I
MPORTANT
S
AFETY
I
NSTRUCTIONS
The following symbols and labels are used throughout this
manual to indicate immediate or potential safety hazards. It is
the owner’s and installer’s responsibility to read and comply with
all safety information and instructions accompanying these sym-
bols. Failure to heed safety information increases the risk of
personal injury, property damage, and/or product damage.
HIGH VOLTAGE !
D
ISCONNECT
ALL
POWER
BEFORE
SERVICING
.
M
ULTIPLE
POWER
SOURCES
MAY
BE
PRESENT
. F
AILURE
TO
DO
SO
MAY
CAUSE
PROPERTY
DAMAGE
,
PERSONAL
INJURY
OR
DEATH
.
WARNING
O
NLY
PERSONNEL
THAT
HAVE
BEEN
TRAINED
TO
INSTALL
,
ADJUST
,
SERVICE
OR
REPAIR
(
HEREINAFTER
, “
SERVICE
”)
THE
EQUIPMENT
SPECIFIED
IN
THIS
MANUAL
SHOULD
SERVICE
THE
EQUIPMENT
. T
HE
MANUFACTURER
WILL
NOT
BE
RESPONSIBLE
FOR
ANY
INJURY
OR
PROPERTY
DAMAGE
ARISING
FROM
IMPROPER
SERVICE
OR
SERVICE
PROCEDURES
. I
F
YOU
SERVICE
THIS
UNIT
,
YOU
ASSUME
RESPONSIBILITY
FOR
ANY
INJURY
OR
PROPERTY
DAMAGE
WHICH
MAY
RESULT
. I
N
ADDITION
,
IN
JURISDICTIONS
THAT
REQUIRE
ONE
OR
MORE
LICENSES
TO
SERVICE
THE
EQUIPMENT
SPECIFIED
IN
THIS
MANUAL
,
ONLY
LICENSED
PERSONNEL
SHOULD
SERVICE
THE
EQUIPMENT
. I
MPROPER
INSTALLATION
,
ADJUSTMENT
,
SERVICING
OR
REPAIR
OF
THE
EQUIPMENT
SPECIFIED
IN
THIS
MANUAL
,
OR
ATTEMPTING
TO
INSTALL
,
ADJUST
,
SERVICE
OR
REPAIR
THE
EQUIPMENT
SPECIFIED
IN
THIS
MANUAL
WITHOUT
PROPER
TRAINING
MAY
RESULT
IN
PRODUCT
DAMAGE
,
PROPERTY
DAMAGE
,
PERSONAL
INJURY
OR
DEATH
.
HEAT PUMP UNIT
AVZC20 HEAT PUMP
INSTALLATION & SERVICE REFERENCE
Index
All information contained herein is subject to change without notice.
© 2015 - 2016 Goodman Manufacturing Company, L.P.
5151 San Felipe St., Suite 500, Houston, TX 77056
www.amana-hac.com
is a registered trademark of Maytag Corporation or its related companies and is used under license. All rights reserved.
IOA-4013C
8/2016
IMPORTANT SAFETY INSTRUCTIONS .......................................... 1
SHIPPING INSPECTION ............................................................ 2
CODES & REGULATIONS ........................................................ 2
FEATURES ............................................................................ 2
INSTALLATION CLEARANCES.................................................... 2
ROOFTOP INSTALLATIONS ........................................................ 3
SAFE REFRIGERANT HANDLING ............................................... 3
REFRIGERANT LINES .............................................................. 3
REFRIGERANT LINE CONNECTIONS........................................... 5
LEAK TESTING (NITROGEN OR NITROGEN-TRACED) ................... 5
SYSTEM START-UP PROCEDURE.............................................. 5
ELECTRICAL CONNECTIONS .................................................... 6
HEAT PUMP ADVANCED FEATURE MENU ............................... 22
WIRING DIAGRAM ............................................................... 25
CAPACITOR ........................................................................ 28
TROUBLESHOOTING .............................................................. 33
SETTING THE MODE DISPLAY ............................................... 38
7-SEGMENT DISPLAY ........................................................... 44
START-UP CHECKLIST .......................................................... 47
“IMPORTANT – THIS PRODUCT HAS BEEN DESIGNED AND MANUFACTURED TO MEET ENERGY STAR CRITERIA FOR
ENERGY EFFICIENCY WHEN MATCHED WITH APPROPRIATE COIL COMPONENTS. HOWEVER, PROPER REFRIGERANT CHARGE
AND PROPER AIR FLOW ARE CRITICAL TO ACHIEVE RATED CAPACITY AND EFFICIENCY. INSTALLATION OF THIS PRODUCT SHOULD
FOLLOW THE MANUFACTURER’S REFRIGERANT CHARGING AND AIR FLOW INSTRUCTIONS. FAILURE TO CONFIRM PROPER
CHARGE AND AIRFLOW MAY REDUCE ENERGY EFFICIENCY AND SHORTEN EQUIPMENT LIFE.”
2
T
HE
UNIT
HAS
ITS
OWN
P
UMP
-
DOWN
MODE
. U
SE
THE
P
UMP
-
DOWN
MODE
WHILE
VACUUMING
THE
UNIT
. V
ACUUMING
TOO
LOW
CAN
CAUSE
INTERNAL
ELECTRICAL
ARCING
,
RESULTING
IN
A
DAMAGED
OR
FAILED
COMPRESSOR
.
CAUTION
S
HIPPING
I
NSPECTION
Always keep the unit upright; laying the unit on its side or top
may cause equipment damage. Shipping damage, and subsequent
investigation is the responsibility of the carrier. Verify the model
number, specifications, electrical characteristics, and accessories
are correct prior to installation. The distributor or manufacturer
will not accept claims from dealers for transportation damage or
installation of incorrectly shipped units.
C
ODES
& R
EGULATIONS
This product is designed and manufactured to comply with na-
tional codes. Installation in accordance with such codes and/or
prevailing local codes/regulations is the responsibility of the in-
staller. The manufacturer assumes no responsibility for equip-
ment installed in violation of any codes or regulations. Rated
performance is achieved after 72 hours of operation. Rated per-
formance is delivered at the specified airflow. See outdoor unit
specification sheet for split system models or product specifica-
tion sheet for packaged and light commercial models. Specifica-
tion sheets can be found at www.amana-hac.com for Amana®
brand products. Within the website, please select the residen-
tial or commercial products menu and then select the submenu
for the type of product to be installed, such as air conditioners
or heat pumps, to access a list of product pages that each con-
tain links to that model’s specification sheet.
The United States Environmental Protection Agency (EPA) has
issued various regulations regarding the introduction and dis-
posal of refrigerants. Failure to follow these regulations may
harm the environment and can lead to the imposition of sub-
stantial fines. Should you have any questions please contact the
local office of the EPA.
If replacing a condensing unit, heat pump or air handler, the sys-
tem must be manufacturer approved and Air Conditioning, Heat-
ing and Refrigeration Institute (AHRI) matched.
NOTE: The installation of an inverter heat pump with unmatched
system units will not allow for proper operation.
I
NVERTER
A/H
MODELS
CAN
ONLY
BE
MATCHED
WITH
AN
AV**PVC
AIR
HANDLER
OR
TXV-V**
EXPANSION
VALVE
KIT
. D
AMAGE
RESULTING
FROM
OPERATION
WITH
ANY
OTHER
COMBINATION
IS
NOT
COVERED
BY
OUR
WARRANTIES
.
NOTICE
Outdoor inverter units are approved for operation above 0°F in
cooling mode and -20°F (RH10%) in heating mode with no addi-
tional kit necessary.
Damage resulting from operation of the units in a structure that
is not complete (either as port of new construction or renova-
tion) is not covered by our warranties.
F
EATURES
This heat pump is part of a system that uses inverter technology to
more efficiently remove or add heat with better efficiency and
achieve the target comfort conditions. System may ONLY be in-
stalled using a ComfortNet™ thermostat with model number
CTK04 as part of the digital communicating system. The
ComfortNet system reduces the number of required thermostat
wires, provides additional setup features and enhanced active
diagnostics. Due to components using inverter technology, the
heat pump will not function properly if used with a CTK03, 02 or
01 ComfortNet thermostat.
N
OT
APPROVED
FOR
USE
WITH
A
CTK01, CTK02
OR
CTK03.
NOTICE
I
NSTALLATION
C
LEARANCES
Special consideration must be given to location of the heat pump
unit(s) in regard to structures, obstructions, other units, and any/
all other factors that may interfere with air circulation. Where
possible, the top of the unit should be completely unobstructed;
however, if vertical conditions require placement beneath an ob-
struction there should be a minimum of 60 inches between the
top of the unit and the obstruction(s). The specified dimensions
meet requirements for air circulation only. Consult all appropri-
ate regulatory codes prior to determining final clearances.
Another important consideration in selecting a location for the
unit(s) is the angle to obstructions. Either side adjacent the valves
can be placed toward the structure provided the side away from
the structure maintains minimum service clearance. Corner in-
stallations are strongly discouraged.
OK!
OK!
AA AAA
A
CC
CCOK!
OK!
OK!
OK!
NOT
RECOMMENDED
AA
AA AA
AA
AA
B B B
B
Model Type A B C AA
Residential 10" 10" 18" 20"
Light Commercial 12" 12" 18" 24"
Minimum Airflow Clearance
This unit can be located at ground floor level or on flat roofs. At
ground floor level, the unit must be on a solid, level foundation
3
that will not shift or settle. To reduce the possibility of sound
transmission, the foundation slab should not be in contact with
or be an integral part of the building foundation. Care should be
taken to ensure the unit is installed away from noise sensitive
locations such as bedrooms, windows and outdoor living areas.
Ensure the foundation is sufficient to support the unit. A con-
crete slab raised above ground level provides a suitable base.
R
OOFTOP
I
NSTALLATIONS
If it is necessary to install this unit on a roof structure, ensure
the roof structure can support the weight and that proper con-
sideration is given to the weather-tight integrity of the roof. Since
the unit can vibrate during operation, sound vibration transmis-
sion should be considered when installing the unit. Vibration ab-
sorbing pads or springs can be installed between the heat pump
unit legs or frame and the roof mounting assembly to reduce
noise vibration.
ELECTRICAL N OISE
The unit should be well grounded so that potential effects of
electrical noise from the inverter to surrounding equipment can
be minimized.
When selecting an installation location, keep sufficient distance
from the heat pump unit and wiring to radios, personal comput-
ers, stereos, etc., as shown in the following figure.
Circuit
Breaker
(In.)
Radio, TV
60” or more
To Indoor Unit and Thermostat
60” or more
Placement to Minimize Electronic Noise
S
AFE
R
EFRIGERANT
H
ANDLING
While these items will not cover every conceivable situation, they
should serve as a useful guide.
T
O
AVOID
POSSIBLE
INJURY
,
EXPLOSION
OR
DEATH
,
PRACTICE
SAFE
HANDLING
OF
REFRIGERANTS
.
WARNING
T
O
AVOID
POSSIBLE
EXPLOSION
,
USE
ONLY
RETURNABLE
(
NOT
DISPOSABLE
)
SERVICE
CYLINDERS
WHEN
REMOVING
REFRIGERANT
FROM
A
SYSTEM
.
• E
NSURE
THE
CYLINDER
IS
FREE
OF
DAMAGE
WHICH
COULD
LEAD
TO
A
LEAK
OR
EXPLOSION
.
• E
NSURE
THE
HYDROSTATIC
TEST
DATE
DOES
NOT
EXCEED
5
YEARS
.
• E
NSURE
THE
PRESSURE
RATING
MEETS
OR
EXCEEDS
400
PSIG
.
W
HEN
IN
DOUBT
,
DO
NOT
USE
CYLINDER
.
WARNING
R
EFRIGERANTS
ARE
HEAVIER
THAN
AIR
. T
HEY
CAN
“
PUSH
OUT
”
THE
OXYGEN
IN
YOUR
LUNGS
OR
IN
ANY
ENCLOSED
SPACE
. T
O
AVOID
POSSIBLE
DIFFICULTY
IN
BREATHING
OR
DEATH
:
• N
EVER
PURGE
REFRIGERANT
INTO
AN
ENCLOSED
ROOM
OR
SPACE
. B
Y
LAW
,
ALL
REFRIGERANTS
MUST
BE
RECLAIMED
.
• I
F
AN
INDOOR
LEAK
IS
SUSPECTED
,
THOROUGHLY
VENTILATE
THE
AREA
BEFORE
BEGINNING
WORK
.
• L
IQUID
REFRIGERANT
CAN
BE
VERY
COLD
. T
O
AVOID
POSSIBLE
FROST
BITE
OR
BLINDNESS
,
AVOID
CONTACT
AND
WEAR
GLOVES
AND
GOGGLES
. I
F
LIQUID
REFRIGERANT
DOES
CONTACT
YOUR
SKIN
OR
EYES
,
SEEK
MEDICAL
HELP
IMMEDIATELY
.
• A
LWAYS
FOLLOW
EPA
REGULATIONS
. N
EVER
BURN
REFRIGERANT
,
AS
P
OISONOUS
GAS
WILL
BE
PRODUCED
.
WARNING
T
O
AVOID
POSSIBLE
EXPLOSION
:
•N
EVER
APPLY
FLAME
OR
STEAM
TO
A
REFRIGERANT
CYLINDER
. I
F
YOU
MUST
HEAT
A
CYLINDER
FOR
FASTER
CHARGING
,
PARTIALLY
IMMERSE
IT
IN
WARM
WATER
.
•N
EVER
FILL
A
CYLINDER
MORE
THAN
80%
FULL
OF
LIQUID
REFRIGERANT
.
•N
EVER
ADD
ANYTHING
OTHER
THAN
R-410A
TO
A
RETURNABLE
R-410A
CYLINDER
. T
HE
SERVICE
EQUIPMENT
USED
MUST
BE
LISTED
OR
CERTIFIED
FOR
THE
TYPE
OF
REFRIGERANT
USE
.
•S
TORE
CYLINDERS
IN
A
COOL
,
DRY
PLACE
. N
EVER
USE
A
CYLINDER
AS
A
PLATFORM
OR
A
ROLLER
.
WARNING
R
EFRIGERANT
L
INES
T
HE
COMPRESSOR
PVE
OIL
FOR
R-410A
UNITS
IS
EXTREMELY
SUSCEPTIBLE
TO
MOISTURE
ABSORPTION
AND
COULD
CAUSE
COMPRESSOR
FAILURE
. D
O
NOT
LEAVE
SYSTEM
OPEN
TO
ATMOSPHERE
ANY
LONGER
THAN
NECESSARY
FOR
INSTALLATION
.
CAUTION
Use only refrigerant grade (dehydrated and sealed) copper tubing
to connect the heat pump unit with the indoor unit. After cutting
the tubing, install plugs to keep refrigerant tubing clean and dry
prior to and during installation. Tubing should always be cut
square keeping ends round and free from burrs. Clean the tubing
to prevent contamination. The liquid line must be insulated if
more than 50 ft. of liquid line will pass through an area that may
reach temperatures of 30 °F or higher than ambient in cooling
4
Heat Pump ABOVE Indoor Coil
Maximum vertical
separation of 200 ft.
*Includes pressure losses of any elbow, bends, etc.
Maximum line set
equivalent length of 250 ft.*
The maximum line set
actual length is 200 ft.
mode and/or if the temperature inside the conditioned space may
reach a temperature lower than ambient in heating mode. Never
attach a liquid line to any uninsulated potion of the gas line.
Do NOT let refrigerant lines come in direct contact with plumbing,
ductwork, floor joists, wall studs, floors, and walls. When run-
ning refrigerant lines through a foundation or wall, openings
should allow for sound and vibration absorbing material to be
placed or installed between tubing and foundation. Any gap be-
tween foundation or wall and refrigerant lines should be filled
with a pliable silicon-based caulk, RTV or a vibration damping
material. Avoid suspending refrigerant tubing from joists and
studs with rigid wire or straps that would come in contact with
the tubing. Use an insulated or suspension type hanger. Keep
both lines separate and always insulate the gas line.
Insulation is necessary to prevent condensation from forming
and dropping from the gas line. Armflex or satisfactory equiva-
lent with 3/8” min. wall thickness is recommended. In severe
conditions (hot, high humidity areas) 1/2” insulation may be re-
quired. Insulation must be installed in a manner which protects
tubing and connections from damage and contamination.
Where possible, drain as much residual compressor oil from ex-
isting systems, lines, and traps; pay close attention to low areas
where oil may collect. NOTE: If changing refrigerant, the indoor
coil and metering device must be replaced. Only AV**PVC air
handlers or TXV** expansion valves are compatible and have been
manufacturer approved for use with these models. See unit speci-
fications or AHRI for an approved system match.
Oil Trap Construction
LONG RADIUS
STREET ELL
SHORT RADIUS
STREET ELL
STREET
ELL
Heat Pump BELOW Indoor Coil
Maximum line set
equivalent length of 250 ft*.
The maximum line set actual length is 200 ft.
*Includes pressure losses of any elbow, bends, etc.
5
Line Set Length
(Tons) Suct Liq
23/43/8
37/83/8
41 1/83/8
51 1/83/8
RECOMMENDED
INTERCONNECTING TUBING (Ft)
0 - 250' Equivalent
Heat Pump
Unit Line Type
& Line Diameter (In. OD)
R
EFRIGERANT
L
INE
C
ONNECTIONS
IMPORTANT
To avoid overheating the service valve, TXV or filter drier
while brazing, wrap the component with a wet rag, or use a
thermal heat trap compound. Be sure to follow the
manufacturer’s instruction when using the heat trap
compound. Note: Remove Schrader valves from service
valves before brazing tubes to the valves. Use a brazing alloy
of 2% minimum silver content. Do not use flux.
Torch heat required to braze tubes of various sizes is
proportional to the size of the tube. Tubes of smaller size
require less heat to bring the tube to brazing temperature
before adding brazing alloy. Applying too much heat to any
tube can melt the tube. Service personnel must use the
appropriate heat level for the size of the tube being brazed.
NOTE: The use of a heat shield when brazing is recommended
to avoid burning the serial plate or the finish on the unit.
1. The ends of the refrigerant lines must be cut square,
deburred, cleaned, and be round and free from nicks or
dents. Any other condition increases the chance of a
refrigerant leak.
2. “Sweep” the refrigerant line with nitrogen or inert gas
during brazing to prevent the formation of copper-oxide
inside the refrigerant lines. The FVC oils used in R-410A
applications will clean any copper-oxide present from the
inside of the refrigerant lines and spread it throughout
the system. This may cause a blockage or failure of the
metering device.
3. After brazing, quench the joints with water or a wet cloth
to prevent overheating of the service valve.
4. A bi-flow filter drier is shipped with the unit as a separate
component and must be brazed on by the installer on-
site. Ensure the bi-flow filter drier paint finish is intact after
brazing. If the paint of the steel filter drier has been
burned or chipped, repaint or treat with a rust
preventative.
The recommended location of the filter drier is before the
expansion device at the indoor unit.
NOTE: Be careful not to kink or dent refrigerant lines. Kinked or
dented lines will cause poor performance or compressor damage.
Do NOT make final refrigerant line connection until plugs are
removed from refrigerant tubing.
L
EAK
T
ESTING
(N
ITROGEN
OR
N
ITROGEN
-T
RACED
)
T
O
AVOID
THE
RISK
OF
FIRE
OR
EXPLOSION
,
NEVER
USE
OXYGEN
,
HIGH
PRESSURE
AIR
OR
FLAMMABLE
GASES
FOR
LEAK
TESTING
OF
A
REFRIGERATION
SYSTEM
.
WARNING
T
O
AVOID
POSSIBLE
EXPLOSION
,
THE
LINE
FROM
THE
NITROGEN
CYLINDER
MUST
INCLUDE
A
PRESSURE
REGULATOR
AND
A
PRESSURE
RELIEF
VALVE
. T
HE
PRESSURE
RELIEF
VALVE
MUST
BE
SET
TO
OPEN
AT
NO
MORE
THAN
150
PSIG
.
WARNING
To locate leaks, pressure test the system using dry nitrogen or
leak detector fluid per the manufacturer’s recommendation. If
you wish to use a leak detector, charge the system to 10 psi us-
ing the appropriate refrigerant then use nitrogen to finish charg-
ing the system to working pressure then apply the detector to
suspect areas. If leaks are found, repair them. After repair, re-
peat the pressure test. If no leaks exist, proceed to System Start-
up Procedure.
S
YSTEM
S
TART
-
UP
P
ROCEDURE
GENERAL NOTES:
Adequate refrigerant charge for the matching indoor coil and 15
feet of line set is supplied with the heat pump unit. If liquid line
set exceeds 15 feet in length, refrigerant should be added at 0.6
ounces per foot of liquid line.
V
IOLATION
OF
EPA
REGULATIONS
MAY
RESULT
IN
FINES
OR
OTHER
PENALTIES
.
NOTICE
A
LL
UNITS
SHOULD
HAVE
A
HIGH
VOLTAGE
POWER
SUPPLY
CONNECTED
2
HOURS
PRIOR
TO
STARTUP
.
NOTICE
REFRIGERANT UNDER PRESSURE!
• D
O
NOT
OVERCHARGE
SYSTEM
WITH
REFRIGERANT
.
• D
O
NOT
OPERATE
UNIT
IN
A
VACUUM
OR
AT
NEGATIVE
PRESSURE
.
F
AILURE
TO
FOLLOW
PROPER
PROCEDURES
MAY
CAUSE
PROPERTY
DAMAGE
,
PERSONAL
INJURY
OR
DEATH
.
WARNING
O
PERATING
THE
COMPRESSOR
WITH
THE
GAS
VALVE
CLOSED
WILL
CAUSE
SERIOUS
COMPRESSOR
DAMAGE
-
SUCH
DAMAGE
IS
NOT
COVERED
BY
OUR
WARRANTIES
.
CAUTION
6
U
SE
REFRIGERANT
CERTIFIED
TO
AHRI
STANDARDS
. U
SED
REFRIGERANT
MAY
CAUSE
COMPRESSOR
DAMAGE
,
AND
THE
WARRANTY
. M
OST
PORTABLE
MACHINES
CANNOT
CLEAN
USED
REFRIGERANT
TO
MEET
AHRI
STANDARDS
.
IS
NOT
COVERED
UNDER
CAUTION
START-UP PROCEDURE DETAIL
Liquid and gas valves on heat pump unit are closed to contain the
charge within the unit. The unit is shipped with the valve stems
closed and caps installed. Do not open valves until the indoor coil
and line set is evacuated.
P
ROLONGED
OPERATION
AT
SUCTION
PRESSURES
LESS
THAN
20
PSIG
FOR
MORE
THAN
5
SECONDS
WILL
RESULT
IN
OVERHEATING
OF
THE
SCROLLS
AND
PERMANENT
DAMAGE
TO
THE
SCROLL
TIPS
,
DRIVE
BEARINGS
AND
INTERNAL
SEAL
.
CAUTION
1. Connect the vacuum pump with 250 micron capability to
the service valves.
2. Evacuate the system to 250 microns or less using gas and
liquid service valves. Using both valves is necessary as
some compressors create a mechanical seal separating the
sides of the system.
3. Close pump valve and hold vacuum for 10 minutes.
Typically pressure will rise during this period.
• If the pressure rises to 1000 microns or less and remains
steady the system is considered leak-free; proceed to
start-up.
• If pressure rises above 1000 microns but holds steady
below 2000 microns, moisture and/or noncondensibles
may be present or the system may have a small leak.
Return to step 2: If the same result is encountered check
for leaks as previously indicated and repair as necessary
then repeat evacuation.
• If pressure rises above 2000 microns, a leak is present.
Check for leaks as previously indicated and repair as
necessary then repeat evacuation.
5000
4500
4000
3500
3000
2500
2000
1500
1000
500
0 1 2 3 4 5 6 7 8 9 10
LEAK(S)
PRESENT
MINUTES
VACUUM IN MICRONS
CONDENSIBLES OR SMALL
LEAK PRESENT
NO LEAKS
NO CONDENSIBLES
E
LECTRICAL
C
ONNECTIONS
HIGH VOLTAGE!
D
ISCONNECT
ALL
POWER
BEFORE
SERVICING
.
M
ULTIPLE
POWER
SOURCES
MAY
BE
PRESENT
. F
AILURE
TO
DO
SO
MAY
CAUSE
PROPERTY
DAMAGE
,
PERSONAL
INJURY
OR
DEATH
DUE
TO
ELECTRIC
SHOCK
. W
IRING
MUST
CONFORM
WITH
NEC
OR
CEC
AND
ALL
LOCAL
CODES
. U
NDERSIZED
WIRES
COULD
CAUSE
POOR
EQUIPMENT
PERFORMANCE
,
EQUIPMENT
DAMAGE
OR
FIRE
.
WARNING
T
O
AVOID
THE
RISK
OF
FIRE
OR
EQUIPMENT
DAMAGE
,
USE
COPPER
CONDUCTORS
.
WARNING
GROUNDING REQUIRED!
A
LWAYS
INSPECT
AND
USE
PROPER
SERVICE
TOOLS
. L
ACK
OF
INSPECTION
OR
IMPROPER
TOOLS
MAY
CAUSE
EQUIPMENT
DAMAGE
OR
PERSONAL
INJURY
. A
LL
DISCONNECTED
GROUNDING
DEVICES
MUST
BE
RECONNECTED
BEFORE
INSTALLING
OR
SERVICING
. M
ULTIPLE
COMPONENTS
OF
THIS
UNIT
MAY
CONDUCT
ELECTRICAL
CURRENT
;
THESE
ARE
GROUNDED
. I
F
SERVICING
THE
UNIT
,
ANY
DISCONNECTION
OF
GROUNDING
WIRES
,
SCREWS
,
STRAPS
,
CLIPS
,
NUTS
OR
WASHERS
USED
TO
COMPLETE
THE
GROUND
MUST
BE
RETURNED
TO
THEIR
ORIGINAL
POSITION
AND
PROPERLY
FASTENED
.
CAUTION
The heat pump unit rating plate lists pertinent electrical data
necessary for proper electrical service and overcurrent protec-
tion. Wires should be sized to limit voltage drop to 2% (max.)
from the main breaker or fuse panel to the condensing unit.
Consult the NEC, CEC, and all local codes to determine the cor-
rect wire gauge and length.
Local codes often require a disconnect switch located near the
unit; do not install the switch on the unit. Refer to the installa-
tion instructions supplied with the indoor furnace/air handler
for specific wiring connections and indoor unit configuration.
OVERCURRENT P ROTECTION
The inverter control system software provides sufficient time
delay to protect from overcurrent conditions and permit the com-
pressor and fan motors to adjust their rotational speed.
HIGH VOLTAGE CONNECTIONS
Route power supply and ground wires through the high voltage
port and terminate in accordance with the wiring diagram pro-
vided inside the control panel cover.
LOW VOLTAGE CONNECTIONS
The unit is designed to work as part of a fully communicating
HVAC system, utilizing a ComfortNet™ CTK04 thermostat,
ComfortNet compatible indoor unit, and up to four wires. Route
control wires through the low voltage port and terminate in ac-
cordance with the wiring diagram provided inside the control
panel cover.
7
Voltage Ports
NOTE: The communicating thermostat is able to search and iden-
tify the indoor and outdoor units when power is applied to the
system. Refer to the communicating thermostat’s installation
instruction manual for more information.
Connect low voltage communication wires (1, 2) to low voltage
pigtail provided.
THERMOSTAT WIRING
NOTE: A removable plug connector is provided with the control
to make thermostat wire connections. This plug may be removed,
wire connections made to the plug, and replaced. It is STRONGLY
recommended that you do not connect multiple wires into a
single terminal without mechanically twisting the tips together
with a set of pliers. Failure to do so may result in intermittent
operation.
Typical 18 AWG thermostat wire may be used to wire the sys-
tem components. However, communications reliability may be
improved by using a high quality, shielded, twisted pair cable for
the data transmission lines. In either case, 250 feet is the maxi-
mum length of wire between indoor unit and outdoor unit, or
between indoor unit and thermostat.
TWO-WIRE OUTDOOR, FOUR-WIRE INDOOR WIRING
Low voltage wiring consists of two wires between the indoor
unit and outdoor unit and four wires between the indoor unit
and thermostat. The required wires are data lines 1 and 2, “R”
(24 VAC hot) and “C” (24 VAC common).
12RC
12RC
CTK04
Thermostat
Compatible
A
ir Handler/Furnace
Integrated Control Module
Compatible AC/HP
Integrated Control Module
12RC
System Wiring
STEP 1. CALCULATE REFRIGERANT CHARGE BASED ON LINE
SET LENGTH
The heat pump unit is shipped with a predetermined factory
charge level as shown below. For longer line sets greater than
15 feet, add 0.6 ounces of refrigerant per foot.
NOTICE
T
OTAL
R
EFRIGERANT
=
F
ACTORY
C
HARGE
+ (0.6
OZ
./
FT
. * A
DDITIONAL
F
EET
OF
A
CTUAL
L
INE
S
ET
).
The following table shows refrigerant amounts for every 5 feet of
line.
15 (Factory Charge) 165 272 272 242
20 168 275 275 245
25 171 278 278 248
30 174 281 281 251
35 177 284 284 254
40 180 287 287 257
45 183 290 290 260
50 186 293 293 263
55 189 296 296 266
60 192 299 299 269
65 195 302 302 272
70 198 305 305 275
75 201 308 308 278
80 204 311 311 281
85 207 314 314 284
90 210 317 317 287
95 213 320 320 290
100 216 323 323 293
105 219 326 326 296
110 222 329 329 299
115 225 332 332 302
120 228 335 335 305
125 231 338 338 308
130 234 341 341 311
135 237 344 344 314
140 240 347 347 317
145 243 350 350 320
150 246 353 353 323
155 249 356 356 326
160 252 359 359 329
165 255 362 362 332
170 258 365 365 335
175 261 368 368 338
180 264 371 371 341
185 267 374 374 344
190 270 377 377 347
195 273 380 380 350
200 276 383 383 353
Unit Tonnage
Actual Line Set Length
(ft.) 2-Ton 3-Ton 4-Ton 5-Ton
Refrigerant (Oz.)
8
STEP 2. CONNECT HEAT PUMP UNIT TO SYSTEM
OPEN THE LIQUID VALVE FIRST! I
F
THE
GAS
SERVICE
VALVE
IS
OPENED
FIRST
,
OIL
FROM
THE
COMPRESSOR
MAY
BE
DRAWN
INTO
THE
INDOOR
COIL
OR
TXV
RESTRICTING
REFRIGERANT
FLOW
AND
AFFECTING
OPERATION
OF
THE
SYSTEM
.
POSSIBLE REFRIGERANT LEAK!
T
O
AVOID
A
POSSIBLE
REFRIGERANT
LEAK
,
OPEN
THE
SERVICE
VALVES
UNTIL
THE
TOP
OF
THE
STEM
IS
1/8”
FROM
THE
RETAINER
.
CAUTION
E
NSURE
VALVES
ARE
OPEN
AND
ADDITIONAL
CHARGE
IS
ADDED
PER
CHART
BEFORE
APPLYING
POWER
.
CAUTION
When opening valves with retainers, open each valve only until
the top of the stem is 1/8” from the retainer. To avoid loss of
refrigerant, DO NOT apply pressure to the retainer. When open-
ing valves without a retainer, remove service valve cap and in-
sert a hex wrench into the valve stem and back out the stem by
turning the hex wrench counterclockwise. Open the valve until it
contacts the rolled lip of the valve body.
NOTE: Units may utilize ball valves or front seating valves. These
are not back-seating valves. It is not necessary to force the stem
tightly against the rolled lip.
After the refrigerant charge has bled into the system, open the
liquid service valve. The service valve cap is the secondary seal
for the valves and must be properly tightened to prevent leaks.
Make sure cap is clean and apply refrigerant oil to threads and
sealing surface on inside of cap. Tighten cap finger-tight and then
tighten additional 1/6 of a turn to properly seat the sealing sur-
faces.
Do not introduce liquid refrigerant from the cylinder into the
crankcase of the compressor as this may damage the compres-
sor.
Break vacuum by fully opening liquid and gas base valve.
ATTENTION INSTALLER - IMPORTANT NOTICE!
Please read carefully before installing this unit.
• For AVZC20, do not install the 24 Volt Transformer that is included with the CTK04 Thermostat in the Heat
Pump Unit; it is not needed.
• Do not attach any wires to the R & C Terminals on the Heat Pump Unit, as they are not needed for inverter unit
setup.
•DATA LINE TERMINALS #1 AND #2 ARE POLARITY SENSITIVE. ONLY THE DATA LINES, 1 AND 2, ARE REQUIRED BETWEEN THE INDOOR AND
OUTDOOR UNITS.
•DATA LINE TERMINAL #1 FROM OUTDOOR UNIT MUST CONNECT TO TERMINAL #1 ON INDOOR UNIT AND DATA LINE TERMINAL #2 FROM
OUTDOOR UNIT MUST CONNECT TO TERMINAL #2 ON INDOOR UNIT. VERIFY WIRES ARE NOT REVERSED.
•IT IS STRONGLY RECOMMENDED TO USE WIRE NUTS AT THE INDOOR UNIT WHEN CONNECTING MULTIPLE DATA LINES OR LOW VOLTAGE WIRES
TOGETHER. IT IS NOT RECOMMENDED TO USE THE TERMINAL BLOCK TO CONNECT TWO OR MORE WIRES.
• Calculate the Liquid Line Set length and weigh in 0.6 ounces per foot of R410A refrigerant for any length over
15 feet. Or
• Charge by Sub-cooling.
Sub-cooling should be between 7° and 9°F. Allow 10 minutes of running in Charge Mode between each
amount of refrigerant added.
Setting Purpose
1 ON CT Communication Enabled
2 ON CT Communication Enabled
1ON
Cooling Emergency Mode
for Future Use *
2ON
Cooling Emergency Mode
for Future Use *
OD DS1
OD DS2
Switch #
DIPSWITCH FACTORY DEFAULT SETTINGS
* OD DS2 switch 1 and 2 both must be turned on
during normal operation mode
9
STEP 3. SYSTEM START-UP TEST
O
N
INITIAL
POWER
START
-
UP
,
THE
OUTDOOR
UNIT
WILL
DISPLAY
CODE
E11,
SIGNALING
THAT
INITIAL
SYSTEM
TEST
MUST
BE
RUN
. F
OLLOW
THE
C
OMFORT
N
ET
™
SETUP
SCREEN
TO
ENTER
APPLICATION
-
UNIQUE
INFORMATION
. S
EE
C
OMFORT
N
ET
THERMOSTAT
MANUAL
FOR
DETAILED
INFORMATION
.
NOTICE
A system test is now required to check the equipment
settings and functionality. Once selected, it checks the
equipment for approximately 5 - 15 minutes. System test
may exceed 15 minutes if there is an error. Refer to
the Troubleshooting section.
Before starting the SYSTEM TEST, turn off the electric heater
or gas furnace.
1. Ensure the thermostat is installed.
2. Apply power to outdoor and indoor units.
3. Start-up.
After the application information is entered,
the initial system test must be run.
F
OR
INVERTER
H/P
SYSTEM
USING
C
OMFORT
N
ET
,
DO
NOT
INSTALL
A
TRANSFORMER
.
NOTICE
The HOME screen will be displayed showing
information similar to one of the adjacent screens.
Select MENU.
NOTE: Either screen may be displayed.
SYSTEM TEST must be run for all installations.
System will not operate without a completed initial
SYSTEM TEST.
NOTE: Ensure the thermostat is in OFF mode.
10
4. From the MENU screen, scroll down and select
COMFORTNET™ USER MENU.
5. Enter Installer password. (The password is the Date
Code located on the thermostat and is available by
entering the EQUIPMENT STATUS menu and
scrolling to the bottom.)
6. Select YES to continue.
7. From the ComfortNet USER MENU,
select HEAT PUMP.
NOTE: Screen may show air handler
or furnace depending on the type of system installed.
11
8. Next, scroll down and select EQUIP TEST.
9. Select SYSTEM TEST.
10. Select ON to run the SYSTEM TEST.
Press DONE to initiate test.
11. Allow the system test to run for its duration
(5-15 minutes). EQUIP TEST SCREEN will
show the system test is ON once selected.
System test will operate the outdoor unit and the
indoor unit through a series of startup tests.
Please proceed to the next step and allow for
startup tests to complete. Do not interrupt power
to outdoor unit, indoor unit, or thermostat
during system test.
12
12. Press Previous Menu button and navigate to
HOME screen and allow test to finish. The display
similar to the one at the right will be displayed
after SYSTEM TEST completes. Test is complete
only when CODE 11 notice clears from BOTH the
thermostat display AND the seven segment LED
display on the outdoor unit. Please wait for test to
complete and for both codes to clear.
STEP 4. SET THERMOSTAT TO CHARGE MODE
Please follow the following sequence to enter CHARGE MODE.
CHARGE mode allows for charging of the system. System op-
erates for a duration of approximately one hour while the
equipment runs at full capacity. After one hour, the CHARGE
MODE ends and the system resumes normal thermostat
operation.
Before starting the CHARGE MODE, turn off the electric
heater or gas furnace.
1. On the HOME screen, select MENU.
NOTE: Set COOL or HEAT MODE to OFF before starting
CHARGE MODE.
2. From the MENU screen, select
COMFORTNET™ USER MENU.
off
13
3. Enter Installer password. (The password
is the Date Code located on the thermostat
and is available by entering the
EQUIPMENT STATUS menu and
scrolling to the bottom).
4. Select YES to continue.
5. Select HEAT PUMP.
6. Select MAINTENANCE.
14
7. Select CHARGE MODE.
8. Select ON. Press DONE to initiate CHARGE mode. (System
will then run for 1 hour and either return to cooling or
heating mode depending on the mode thermostat is set
at COOL or HEAT, or stop if the thermostat is set for FAN
only mode.)
If charging is not complete after 1 hour, repeat
7. and 8.
Refer to STEP 5 and STEP 6 for refrigerant charge
level adjustment.
9. To terminate CHARGE MODE, select CHARGE
mode screen again. Press OFF. Press DONE to
terminate CHARGE MODE.
10. Once CHARGE MODE is complete and has been
terminated, navigate to HOME screen. Enter
normal operation with temperature offset or thermostat
schedule, as desired.
15
STEP 5. ADJUST REFRIGERANT LEVEL
Using service equipment, add or recover refrigerant according to
the calculation in Step 1. Allow system to stabilize for 10 minutes
after adjusting charge level.
STEP 6. MEASURE SUBCOOLING TO VERIFY PROPER CHARGE
NOTE: Charging equipment must use dedicated PVE oil gauges
and hoses.
1. Purge gauge lines.
2. Connect service gauge manifold to base valve service ports.
3. Convert the liquid pressure to temperature using a
temperature/pressure chart.
4. Temporarily install a thermometer on the liquid line at
the liquid line service valve.
a. Ensure the thermometer makes adequate contact
and is insulated for best possible readings.
5. Subtract the liquid line temperature from the converted
liquid pressure to determine subcooling.
6. Before starting the Subcooling adjustment, make sure the
outdoor ambient temperature is in a below range and the
unit is operating at 100% capacity.
SUBCOOLING = (SAT. LIQUID TEMP.) - (LIQUID LINE
TEMP.)
SUPERHEAT = (SUCT. LINE TEMP.) - (SAT. SUCT. TEMP.)
OD Ambient Temp
(degF) < 65 °F 65°F to 105°F > 105 °F
Subcooling
(degF) Weigh in
Charge 7°F to 9°F Weigh in
Charge
Note: Subcooling information is valid only while the unit is operating
at 100% capacity or 100% of compressor speed in CHARGE MODE.
Compressor speed is displayed under STATUS menu in the thermostat.
Charging Table
7. The system subcooling should be 7 to 9°F. If not in that
range, adjust subcooling and superheat according to the
following procedure.
a. If subcooling and superheat are low, adjust TXV to 7 to
9°F superheat, then check subcooling.
NOTE: To adjust superheat, turn the valve stem clockwise
to increase and counter clockwise to decrease.
b. If subcooling is low and superheat is 7 to 9°F, add charge
to rise subcooling to 7 to 9°F, then check superheat.
c. If subcooling is low and superheat is high, add charge to
rise subcooling to 7 to 9°F, then check superheat.
d. If subcooling is 7 to 9°F and superheat is high, adjust
the TXV valve to 7 to 9°F superheat, then check
subcooling.
e. If subcooling and superheat are high, adjust the TXV
valve to 7 to 9°F superheat, then check subcooling.
f. If subcooling is high and superheat is 7 to 9°F, remove
charge to lower the subcooling to 7 to 9°F, then check
superheat.
g. If subcooling is high and superheat is low, adjust the
TXV valve to 7 to 9°F superheat and remove charge to
low the subcooling to 7 to 9°F.
h. If subcooling is 7 to 9°F and superheat is low, adjust the
TXV valve to 7 to 9°F superheat and remove charge to
lower the subcooling 7 to 9°F, then check the superheat.
NOTE: Not more than 0.5 lb. (8 Oz.) of refrigerant must
be added to the system in order to achieve the target
subcooling. It is recommended to add 4 oz. refrigerant
each time and try adjusting the TXV and let the system
stabilize.
C
HECK
THE
S
CHRADER
PORTS
FOR
LEAKS
AND
TIGHTEN
VALVE
CORES
,
IF
NECESSARY
. I
NSTALL
CAPS
FINGER
-
TIGHT
.
NOTICE
D
O
NOT
ADJUST
THE
CHARGE
BASED
ON
SUCTION
PRESSURE
UNLESS
THERE
IS
A
GROSS
UNDERCHARGE
.
NOTICE
Rain
Shield
I
F
THE
RAIN
SHIELD
WAS
REMOVED
DURING
THE
INSTALLATION
PROCESS
,
BE
SURE
TO
RE
-
INSTALL
IT
AFTER
CHARGING
THE
UNIT
.
NOTICE
HEAT PUMP WITH OUTDOOR TEMPERATURE LOCKOUTS
It is recommended to set the outdoor temperature lockouts
during the initial thermostat set up. This will enable the com-
pressor to be turned off and switch heating source from refrig-
eration to auxiliary/secondary heating under low ambient con-
ditions.
16
Backup heat lockout temperature will enable auxiliary/sec-
ondary heating to be turned on when outdoor temperature is
much higher than indoor temperature, compressor might stop
operating under this circumstance.
Line Set Length Range
(feet) Compressor Lockout Temperature
(°F)
0 to 100 15
100 to 200 20
In order to access temperature, the compressor lockout and
the backup heat lockout, press MENU and scroll down to
press INSTALLER OPTIONS. Enter the date code (password)
when prompted. Choose VIEW / EDIT CURRENT SETUP and
COMPRESSOR LOCKOUT / BALANCE POINT will be under
HEAT / COOL CONTROL OPTIONS. For more information
please refer to COMFORTNET™ CTK04 Communicating Ther-
mostat SYSTEM INSTALLATION GUIDE.
BOOST MODE
BOOST MODE enables the system to operate at a higher com-
pressor speed than rated maximum compressor speed and
satisfy the structural load more effectively during higher
ambient outdoor conditions. BOOST MODE is initiated by
an outdoor temperature sensor located in the outdoor unit.
Please note that outdoor equipment operational sound lev-
els may increase while the equipment is running in BOOST
MODE. Disabling BOOST MODE will provide the quietest and
most efficient operation.
NOTE: BOOST MODE is applicable only for AVZC200**1AB
or later revision. BOOST MODE performance is most effec-
tive when paired with an electronic expansion valve enabled
indoor unit.
BOOST MODE is ON by default and is activated when the
outdoor temperature reaches 105°F. BOOST MODE can be
disabled and enabled and the activation temperature ad-
justed in the BOOST TEMP menu using the following proce-
dure:
1. On the CTK04 HOME screen, select MENU.
2. From the MENU screen, select COMFORTNET™ USER
MENU.
SUCTION PRESSURE LIQUID PRESSURE
PSIG PSIG
50 1 200 70
52 3 210 73
54 4 220 76
56 6 225 78
58 7 235 80
60 8 245 83
62 10 255 85
64 11 265 88
66 13 275 90
68 14 285 92
70 15 295 95
72 16 305 97
74 17 325 101
76 19 355 108
78 20 375 112
80 21 405 118
85 24 415 119
90 26 425 121
95 29 435 123
100 31 445 125
110 36 475 130
120 41 500 134
130 45 525 138
140 49 550 142
150 53 575 145
160 56 600 149
170 60 625 152
SATURATED SUCTION PRESSURE
TEMPERATURE CHART SATURATED LIQUID PRESSURE
TEMPERATURE CHART
R-410A
°F R-410A
°F
17
3. Enter Installer password. (The password is the Date
Code located on the thermostat and is available by
entering the EQUIPMENT STATUS menu and scrolling
to the bottom).
4. Select YES to continue.
5. Select HEAT PUMP.
6. Select SYS SETUP.
COOL SET-UP
18
7. BOOST MD turns BOOST MODE OFF or ON. BOOST
MODE is ON by default.
8. BOOST TEMP adjusts the activation temperature
from 70°F to 105°F. “Always ON” option is also
available to permanently engage BOOST MODE.
Factory default is 105°F.
...Heat Pump > SYS SETUP > BOOST MD
...Heat Pump > SYS SETUP > BOOST TEMP
105F
19
9. Once satisfied with BOOST MODE adjustments, navigate
to the HOME screen by selecting the Previous Menu
button three times then selecting HOME.
DEHUMIDIFICATION
The thermostat reads the indoor humidity level from the CTK04
and allows the user to set a dehumidification target based on
these settings. The thermostat controls the humidity level of
the conditioned space using the cooling system. Dehumidifi-
cation is engaged whenever a cooling demand is present and
structural humidity levels are above the target level. When this
condition exists, the circulating fan output is reduced, increas-
ing system run time, over cooling the evaporator coil and ulti-
mately removing more humidity from the structure than if only
in cooling mode. The CTK04 also allows for an additional
overcooling limit setting from 0°F to 3°F setup through the
Installer Option menu (directions following). This allows the
cooling system to further reduce humidity by lowering the tem-
perature up to 3°F below the cooling setpoint in an attempt to
better achieve desired humidity levels.
By default, dehumidification needs to be turned ON at the ther-
mostat via the Dehumidification Equipment menu. Dehumidi-
fication can be activated at the original equipment setup by
selecting the A/C with Low Speed Fan button in the Dehumidi-
fication Menu. Availability can be verified by pressing MENU
on the home screen. Scroll down and if a Dehumidification
button is present, dehumidification is activated.
If Dehumidification is not available in the menu then it must
be enabled through the Installer Options menu. Use the fol-
lowing procedure to enable and disable dehumidification:
1. On the CTK04 HOME screen select MENU.
2. From the MENU screen, scroll down and select Installer
Options.
3. Enter installer password if known.
a. The password is the thermostat date code and can
be obtained by selecting the red Cancel button and
selecting the Dealer Information button.
b. Once recorded, click the green OK button and re-
turn to the previous step.
4. Select YES to continue.
5. Select View / Edit Current Setup.
6. Scroll down and select Dehumidification.
7. Once open select Dehumidification Equipment: None.
8. From the Dehumidification Menu select A/C with Low Speed
Fan and click the green Done button.
9. Additional Dehumidification operational options can be
selected in the resulting window.
10. Once satisfied with the selection, navigate to the HOME
screen by selecting the Done button and selecting Yes to
verify the changes.
11. Select Previous Menu, then the HOME to return to the
main menu.
DEHUMIDIFICATION TIPS
For effective dehumidification operation:
• Ensure “Dehum” is ON through the Installer Options
menu and/or in the ComfortNet User Menu (COOL
SETUP).
-If ON, the Dehumidification menu should be visible in
the main menu.
• Verify the cooling airflow profile is set to “Profile D”.
-See the Cool Set-up section of the Installation Manual
for complete airflow profile details.
-By default, “Dehum” is ON and the cooling airflow pro-
file is set to “Profile D”.
• For additional dehumidification control, airflow settings
are field adjustable and can be fine-tuned to a value that
is comfortable for the application from a range of +15%
to -15%.
-See the Heat Pump Advanced Feature Menu section
of the Installation Manual for more detail.
20
COMFORTNET™ SYSTEM
OVERVIEW
A ComfortNet inverter heating and air conditioning system uses
an indoor unit, outdoor unit and thermostat which digitally com-
municate with one another via a two-way communications path.
The thermostat sends commands to the indoor and outdoor
units. The thermostat may request and receive information from
both the indoor and outdoor units. This information may be dis-
played on the CTK04 thermostat. The indoor and outdoor units
also interact with one another. The outdoor unit may send com-
mands to or request information from the indoor unit. This two-
way digital communications between the thermostat and sub-
systems (indoor/outdoor unit) and between subsystems is the
key to unlocking the benefits and features of the ComfortNet
system.
Two-way digital communications is accomplished using only two
wires. The thermostat needs 24 VAC for power. 4 wires between
the indoor unit and thermostat plus two wires between the in-
door unit and outdoor unit are all that are required to operate
the system.
COMFORTNET SYSTEM ADVANCED FEATURES
The ComfortNet™ system permits access to additional system
information, advanced set-up features, and advanced diagnos-
tic/troubleshooting features. These advanced features are orga-
nized into a menu structure. See the HEAT PUMP ADVANCED
FEATURES MENU section for the menu layout.
DIRECTIONS TO HEAT PUMP ADVANCED FEATURE MENUS
Press MENU, scroll down and press COMFORTNET USER MENU.
Enter the date code (password) when prompted. The date code is
printed on the back of the thermostat; or press MENU > EQUIP-
MENT STATUS and scroll down to find the date code. After you
enter the password, select COMFORTNET USER MENU, answer YES
to the following menu and select HEAT PUMP to view the system
menus.
DIAGNOSTICS
The heat pump’s diagnostics menu provides access to the most
recent faults. The six most recent faults are displayed on the first
screen. Six additional faults are displayed under fault history.
Faults are stored in order from most recent to least recent. Any
consecutively repeated fault is stored a maximum of three times.
Example: A leak in the system, low refrigerant charge or an incom-
pletely open stop valve can cause the unit to flash error code E15.
This error code suggests that the unit is experiencing operation at
low pressure. The control will only store this fault the first three
consecutive times the fault occurs.
NOTE: It is highly recommended that the fault list be cleared after
performing maintenance or servicing the system.
STATUS
This menu displays information about the systems current status.
This menu can be utilized to confirm correct functionality of the
equipment and for troubleshooting purposes. The following items
will be displayed:
TS Time Stamp
MD Mode
CRM Compressor Reduction Mode
RAD Requested and Actual % Demand
RAF Requested and Reported ID CFM
ATOF* Outdoor Air Temperature and Outdoor Fan RPM
DCT Discharge Temperature and Outdoor Coil Temperature
DLT Defrost Sensor and Outdoor Liquid Temperature
PSDST** Pressure Sensor and Outdoor Suction Temperature
*Only for AVZC200**1AB or later revision.
ATPRM is shown in AVZC200**1AA revision.
** Only for AVZC200**1AB or later revision.
PSD is shown in AVZC200**1AA revision.
Time Stamp: Provides compressor run time in hours.
Mode: Current system operational mode (COOLING, HEATING,
COOLING STARTUP, HEATING STARTUP, OIL RETURN, DEFROST,
STOP).
Compressor Reduction Mode: The compressor is running at a
speed lower than what is requested, based on the cooling load.
Requested and Actual % Demand: Compares the requested cool-
ing demand to what the equipment is providing. For steady state
operation, these numbers should match.
Requested and Reported ID CFM: Compares the requested in-
door airflow to what the indoor equipment has reported.
Outdoor Air Temperature and Outdoor Fan RPM: Displays the
outdoor air temperature as well as the outdoor fan speed (RPM).
Discharge Temperature and Outdoor Coil Temperature: Displays
the discharge temperature and outdoor coil temperature sensor
readings.
Defrost Sensor and Outdoor Liquid Temperature: Displays de-
frost sensor and outdoor liquid temperature sensor readings.
Pressure Sensor: Displays the pressure sensor reading.
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