A/GPUM3 13.4 SEER2 "M" SERIES With R-410A
Single Package Gas-Electric Ultra-Low NOx Heating & Cooling Unit

Safety Instructions & Warnings

⚠️WARNING: Only personnel trained in installation, adjustment, service, maintenance, or repair should service this equipment. The manufacturer is not responsible for injuries or damages arising from improper service. Improper installation, adjustment, servicing, maintenance, or repair may result in product damage, property damage, personal injury, or death.

Affix this manual and the Users Information Manual adjacent to the unit.

⚠️WARNING: Do not bypass safety devices.

ATTENTION INSTALLING PERSONNEL: Thoroughly familiarize yourself with this Installation Manual prior to installation. Observe all safety warnings. Exercise caution during installation or repair. It is your responsibility to install the product safely and educate the customer on its safe use.

? Recognize this symbol as a safety precaution.

These installation instructions cover the outdoor installation of self-contained package air conditioners and heating units. Refer to Specification Sheets for accessories.

*NOTE: Contact your distributor or the website for applicable Specification Sheets.

This Forced Air Central Unit Design Complies With Requirements Embodied In The American National Standard / National Standard of Canada Shown Below: ANSI Z21.47 CSA-2.3 Central Furnaces.

⚠️CARBON MONOXIDE POISONING HAZARD: Special warning for installation in enclosed areas like garages or utility rooms. Carbon monoxide producing devices should not be operated in enclosed areas without adequate outside ventilation. Failure to follow these instructions could result in carbon monoxide poisoning or death.

⚠️HIGH VOLTAGE: Disconnect all power before servicing or installing. Multiple power sources may be present. Failure to do so may cause property damage, personal injury, or death.

⚠️FIRE OR EXPLOSION HAZARD: Never test for gas leaks with an open flame. Use a commercially available soap solution. Failure to follow safety warnings can result in serious injury, death, or property damage.

⚠️CONSTRUCTION HEATER WARNING: This unit must not be used as a "construction heater" during finishing phases of construction due to potential for premature failure from low return air temperatures and corrosive atmospheres.

⚠️WATER DAMAGE: Do not use this unit if any part has been under water. Call a qualified service technician immediately for inspection and replacement of any affected parts.

⚠️COMBUSTIBLE MATERIALS: Do not store combustible materials or use gasoline or flammable liquids/vapors near the appliance.

⚠️GENERAL WARNING: To prevent property damage, personal injury, or death from fire, explosion, smoke, soot, condensation, electric shock, or carbon monoxide, this unit must be properly installed, repaired, operated, and maintained.

⚠️FRENCH SAFETY WARNING: AVERTISSEMENT - RISQUE D'INTOXICATION AU MONOXYDE DE CARBONE. Instructions regarding ventilation and gas leak testing are also provided in French.

General Information

This unit is approved for outdoor installation ONLY. Rated performance is achieved after 20 hours of operation.

For detailed specification sheets, visit www.goodmanmfg.com or www.amana-hac.com.

Installation must comply with local building codes, ordinances, and the latest edition of the National Fuel Gas Code NFPA 54/ANSI Z223.1 and National Standard of Canada CAN/CSA B149 Installation Codes.

Heating and cooling capacities should meet or exceed the design loads, calculated using approved methods like A.S.H.R.A.E. Guide or Manual J.

Transportation Damage

Inspect the carton for external damage upon arrival. If damage is found, request an inspection by the carrier agent immediately. Carefully inspect the unit for damage to cabinetry. Retighten any loosened bolts or screws. In case of damage, notify the carrier promptly and file a claim with supporting documents. Recycle or dispose of packaging materials according to local codes.

Unit Location

ALL INSTALLATIONS:

• Mount the unit level for proper flame pattern and condensate drainage.
• The flue outlet hood must be at least 12 inches from any building opening and three feet above any forced air inlet within ten feet.
• Avoid locating the unit where outdoor air is contaminated with chlorine or fluorine compounds (e.g., swimming pool chemicals, paint strippers).
• Do not locate the outside air intake too close to exhaust outlets, gas vent terminations, or plumbing vents. Consult local codes for specific distances.
• Maintain minimum clearances for fire protection, operation, and service access.
• Combustion air inlet and flue outlet hoods must not be obstructed.
• In some climates, elevating the unit may be necessary to avoid snow or debris blockage.
• The damper must be in the open position when the main burner is operating.
• Return air temperature for heating must be between 50°F and 100°F.
• Units manufactured after May 1, 2017 are not permitted for use in Canada for heating buildings or structures under construction.

GROUND LEVEL INSTALLATIONS ONLY:

• Prepare a level concrete base, 3" larger than the unit footprint and a minimum of 3" thick.
• Locate the base where water runoff will not collect in the unit.
• Ensure the top of the unit is unobstructed. If under an overhang, maintain 48" clearance and deflect discharge air.
• For wall applications, ensure unobstructed air to sides. Provide 12" clearance on air inlet sides in confined spaces. Allow 36" for service access.
• Locate the unit a minimum of 4" away from the wall, with connections facing the wall.

ROOFTOP INSTALLATIONS ONLY:

• Ensure the unit is installed in a level position for proper condensate drainage.
• The roof must have sufficient structural strength to support the unit and potential snow/water loads. Consult a structural engineer.
• The unit may be installed on wood floors or Class A, B, or C roof covering material.
• Provide a safe, flat surface for service personnel.

ROOF CURB INSTALLATIONS ONLY:

• Ensure sufficient structural support before mounting.
• Ductwork must be installed according to industry guidelines and placed into the roof curb before unit mounting.
• Curb insulation, cant strips, flashing, and roofing material are furnished by the contractor.

Rigging Details

⚠️WARNING: Keep the unit upright during rigging and moving. Use an adequate cable sling when using a crane.

IMPORTANT NOTE: If using bottom discharge with a roof curb, attach ductwork to the curb before installing the unit.

Gas Piping

?CAUTION: Inlet gas supply pressure must match the unit rating plate for reliable operation and to prevent equipment damage.

⚠️WARNING: Use proper size natural gas piping to avoid underfiring or equipment damage.

The unit is factory set for natural gas at altitudes shown on the rating plate. Installation must comply with local codes or the National Fuel Gas Code NFPA 54/ANSI Z223.1.

Natural Gas Connection:

• Refer to the unit rating plate for gas type and input rating.
• Inlet Gas Pressure: Min. 5.0" W.C., Max. 10.0" W.C.
• Ensure supply pressure does not vary from table values to prevent ignition issues.
• Gas input to burners must not exceed the rated input to prevent premature heat exchanger failure.

Piping Practices:

• Use black iron pipe and fittings. Flex connectors or copper piping are permitted if compliant with local codes.
• Use pipe joint compound only on male threads.
• Use ground joint unions.
• Install a drip leg (minimum 3" long) before the gas valve.
• Use two pipe wrenches when connecting to the gas valve.
• Install a manual shut-off valve within six feet of the unit.
• Tighten all joints securely.
• Connect to building piping using appropriate methods.
• Bleed air from the gas supply line after leak testing. Ensure no open flames are present during this process.

Gas Piping Checks:

• ⚠️WARNING: Leak test gas connections using a soap solution, never an open flame. Do not exceed specified pressures for testing.
• Disconnect the unit from the gas supply during pressure testing of the system at pressures exceeding 1/2 PSIG.
• Isolate the unit by closing its manual shut-off valve during pressure testing of the piping system at pressures up to 1/2 PSIG.

⚠️WARNING: Ensure no open flame is present during air bleeding.

Electrical Wiring

Mount the thermostat approximately five feet above the floor in an area with good air circulation, away from drafts, heat sources, or direct sunlight.

Units have one stage heating and one or two stages cooling. Ensure the thermostat matches the unit's stages.

⚠️WARNING: Disconnect electrical power before servicing or changing wiring.

The unit is designed for 60 Hz current at specified voltages. Internal wiring is complete; connect power supply to the contactor as shown on the unit wiring diagram. Low voltage wiring connects the unit control panel to the thermostat.

Wiring Table: Provides recommended wire sizes based on branch circuit ampacity and supply wire length.

⚠️WARNING: Wiring must be polarized and grounded.

?CAUTION: Use only copper conductors for unit protection and wiring.

Use a fuse or HACR circuit breaker rated appropriately for the unit's ampacity. Do not use gas piping or conduit as an electrical ground.

A dedicated ground wire must run from the unit to the electrical panel.

Unit Voltage: Rated 208/230V. Transformer is factory set for 240V. Reconnect primary lead for 208V operation. Some models have low-speed leads for the induced draft blower that may need adjustment.

Circulating Air and Filters

Units can be converted from horizontal to down-discharge airflow. Measure external static pressure and consult blower performance charts before installation. Blower speed may need adjustment.

Horizontal Air Flow: Single phase models may require duct covers (kits available).

Down Discharge Applications: Cut insulation and remove bottom panels for ductwork attachment.

Filters:

• ?CAUTION: Never operate the unit without an air filter installed to prevent damage and loss of efficiency.
• A return air filter is not supplied but is required. Consult the installer for filter location.
• Dirty filters are the most common cause of poor performance. Inspect filters every two months or more often if needed.
• Replace throwaway filters; clean reusable filters (wash with warm water, dry, spray with adhesive).
• Consider high-efficiency filters for better particle capture.
• Ensure airflow arrows on the filter point in the proper direction.

Venting

NOTE: Venting is self-contained. Do not modify or block.

Installation - Flue Hood Exhaust: Attach the flue hood assembly over the flue exhaust opening with screws, ensuring the opening faces down.

Installation - Combustion Air Intake Hood: Attach the second hood over the heat exchanger access door with screws, ensuring the opening faces down.

Condensate Drain

A 3/4" NPT drain connection is supplied. An external trap must be installed for proper condensate drainage.

A positive liquid seal is required.

Normal Sequences of Operation

Heating:

• Unit uses electronic ignition. Do not attempt manual lighting.
• Thermostat calls for heat (R and W contacts close).
• Integrated control performs safety checks.
• Inducer draft blower runs for 30 seconds (pre-purge).
• Igniter and gas valve energize for 4 seconds.
• Igniter produces a spark to ignite gas.
• Control monitors flame presence; gas valve stays open only if flame is detected.
• 5-second HEAT FAN ON delay starts after burner ignition.
• Unit delivers heat until thermostat is satisfied.
• Thermostat opens (R and W contacts open), gas valve de-energizes.
• Inducer draft blower runs for 30 seconds (post-purge).
• Ignition control times HEAT FAN OFF delay (adjustable 90-180 seconds, factory set at 150). This delay transfers residual heat to the conditioned space.

Cooling:

• Thermostat calls for low or high stage cooling.
• Compressor and outdoor fan energize at the selected stage.
• Indoor blower energizes approximately 6 seconds later.
• Unit delivers cooling until thermostat is satisfied.
• Compressor and outdoor fan de-energize when thermostat opens.
• Indoor blower runs at low cool speed for ~60 seconds for additional coil cooling, then de-energizes.
• A 180-second anti-short cycle timer prevents compressor recycling.

Fan Only:

• Thermostat calls for FAN ONLY (G terminal).
• Indoor blower energizes at fan-only speed.
• Blower de-energizes immediately when the fan call is removed.

Startup, Adjustments, and Checks

Heating Startup: Check unit operation after new installation or component replacement. Shut off power if sparking, odors, or unusual sounds occur.

Pre-Operation Checks:

• Close manual gas valve.
• Turn off electrical power.
• Set thermostat to lowest setting.
• Remove heat exchanger door.
• Do not attempt manual burner lighting.
• Move gas control valve to OFF.
• Wait 5 minutes for gas to clear.
• Smell for gas. Follow safety warnings if gas is detected.
• Turn gas control valve to ON.
• Replace heat exchanger door.
• Open manual gas valve.
• Turn on electrical power.
• Set thermostat to desired setting.

Gas Supply and Manifold Check:

• Measure inlet gas supply pressure and manifold pressure with burners operating. Ensure they are within specifications on the rating plate.
• Use appropriate adapter kits for pressure measurement.
• Adjust supply pressure if needed, consulting the local gas utility if necessary.
• Measure manifold pressure with burners firing and adjust regulator as needed.

Gas BTU Input Check: Measure gas input using a gas meter. Ensure input does not exceed the rating plate value.

Temperature Rise Check: Place thermometers in supply and return air registers. Ensure registers and dampers are open. Operate unit for 15 minutes before reading. Temperature rise must be within the range specified on the rating plate.

External Static Pressure Check: Measure static pressure in return and supply ducts. Add readings to determine total external static pressure. Consult tables for airflow quantity. Check for issues like closed dampers or dirty filters if static pressure is too high.

Blower Speed Adjustments: Adjust blower speed to achieve correct temperature rise. EEM motors use 24V low voltage leads for speed adjustment.

Limit Check: Block return air grille(s) to check limit control operation. Main burners should shut off after several minutes. Removing restriction should relight burners after a cooldown.

Unit Shutdown: Set thermostat low, turn off power, close gas valve, remove heat exchanger door, then replace door. Turn power back on if cooling/circulation is desired.

Cooling Startup: Outdoor temperature must be 60°F or higher. Check manual reset limit controls if cooling doesn't operate.

Troubleshooting

Refer to the Diagnostic Indicator Chart for LED flash interpretations.

Fault Recall: The ignition control stores the last five faults. Press the push-button switch to display fault codes.

Resetting From Lockout: Lockout occurs after repeated failed ignition attempts. The control can be reset automatically after one hour or by power cycling.

Pressure Sensor: Monitors inducer draft blower speed for proper air-fuel ratio. Errors can cause a five-minute lockout.

Primary Limit: Opens due to excessive supply air temperatures (e.g., dirty filter, high static). Resets automatically when temperature drops. If it opens three times in one call for heat, the unit locks out for one hour.

Flame Detected with Gas Valve Closed: Indicates a potential miswiring issue. Control attempts to reset after one hour.

Low Flame Signal: May be caused by a dirty flame sensor. If the signal drops too low, the control may display an error code.

Burner Temperature Switch: Monitors burner box temperature. Guards against improper flame draw into the heat exchanger.

ID Plug: Stores operational parameters. A valid ID plug is required for heating mode. If not present, heating requests are ignored.

Abnormal Operation - Cooling:

• Short Cycle Compressor Delay: A 3-minute delay prevents compressor cycling after power interruptions or thermostat changes. Some thermostats have longer delays.
• High Pressure Switch/Low Pressure Switch: Protect the refrigeration system. Operation is disabled if these switches open.

Maintenance

⚠️HIGH VOLTAGE: Disconnect power before servicing.

Have the gas heating section checked annually before the heating season.

Filter Replacement or Cleaning:

• A return air filter is required. Consult installer for location.
• Dirty filters cause poor performance. Inspect every two months.
• Replace throwaway filters; clean reusable filters.

Cabinet Finish Maintenance: Use automotive wax for luster, especially in direct sunlight.

Clean Outside Coil: Inspect annually and clean as needed to remove lint and debris.

Condenser, Evaporator, and Induced Draft Motors: Bearings are permanently lubricated.

Flame Sensor: Clean with steel wool if a drop in flame current occurs.

Flue Passages: Inspect and clean annually. Follow specific cleaning procedures involving burner removal and tube cleaning.

Burners: Check for proper ignition and flame appearance (predominantly blue, directed into tubes). Do not remove internal covers or attempt adjustments without a qualified servicer.

Accessories and Functional Parts

Additional accessories are available to fit specific application needs. Parts and instructions are available from your distributor.

Functional Parts List: Includes items like Gas Orifice, Gas Valve, Heat Exchanger, Igniter, Ignition Control, etc.

When ordering parts, provide the unit model and serial numbers.

Appendices

Diagnostic Chart: Provides LED status codes for troubleshooting.

Unit Dimensions: Tables and diagrams showing unit dimensions and duct openings for various models.

Wiring Diagram: Detailed wiring diagrams for unit components and thermostat connections.

Blower Performance Data: Tables detailing CFM, Watts, and Rise for various External Static Pressures (E.S.P.) across different fan speeds and operating modes. Due to the extensive nature of these tables, specific values should be consulted directly from the manual.

Homeowner's Routine Maintenance Recommendations

Bi-annual maintenance checkup by a qualified service agency is recommended before heating and cooling seasons.**

Routine Checks:

• Check thermostat settings.
• Check disconnect switch.
• Check electrical panel for tripped breakers/fuses.
• Check indoor air inlets/outlets for blockages.
• Check for unit obstructions.
• Check and clean/replace filters.

Component Checks:

• Condenser, Evaporator, Induced Draft Motors: Permanently lubricated.
• Compressor: Hermetically sealed, no additional oiling.

Annual Inspection (Qualified Servicer): Check unit support, deterioration, flue hood/inlet, return air connection, heat exchanger, burners, wiring, filters, and louvers.

Clean Outside Coil: Inspect annually; clean as needed. Avoid puncturing tubing.

Start-up Checklist

A checklist is provided for electrical, blower static pressure, temperatures, and gas pressures during startup. It also includes sections for pressures/temperatures, superheat/subcooling, and additional checks like wire routing, draining, tubing, flue elbows, blower wheel tightness, factory wiring, and outdoor motor/blade tightness.

Customer Feedback

Feedback is welcomed. Links to Goodman® and Amana® brand product feedback pages are provided, along with QR codes.

Contact information for Daikin Comfort Technologies Manufacturing, L.P. is provided.