The Signature Series is NOT designed for amateur installation. Installation SHOULD be performed by an authorized technician. Please read this manual carefully before installation and keep it for future reference. Owner & Installation Manual Signature Series MGD80*SE*XA Warm Air Gas Furnace The Signature Series is NOT designed for amateur installation. Installation SHOULD be performed by an authorized technician. Please read this manual carefully before installation and keep it for future reference.
INSTALLATION INSTRUCTIONS MGD80*SE*XA Warm Air Gas Furnace This manual must be left with the homeowner for future reference. Table of Contents Unit Dimensions Parts Arrangement MGD80*E Gas Furnace Safety Information 2 3 4 4 4 6 6 8 11 Duct System 11 19 21 25 29 30 33 34 WARNING CAUTION *P507332-02C* Manufactured By MRCOOL, LLC Hickory, KY 42051 (P) 507332-02C Save these instructions for future reference 507332-02C mrcool.
Unit Dimensions Top View 9/16 (14) COMBUSTION AIR INTAKE EXHAUST AIR OUTLET RETURN AIR OPENING B 9/16 (14) 2-1/6 (52) 2-1/4 (57) A 5 (127) 9/16 (14) B 27-3/4 (705) 1 (25) Front Panel 19-17/16 (494) 33 (838) 9/16 (14) ELECTRICAL INLET (Either Side) 2 (51) Either Side CONDENSATE TRAP CONNECTION (Either Side) GAS PIPING INLET (Either Side) 9-1/8 (232) Right 6-9/16 (157) Left 3/4 (19) Supply Air 6-1/2 (165) Either Side Supply Air 3/4 (19) C Side View Front View Capacity 3/4 (19) 19-1
Parts Arrangement BLOWER ASSEMBLY CONTROL BOX FLUE CHASE INTERNAL FLUE PIPE ASSEMBLY BURNER BOX ASSEMBLY CABINET HEAT EXCHANGER COMBUSTION AIR INDUCER GAS VALVE ACCESS PANEL ROLLOUT LOCATED INSIDE BURNER BOX Figure 1. 507332-02C mrcool.
MGD80*SE*XA Gas Furnace Safety Information MGD80*SE*XA WARNING DANGER OF EXPLOSION! NOTE: In Direct Vent installations, combustion air is taken Non-Direct Vent installations, combustion air is taken from Shipping and Packing List 2 - Screws 3 - Wire nuts Clearances 1 - Wire tie NOTE: Installed Locations Page 4 of 35 mrcool.
Temperature Rise NOTE: Use of Furnace as a Construction Heater Installed in Combination with a Cooling Coil DO NOT USE THE UNIT FOR CONSTRUCTION HEAT UNLESS ALL OF THE FOLLOWING CRITERIA ARE MET: Figure 2. Heating Unit Installed Parallel to Air Handler Unit Quincy, MA 02269 NOTE: 507332-02C EQUIPMENT MAY EXPERIENCE PREMATURE COMPONENT FAILURE AS A RESULT OF FAILURE TO mrcool.
DISCLAIMS ALL LIABILITY IN CONNECTION WITH NOTWITHSTANDING THE FOREGOING, INSTALLER IS RESPONSIBLE FOR CONFIRMING THAT THE USE OF CONSTRUCTION HEAT IS CONSISTENT WITH THE POLICIES AND CODES OF ALL REGULATING General WARNING • • • • • • • • • • • NOTE: • • • • • • • • Combustion, Dilution & Ventilation Air Page 6 of 35 mrcool.
3 NOTE: Figure 3. Inside Air from Inside 2 Air from Outside 507332-02C mrcool.
NOTE: Figure 6. Outside NOTE: Setting Equipment Figure 4. Outside (Inlet Air from Crawlspace & Outlet Air to Ventilated Attic) WARNING NOTE: NOTE: Figure 5. Outside (All Air through Ventilated Attic) Page 8 of 35 mrcool.
Figure 9. Figure 7. Return Air WARNING Type of Vent Connector Type C Type B1 Back 0 0 Sides 0† 0 0‡ 0‡ *Front See Figure 10 Figure 8. Clearances 507332-02C mrcool.
Front to Rear Side to Side in. mm in. mm 19-3/4 502 16-5/8 422 20-1/8 511 Cabinet Width NOTE Table 1. Figure 11. Figure 10. NOTE: Installation on Combustible Flooring See Figure 11 Installation on Cooling Coil Cabinet See Figure 12 NOTE: CAUTION Cabinet Width Catalog Number Front to Rear in. mm 22 559 11M60 11M61 Side to Side in. mm 18-3/4 476 22-3/4 578 Table 2. Page 10 of 35 mrcool.
Filters Duct System Society of Heating, Refrigerating and Air Conditioning Figure 12. NOTE: Supply Air Plenum Return Air Plenum NOTE: Figure 13. Venting Figure 14. 507332-02C mrcool.
IMPORTANT NOTE: Figure 15. Vent Connection Venting Using a Masonry Chimney IMPORTANT WARNING IMPORTANT Page 12 of 35 mrcool.
DO NOT NOTE 1: Refer to the provided venting tables for installations. Refer to the capacity requirements shown in the provided venting tables. General Venting Requirements Figure 16. Masonry Chimney • • NOTE: Figure 17. Common Venting Using Tile Lined Interior Masonry Chimney and Combined Vent Connector 507332-02C mrcool.
Connector Diameter inches (mm) Connector Length feet (m) 3 (76) 4 (102) 5 (127) 6 (152) 7 (178) Table 3. Page 14 of 35 mrcool.
Capacity of Type B Double Wall Vents with Type B Double Wall Connectors Serving a Single Category I Appliance Height H (feet) 6 8 10 15 20 30 Lateral L (feet) 3 inch 4 inch 5 inch 6 inch Appliance Input Rating in Thousands of Btu per Hour MIN MAX MIN MAX MIN MAX MIN MAX 0 0 78 0 152 0 251 0 375 2 13 51 18 97 27 157 32 232 4 21 49 30 94 39 153 50 227 6 25 46 36 91 47 149 59 223 0 0 84 0 165 0 276 0 415 2 12 57 16 109 25 178 28 263 5 2
Capacity of Type B Double Wall Vents with Single Wall Metal Connectors Serving a Single Category I Appliance Height H (feet) 6 8 10 15 20 30 Lateral L (feet) 3 inch 4 inch 5 inch 6 inch Appliance Input Rating in Thousands of Btu per Hour MIN MAX MIN MAX MIN MAX MIN MAX 0 38 77 59 151 85 243 126 373 2 39 51 60 96 85 158 123 231 4 NR NR 74 92 102 152 146 225 6 NR NR 83 89 114 147 163 220 0 37 83 68 164 83 273 123 412 2 39 56 59 108 83 176
Vent Connector Capacity Type B Double Wall Vents with Type B Double Wall Connectors Serving Two or More Category I Appliances Vent Height H (feet) Connector Rise R (feet) 1 22 37 35 66 46 106 58 164 6 2 23 41 37 75 48 121 60 183 3 24 44 38 81 49 132 62 199 8 10 15 20 30 3 inch 4 inch 5 inch 6 inch Appliance Input Rating in Thousands of Btu per Hour MIN MAX MIN MAX MIN MAX MIN MAX 1 22 40 35 72 49 114 64 176 2 23 44 36 80 51 128 66 195 3 24 47
Vent Connector Capacity Type B Double Wall Vents with Single Wall Metal Connectors Serving Two or More Category I Appliances Vent Height H (feet) Connector Rise R (feet) 1 NR NR NR NR NR NR NR NR 6 2 NR NR NR NR NR NR 168 182 3 NR NR NR NR 121 131 175 198 8 10 15 20 30 3 inch 4 inch 5 inch 6 inch Appliance Input Rating in Thousands of Btu per Hour MIN MAX MIN MAX MIN MAX MIN MAX 1 NR NR NR NR NR NR NR NR 2 NR NR NR NR 125 126 184 193 3 NR NR
Removal of the Furnace from Common Vent Gas Piping CAUTION WARNING CARBON MONOXIDE POISONING HAZARD Gas Supply IMPORTANT NOTE: 507332-02C mrcool.
Nominal Iron Internal Diameter 10 (3.048) 20 (6.096) 30 (9.
Leak Check Electrical ELECTROSTATIC DISCHARGE (ESD) Precautions and Procedures NOTE: CAUTION CAUTION IMPORTANT Figure 20. Figure 19. Figure 21. 507332-02C mrcool.
NOTE: • • • • Thermostat NOTE: Accessory Terminals * Note: Figure 22. Condensing Unit Thermostat Designations Indoor Blower Speeds Page 22 of 35 mrcool.
E045A3 E070B3 E090B4 E110C5 Figure 23. Wiring Diagram 507332-02C mrcool.
Figure 24. Typical Field Wiring Diagram Terminal Designations 120 HUM LINE XFMR CIRC EAC COOL HEAT FAN PARK NEUTRALS FS 24 COM HUM 24 RED LED BLOWER OFF DELAY RECALL BUTTON Figure 25. Integrated Control (Automatic Hot Surface Ignition System) Page 24 of 35 mrcool.
FOR YOUR SAFETY READ BEFORE LIGHTING UNIT WARNING STOP! Gas Valve Shown in “ON” Position WARNING WARNING Figure 26. BEFORE LIGHTING NOTE: Placing the Furnace into Operation Turning Off Gas to Unit WARNING Failure To Operate Gas Valve Operation See Figure 26 STOP! 507332-02C mrcool.
Gas Pressure Adjustment Gas Flow (Approximate) Gas Meter Clocking Chart Seconds for One Revolution Natural Capacity LP 1 cu ft Dial 2 cu ft Dial 1 cu ft Dial 2 cu ft Dial -045 80 160 200 400 -070 55 110 136 272 -090 41 82 102 204 -110 33 66 82 164 Heating Sequence of Operation Table 11.
Other Unit Adjustments Primary and Secondary Limits NOTE: Flame Rollout Switches Proper Combustion Pressure Switch Capacity CO2% for Nat. CO2% for LP -045 Temperature Rise -070 -090 -110 Table 12. High Altitude Capacity Gas Line Pressure (in. w.c.) Min. Max. (in) Manifold Pressure (in w.c.) Pressure Switch (in) Manifold Pressure (in w.c.) Pressure Switch (in) No No No 11K50 11K50 11K50 No No No Manifold Pressure (in w.c.) Pressure Switch (in) Manifold Pressure (in w.c.
Thermostat Heat Anticipation IMPORTANT NOTE: Fan Control Electrical Blower Speeds NOTE: Figure 28. Heat Fan Off Time in Seconds Constant Torque Motor Page 28 of 35 Electronic Ignition mrcool.
Blower Performance MGD80SE045A3A Performance (Less Filter) External Static Pressure in. w.c.
MGD80SE110C5A Performance (Less Filter) External Static Pressure in. w.c.
Flue And Chimney Electrical Cleaning the Heat Exchanger and Burners NOTE: Figure 29. NOx Inserts Figure 30. Remove 5 Screws if Necessary (either side of cabinet) 507332-02C mrcool.
Figure 31. Burner, Combustion Air Inducer Assembly & Heat Exchanger Removal CAUTION Page 32 of 35 mrcool.
Planned Service Fresh air grilles and louvers Instruct the homeowners to pay attention to their furnace Red LED Flash Code LED Off 1 Not used 1 NOTE Table 16. 507332-02C mrcool.
Red LED Flash Code2 LED Off 1 Not used 1 2 NOTE Table 17. Repair Parts List Cabinet Parts Heating Parts • • • • • • Control Panel • • Parts Transformer • • • • • • • Blower Parts • • • • • • Motor • Motor mounting frame Ignitor • • • Page 34 of 35 mrcool.
Requirements for Commonwealth of Massachusetts INSPECTION requirements: EXEMPTIONS: The following equipment is exempt from 24 CMR 5.08(2)(a) 1 through 4: INSTALLATION DETECTORS OF CARBON MONOXIDE VENTING SYSTEM PROVIDED. VENTING SYSTEM NOT PROVIDED. APPROVED CARBON MONOXIDE DETECTORS. SIGNAGE A copy of all installation instructions for all Product equipment, all venting instructions, all parts lists GAS VENT DIRECTLY BELOW. KEEP CLEAR OF ALL OBSTRUCTIONS.
Signature Series MGD80*SE-XA Warm Air Gas Furnace ELECTRICIAN and/or HVAC TECHNICIAN: LICENSE #: INSTALLATION DATE: INSTALLATION LOCATION: SERIAL NUMBER: The design and specifications of this product and/or manual are subject to change without prior notice. Consult with the sales agency or manufacturer for details.