If the system is void of refrigerant, clean the system using
the procedure described below.
1. Use dry nitrogen to pressurize the system and check
for leaks. Repair leaks, if possible.
2. Evacuate the system to remove as much of the
moisture as possible.
3. Use dry nitrogen to break the vacuum.
4. Evacuate the system again.
5. Weigh the appropriate amount of R-410A refrigerant
(listed on unit nameplate) into the system.
6. Monitor the system to determine the amount of
moisture remaining in the oil. Use a test kit to verify
that the moisture content is within the kit’s dry color
range. It may be necessary to replace the lter drier
several times to achieve the required dryness level. If
system dryness is not veried, the compressor will fail
in the future.
The outdoor unit should be charged during warm weather.
However, applications arise in which charging must occur
in the colder months. The method of charging is determined
by the unit’s refrigerant metering device and the outdoor
ambient temperature.
Measure the liquid line temperature and the outdoor
ambient temperature as outlined below:
1. Connect the manifold gauge set to the service valve
ports as follows:
• Low pressure gauge to suction line service valve
• High pressure gauge to liquid line service valve
2. Close manifold gauge set valves. Connect the center
manifold hose to an upright cylinder of R-410A.
3. If room temperature is below 70°F, set the room
thermostat to call for heat. This will create the
necessary load for properly charging the system in the
cooling cycle.
4. Use a digital thermometer to record the outdoor
ambient temperature.
5. When the heating demand has been satised, switch
the thermostat to cooling mode with a set point of
68°F. When pressures have stabilized, use a digital
thermometer to record the liquid and suction line
temperatures.
6. The outdoor temperature will determine which
charging method to use. Proceed with the appropriate
charging method.
Charge Using Weigh-In Method (Fixed Orice/TXV
Systems) - Outdoor Temperatures Below 65°F
If the system is void of refrigerant, or if the outdoor ambient
temperature is cool, use the weigh-in method to charge the
unit. Do this after any leaks have been repaired.
1. Recover the refrigerant from the unit.
2. Conduct a leak check, then evacuate as previously
outlined.
3. Weigh in the charge according to the total amount
shown on the unit nameplate.
If weighing facilities are not available or if unit is being
charged during warm weather, use one of the following
procedures.
Charge Using Subcooling Method (Fixed Orice/TXV
Systems) - Outdoor Temperatures 65°F or Above
If charging a xed orice or TXV system when the outdoor
ambient temperature is 65°F or above, the subcooling
method can be used to charge the unit.
1. With the manifold gauge hose still on the liquid
service port and the unit operating stably, use a digital
thermometer to check the liquid line temperature.
For best results, use the same digital thermometer
to check both the outdoor ambient and the liquid line
temperatures.
2. At the same time, record the liquid line pressure
reading.
3. Use the temperature/pressure chart to determine the
saturation temperature for the liquid line pressure
reading.
4. Subtract the liquid line temperature from the saturation
temperature (according to the chart) to determine
subcooling.
5. Compare the subcooling value with those shown on
charge label located on back of control box cover.
Charge Using Approach Method (TXV System) -
Outdoor Temperatures 65°F or Above
The following procedure is intended as a general guide
and is for use on expansion valve systems only. For best
results, indoor temperature should be 70°F to 80°F. Monitor
system pressures while charging.
1. Record outdoor ambient temperature using a digital
thermometer.

507607-03 Issue 1827 Page 13 of 23
2. Attach high pressure gauge set and operate unit for
several minutes to allow system pressures to stabilize.
3. Compare stabilized pressures with those provided in
the charge tables on inside control box cover. Minor
variations in these pressures may be expected due
to differences in installations. Signicant differences
could mean that the system is not properly charged
or that a problem exists with some component in the
system. Pressures higher than those listed indicate
Figure 14. Control Board
Non-Communicating System
For systems with a non-communicating thermostat, the system
will operate based on the settings of the jumpers located on the
control board. All system settings must be done at the control
board.
Communicating System
For a communicating system, the Comfort Sync thermostat
must be used. The complete conguration of the outdoor unit
is performed using the Comfort Sync thermostat. For complete
details on how to integrate this unit into a Comfort Sync-enabled
system, please refer to the Comfort Sync Wi-Fi installer’s system
setup guide.
100
90
70
50
100
90
70
50
100
90
70
50
100
90
70
50
100
90
70
50
55
50
45
40
55
50
45
40
55
50
45
40
55
50
45
40
ON
OFF
30
PSC
LO PS HI PS Y1 OUT Y2 OUT OUT
O
R I+ I - C DS O Y1 Y2 L W
COIL AMB DIS
OPEN = OFF OPEN = 90 F
2ND STAGE
LOCK IN
55 F
50 F
45 F
40 F
DEFROST
TERMINATION
100 F
90 F
70 F
50 F
COMP SHIFT
DELAY
J4J3
FAN
CYCLING
J1 J2

ECM
Y1
ECM
Y2
COM PARK FAN
PWM
DS TO R
7-Segment
Display
Push
Button
J2 (Two-Stage
Heat Pump Only)
Second Stage Lock-In
Temperature
55 Degree
Target
50 Degree
Target
45 Degree
Target
40 Degree
Target
(Default)
J4 (HP Only)
Compressor Shift Delay
30 Second
Delay
(Default)
No Delay
J1 (HP Only)
Defrost Termination Temperature
100 Degree
Target
90 Degree
Target
70 Degree
Target
50 Degree
Target
Default When
Jumper is
Removed or
Missing
90
J3 (All Units)
Fan De-Icing
Jumper ON
Fan On 5 Minutes
Jumper OFF
Digable (Default)
DS to R Jumper (Two-Stage Heat Pump Only)
Break off DS to R jumper if Enhanced Dehumidication Accessory (EDA) is used
with Comfort Sync thermostat (two-stage units only).
that the system is overcharged. Pressures lower than
those listed indicate that the system is undercharged.
Verify adjusted charge using the approach method.
4. Use the same digital thermometer to check liquid line
temperature.
5. Subtract the outdoor ambient temperature from the
liquid line temperature to determine the approach
temperature.
6. Compare the approach value with those shown on
charge label located on back of control box cover

507607-03Issue 1827Page 14 of 23
Seven-Segment Alert and System Status
Codes
Alert codes are displayed using the seven segment display
located on the outdoor control.
NOTE: System fault and lockout alarm code displays takes
precedence over system status (cooling, heating stages or
defrost/dehumidication).
The seven segment will display an abnormal condition
(error code) when detected in the system. A list of the
codes are shown in Table 5.
Re-Setting Alert Codes
Alert codes can be reset manually or automatically:
Manual Reset
Manual reset can be achieved by one of the following
methods:
• Disconnecting R wire from the main control’s R
terminal.
• Turning the indoor unit off and back on again. After
power up all existing codes will display 60 seconds
and then clear.
Automatic Reset
After an alert is detected, the main control continues to
monitor the unit’s system and compressor operations.
When/if conditions return to normal, the alert code is turned
off automatically.
Operation
Outdoor unit and indoor blower cycle on demand from
the room thermostat. When the thermostat blower switch
is moved to the ON position, the indoor blower operates
continuously.
Filter Drier
The unit is equipped with a large capacity bi-ow lter
which keeps the system clean and dry. If replacement is
necessary, replace with one of similar design and capacity.
The replacement lter drier must be suitable for use with
R410A refrigerant.
Crankcase Heater
If unit is equipped with a crankcase heater, it should
be energized 24 hours before unit start-up to prevent
compressor damage as a result of slugging.
Emergency Heat Function (Room Thermostat)
An emergency heat function is designed into some room
thermostats. This feature is applicable when isolation of
outdoor unit is required or when auxiliary electric heat is
staged by outdoor thermostats. When the room thermostat
is placed in the emergency heat position, the outdoor unit
control circuit is isolated from power and the eld-supplied
relays bypass the outdoor thermostats. An amber indicating
light simultaneously comes on to remind the homeowner
that the unit is operating in the emergency heat mode.
Emergency heat is usually used during an outdoor
shutdown, but it should also be used following a power
outage if power has been off for over an hour and the
outdoor temperature is below 50°F. System should be left
in the emergency heat mode at least 6 hours to allow the
crankcase heater sufcient time to prevent compressor
slugging.
Outdoor unit and indoor blower cycle on demand from
the room thermostat. When the thermostat blower switch
is moved to the ON position, the indoor blower operates
continuously.
Time Delay
The timed-off delay is 5 minutes long. The delay helps
to protect the compressor from short cycling in case the
power to the unit is interrupted or a pressure switch opens.
Pressure Switch Circuit
The control includes two pressure switch circuits. A high
pressure switch is connected to the board’s HI-PS terminals
(Figure 14). The low pressure, or loss-of-charge pressure
switch, is connected to the LO-PS terminals.
During a single demand cycle, the defrost control will lock
out the unit after the fth time that the circuit is interrupted
by and pressure switch wired to the control board. In
addition, the diagnostic LEDs will indicate a locked-out
pressure switch after the fth occurrence of an open
pressure switch.
The unit will remain locked out until power to the board
is interrupted, then re-established, or until the error is
cleaned.
NOTE: The control board ignores input from the low
pressure switch terminals as follows:
• During the TEST mode
• During the 90 seconds start-up period
Fan Cycling (J3)
Fan cycling routine when activated will cycle the fan ON
(Figure 14) for ve minutes if the outdoor ambient air
temperature is between 15ºF and 35ºF and the compressor
has been OFF for 25 to 30 minutes. This option is to help
reduce the potential for ice build up on the orice ring
during system OFF cycles that are greater than 25 to 30
minutes.

507607-03 Issue 1827 Page 15 of 23
Seven-Segment Display Alert Codes
Code Diagnostic Codes / Status of Equipment Action Required to Clear and Recover
E105 Device communication problem - No other devices on RS
BUS (Communication system).
Equipment is unable to communicate. Indicates numerous
message errors. In most cases, errors are related to electrical
noise. Make sure high voltage power is separated from
RSBus. Check for mis-wired and/or loose connections
between the stat, indoor unit, and outdoor unit. Check for a
high voltage source of noise close to the system. Fault clears
after communication is restored.
E120 Unresponsive device (Communicating systems only). Usually caused by delay in outdoor unit responding to indoor
unit poling. Recycle power. Check all wiring connections.
Cleared after unresponsive device responds to any inquiry.
E124 Active communicating thermostat signal missing for more
than 3 minutes (Communicating systems only).
Equipment lost communication with the thermostat. Check
four wiring connections, ohm wires, and cycle power at the
thermostat. Alert stops all services and waits for heartbeat
message from thermostat (subnet controller). Cleared after
valid thermostat (subnet) message is received.
E125 Control failed self-check, internal error, failed hardware.
Will restart if error recovers, Integrated control not
communicating Covers hardware errors (ame sense
circuit faults, pin shorts, etc).
Hardware problem on the control. Cycle power on control.
Replace if problem prevents service and is persistent. Cleared
300 seconds after fault recovered.
E126 Control internal communication problem. Hardware problem on the control. Cycle power on control.
Replace if problem prevents service and is persistent. Cleared
300 seconds after fault recovered.
E131 Corrupted control parameters (Verify conguration of
system) (Communicating systems only).
Recongure the system. Replace control if heating or cooling
is not available. Only applicable in the communicating mode
not in startup. Exit from Commissioning and Execute Se+
factory Default mode. Control will still operate on default
parameter settings.
E180 Outdoor air temperature sensor failure. Only shown if
shorted or out of range (Communicating systems only)
Compare outdoor sensor resistance to temperature
resistance charts in unit installation instructions. Replace
sensor pack if necessary. At beginning of (any) conguration,
furnace or air handler control will sense outdoor air and
discharge air temperature sensor(s) If detected (reading
in range), appropriate feature will be set as installed and
that could be seen in 'About ' screen. In normal operation
after control recognizes sensors, alarm will be sent if valid
temperature reading is lost. To get rid of setting and alarm,
redo conguration and make sure that temperature sensor is
marked as not installed in indoor Unit ‘About’ screen. When
indoor unit control is replaced thermostat will ‘tell’ new control
if temperature sensor is in system or not. Clears 30 seconds
after fault recovered.
E409 LSOM - Compressor low voltage. Secondary voltages below 18VAC. After 10 minutes, operation
is discontinued. Clears the code after voltage is higher than
20VAC for 2 seconds or after power reset.
E410 The outdoor unit pressure is below the required limit. Unit pressure is below the lower limit. The system is shut
down. The low pressure switch for HFC410A will open at
40 PSIG and close at 90 PSIG. Conrm that the system is
properly charged with refrigerant. Check TXV, indoor unit
blower motor, dirty lters or clogged refrigerant lter. Conrm
that the evaporator coil is clean. The alarm clears after the
pressure switch closes or after a power rest.
NOTE: Additional codes may be found in the Comfort Sync room thermostat manual.
Table 5. 7-Segment Alert and System Status Codes

507607-03Issue 1827Page 16 of 23
Code Diagnostic Codes / Status of Equipment Action Required to Clear and Recover
E411 The low pressure switch has opened 5 times during one
cooling cycle. As a result, the system will shut down.
Open low pressure switch error count reached 5 strikes. The
low pressure switch for R410A will open at 40 PSIG and close
at 90 PSIG. Conrm that the system is properly charged with
refrigerant. Check TXV, indoor unit blower motor, dirty lters
or clogged refrigerant lter. Conrm that the evaporator coil is
clean. The alarm clears after a power rest.
E412 The outdoor unit pressure is above the required limit. The
system will shut down.
Unit pressure is above the upper limit. System is shut down.
The high pressure switch for HFC410A will open at 590 PSIG
and close at 418 PSIG. Conrm that the system is properly
charged with refrigerant. Check condenser fan motor, TXV,
indoor unit blower motor, stuck reversing valve or clogged
refrigerant lter. Conrm that the outdoor unit is clean. The
alarm clears after 4 consecutive normal compressor run
cycles, the pressure switch closes or a power reset.
E413 The high pressure switch has opened 5 times during one
cooling cycle. As a result, the Comfort Sync thermostat
will shut down.
Open high pressure switch error count reached 5 strikes.
System is shut down. The high pressure switch for HFC410A
will open at 590 PSIG and close at 418 PSIG. Conrm that the
system is properly charged with refrigerant. Check condenser
fan motor, TXV, indoor unit blower motor, stuck reversing
valve or clogged refrigerant lter. Conrm that the outdoor unit
is clean. The alarm clears after a power reset.
E414 The discharge line temperature is higher than the
recommended upper limit of 279°F.
Discharge line temperature is > 279°F. Conrm that the
system is properly charged with refrigerant. Check system
operating pressures and compare to unit charging charts in
installation manual. Conrm that the outdoor unit is clean. The
alarm clears after the discharge temperature is < 225°F.
E415 The discharge line temperature has been consistently
higher than the recommended upper limit of 279°F.
Discharge line high temperature error count reached 5
strikes. Conrm that the system is properly charged with
refrigerant. Check system operating pressures and compare
to unit charging charts in installation manual. Conrm that the
outdoor unit is clean. The alarm clears after the discharge
temperature is < 225°F. The alarm clears after a power reset.
E416 The outdoor coil sensor is either open, short-circuited
or the temperature is out of sensor range. As a result,
the outdoor unit control will not perform any defrost
tempering.
Coil sensor being detected open or shorted, or temperature is
out of coil sensor range. Outdoor unit control will not perform
demand or time/temperature defrost operation. System will
still heat or cool. Check the resistance of the coil sensor and
compare to temperature resistance chart. Replace coil sensor
if needed. The alarm clears when outdoor unit control detects
proper coil sensor readings or after a power reset.
E417 The outdoor unit discharge sensor is either open, short-
circuited or the temperature is out of sensor range. As a
result, the outdoor unit control will not perform any defrost
tempering.
Outdoor unit control detects open or shorted discharge
sensor, or temperature that is out of discharge sensor range.
Check the resistance of the discharge sensor and compare
to temperature resistance chart; replace if needed. Reset
by replacing the discharge sensor. This fault is detected
by allowing the unit to run for 90 seconds before checking
discharge sensor resistance. If the discharge sensor
resistance is not within range after 90 seconds, the board will
count one fault. After 5 faults, the board will lock out. Check
for proper sensor reading and attachment to line. The alarm
clears after a power reset.
E418 There is a faulty W output circuit. Faulty W output circuit. Conrm that the unit is not running.
Check for mis-wiring. Disconnect thermostat lines from W
and verify 24VAC on the W. If 24VAC is present, replace the
board.
E419 The W output on the outdoor unit has reported more
than 5 errors. As a result, the system has shut down the
outdoor unit.
W output hardware fault count reached 5 strikes.
NOTE: Additional codes may be found in the Comfort Sync room thermostat manual.
Table 5. 7-Segment Alert and System Status Codes

507607-03 Issue 1827 Page 17 of 23
Code Diagnostic Codes / Status of Equipment Action Required to Clear and Recover
E420 The heat pump defrost cycle has taken more than 20
minutes to complete.
Defrost cycle lasts longer than 20 minutes. This alarm is
applicable with non-communicating heat pump system only.
Check heat pump defrost operation. The alarm is cleared after
the “W1” signal is removed.
E421 The W output terminal on the outdoor unit is not wired
correctly.
Voltage sensed on W and O when Y1 thermostat input is
deactivated. Another device or wiring fault is energizing W
check wiring. The alarm clears when wiring is corrected or
after a power reset.
NOTE: Additional codes may be found in the Comfort Sync room thermostat manual.
Table 5. 7-Segment Alert and System Status Codes
Mode Description Example of Display
Power Up / Reset
Unit type and number of stages is
displayed. Verify conguration with
information published on the unit
nameplate. If the information is
incorrect, refer to ow chart “Manual
Conguration of Unit Type” to
recongure control.
1 Stage AC: 1AC
2 Stage AC: 2AC
1 Stage AC: 1HP
1 Stage AC: 2HP
Power-Up 7-Segment Display String
2 H P ___
___
___
___
___
___
Unit Type / Stages No Capacity No Fan Prole
Power Up / Reset
following display
of self-discovered
conguration
Unit nominal capacity is displayed. If
not programmed, then three horizontal
lines and the decimal point are
displayed for 2 seconds.
Power up nominal capacity display of an 4SHP - LS136
Power-Up 7-Segment Display String
2 H P 3 6 ___
___
___
Unit Type / Stages Capacity No Fan Prole
Power Up / Reset
following display
of nominal
capacity
Fan Prole code (a single- or two-digit
number).
Displays the number of the selected fan prole.
Power-Up 7-Segment Display String
2 H P 3 6 3
Unit Type / Stages Capacity Fan Prole
Idle Mode Decimal point blinks at 1 Hz Idle Mode: Decimal point blinks at 1 Hz (0.5 second on, 0.5 second
off). Display OFF.
Soft Disabled Top and bottom horizontal line and
decimal point blink at 1 Hz.
Soft Disabled: Top and bottom horizontal line and decimal point blink
at 1 Hz (0.5 second on, 0.5 second off). NOTE: Control should be
replaced.
O.E.M. Test Mode All segments ashing at 2 Hz (unless error is detected). NOTE: Control
should be replaced.
*Information will be displayed, but does not apply to this unit.
Table 6. Outdoor Control 7-Segment Unit Status Displays

507607-03Issue 1827Page 18 of 23
Mode Description Example of Display
Anti-Short Cycle
Delay
Middle line shall blink at 1 Hz for 2 seconds, followed by a two-second
display of the rounded up number of minutes left in the timer (two
minutes, one second shall be displayed as “3”). The Anti-Short Cycle
Delay time remaining is displayed when the delay is active.
Cooling Stage Shows what stage of heat pump is
currently operating.
Following string is repeated if two-stage cooling is active with outdoor
fan speed set at 700 RPM. NOTE: A - If available, displays outdoor
ambient temperature.
C2 pause F700 pause
Heat Pump Stage Shows what stage of heat pump is
currently operating.
Following string is repeated if rst-stage cooling is active with outdoor
fan speed set at 600 RPM. NOTE: A - If available, displays outdoor
ambient temperature.
H1 pause F600 pause
Defrost Mode Shown only while in an active defrost.
Following string is repeated if defrost is active while unit was in rst-
stage heat pump heating mode:
dF pause H1 pause
Dehumidication
Mode
Shows that the unit is providing
dehumidication instead of straight
cooling.
Following string is repeated if dehumidication is active with outdoor
fan speed set at 225 RPM:
dpause f225 pause
Diagnostic Recall Shows the last 10 stored diagnostic
error codes.
If rst error is E250, second E231:E pause 250 pause Epause 231
Next codes (up to 10) are shown using same method.
If there are no error codes stored: Epause 000
Fault Memory
Clear
After the fault memory is cleared, the following string is displayed with
0.5 seconds character on/off time:
0000 pause
Active error in
outdoor control
idle mode
Shows all active error(s) codes.
Following string is repeated if Error E125 and E201 are present:
E125 pause E201
Active error in run
mode
Shows current status and all active
error(s) codes.
Following string is repeated if Error E311 is present while blower speed
at 700 RPM:
F700 pause E311
Outdoor Ambient
Temperature
(OAT)
Any time OAT is sensed in operating
range, value is displayed if unit is in
diagnostic and non-diagnostic modes.
Following string is repeated if second stage cooling is active with
outdoor fan speed set at 650 RPM and OAT is 104°F:
C2 pause F650 pause A104 pause
Outdoor Coil
Temperature
(OCT)
Any time OCT is sensed in operating
range, value is displayed if unit is in
diagnostic mode.
Following string is repeated if 2nd stage heat is active with outdoor fan
speed set at 550 RPM and OCT is 25°F:
H2 pause F550 pause c25 pause
Discharge Line
Temperature (DIS)
Any time DIS is sensed in operating
range, value is displayed if unit is in
diagnostic mode.
Following string is repeated if 2nd stage cooling is active with outdoor
fan speed set at 650 RPM and DIS is 185°F
C2 pause F650 pause d185 pause
*Information will be displayed, but does not apply to this unit.
Table 6. Outdoor Control 7-Segment Unit Status Displays

507607-03 Issue 1827 Page 19 of 23
Table 7. Error Recall Menu Options
Error Code Recall Mode
(NOTE: control must be in Idle mode)
Solid ETo enter error code recall mode, push and hold button until solid Eappears, then release button. Control
will display up to 10 error codes stored in memory. If E000 is displayed, there are no stored error codes.
Solid __
__
__ To exit error code recall mode, push and hold button until three solid horizontal bars appear, then release
button. NOTE: Error codes are not cleared.
Solid cTo clear error codes stored in memory, continue to hold push button while the 3 horizontal bars are
displayed. Release push button when solid c is displayed.
Blinking cHold push button for three seconds to conrm command to delete codes. Error codes are cleared.
NOTE: Once the error history is deleted, it cannot be recovered. After the history is deleted, the unit will reset itself.
* Information will be displayed, but does not apply to this product.
Display Display and action (normal operation) Display and action (conguration and test mode)
Power-Up
Display string displays > number of unit stages > pause > AC or HP unit > pause > unit capacity in BTUs > pause >
RPM setting of outdoor fan. If 3 horizontal bars are displayed during any sequence of this string, it indicates that the
specic parameter is not congured.
-Idle mode - decimal blinks at 1 Hz > 0.5 second ON, 0.5 second OFF
A
Ain the display string represents the ambient
temperature in °F at the outdoor sensor on the outdoor
unit.
Enter A test mode: Display will string active error code(s)
E, ambient A, coil cand discharge dtemperature in °F at
outdoor unit.
cEnter A test mode: Display will string active error codes (E), ambient (A), coil (c), and discharge (d) temperature in °F
at outdoor unit.
d
d - dehumidication mode string > d> pause > F
(Outdoor fan) RPM > pause > A(ambient temp displayed)
> pause > repeat mode. IMPORTANT: On 2-stage unit,
R to DS link must be cut and correct RPM outdoor fan
prole selected for outdoor fan to operate at lower RPM
speed when EDA is active.
Enter d test mode: Forced defrost. (System must be
congured as HP. Unit must be running in heating
mode). Test defrost will terminate when coil terminate
temperature is reached (or 10 seconds, whichever is
longer) or 14 minutes if coil temperature remains below
terminate temperature or by pushing button down for less
than 2 seconds. Enter A test mode: Display will string
active error codes E, ambient A, coil cand discharge d
temperature in °F at outdoor unit.
dF dF displays when system is in defrost mode - unit must be running in heating mode, outdoor ambient must be below
65°F and outdoor coil temperature must be below defrost termination temperature.
F*
Fin the display string indicates RPM setting output on
terminals PWM and com (used with EBM motors). RPM
displayed does not apply to motor connected on ECM Y1
and ECM Y2.
Enter F test mode: Control outputs DC Voltage onto
PWM and com terminals. Outdoor fan will cycle ON for
10 minutes at 490 RPM. To exit test - Push and hold
button until three horizontal bars display. Release button,
outdoor fan will cycle OFF. (Test DOES NOT output DC
voltage to ECM Y1 and ECM Y2 terminals)
H1 Heat stage 1 string display > pause > Foutdoor fan RPM displayed > pause > A(ambient temperature displayed >
pause > repeat mode.
H2 Heat stage 2 string display > pause > Foutdoor fan RPM displayed > pause > A(ambient temperature displayed >
pause > repeat mode.
C1 Cool stage 1 string display > pause > Foutdoor fan RPM displayed > pause > A(ambient temperature displayed >
pause > repeat mode.
C2 Cool stage 2 string display > pause > Foutdoor fan RPM displayed > pause > A(ambient temperature displayed >
pause > repeat mode.
* Information will be displayed, but does not apply to this product.
Table 8. Field Test and Program Menu Options

507607-03Issue 1827Page 20 of 23
Conguring Unit Capacity
(NOTE: Control must be in Idle mode)
Solid PC
Release push button - Allows user to select Unit Capacity. IMPORTANT: Field replacement control
may need to be manually congured to validate outdoor unit capacity. Refer to unit nameplate model
number for capacity in 1,000 of BTUs. (18, 24, 30, 36, 42, 48, 60)
Blinking PC
Push and hold button - Control will display unit capacity number for 3 seconds. When the correct
unit capacity number is displayed, release button. Selected code will ash for a 10-second period.
During that period, hold push button for 3 seconds to store code. Once code is stored, control will
automatically exit Field Test Mode. If 10-second period expires or push button is held less than 3
seconds, control will automatically exit Field Test Mode and go into Idle Mode without storing unit
capacity number. If this happens, conguring procedure must be repeated.
Table 9. Conguring Unit Capacity
Display Code Procedure
Solid Pt
Release push button - Allows user to select type and number of stages on outdoor unit.
IMPORTANT: Field replacement control may need to be manually congured to validate outdoor
unit fan RPM setting is right for unit capacity. See RPM table on unit wiring diagram for proper RPM
settings. Type and number of stages: 1AC, 2AC, 1HP, 2HP - AC - air conditioning and HP - Heat
Pump.
Blinking Pt
Push and hold button - Control will display type and number of stages for 3 seconds. When the
correct type and number of stages is displayed, release button. Selected code will ash for a
10-second period. During that period, hold push button for 3 seconds to store code. Once code is
stored, control will automatically exit Field Test Mode. If 10-second period expires or push button is
held for less than 3 seconds, control will automatically exit Field Test Mode and go into Idle Mode
without storing type and number of stages. If this happens, conguring procedure must be repeated.
Table 10. Conguring Type and Number of Stages
Maintenance
Before performing maintenance operations on system,
turn the electric power to unit OFF at disconnect
switch(es). Unit may have multiple power supplies.
Electrical shock could cause personal injury or death.
WARNING
Maintenance and service must be performed by a qualied
installer or service agency.
At the beginning of each cooling season, the system should
be checked as follows:
1. Clean and inspect condenser coil. Coil may be ushed
with a water hose. Be sure the power is off before
using water to clean the coil.
2. Outdoor fan motor is pre-lubricated and sealed. No
further lubrication is needed.
3. Visually inspect connecting lines and coils for evidence
of oil leaks.
4. Check wiring for loose connections.
5. Check for correct voltage at unit (with unit operating).
6. Check amp-draw outdoor fan motor.
Unit nameplate _________ Actual _________
NOTE: If owner complains of insufcient cooling, the unit
should be gauged and refrigerant charge checked.
Refer to the Refrigerant Charging section.
Indoor Coil
1. Clean coil, if necessary.
2. Check connecting lines and coils for evidence of oil
leaks.
3. Check condensate pan line and clean, if necessary.
Indoor Unit
1. Clean or change lters.
2. Adjust blower speed for cooling. Measure the pressure
drop over the coil to determine the correct blower CFM.
3. Belt drive blowers: Check belt for wear and proper
tension.
4. Check all wiring for loose connections.
5. Check for correct voltage at unit (with unit operating).
6. Check amp-draw on blower motor.
Unit nameplate _________ Actual _________