Nordyne MT5QD-060K, MT5QD-048K, MT5QD-042K, MT5QD-036K, MT5QD-030K Owner’s Manual
...
Outdoor Heat Pump
13 SEER High Efficiency Split System
These units have been designed and tested for capacity and efficiency in accordance with A.R.I.
Standards. Split System Heat Pump units are designed for use with a wide variety of fossil fuel
furnaces, electric furnaces, air handlers, and evaporator coil combinations.
These instructions are primarily intended to assist qualified individuals experienced in the proper
installation of heating and/or air conditioning appliances. Some local codes require licensed
installation/service personnel for this type of equipment. Read all instructions carefully before
starting the installation.
USER'S INFORMATION
Read this owner information to become familiar with the capabilities and use of your appliance.
Keep this with literature on other appliances where you have easy access to it in the future. If a
problem occurs, check the instructions and follow recommendations given. If these suggestions
don't eliminate your problem, call your servicing contractor.
Heat Pump Principle of Operation
f
1
WINTER HEATING
1. Outdoor air enters heat pump.
2. Cold, heat-transfer section (outdoor coil)
extracts heat from outdoor airas refrigerant
evaporates from a liquid to a gas.
3. Refrigerant, compressed to a hot gas by
heat pump, carries the heat to the hot heat-
transfer section (indoor coil).
4. Hot, heat-transfer section (indoor coil)
releases the heat to indoor air as refrigerant
condenses from a gas to a liquid.
5. Air handler circulates the heat throughout
the home.
6. Refrigerant returns to outdoor coil and
evaporates once again to absorb more
heat.
SUMMER COOLING
1. Indoor air enters the air handler section.
2. Cold, heat-transfer section (indoor coil)
extracts heat from indoor air as refrigerant
evaporates from a liquid to a cold gas.
3. Refrigerant, drawn to heat pump and
compressed to a hot gas by heat pump,
carries the heat outdoors.
4. Hot, heat-transfer section (outdoor coil)
releases the heat as refrigerant condenses
from a gas to a liquid.
5. Heat pump (outdoor fan) discharges the
heat to outside air.
6. Refrigerant returns to indoor coil and
evaporates once again to absorb more
heat.
OPERATING iNSTRUCTiONS
TO OPERATE YOUR HEAT PUMP
FOR COOLING
1. Set the thermostat system switch to COOL
and the thermostat fan switch to AUTO. (See
Figure 1)
.
Set the thermostat temperatu re tothe desired
temperature level using the temperature
selector. Please refer to the separate
detailed thermostat user's manual for
complete instructions regarding thermostat
programming. The outdoor unit and indoor
blower will both cycle on and off to maintain
the indoor temperatu re at the desired cooling
level.
NOTE: If the thermostat temperature level is
re-adjusted, or the thermostat system switch
is repositioned, the outdoor unit may not
start immediately. The outdoor unit contains
a protective timer circuit which holds the unit
off for approximately five minutes following a
previous operation, or the interruption of the
main electrical power.
TO OPERATE YOUR HEAT PUMP
FOR HEATING
.
Set the thermostat temperature to the
desired temperature level using the
temperature selector. Please refer to
the separate detailed thermostat user's
manual for complete instructions regarding
thermostat programming. The outdoor unit
and indoor blower will both cycle on and off
to maintain the indoor temperature at the
desired heating level.
NOTE: Ifthe thermostat temperature level is
re-adjusted, or the thermostat system switch
is repositioned, the outdoor unit may not
start immediately.The outdoor unit contains
a protective timer circuit which holds the unit
off for approximately five minutes following
a previous operation, or the interruption of
the main electrical power.
Emergency Heat:
The thermostat includes a system switch
position termed EM. HT. This is a back-up
heating mode to be used only if there is a
suspected problem with the outdoor unit.With
the system switch set to EM. HT.the outdoor
unit will be locked off, and supplemental heat
(typically electric resistance heating) will be
used as a source of heat. Sustained use of
electric resistance heat in place of the heat
pump will result in an increase in electric
utility costs.
1. Set the thermostat system switch to HEAT
and the thermostat fan switch to AUTO. (See
Figure 1)
/
FAN SWITCH SYSTEM SWITCH
Defrost:
During cold weather heating operation, the
outdoor unit will develop a coating of snow
and ice on the heat transfer coil. This is
Figure 1.Typical Thermostat
2
normal,andtheunitwillperiodicallydefrost
itself.Duringthedefrostcycle,theoutdoor
fanwillstop,andthecompressorwillcontinue
torunandheattheoutdoorcoil,causingthe
snowandicetomelt.Afterthesnowandice
havemelted,somesteammayrisefromthe
outdoorunitasthewarmcoilcausessome
meltedfrosttoevaporate.
TO OPERATEYOUR HEAT PUMP
FOR AUTOMATIC COOLING AND
HEATING--
1. Set the thermostat system switch to AUTO
and the thermostat fan switch to AUTO. (See
Figure 1)
Note: Thermostats will vary. Some models
will not include the AUTO mode, and others
will have the AUTO in place of the HEAT and
COOL, and some will include all three.
2_
Set the thermostat temperature to the
desired heating and cooling temperature
level(s). The outdoor unit and the indoor
blower will then cycle on and off in either
the heating or cooling mode of operation as
required to automatically maintain the indoor
temperature within the desired limits.
TO SHUT OFFYOUR HEAT
PUMP--
Set the thermostat system switch to OFF and the
thermostat fan switch to AUTO. (See Figure 1)
The system will not operate, regardless of the
thermostat temperature selector(s) setting.
TO MAINTAIN YOUR HEAT PUMP--
CAUTION:
Be certain the electrical power to
the outdoor unit and the furnace/air
handler is disconnected before
doing the following recommended
maintenance.
1. Regularly:
a_
Clean or replace the indoor air filter at the
start of each heating and cooling season,
and when an accumulation of dust and
dirt is visible on the air filter. Inspect the
filter monthly.
b_
Remove any leaves and grass clippings
from the coil in the outdoor unit, being
careful not to damage the aluminum
fins.
c_
Check for any obstruction such as twigs,
sticks, etc.
d_
Certain models have external panels
fabricated from a premium grade of
stainless steel designed to inhibit cor-
rosion. For such units, if the unit is
located in a coastal region or other area
subjected to high concentrations of salt,
then the unit should be hosed off after
storms and monthly otherwise to maintain
its new appearance.
CAUTION:
TO OPERATE THE INDOOR
BLOWER CONTINUOUSLY--
Set the thermostat fan switch to ON (See Figure
1).The indoor blower will start immediately, and
will run continually until the fan switch is reset
to AUTO.
The continuous indoor blower operation can be
obtained with the thermostat system switch set
in any position, including OFR
The continuous indoor blower operation is
typically used to circulate the indoor air to
equalize a temperature unbalance due to a sun
load, cooking, or fireplace operation.
Do not over-oil, or oil motors not
factory-equipped with oil tubes. The
compressor is hermetically "sealed"
and does not require lubrication.
2. Before Calling a Service Technician, Be
Certain:
a_
The unit thermostat is properly set--see
"To OperateYour Heat Pump for Cooling"
and "To Operate Your Heat Pump for
Heating."
b_
The unit disconnect fuses are in good
condition, and the electrical power to the
unit is turned on.
3
ReadYour Warranty
Please read the separate warranty document
completely. It contains valuable information
about your system.
GENERAL INFORMATION
Labels, Tags, Precautions -- When working
with this equipment, follow all precautions in the
literature, on tags, and on labels provided with
the equipment. Read and thoroughly understand
the instructionsprovided with the equipment prior
to performing the installation and operational
checkout of the equipment.
Read the following instructionscompletely before
performing the installation.
Outdoor Unit Section -- Each outdoor unit
is shipped with a refrigerant charge adequate
to operate the outdoor section with an indoor
matching coil or air handler. Units with braze
connections include the proper amount of
refrigerant for an additional 15 ft. of refrigerant
lines the same size as the valve fittings.
NOTE: DO NOT USE ANY PORTION OF
THE CHARGE FOR PURGING OR LEAK
TESTING.
Matching coils and air handlers may be shipped
with a small holding charge to pressurize them to
keep out contaminants.To release the pressure,
read the indoor section installation instructions
carefully.
Liquid and Suction Lines -- Fully annealed,
refrigerant grade copper tubing should be used
when installing the system. Refrigerant suction
line tubing should be fully insulated.
Field Connections for Electrical Power
Supply -- All wiring must comply with current
provisions of the "National Electrical Code"
(ANSI/NFPA 70) and with applicable local
codes having jurisdiction. The minimum size of
electrical conductors and circuit protection must
be in compliance with information listed on the
outdoor unit data label.
SAFETY CONSIDERATIONS
Pressures within the System -- Split
system heat pump equipment contains liquid
and gaseous refrigerant under pressure.
Installation and servicing of this equipment
should be accomplished by qualified, trained
personnel thoroughly familiar with this type of
equipment. Under no circumstances should the
Homeowner attempt to install and/or service
the equipment.
Brazing Operations-- Installation of equipment
may require brazing operations. Safety codes
must be complied with. Safety equipment (e.g.;
safety glasses, work gloves, fire extinguisher,
etc.) must be used when performing brazing
operations.
WARNING".
Ensure all electrical power to the unit
is off prior to installing or servicing the
equipment. Failure to do so may cause
personal injury or death.
SITE PREPARATION
Unpacking Equipment -- Remove the
cardboard carton and User's Manual from the
equipment. Take care to not damage tubing
connections when removing from the carton.
inspect for Damage -- Inspect the equipment
for damage prior to installing the equipment at
the job site. Ensure coil fins are straight and, if
necessary, comb fins to remove flattened and
bent fins.
Preferred Location of the Outdoor Unit at the
Job Site -- Conduct a survey of the job site to
determine the optimum location for mounting
the outdoor unit. Overhead obstructions,
poorly ventilated areas, and areas subject to
accumulation of debris should be avoided. The
outdoor unit should be installed no closer than
18 inches from the outside walls of the facility
and in an area free from overhead obstructions
to ensure unrestricted airflow through the
outdoor unit.
Facility Prerequisites -- Electrical power
supplied must be adequate for proper operation
of the equipment.The system must be wired and
provided with circuit protection in accordance
with local building codes and the National
Electrical Code.
iNSTALLiNG THE OUTDOOR UNiT
Slab Mount--The site selected for a slab mount
installation requires a stable foundation and one
not subject to erosion. The slab should be level
and anchored (if necessary) prior to placing the
equipment on the slab.
Cantilever Mount --The cantilever mount
should be designed with adequate safety factor
to support the weight of the equipment, and for
loads subjected to the mount during operation.
Installed equipment should be adequately
secured to the cantilever mount and levelled
prior to operation of the equipment.
Roof Mount --The method of mounting should
be designed so as not to overload roof structures
nor transmit noise to the interior of the structure.
Refrigerant and electrical line should be routed
through suitably waterproofed openings to
prevent water leaking into the structure.
INSTALLING THE INDOOR UNIT
The maximum recommended interconnecting
refrigerant line length is 75 feet, and the
vertical elevation difference between the indoor
and outdoor sections should not exceed 20
feet. Consult long line application guide for
installations in excess of these limits.
Filter Dryer Installation -- A filter dryer is
provided with PS series models only and must
be installed inthe liquid line of the system. If the
installation replaces a system with a filter dryer
already present in the liquid line, the filter dryer
must be replaced with the one supplied with the
unit. The filter dryer must be installed in strict
accordance with the manufacturer's installation
instructions.
For all other series models, installing a filter
dryer is optional. However, it is good installation
practice to install a filter dryer when replacing
the evaporator and/or condenser of a system.
When installing, the filter dryer must be installed
in strict accordance with the manufacturer's
installation instructions.
The indoor section should be installed before
proceeding with routing of refrigerant piping.
Consult the Installation Instructions of the indoor
unit (i.e.: air handler, furnace, etc.) for details
regarding installation.
CONNECTING REFRIGERANT
TUBING BETWEEN THE iNDOOR
AND OUTDOOR UNiT
General -- Once outdoor and indoor unit
placement has been determined, route refrigerant
tubing between the equipment inaccordance with
sound installation practices. Refrigerant tubing
should be routed in a manner that minimizes the
length of tubing and the number of bends in the
tubing. Refrigerant tubing should be supported
in a manner that the tubing will not vibrate or
abrade during system operation. Tubing should
be kept clean of foreign debris during installation
and installation of a liquid line filter drier is
recommended if cleanliness or adequacy of
system evacuation isunknown orcompromised.
Every effort should be made by the installer
to ensure that the field installed, refrigerant
containing components of the system have been
installed in accordance with these instructions
and sound installation practices so as to insure
reliable system operation and longevity.
Optional Equipment- Optional equipment
(e.g.: liquid line solenoid valves, etc.) should
be installed in strict accordance with the
manufacturer's installation instructions.
ELECTRICAL CONNECTIONS
WARNING:
Turn off all electrical power at the main
circuit box before wiring electrical
power to the outdoor unit. Failure to
comply may cause severe personnel
injury or death.
Wiring Diagram/Schematic -- A wiring
diagram/schematic islocated on the inside cover
of the electrical box of the outdoor unit. The
installer should become familiar with the wiring
diagram/schematic before making any electrical
connections to the outdoor unit.
Outdoor Unit Connections --The outdoor
unit requires both power and control circuit
electrical connections. Refer to the unit wiring
diagram/schematic for identification and location
of outdoor unit field wiring interfaces.
Control Circuit Wiring --The outdoor unit is
designed to operate from a 24VAC Class IIcontrol
circuit. Control circuit wiring must comply with
the current provisions of the "National Electrical
Code" (ANSI/N FPA 70) and with applicable focal
codes having jurisdiction.
Thermostat connections should be made in
accordance with the instructions supplied with
the thermostat, and with the instructions supplied
with the indoor equipment. A typical residential
installation with a heat pump thermostat and air
handler are shown below.
Electrical Power Wiring -- Electrical power
wiring must comply with the current provisions
of the "National Electrical Code" (ANSI/NFPA
70) and with applicable local codes having
jurisdiction. Use of rain tight conduit is
recommended. Electrical conductors shall have
minimum circuit ampacity incompliance with the
outdoor unit rating label.The facility shall employ
electrical circuit protection at a current rating no
greater than that indicated on the outdoor unit
rating label. Refer to the unit wiring diagram for
connection details.
Maximum Fuse/Circuit Breaker Size-- Circuit
protection for the outdoor unit must be compatible
with the maximum fuse/circuit breaker size listed
on the outdoor unit data label.
Disconnect Switch--An elect rically compatible
disconnect switch must be within line of sight of
the outdoor unit. This switch shall be capable of
electrically de-energizing the outdoor unit.
Optional Equipment -- Optional equipment
requiring connection to the power or control
circuits must be wired in strict accordance with
current provisions of the "National Electrical
Code" (ANSI/NFPA 70), with applicable local
codes having jurisdiction, and the installation
instructions provided with the equipment.
Optional Equipment (e.g.: liquid line solenoid
valves, hard start kits, low suction pressure
cutout switch kit, high pressure cutout switch kit,
refrigerant compressor crankcase heater, etc.)
should be installed instrict accordance with the
manufacturer's installation instructions.
STARTUP AND CHECKOUT
Minimum Circuit Ampacity-- Electrical wiring
to the equipment must be compatible and in
compliance with the minimum circuit ampacity
listed on the outdoor unit data label.
COPPER WiRE SiZE i AWG
(1% Voltage Drop)
Supply Wire Length-Feet Supply Circuit
200 150 100 50 Ampacity
6 8 10 14 15
4 6 8 12 20
4 6 8 10 25
4 4 6 10 30
3 4 6 8 35
3 4 6 8 40
2 3 4 6 45
2 3 4 6 50
Wire Size based on N.E.C. for 60° type copper
conductors.
WARNING:
Ensure electrical power to the unit is
off prior to performing the following
steps. Failure to do so may cause
personal injury or death.
Air FHters -- Ensure air filters are clean and in
place prior to operating the equipment.
Thermostat-- Set the room the rmostat function
switch to OFF, fan switch to AUTO, and adjust the
temperature setpoint to its highest setting.
Prior to applying electrical power to the outdoor
unit, ensure that the unit has been properly and
securely grounded, and that power supply
connections have been made at both the facility
power interface and outdoor unit.
Outdoor Unit -- Ensure the outdoor coil and
top of the unit are free from obstructions and
debris, and all equipment access/control panels
are in place.
Using extreme caution, apply power to the unit
and inspect the wiring for evidence of open,
shorted, and/or improperly wired circuits.
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Air Handier
Typical Heat Pump with Standard Air Handier
A typical installation with a heat pump thermostat, air handler, and heat pump with an outdoor
thermostat.
Thermostat ]
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Air Handier
Heat Pump OD
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Typical Heat Pump with
OutdoorThermostat and Air Handier
Functional Checkout:
CAUTION:
NOTE: This module does not provide safety
protection! The Comfort Alert TM module is a
monitoring device and cannot shut down the
compressor directly.
if equipped with a compressor
crankcase heater, wait 24 hours prior
to performing a function checkout to
allow for heating of the compressor
crankcase. Failure to comply may
result in damage and could cause
premature failure of the system.
Indoor Blower -- Set the thermostat function
switch to COOLING and the fan switch to ON.
Verify that the indoor blower is operating and
that airflow is not restricted. Set the fan switch
back to AUTO.
Positive Temperature Coefficient Resistor
(PTCR) -- (select models) A PTCR is factory
installed and located on the control panel of the
outdoor unit. The PTCR is a soft start device for
use with reciprocating compressors. If a hard
start kit is needed on this model the soft start
(PTCR) must be removed first.
Low=Pressure Switch -- A low-pressure
switch is factory-installed in select models only.
If provided, this switch is located in the suction
line internal to the outdoor unit. The switch is
designed to protect the compressor from a loss
of charge. Under normal conditions, the switch
is closed. If the suction pressure falls below 5
psig, then the switch will open and de-energize
the outdoor unit. The switch will close again
once the suction pressure increases above 20
psig. Please note that the switch interrupts the
thermostat inputs to the unit. Thus, when the
switch opens and then closes, there will be a 5
minute short cycling delay before the outdoor
unit will energize.
Comfort Alert TM Diagnostics (Select Models)
-- The Comfort Alert TM diagnostics module is
a breakthrough innovation for troubleshooting
heat pump and air conditioning system failures.
The module installs easily in the electric box of
the outdoor unit near the compressor contac-
tot. By monitoring and analyzing data from the
Copeland Scroll compressor® and the thermo-
stat demand, the module can accurately detect
the cause of electrical and system related failures
without any sensors. A flashing LED indicator
communicates the ALERT code and guides the
service technician more quickly and accurately
to the root cause of a problem.
LED Description (See Figure 2)
POWER LED (Green): indicates voltage
is present at the power connection of the
module.
ALERT LED (Yellow): communicates an
abnormal system condition through a unique
flash code.The ALERT LED will flash a number
of times consecutively, pause and then repeat
the process. The number of consecutive
flashes, defined as the Flash Code, correlates
to a particular abnormal condition. Detailed
descriptions of specific ALERT Flash Codes are
shown inTable 1 of this manual.
TRIP LED (Red): indicates there is a demand
signal from the thermostat but no current to the
compressoris detected bythe module.TheTRIP
LED typically indicatesthe compressor protector
is open or may indicate missing supply power
to the compressor.
The scroll compressor's run (R), common (C) and
start (S) wires are routed through the holes inthe
Comfort AlertTM module marked "R,'"C" and "S."
The common (C) wire need not be routed through
the module for it to operate properly.
24 VAC Power Wiring -- The Comfort Alert TM
module requires a constant nominal 24 VAC
power supply.The wiring to the module's R and
C terminals must be directly from the indoor unit
or thermostat.
XI
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Figure 2. Comfort Alert TM Diagnostics
Module
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LOW Voltage
Terminals
Figure 3.24VAC Comfort Alert TM
The module cannot be powered by the C terminal
on adefrost board or other control board without
experiencing nuisance alerts.
NOTE: After the thermostat demand signal is
connected, verify that 24 VAC across Y and
C when demand is present.
NOTE: Factory installed modules may have
different thermostat demand signal wiring.
Follow manufacturer's wiring instructions
when replacing module.
TROUBLESHOOTING
interpreting The Diagnostic LEDs - When
an abnormal system condition occurs, the
Comfort Alert TM module displays the appropriate
ALERT and/orTRIP LED will flash a number of
times consecutively, pause and then repeat the
process.To identify a Flash Code number, count
the number of consecutive flashes.
LPS HPS Defrost Control Board
Wiring Diagram
the thermostat to its original setting and verify
that the indoor blower is energized and that the
outdoor unit remains de-energized. Verify that,
after approximately 5 minutes, the outdoor unit
energizes and that the temperature of the air
supplied to the facility is cooler than ambient
temperature.
Heating -- Lower the thermostat setpoint
temperature to the lowest obtainable setting and
set the thermostat function switch to HEATING.
The indoor blower and outdoor unit should stop
running.After a minimum of five minutes, increase
the setpoint temperature of the thermostat to the
maximum setting.Verify that the outdoor unit and
indoor blower have energized. Feel the air being
circulated by the indoor blower and verify that
it is warmer than ambient temperature. Listen
for any unusual noises. If present, locate and
determine the source of the noise and correct
as necessary.
NOTE: Other sources for heating (i.e.: electric
furnace, fossil fuel furnace, air handler with
electric heat options, etc.) that interface with
the unit should be functionally checked to verify
system operation and compatibility. Refer to the
installation instructions for this equipment and
perform a functional checkout in accordance
with the manufacturer's instructions.
OUTDOOR THERMOSTAT (if supplied)
The outdoor thermostat prevents the electrical
auxiliary heat (if used) from operating above a
desired set point. Selection of the set point is
determined from the building design heat load.
Every time the module powers up, the last ALERT
Flash Code that occurred prior to shut down is
displayed for one minute.
Cooling -- Gradually lower the thermostat
temperature setpoint below the actual room
temperature and observe that the outdoor unit
and indoor blower energize. Feel the air being
circulated by the indoor blower and verify that
it is cooler than ambient temperature. Listen
for any unusual noises. If present, locate and
determine the source of the noise and correct
as necessary.
Short Cycle Protection -- With the system
operating in COOLING mode, note the setpoint
temperature setting of the thermostat, and
gradually raise the setpoint temperature until
the outdoor unit and indoor blower de-energize.
Immediately lower the setpoint temperature of
The thermostat is adjustable from 45°F to 0°R
The factory temperature setting is at 40°R
Defrost CycleTimer --The defrost cycle timer
controls the time interval of the hot gas defrost
after the defrost sensor closes. It is located
in the lower left corner of the defrost control
board. Three interval settings are available: 30
minutes, 60 minutes, and 90 minutes.Time setting
selection is dependent on the climate where the
unit is being installed.
Example 1. Dry climate of Southern
Arizona. A 90 minute setting is
recommended.
Example 2. Moist climate of Seattle,
Washington. A 30 minute setting is
recommended.
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Green"POWER"
Red"TRIP"
Yellow"ALERT"
FlashCode1
Yellow"ALERT"
FlashCode2
Yellow"ALERT"
FlashCode3
Yellow"ALERT"
FlashCode5
Yellow"ALERT"
FlashCode6
Yellow"ALERT"
FlashCode7
YeIIow"ALERT" WeldedContoctor
FlashCede8 Compressoralwaysruns
Yellow"ALERT" LewVoltage
FlashCede9 Controlcircuit<17VAC
Modulehaspower
Thermostatdemandsignal
Yispresent,butthe 2.
compressorisnot 3.
running 4.
LongRnnTime 1.
Compressoris 2.
runningextremely 3.
longruncycles 4.
SystemPressureTrip 1.
Dischargeorsuction 2.
pressureoutoflimitsor 3.
compressoroverloaded 4.
ShortCycling
Compressorisrunning
onlybriefly
LockedRotor
OpenCircuit
OpenStartCircuit 1.
Currentonlyinruncircuit 2.
OpenRanCircuit 1.
Currentonlyinstartcircuit
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Supplyvoltageis presentatmoduleterminals
1. Compressorprotectorisopen
Outdoorunitpowerdisconnectisopen
Compressorcircuitbreakerorfuse(s)isopen
Brokenwireorconnectorisnotmakingcontact
5.
Lowpressureswitchopenifpresentinsystem
6.
Compressorcontactorhasfailedopen
Lowrefrigerantcharge
Evaporatorblowerisnotrunning
Evaporatorcoilisfrozen
Faultymeteringdevice
5.
Condensercoilisdirty
6.
Liquidlinerestriction(filterdrierblockedifpresentinsystem)
7.
Thermostatismalfunctioning
8.
ComfortAlertFailure
9.
ComfortAlertFailure
Highheadpressure
Condensercoil poorair circulation(dirty, blocked,damaged)
Condenserfanisnotrunning
Returnair ducthassubstantialleakage
5.
Iflowpressureswitchpresentinsystem,checkFlash
Code1information
1.Thermostatdemandsignalisintermittent
2.Timedelayrelayorcontrolboarddefective
3.IfhighpressureswitchpresentgotoFlashCode2information
4.IflowpressureswitchpresentgotoFlashCode1information
1. Runcapacitorhasfailed
2. Lowlinevoltage(contactutilityifvoltageatdisconnectislow)
,, Checkwiringconnections
3. Excessiveliquidrefrigerantincompressor
4. Compressorbearingsareseized
,, Measurecompressoroillevel
1. Outdoorunitpowerdisconnectisopen
2. Compressorcircuitbreakerorfuse(s)isopen
3.Compressorcontactorhasfailedopen
* Checkcompressorcontactorwiringandconnectors
o Checkforcompressorcontactorfailure(burned,pittedor
open)
,, Checkwiringandconnectorsbetweensupplyand
compressor
,, Checkforlowpilotvoltageatcompressorcontactorcoil
4.
Highpressureswitchisopenandrequiresmanualreset
5.
Opencircuitincompressorsupplywiringorconnections
6.
Unusuallylongcompressorprotectorresettimedueto
extremeambienttemperature
7.
Compressorwindingsaredamaged
,, Checkcompressormotorwindingresistance
Runcapacitorhasfailed
Opencircuitincompressorstartwiringorconnections
o Checkwiringandconnectorsbetweensupplyandthe
compressor"S"terminal
3.
Compressorstartwindingisdamaged
* Checkcompressormotorwindingresistance
Opencircuitincompressorrunwiringorconnections
,, Checkwiringandconnectorsbetweensupplyandthe
compressor"R'terminal
2. Compressorrunwindingisdamaged
,, Checkcompressormotorwindingresistance
1. Compressorcontactorhasfailedclosed
2. Thermostatdemandsignalnotconnectedtomodule
1. Controlcircuittransformerisoverloaded
2. Lowlinevoltage(contactutilityifvoltageatdisconnectislow)
,, Checkwiringconnections
10
Flash Code number corresponds to a number of LED flashes followed by a pause and then repeated
TRIP and ALERTLFDe flashing at same time means control circuit vollage is too low for operation
Table 1. interpreting the Diagnostic LEDS
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