Daikin DM80SN U Series Installation Instructions Manual
Ultra low nox gas furnace
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Installation Instructions for
DM80SN*U Ultra Low NOx Gas Furnace
CATEGORY I CATÉGORIE I
These furnaces comply with requirements embodied in the
American National Standard/National Standard of Canada
ANSI Z21.47·CSA-2.3 Gas Fired Central Furnaces.
ATTENTION INSTALLING PERSONNEL
As a professional installer, you have an obligation to know
the product better than the customer. This includes all safety
precautions and related items.
Prior to actual installation, thoroughly familiarize yourself with
this Instruction Manual. Pay special attention to all safety
warnings. Often during installation or repair, it is possible to
place yourself in a position which is more hazardous than
when the unit is in operation.
Remember, it is your responsibility to install the product safely
and to know it well enough to be able to instruct a customer
in its safe use.
Safety is a matter of common sense...a matter of thinking
before acting. Most dealers have a list of specific, good safety
practices...follow them.
The precautions listed in this Installation Manual are intended
as supplemental to existing practices. However, if there is a
direct conflict between existing practices and the content of
this manual, the precautions listed here take precedence.
R
ECOGNIZE THIS SYMBOL
AS A SAFETY PRECAUTION
NOTE: Please contact your distributor or our website listed below
for the applicable Specification Sheet referred to in this manual.
80% HEX
Our continuing commitment to quality products may mean a change in specifications without notice.
IOD-2031
09/2021
Installer: Affix all manuals
adjacent to the unit.
DO NOT LIFT
PRODUCT USING
HEAT EXCHANGER
©2021
19001 Kermier Rd., Waller, TX 77484
www.daikincomfort.com
INSTALLATION INSTRUCTIONS
TABLE OF CONTENTS
SAFETY CONSIDERATIONS ....................................................... 3
Shipping Inspection ........................................................... 5
Electrostatic Discharge (ESD) Precautions ......................... 5
To The Installer .................................................................. 6
PRODUCT APPLICATION ........................................................... 6
LOCATION REQUIREMENTS AND CONSIDERATIONS ................ 7
Clearances and Accessibility.............................................. 8
Installation Positions ......................................................... 8
Horizontal Installation ....................................................... 8
Furnace Suspension .......................................................... 9
Existing Furnace Removal .................................................. 9
Thermostat Location ......................................................... 9
COMBUSTION AND VENTILATION AIR REQUIREMENTS ........ 10
CATEGORY I VENTING (VERTICAL VENTING) .......................... 10
MASONRY CHIMNEYS ............................................................ 11
Masonry Chimney Termination ....................................... 11
ELECTRICAL CONNECTIONS ................................................... 11
Wiring Harness ................................................................ 11
120 Volt Line Connections ............................................... 11
Junction Box Relocation .................................................. 11
24 Volt Thermostat Wiring .............................................. 12
120 Volt Line Connection of Accessories ........................ 12
Humidifier and Electronic Air Cleaner ............................. 12
Fossil Fuel Applications ................................................... 13
GAS SUPPLY AND PIPING ....................................................... 13
High Altitude Derate ....................................................... 13
Gas Piping Connections ................................................... 13
Upflow Installations ........................................................ 14
Gas Piping Checks ........................................................... 14
CIRCULATING AIR AND FILTERS ............................................. 15
Only personnel that have been trained to install, adjust, service
or repair (hereinafter, "service") the equipment specified in
this manual should service the equipment. The manufacturer
will not be responsible for any injury or property damage
arising from improper service or service procedures. If you
service this unit, you assume responsibility for any injury or
property damage which may result. In addition, in jurisdictions
that require one or more licenses to service the equipment
specified in this manual, only licensed personnel should service
the equipment. Improper 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.
WARNING
DO NOT BYPASS SAFETY DEVICES
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Summary of Contents for Daikin DM80SN U Series
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Page 1: Table Of Contents
INSTALLATION INSTRUCTIONS Installation Instructions for TABLE OF CONTENTS DM80SN*U Ultra Low NOx Gas Furnace SAFETY CONSIDERATIONS ............3 Shipping Inspection ............5 CATEGORY I CATÉGORIE I Electrostatic Discharge (ESD) Precautions ......5 To The Installer ..............6 These furnaces comply with requirements embodied in the PRODUCT APPLICATION ............ -
Page 2: Safety Considerations
Ductwork - Air Flow ............15 General ................24 Filters - Read This Section Before Integrated Control Module ..........24 Installing The Return Air Ductwork ......... 15 Primary Limit ..............24 Upright Installations ............15 Auxiliary Limit..............24 Circulation Air Filters ............16 Burner Temperature Switch .......... - Page 3 Always install a furnace to operate within the furnace’s in- tended temperature-rise range with a duct system which has WARNING external static pressure within the allowable range, as speci- F THE INFORMATION IN THESE INSTRUCTIONS IS NOT FOLLOWED fied on the furnace rating plate and OPERATIONAL CHECKS EXACTLY A FIRE OR EXPLOSION MAY RESULT CAUSING PROPERTY section of these instructions.
- Page 4 CARBON MONOXIDE POISONING HAZARD RISQUE D’INTOXICATION AU MONOXYDE DE CARBONE Failure To Follow The Steps Outlined Below For Each Appliance Si les étapes décrites ci-dessous ne sont pas suivies pour chacun Connected To The Venting System Being Placed Into Operation des appareils raccordés au système de ventilation au moment Could Result In Carbon Monoxide Poisoning Or Death.
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Page 5: Additional Safety Considerations
RISQUE D'EMPOISONNEMENT AU MONOXYDE DE CARBONE Advertencia especial para la instalación de calentadores ó manejadoras de aire en áreas cerradas como estacionamientos ó cuartos de servicio. Cette ventilation est nécessaire pour éviter le danger d'intoxication Las emisiones de monóxido de carbono pueden circular a través au CO pouvant survenir si un appareil produisant du monoxyde del aparato cuando se opera en cualquier modo. -
Page 6: To The Installer
To The Installer • 100% outside air must be used for combustion during construction. Temporary ducting may be used to Before installing this unit, please read this manual thoroughly supply outside air to the furnace for combustion – do to familiarize yourself with specific items which must be ad- not connect this duct directly to the furnace. -
Page 7: Location Requirements And Considerations
Location Requirements and Considerations • If the furnace is used in connection with a cooling unit, install the furnace upstream or in parallel with the cooling unit coil. Premature heat exchanger failure WARNING will result if the cooling unit coil is placed ahead of O PREVENT POSSIBLE EQUIPMENT DAMAGE PROPERTY DAMAGE the furnace. -
Page 8: Clearances And Accessibility
Clearances and Accessibility NOTE: For servicing or cleaning, a 24” front clearance is required. Unit connections (electrical, flue and drain) may necessitate greater clearances than the minimum clearanc- es listed above. In all cases, accessibility clearance must take precedence over clearances from the enclosure where accessibility clearances are greater. -
Page 9: Furnace Suspension
Line contact to framing is permitted when installed in the In so far as practical, close all building doors and horizontal configuration. Line contact is defined as the windows and all doors between the space in which the appliance(s) connected to the venting system portion of the cabinet that is formed by the intersection of the top and side. -
Page 10: Combustion And Ventilation Air Requirements
Combustion and Ventilation Category I Venting (Vertical Venting) Air Requirements WARNING WARNING O PREVENT POSSIBLE PERSONAL INJURY OR DEATH DUE TO ASPHYXIATION THIS FURNACE MUST BE ATEGORY VENTED O NOT O AVOID PROPERTY DAMAGE PERSONAL INJURY OR DEATH SUFFICIENT FRESH AIR FOR PROPER COMBUSTION AND VENTILATION OF VENT USING ATEGORY VENTING... -
Page 11: Masonry Chimneys
Masonry Chimneys Wiring Harness The wiring harness is an integral part of this furnace. Field alteration to comply with electrical codes should not be re- WARNING quired. Wires are color coded for identification purposes. OSSIBILITY OF PROPERTY DAMAGE PERSONAL INJURY OR DEATH Refer to the wiring diagram for wire routings. -
Page 12: 24 Volt Thermostat Wiring
INDOOR 24 VAC BOARD TERMINAL 24 VAC Thermostat CONNECTIONS Thermostat Condensing Unit 4. Attach the junction box to the left side of the fur nace, INDOOR INDOOR 24 VAC BOARD TERMINAL 24 VAC BOARD TERMINAL Thermostat CONNECTIONS using the screws removed in step 2. Thermostat CONNECTIONS 5. -
Page 13: Fossil Fuel Applications
NOTE: Do not remove the gas valve inlet plug before the The furnace integrated control module is equipped with de- gas line is installed. Replace if water or debris has been di-cated ¼ inch EAC and HUM relay terminals for controlling external power to an optional field-supplied humidifier and/ introduced. -
Page 14: Upflow Installations
repeated wetting by liquids such as water (except rain Natural Gas Capacity of Pipe In Cubic Feet of Gas Per Hour (CFH) water), detergents, or sewage. The gas piping may Length of Nominal Black Pipe Size enter the left or right side of the furnace cabinet. The Pipe in Feet 1/2"... -
Page 15: Circulating Air And Filters
When the furnace is used in connection with a cooling unit, CAUTION the furnace should be installed in parallel with or on the upstream side of the cooling unit to avoid condensa tion in O PREVENT PROPERTY DAMAGE OR PERSONAL INJURY DUE TO FIRE the heating element. -
Page 16: Circulation Air Filters
• The control is now ready to receive demands from the AIR FLOW room thermostat. Refer to Status Menu in this manual CENTRAL for interpretation of items displayed in the status menu RETURN GRILLE Gas Heating Mode SIDE RETURN EXTERNAL FILTER The normal operational sequence in gas heating mode is as RACK KIT (EITHER SIDE) -
Page 17: Heat Pump Mode
After the thermostat is satisfied, the compressor is relay will close the EAC contacts. • After the thermostat is satisfied, the compressor is de- de-energized and the electronic air cleaner EAC and • humidifier HUM relays de-energize. The HP Heat Mode energized and the Cool Mode Fan Off Delay period Fan Off Delay period begins. -
Page 18: Quick Start
Control Board Main Menu access door in place except for inspection and maintenance. Main Menu The integrated furnace control board is equipped with two Option Menu Description Default push-button switches used to access & navigate menus for LED Display Display furnace setup &... -
Page 19: Furnace Operation
Furnace operation 5. Close manual gas shutoff valve external to the furnace. 6. Replace the door on the unit. Purge gas lines of air prior to start-up. Do not purge lines into an enclosed burner compartment. Follow NFPA 54, National Gas Supply Pressure Measurement Fuel Gas Code 8.1 for proper purging methods. -
Page 20: Gas Manifold Pressure Measurement And Adjustment
8. Measure the gas manifold pressure with burners firing. pressure Tap on the White-Rodgers gas valve, then Adjust manifold pressure using the following Manifold use the 36G/J Valve Pressure Check Kit, Daikin Part Gas Pressure table. No. 0151K00000S. Manifold Gas Pressure Natural Gas 2.8"... -
Page 21: Temperature Rise
(3600 seconds). the heat exchanger. 3. If the 1/2 cu. ft. dial was used, multiply your number 3. Subtract the return air temperature from the supply X 2. EXAMPLE: If it took 23 seconds to complete one air temperature to determine the air temperature rise. revolution of the 1/2 ft. -
Page 22: Cooling Mode Speed Selection
AVAILABLE SPEEDS THERMOSTAT CALL AVAILABLE SPEEDS THERMOSTAT CALL (FSd menu) (OdS: Terminal) (AC2 menu) 2AC: Y1 + Y2 2HP: Y1 + Y2 + O Circulation Speed Table Two Stage Cooling Speed Table Cooling Mode Speed Selection Gas Heating Mode Speed Selection To change the main blower speed in COOLING mode, follow To change the main blower speed in GAS HEATING mode, the following steps:... -
Page 23: Circulator Blower Fan Timing Adjustment
Operational Checks THERMOSTAT CALL AVAILABLE SPEEDS (OdS: Terminal) (HP1 menu) WARNING O AVOID PERSONAL INJURY OR DEATH DO NOT REMOVE ANY INTERNAL COMPARTMENT COVERS OR ATTEMPT ANY ADJUSTMENT LECTRICAL COMPONENTS ARE CONTAINED IN BOTH COMPARTMENTS 1HP: Y1 ONTACT A QUALIFIED SERVICE AGENT AT ONCE IF AN ABNORMAL OPERATION SHOULD DEVELOP Checking Duct Static Refer to your furnace rating plate for the maximum ESP (ex-... -
Page 24: Safety Circuit Description
temperatures. The control is a normally closed (electrically), automatic reset, temperature activated sensor. It guards against overheating resulting from insufficient air passing over the heat exchanger. The auxiliary limit control is suitable for both horizontal right and horizontal left installations. Regardless of airflow direction, it does not need to be relocated. -
Page 25: Maintenance
flame and will lock out. The flame sensor should be carefully NOTE: If the condition which originally caused the lockout still cleaned by a qualified servicer using steel wool. The flame exists, the control will return to lockout. Refer to the Diagnostic sense signal should be 1 to 3 microamps. -
Page 26: Repair And Replacement Parts
Repair and Replacement Parts • When ordering any of the listed functional parts, be sure to provide the furnace model, manufacturing, and serial numbers with the order. • Although only functional parts are shown in the parts list, all sheet metal parts, doors, etc. may be ordered by description. -
Page 27: Component Id
Component ID Tubular Heat Exchanger Pressure Sensor Assembly Flue Pipe Connection Gas Line Entrance Gas Valve Inducer Gas Manifold Assembly 8 Burner Assembly Integrated Control Module Blower Door Interlock Switch Circulator Blower 10 Transformer Tubular Heat Exchanger Pressure Switch Gas Line Entrance Gas Valve Inducer Gas Manifold Assembly... -
Page 28: Troubleshooting Charts
Troubleshooting Chart Corrective Actions Symptom LED Status Fault Description Normal Operation I dL Stand-by Mode. Normal Operation None Internal Control fault Replace control board Furnace Fails to Operate Locate and correct gas interruption Replace or realign igniter Check flame sense signal, clean sensor if coated or Furnace lockout due to an excessive number of oxidized ignition “retries”... - Page 29 Troubleshooting Chart Corrective Actions Symptom LED Status Fault Description Polarity of 115 volt AC is reversed Correct polarity, check and correct wiring if necessary Furnace fails to operate Poor unit ground Verify proper ground, correct if necessary Gas valve is energized when it should not be Check wiring in gas valve circuit Furnace fails to operate Internal gas valve error...
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Page 30: Blower Performance Data
Blower Performance Data DM80SN-U COOLING AIFLOW EXTERNAL STATIC PRESSURE, (INCHES WATER COLUMN) THERMOSTAT MODEL TAP # CALL DM80SN0403AU* Y1/Y2 1058 1015 1116 1071 1036 1003 1238 1192 1158 1124 1098 1070 1044 1016 1398 1357 1320 1293 1269 1239 1216 1194 DM80SN0603AU* 1060... - Page 31 Blower Performance Data DM80SN-U-H HEATING AIFLOW EXTERNAL STATIC PRESSURE, (INCHES WATER COLUMN) THERMOSTAT MODEL TAP # TEMP RANGE CALL RISE RISE RISE RISE RISE DM80SN0403AU* W/W1 25 - 55 1058 1015 1116 1071 1036 1003 1238 1192 1158 1124 1098 1070 1044 1016...
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Page 32: Wiring Diagram
Wiring diagram PRESSURE TRANSDUCER 120 VAC/ 1 Ø /60 HZ POWER SUPPLY WITH OVERCURRENT PROTECTION DEVICE ID BLOWER PRESSURE SWITCH DISCONNECT TR (2) GAS VALVE INTEGRATED CONTROL MODULE AUTO RESET PRIMARY LIMIT CONTROL SURFACE IGNITER AUTO RESET 2 CIRCUIT MVC (5) VALVE BURNER CONNECTOR... - Page 33 Furnace Model Number Serial Number ELECTRICAL Line Voltage (Measure L1 to N and N to Ground Voltage) L - N N - G Secondary Voltage (Measure Transformer Output Voltage) R - C Blower Amps BLOWER EXTERNAL STATIC PRESSURE Return Air Static Pressure IN.
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- Page 36 CUSTOMER FEEDBACK Daikin is very interested in all product comments. Please fill out the feedback form on the following link: https://daikincomfort.com/contact-us You can also scan the QR code on the right to be directed to the feedback page. PRODUCT REGISTRATION Thank you for your recent purchase.
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