Amana APH16 M Series User manual

RECOGNIZE THIS SYMBOL AS A SAFETY PRECAUTION.
ATTENTION INSTALLING PERSONNEL
Prior to installation, thoroughly familiarize yourself with this Installation Manual. Observe all safety warnings. During
installation or repair, caution is to be observed.
It is your responsibility to install the product safely and to educate the customer on its safe use.
Goodman Manufacturing Company, L.P.
5151 San Felipe, Suite 500, Houston, TX 77056
www.goodmanmfg.com www.amana-hac.com
©2015 Goodman Manufacturing Company, L.P.
I NSTALLATION I NSTRUCTIONS
F OR S ELF -C ONTAINED P ACKAGE
H EAT P UMP U NITS
APH16 “M” SERIES
*NOTE: Please contact your distributor or our
website for the applicable
Specification Sheets referred to in this manual.
These installation instructions cover the outdoor
installation of self contained package air conditioners
and heating units. See the Specification Sheets
applicable to your model for information regarding
accessories.
Affix this manual and Users Information Manual adjacent to the unit.
is a registered trademark of Maytag Corporation or its related companies and is used under license. All rights reserved.
IOA-3013
02/2015

2
INDEX
SHIPPING INSPECTION ...................................................................................................................................................... 4
REPLACEMENTPARTS ....................................................................................................................................................... 4
ORDERING PARTS .............................................................................................................................................................. 4
SAFETYINSTRUCTIONS..................................................................................................................................................... 4
CODESANDREGULATIONS ............................................................................................................................................... 5
EPAREGULATIONS ............................................................................................................................................................ 5
NATIONAL CODES ............................................................................................................................................................... 5
MAJORCOMPONENTS ....................................................................................................................................................... 5
PRE-INSTALLATIONCHECKS ............................................................................................................................................. 5
CLEARANCES AND ACCESSIBILITY .......................................................................................................................................... 5
UNIT LOCATION .................................................................................................................................................................. 5
GROUND LEVEL PRE-INSTALLATION DETAILS............................................................................................................................ 6
ROOF TOP PRE-INSTALLATION DETAILS ................................................................................................................................... 6
ROOF CURB INSTALLATIONS ONLY ......................................................................................................................................... 6
RIGGING DETAILS ............................................................................................................................................................... 7
CIRCULATINGAIRAND FILTERS ....................................................................................................................................... 7
AIR FLOW CONVERSION ...................................................................................................................................................... 7
DUCT WORK ..................................................................................................................................................................... 7
FILTERS ........................................................................................................................................................................... 7
PIPING ................................................................................................................................................................................. 8
CONDENSATE DRAIN ........................................................................................................................................................... 8
WIRING ................................................................................................................................................................................ 8
HIGH VOLTAGE WIRING....................................................................................................................................................... 8
LOW VOLTAGE WIRING ....................................................................................................................................................... 9
INTERNAL WIRING.............................................................................................................................................................. 9
STARTUP,ADJUSTMENTS,ANDCHECKS ......................................................................................................................... 9
COOLING START-UPPROCEDURES ........................................................................................................................................ 9
HEAT PUMP START-UPPROCEDURE ...................................................................................................................................... 9
FINAL SYSTEM CHECKS..................................................................................................................................................... 10
COMPONENTS .................................................................................................................................................................. 10
HEAT PUMPOPERATION ...................................................................................................................................................11
COOLING CYCLE .............................................................................................................................................................. 11
HEATING CYCLE ............................................................................................................................................................... 11
DEFROST CONTROL.......................................................................................................................................................... 11
AIR FLOW MEASUREMENT AND ADJUSTMENT ......................................................................................................................... 12
AIR FLOW ADJUSTMENTS FOR INDOOR BLOWER MOTOR........................................................................................................ 12
APH DIP SWITCH FUNCTIONS........................................................................................................................................... 12
APH CFM DELIVERY AND ADJUSTMENTS ............................................................................................................................ 12
APHTHERMOSTAT “FAN ONLY” MODE ............................................................................................................................... 12
APH HUMIDITY CONTROL ................................................................................................................................................. 13
APHTWO-STAGE HEATING ................................................................................................................................................ 13
APH THERMOSTAT WIRING ............................................................................................................................................... 13
EXPANSION VALVE (TXV)SYSTEM ....................................................................................................................................... 13
SYSTEM CHARGING HEATING MODE ..................................................................................................................................... 14
ELECTRICALADJUSTMENTS ........................................................................................................................................... 14

3
MAINTENANCE .................................................................................................................................................................. 14
SERVICE ............................................................................................................................................................................ 15
COMMON CAUSES OF UNSATISFACTORY OPERATION OF HEAT PUMP ON THE HEATING CYCLE ............................................................ 15
INADEQUATE AIR VOLUME THROUGH INDOOR COIL ............................................................................................... 15
OUTSIDE AIR INTO RETURN DUCT ..................................................................................................................... 15
UNDERCHARGE .............................................................................................................................................. 15
POOR “TERMINATING” SENSOR CONTACT ........................................................................................................... 15
MALFUNCTIONING REVERSING VALVE - THIS MAY BE DUE TO: ................................................................................ 15
APPENDIX ......................................................................................................................................................................... 16
TROUBLESHOOTING CHART ................................................................................................................................................ 17
APH16BLOWER PERFORMANCE DATA ................................................................................................................................18
APH16 CFM OUTPUT AND DIP SWITCH SETTINGS .............................................................................................................. 19
CFM OUTPUT FOR DIPSWITCH COMBINATIONS 1-2 (ELECTRIC HEAT) .................................................................. 19
DIPSWITCH SETTINGS FOR SINGLE AND TWO-STAGE THERMOSTATS ...................................................................... 19
CFM OUTPUT FOR DIPSWITCH COMBINATIONS 5-6 (COOLING/HEATING). ............................................................. 19
ADJUSTMENTS THROUGH DIP SWITCH COMBINATIONS 7-8.................................................................................... 19
MINIMUMCLEARANCES ................................................................................................................................................... 20
DIMENSIONS.................................................................................................................................................................... 20
START-UPCHECKLIST...................................................................................................................................................... 21

4
TOTHE INSTALLER
Carefully read all instructions for the installation prior to installing
unit. Make sure each step or procedure is understood and any
special considerations are taken into account before starting
installation. Assemble all tools, hardware and supplies needed to
complete the installation. Some items may need to be purchased
locally. After deciding where to install unit, closely look the location
over - both the inside and outside of home. Note any potential
obstacles or problems that might be encountered as noted in this
manual. Choose a more suitable location if necessary.
IMPORTANT NOTE: If a crankcase heater is used, the unit
should be energized 24 hours prior to compressor start up to
ensure crankcase heater has sufficiently warmed the compres-
sor. Compressor damage may occur if this step is not fol-
lowed.
SHIPPING INSPECTION
Upon receiving the unit, inspect it for damage from shipment.
Claims for damage, either shipping or concealed, should be filed
immediately with the shipping company. Check the unit model
number, specifications, electrical characteristics and accessories
to determine if they are correct. In the event an incorrect unit is
shipped, it must be returned to the supplier and must NOT be
installed. The manufacturer assumes no responsibility for
installation of incorrectly shipped units.
REPLACEMENT PARTS
ORDERINGPARTS
When reporting shortages or damages, or ordering repair parts,
give the complete unit model and serial numbers as stamped
on the unit’s nameplate.
Replacement parts for this appliance are available through your
contractor or local distributor. For the location of your nearest
distributor, consult the white business pages, the yellow page
section of the local telephone book or contact:
CONSUMERAFFAIRS
GOODMANMANUFACTURINGCOMPANY,L.P.
7401 SECURITY WAY
HOUSTON,TEXAS 77040
877-254-4729
SAFETY INSTRUCTIONS
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 symbols. Failure
to heed safety information increases the risk of personal injury,
property damage, and/or product damage.

5
CODES AND REGULATIONS
TheAPH M-Series heat pumps are designed for OUTDOOR USE ONLY. *PH M-Series is available in cooling capacities of 2, 2.5, 3, 3 1/2
and 4 nominal tons of cooling. Optional field installed heat kits are available in 5,8,10,15 and 20 kW. The units can be easily installed
in manufactured or modular homes with existing high-static duct work. The units can also be easily converted to accommodate a
plenum for normal or low-static applications. The APH M-Series are self contained packaged units so the only connections needed for
installation are the supply and return ducts, the line and low voltage wiring and drain connection. Rated performance is achieved after
72 hours of operation. Rated performance is delivered at the specified airflow. See outdoor unit specification sheet for split system
models or product specification sheet for packaged and light commercial models. Specification sheets can be found at www.amana-
hac.com for Amana®brand products. Within either website, please select the residential 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 contain links to that model’s specification sheet. The units are ETL listed and AHRI certified.
The information on the rating plate is in compliance with the FTC & DOE rating for single phase units.
EPAREGULATIONS
IMPORTANT:THE UNITED STATES ENVIRONMENTAL PROTECTION AGENCY (EPA)HAS ISSUED VARIOUS REGULATIONS REGARDING THE INTRODUCTION
AND DISPOSAL OF REFRIGERANTS IN THIS UNIT. FAILURE TO FOLLOW THESE REGULATIONS MAY HARM THE ENVIRONMENT AND CAN LEAD TO THE
IMPOSITION OF SUBSTANTIAL FINES. BECAUSE REGULATIONS MAY VARY DUE TO PASSAGE OF NEW LAWS, WE SUGGEST ACERTIFIED TECHNICIAN
PERFORM ANY WORK DONE ON THIS UNIT. SHOULD YOU HAVE ANY QUESTIONS PLEASE CONTACT THE LOCAL OFFICE OF THE EPA.
NATIONAL CODES
This product is designed and manufactured to permit installation in accordance with National Codes. It is the installer’s responsibility
to install the product in accordance with National Codes and/or prevailing local codes and regulations.
MAJOR COMPONENTS
The unit includes a hermetically sealed refrigerating system (consisting of a compressor, condenser coil, evaporator coil with flowrator),
an indoor blower, a condenser fan and all necessary internal electrical wiring. The heat pump also includes a reversing valve, solenoid,
defrost thermostat and control and loss of charge protection. The system is factory-evacuated, charged and performance tested.
Refrigerant amount and type are indicated on rating plate.
PRE-INSTALLATION CHECKS
Before attempting any installation, the following points should be considered:
• Structural strength of supporting members
• Clearances and provision for servicing
• Power supply and wiring
• Air duct connections
• Drain facilities and connections
• Location may be on any four sides of a home, manufactured or modular, to minimize noise
CLEARANCESAND ACCESSIBILITY
The unit is designed to be located outside the building with unobstructed condenser air inlet and discharge. Additionally, the unit
must be situated to permit access for service and installation. Condenser air enters from three sides. Air discharges upward from
the top of the unit. Refrigerant gauge connections are made on the right side of the unit as you face the compressor compartment.
Electrical connections can be made either on the right, bottom or duct panel side of the unit. The best and most common
application is for the unit to be located 10” from wall (4” minimum) with the connection side facing the wall. This “close to the wall”
application minimizes exposed wiring.
Close to the wall application assures free, unobstructed air to the other two sides. In more confined application spaces, such as
corners provide a minimum 12” clearance on all air inlet sides. Allow 36” minimum for service access to the compressor
compartment and controls. The top of the unit should be completely unobstructed. If units are to be located under an overhang,
there should be a minimum of 48” clearance and provisions made to deflect the warm discharge air out from the overhang.
UNIT LOCATION
Consider the affect of outdoor fan noise on conditioned space and any adjacent occupied space. It is recommended that the unit
be placed so that condenser air discharge does not blow toward windows less than 25 feet away. Consideration should also be
given to shade and unit appearance.
Heat pumps require special location consideration in areas of heavy snow accumulation and/or areas with prolonged continuous
subfreezing temperatures. Heat pump unit bases have holes under the outdoor coil to permit drainage of defrost water accumulation.
The unit must be situated to permit free unobstructed drainage of the defrost water and ice. A minimum 2" clearance under the
outdoor coil is required in the milder climates.

6
GROUND LEVELPRE-INSTALLATION DETAILS
The unit should be set on a solid, level foundation - preferably a
concrete slab at least 4 inches thick. The slab should be above
ground level and surrounded by a graveled area for good drainage.
Any slab used as a unit’s foundation should not adjoin the building
as it is possible that sound and vibration may be transmitted to the
structure.
ROOF TOP PRE-INSTALLATION DETAILS
Ensure that the roof is weather tight and allows proper drainage of
condensation. Use steel or treated wood beams as unit support for
load distribution.
NOTE: To ensure proper condensate drainage, unit must be installed in a level
position.
• To avoid possible property damage or personal injury, the roof must have
sufficient structural strength to carry the weight of the unit(s) and snow or
water loads as required by local codes. Consult a structural engineer to
determine the weight capabilities of the roof.
• The unit may be installed directly on wood floors or on Class A, Class B,
or Class C roof covering material.
• To avoid possible personal injury, a safe, flat surface for service personnel
should be provided.
ROOF CURB INSTALLATIONS ONLY
NOTE: Sufficient structural support must be determined prior to locating and
mounting the curb and package unit.
Curb insulation, cant strips, flashing and general roofing material are furnished
by the contractor.
GroundLevelInstallation
RooftopInstallation
RoofCurbInstallation
Curbing must be installed in compliance with the National Roofing Contractors
Association Manual. Construct duct work using current industry guidelines. The duct
work must be placed into the roof curb before mounting the package unit.

7
RIGGING DETAILS
IMPORTANT: If using bottom discharge with roof curb, duct work should be attached to the curb prior to installing the unit.
Lower unit carefully onto roof mounting curb. While rigging unit, center of gravity will cause condenser end to be lower than supply
air end.
CIRCULATING AIR AND FILTERS
AIR FLOW CONVERSION
Units can easily be converted from horizontal to down discharge air flow delivery. In down discharge or high static installations, the
installer should measure the total external static and review the blower performance charts before performing the installation. In
some installations it will be necessary to change the blower speed to provide proper air flow.
HorizontalAirFlow
Single phase models are shipped without horizontal duct covers. If needed, these
kits may be ordered through Goodman’s Service Parts department.
DownDischargeApplications
Cut insulation around bottom openings and remove panels from the bottom of the
unit, saving the screws holding the panels in place.
NOTE: Singlephasemodels require installation of horizontal duct kit #20464501PDGK
(medium chassis) and #20464502PDGK (large chassis).
DUCTWORK
Duct systems and register sizes must be properly designed for the C.F.M. and external
static pressure rating of the unit. Duct work should be designed in accordance with
the recommended methods of Air Conditioning Contractors of America Manual D
(Residential) or Manual Q (Commercial). All duct work exposed to the outdoors must
include a weatherproof barrier and adequate insulation.
A duct system should be installed in accordance with Standards of the National Board
of Fire Underwriters for the Installation of Air Conditioning, Warm Air Heating and
Ventilating Systems. Pamphlets No. 90A and 90B.
The supply duct from the unit through a wall may be installed without clearance. However, minimum unit clearances as shown in
the Appendix must be maintained. The supply duct should be provided with an access panel large enough to inspect the air
chamber downstream of the heat exchanger. A cover should be tightly attached to prevent air leaks.
For duct flange dimensions on the unit refer to the Unit Dimension illustration in the Appendix.
For down discharge applications, the duct work should be attached to the roof curb prior to installing the unit. Duct work dimensions
are shown in the roof curb installation manual.
If desired, supply and return duct connections to the unit may be made with flexible connections to reduce possible unit operating
sound transmission.
FILTERS
Filters are not provided with unit and must be supplied and
externally installed in the return duct system by the installer. A
field-installed filter grille is recommended for easy and
convenient access to the filters for periodic inspection and
Rigging
Remove these panels
for downflow duct
applications
Supply
Return
DuctCoverInstallation

8
cleaning. When installing filters, ensure the air flow arrows on the filter
are pointing toward the circulator blower.
Refer to the unit filter size chart below for filter size information. NOMINAL SIZE (INCHES) NOMINAL AREA (SQ. FT.)
10x20 1.4
14x20 1.9
14x25 2.4
15x20 2.1
16x20 2.2
16x25 2.8
20x20 2.8
20x25 3.5
25x25 4.3
MINIMUM FILTER SIZE
500 1000 1500 2000 2500 3000 3500
7
6
5
4
3
2
DISPOSABLEFILTER
PERMANENTFILTER
Airflow - SCFM
NominalFilterArea
SquareFeet
NOTE: Filters must have adequate face area for the rated quantity of the
unit. See the air delivery table below for recommended filter size. Size
the filters in accordance with their manufacturer recommendations.
Throwaway filters must be sized for a maximum face velocity of 300 feet
per minute.
PIPING
CONDENSATE DRAIN
The condensate drain connection of the evaporator is a half coupling of ¾”
N.P.T. A trap must be provided to have proper condensate drainage.
Install condensate drain trap as shown. Use ¾ “ drain connection size or
larger. Do not operate without trap. Unit must be level or slightly inclined
toward drain.
WIRING
NOTE: All wiring should be made in accordance with the National Electrical
Code.
Consult your local Power Company to determine the availability of sufficient power to operate the unit. Check the voltage, frequency,
and phase at the power supply to ensure it corresponds to the unit’s RATED VOLTAGE REQUIREMENT.
In accordance with the N.E.C. or local codes, install a branch circuit fused disconnect near the unit. Determine wire sizes and
overcurrent protection from the unit nameplate ampacity and in accordance with the Minimum Filter Size or the N.E.C. The wiring
should never be sized smaller than is recommended by either of these two sources.
Fuses smaller than that recommended on the rating plate could result in unnecessary fuse failure or service calls. The use of
protective devices of larger size than indicated could result in extensive damage to the equipment. The manufacturer bears no
responsibility for damage caused to equipment as result of the use of larger than is recommended size protective devices.
All units have undergone a run test prior to packaging for shipment. This equipment has been started at minimum rated voltage
and checked for satisfactory operation. Do not attempt to operate this unit if the voltage is not within the minimum and maximum
voltages shown on nameplate.
All exterior wiring must be within approved weatherproof conduit. The unit must be permanently grounded in accordance with
local codes, or in absence of local codes, with N.E.C. ANSI/ NFPA NO. 70-1984 or latest edition by using ground lug in the control
box.
Fuses or HACR type circuit breakers may be used where codes permit.
IMPORTANT NOTE: Some single phase units are equipped with a single-pole contactor. Exercise caution when servicing as only
one leg of the power supply is broken with the contractor.
HIGH VOLTAGE WIRING
•Single Phase. Connect two leads to terminals L1 & L2 in
the electrical control section, using wire sizes specified in
wiring table.
2" Minimum
3" Minimum
A Positive Liquid Seal
Is Required
Flexible
Tubing-Hose
Or Pipe
Drain
Connection
Unit

9
LOW VOLTAGEWIRING
•Heat Pumps. Connect 24V wires from the thermostat to the
correspondingwiresinthecontrol box using No. 18AWGasfollows:
NOTE: All APH16 units have two-stage cooling and require two-stage
heat/cool with optional third stage electric heat thermostat.
BRANCH CIRCUIT AMPACITY 15 20 25 30 35 40 45 50
SUPPLY WIRE LENGTH -
FEET
200 64443322
150 86644433
100 108866644
50 141210108866
INTERNALWIRING
A diagram detailing the internal wiring of this unit is located on the
electrical box cover. If any of the original wire supplied with the
appliance must be replaced, the wire gauge and insulation must
be the same as the original wiring.
Transformer is wired for 230 volts on the 208/230 models. See
wiring diagram for 208 volt wiring.
1. For branch circuit wiring (main power supply to unit disconnect),
the minimum wire size for the length of run can be determined
using the circuit ampacity found on the unit rating plate and the
table below. From the unit disconnect to the unit, the smallest wire size allowable may be used for the ampacity, as the
disconnect must be in sight of the unit.
2. Wire size based on 60°C rated wire insulation and 30°C Ambient Temperature (86°F).
3. For more than three conductors in a raceway or cable, see the N.E.C. for derating the ampacity of each conductor.
STARTUP, ADJUSTMENTS, AND CHECKS
COOLING START-UPPROCEDURES
With power turned off at all disconnects:
1. Turn thermostat system switch to “COOL” and fan switch to
“AUTO”. Next, turn the temperature setting as high as it will
go.
2. Inspect all registers and set them to the normal open
position.
3. Turn on the electrical supply at the disconnect.
4. Turn the fan switch to the “ON” position. The blower should begin ramping up immediately.
5. Turn the fan switch to “AUTO” position. The blower should begin ramping down after an approximate 60-second delay.
6. Slowly lower the cooling temperature until the unit starts. The compressor, blower and fan should now be operating. Allow the
unit to run 10 minutes, make sure cool air is being supplied by the unit.
7. Turn the temperature setting to the highest position, stopping the unit. The indoor blower will continue to run for approximately
60-seconds.
8. Turn the thermostat system switch to “OFF” and disconnect all power when servicing the unit.
HEAT PUMP START-UPPROCEDURE
1. Check the cooling mode for the heat pump in the same manner as above. The reversing valve is energized when the thermostat
is placed in the cooling position. A clicking sound should be noticeable from the reversing valve. By lowering the temperature
setting to call for cooling, the contractor is energized. The compressor, blower and fan should then be running. After the cooling
mode is checked out, turn the thermostat system switch to “OFF”.
2. Turn the thermostat system switch to “HEAT” and fan switch to “AUTO”.
3. Slowly raise the heating temperature setting. When the heating first stage makes contact, stop raising the temperature setting..
The compressor, blower and fan should now be running with the reversing valve in the de-energized (heating) position. After
giving the unit time to settle out, make sure the unit is supplying heated air.
Terminal Thermostat
Red R (24V)
Green G(fan)
Orange O(rev. valve)
White W1 (heat, 2nd)
Brown W2 (heat, 3rd)
Purple Y1 (low cool)
Yellow Y2 (high cool)
Blue C (24VCommon)
APH1624-48
Thermostats mustbe setto energize "G"during cooling.
This is defaulton mostall thermostats.

10
4. If the outdoor ambient is above 80°F, the unit may trip on its high pressure cut out when on heating. The compressor should
stop. The heating cycle must be thoroughly checked, so postpone the test to another day when conditions are more suitable.
DONOTFAILTOTEST.
5. If the outdoor ambient is low and the unit operates properly on the heating cycle, you may check the pressure cutout operation
by blocking off the indoor return air until the unit trips.
6. If unit operates properly in the heating cycle, raise the temperature setting until the heating second stage makes contact.
Supplemental resistance heat, if installed should now come on. Ensure all heaters energize.
NOTE: All 16 SEER models have two stages of compressor heat. During resistance heat test, increase temperature setting
until third stage heat is energized.
If outdoor thermostats are installed, the outdoor ambient must be below the set point of these thermostats for the heaters to
operate. It may be necessary to jumper these thermostats to check heater operation if outdoor ambient is mild.
7. THERMOSTATS WITH EMERGENCY HEAT. For thermostats with an emergency heat switch, raise the temperature setting until
the heating second stage makes contact. The emergency heat switch is located at the bottom of the thermostat. Move the switch
to emergency heat. The heat pump will stop, the blower will continue to run, all heaters will come on and the thermostat
emergency heat light will come on.
8. If checking the unit in the wintertime, when the outdoor coil is cold enough to actuate the defrost control, observe at least one
defrost cycle to make sure the unit defrosts completely.
FINAL SYSTEM CHECKS
1. Ensure all supply and return air grilles are adjusted and the air distribution system is balanced for the best compromise
between heating and cooling.
2. Ensure there are no air leaks in the duct work.
3. Check air flow and refrigerant charge. See Sections on Air Flow Measurement and Adjustment and Checking Charge.
4. Ensure the unit is free of “rattles”, and the tubing in the unit is free from excessive vibration. The tubes or lines should not rub
against sheet metal surfaces, edges or each other.
5. Ensure the Owner is instructed on the unit operation, filter, servicing, correct thermostat operation, etc.
Set the thermostat at the appropriate setting for cooling and heating or automatic changeover for normal use.
NOTE: The “Cooling Start-up Procedure” is a recommended step as it serves as an system indicator that the unit will operate
normally.
COMPONENTS
Contactor
This control is activated (closed) by the room thermostat for both heating and cooling. The contactor has a 24V coil and supplies
power to the compressor and outdoor fan motor.
Crankcase Heater
This item is “ON” whenever power is supplied to the unit and the crankcase heater thermostat is closed. Crankcase heater
thermostat closes at 67° and opens at 85°. It warms the compressor crankcase thereby preventing liquid migration and subsequent
compressor damage. The insert type heater is self regulating. It is connected electrically to the contactor L1 and L2 terminals.
Condenser Motor
This item is activated by the contactor during heating and cooling, except during defrost and emergency heat operation. On 460V
heat pumps, the condenser motor is activated by the CMR.
Compressor
This item is activated by the contactor for heating and cooling, except during emergency heat. It is protected by an internal overload.
Contactor Relay
This control is activated by the thermostat (24V coil) and supplies power to the contactor.
Defrost Control
The Defrost Control provides time/temperature initiation and termination of the defrost cycle. When a defrost cycle is initiated, the
Defrost Control shifts the reversing valve to “COOLING” mode, stops the outdoor fan and brings on supplemental heat. Normally,
a defrost cycle will take only 2-3 minutes unless system is low on refrigerant charge or outdoor conditions are severe (i.e. windy
and cold). The defrost control also provides for a 3 minute off cycle compressor delay.
Outdoor Thermostat
These optional controls are used to prevent full electric heater operation at varying outdoor ambient (0°F to 45°F). They are normally
open above their set points and closed below to permit staging of indoor supplement heater operation. If the outdoor ambient
temperature is below 0°F (-18°C) with 50% or higher RH, an outdoor thermostat (OT) must be installed and set at (0°) on the dial.
Failure to comply with this requirement may result in damage to the product which may not be covered by the manufacturer’s
warranty.
ReversingValveCoil
This coil is activated by the thermostat, in the cooling mode and during defrost. It positions the reversing valve pilot valve for cooling
operation.