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HEAT CONTROLLER
INSTALLATION INSTRUCTIONS
FOR INDUCED DRAFT GAS FURNACES
GMUH UPFLOW/HORIZONTAL SERIES
GMDA DOWNFLOW SERIES
Upflow/Horizontal Models
Model Number
GMUH50-E3A
GMUH75-E3A
GMUH75-E4A
GMUH100-E3A
GMUH100-E4A
GMUH100-E5A
GMUH125-E5A
GMUH150-E5A
Input (Btu)
Tons
50,000
3
75,000
3
75,000
4
100,000
3
100,000
4
100,000
5
125,000
5
150,000
5
U.L. recognized fuel gas and CO (carbon monoxide) detectors are recommended in all
applications, and their installation should be in accordance with the manufacturer's
recommendations and/or local laws, rules, regulations, or customs.
Downflow Models
Model Number
Input (Btu)
GMDA50-E3A
GMDA75-E4A
GMDA75-E3A
GMDA100-E3A
GMDA100-E5A
GMDA125-E5A
GMDA150-E5A
Tons
50,000
3
75,000
4
75,000
3
100,000
3
100,000
5
125,000
5
150,000
5
92-24161-65-02
SUPERSEDES 92-24161-65-01
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Table of Contents
Related Manuals for Heat Controller GMUH
Summary of Contents for Heat Controller GMUH
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Page 1: Installation Instructions
HEAT CONTROLLER INSTALLATION INSTRUCTIONS FOR INDUCED DRAFT GAS FURNACES GMUH UPFLOW/HORIZONTAL SERIES GMDA DOWNFLOW SERIES Upflow/Horizontal Models Downflow Models Model Number Input (Btu) Tons Model Number Input (Btu) Tons GMUH50-E3A 50,000 GMDA50-E3A 50,000 GMUH75-E3A 75,000 GMDA75-E4A 75,000 GMUH75-E4A 75,000 GMDA75-E3A... -
Page 2: Installation Checklist
Before beginning any troubleshooting procedure, complete the following installation checklist. A furnace malfunction is sometimes caused by an improper installation. By completing this checklist, the problem may be found and corrected. Make copies of the checklist and complete one for every Low Profile Furnace service call for your records. INSTALLATION CHECKLIST (Refer to this manual for specifics.) GAS SUPPLY... -
Page 3: Table Of Contents
Important: All manufacturer products CONTENTS meet current Federal OSHA Guidelines for safety. California Proposition 65 Installation Check List ....................2 warnings are required for certain products, which are not covered by the Safety Information ....................4 OSHA standards. General Information ....................8 California's Proposition 65 requires warnings for products sold in California Location Requirements and Considerations ............9 that contain, or produce, any of over... -
Page 4: Safety Information
SAFETY INFORMATION WARNING WARNING WARNING IF THE INFORMATION IN THESE COMBUSTION PRODUCTS MUST INSTRUCTIONS IS NOT BE DISCHARGED OUTDOORS. — Do not store or use gasoline or other FOLLOWED EXACTLY, A FIRE OR CONNECT THIS FURNACE TO AN flammable vapors and liquids, or EXPLOSION MAY RESULT, APPROVED VENT SYSTEM ONLY, other combustible materials in the... - Page 5 WARNING WARNING WARNING DUCT LEAKS CAN CREATE AN DOWNFLOW UNIT DESIGN IS WHEN THIS FURNACE IS UNBALANCED SYSTEM AND DRAW CERTIFIED FOR INSTALLATION ON INSTALLED IN A RESIDENTIAL NON-COMBUSTIBLE FLOOR. A POLLUTANTS SUCH AS DIRT, DUST, GARAGE, IT MUST BE INSTALLED SPECIAL COMBUSTIBLE FLOOR FUMES AND ODORS INTO THE SO THE BURNERS AND IGNITION...
- Page 6 WARNING WARNING WARNING THE DOWNFLOW FURNACE DEVICES ATTACHED TO THE FLUE NEVER ALLOW PRODUCTS OF DESIGN IS CERTIFIED FOR OR VENT FOR THE PURPOSE OF COMBUSTION OR THE FLUE INSTALLATION ON A NON- REDUCING HEAT LOSS UP THE PRODUCTS TO ENTER THE COMBUSTIBLE FLOOR.
- Page 7 WARNING WARNING CAUTION DO NOT CONNECT THIS FURNACE IT IS IMPORTANT THAT EACH DUCT THE CABINET MUST BE TO A CHIMNEY USED TO VENT A SYSTEM BE SIZED AND INSTALLED PERMANENTLY GROUNDED. A SOLID FUEL APPLIANCE (WOOD OR FOR THE SPECIFIC APPLICATION BY GROUND SCREW IS PROVIDED IN COAL).
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Page 8: General Information
GENERAL INFORMATION NOTE: Always perform a proper heat The 80% gas furnaces are design Installation of Air Conditioning and certified by CSA for use with natural and loss calculation before specifying the Ventilating Systems 1985 or latest propane gases as follows: furnace size. -
Page 9: Location Requirements And Considerations
• IF AIR-MOVING EQUIPMENT OR LOCATED IN ANY AREA OF A STRUCTURE WHERE DAMAGE TO DUCTWORK IS LOCATED IN opening. Caulking is required to THE BUILDING OR BUILDING SPACES CONTAINING FUEL prevent air leakage into and CONTENTS MAY OCCUR AS A BURNING APPLIANCES SUCH AS condensate from forming inside the RESULT OF AN OVERFLOW OF THE... - Page 10 FIGURE 3 UPFLOW/HORIZONTAL DIMENSIONS...
- Page 11 FIGURE 4 DOWNFLOW DIMENSIONS...
- Page 12 TABLE 1 CLEARANCE – DUCTING FURNACE BASE BASE ACCESSIBILITY WIDTH PLATE NO. PLATE SIZE Proper air flow is required for the correct operation of this furnace. Too The design of forced air furnaces with 14” RXGB-D14 x 23 ” ” little air flow can cause erratic input ratings as listed in the tables on ”...
- Page 13 WARNING FAILURE TO PREVENT PRODUCTS OF COMBUSTION FROM BEING b. If summer air conditioning is A SOLID METAL BASE PLATE, (SEE CIRCULATED INTO THE LIVING desired, position the indoor coil on TABLE 1) MUST BE IN PLACE WHEN SPACE CAN CREATE POTENTIALLY the bottom of the unit.
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Page 14: Combustion And Ventilation Air
FIGURE 6 • Commercial buildings HORIZONTAL RETURN AIR DUCT • Buildings with indoor pools (LEFT-HAND AIRFLOW POSITION SHOWN) • Furnaces installed in laundry rooms • Furnaces in hobby or craft rooms • Furnaces installed near chemical storage areas. AIRFLOW Exposure to the following substances in the combustion air supply may also require OUTDOOR AIR for combustion:... - Page 15 FIGURE 8 Combustion air must be free of acid AIR FROM ATTIC/CRAWL SPACE forming chemicals; such as sulphur, fluorine and chlorine. These elements are found in aerosol sprays, detergents, bleaches, cleaning solvents, air fresheners, paint and varnish removers, refrigerants and many other commercial and household products.
- Page 16 FIGURE 9 COMBUSTION AIR FITTING – NON-ATTIC COMBUSTION AIR PULL, UPFLOW/HORIZONTAL MODELS ONLY ATTACH OPTIONAL DOUBLE ELBOW TO TOP INLET AIR OPENING TO PREVENT ACCIDENTAL BLOCKAGE OF INTAKE OPENING. THIS IS NOT A REQUIREMENT. (SEE PREVIOUS PAGE.) SINGLE ELBOW IS ALLOWED BUT MAY NOT PREVENT DEBRIS FROM BEING DROPPED INTO THE FURNACE.
- Page 17 FIGURE 10 OUTSIDE AIR USING A HORIZONTAL INLET & OUTLET B: Method 3, Upflow/Horizontal models only For the optimum in quiet operation, attic air may be brought directly to the furnace. IMPORTANT: In applications using NOTE: Maximum length of pipe that Method 3 for combustion air, the attic If attic combustion air is used, the inlet must be ventilated by gable or soffit...
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Page 18: Vent Pipe Installation
FIGURE 12 VENTING ATTACHING TO DRAFT INDUCER COLLAR GENERAL INFORMATION The furnace must be vented in accordance with these instructions, National Fuel Gas Code, ANSI Z223.1 and/or the Natural Gas Installation Code, CSA-B149.1 & .2 and requirements or codes of the local utility or other authority having jurisdiction. - Page 19 FIGURE 13 “B-1” VERTICAL VENTING TYPICAL VENTING WITH “B-1” VENT Type “B-1” vents must be installed in accordance with the terms of their listings and the vent manufacturer’s instructions. “B-1” vents must be supported and spaced in accordance with their listings and the manufacturer’s instructions.
- Page 20 POWER VENT SYSTEMS EXISTING VENT SYSTEMS the common venting system are located. Turn on clothes dryers and IMPORTANT RETROFIT When vertical venting is not possible, any appliance not connected to the VENTING INSTRUCTIONS the only acceptable method for common venting system. Turn on horizontal venting is with the use of installation, ALWAYS INSPECT the any exhaust fans, such as range...
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Page 21: Gas Supply And Piping
GAS SUPPLY AND PIPING FIGURE 15 GAS SUPPLY WARNING GAS PIPING INSTALLATION GAS PIPE INSTALLATION THIS FURNACE IS EQUIPPED AT THE FACTORY FOR USE ON GROMMET NATURAL GAS ONLY. CONVERSION (IN NORMAL POSITION) UPFLOW & DOWNFLOW TO LP GAS REQUIRES A SPECIAL MANUAL GAS VALVE (IN CLOSED POSITION) KIT AVAILABLE FROM THE... -
Page 22: Gas Pressure
GAS PRESSURE LP CONVERSION NOx MODELS IMPORTANT: The maximum gas NOTE: For installation, see specific LP When converting furnaces equipped with NOx inserts to LP gas, remove the supply pressure to the furnace should kit installation instructions. NOx insert assemblies. Steps for be 10.5”... - Page 23 FIGURE 16 SETTING GAS PRESSURE TYPICAL HOSE CONNECTION TO LINE PRESSURE TAP The maximum gas supply pressure to the furnace should be 10.5”w.c. natural gas, or 13”w.c. LP gas. The minimum supply gas pressure to the gas valve should be 5" w.c. natural gas or 11" w.c.
- Page 24 LP GAS: ADJUSTING OR CHECKING Check of input is important to prevent Furnaces for use on LP gas, the LP gas over firing of the furnace beyond its FURNACE INPUT CAUTION supply pressure must be set between design-rated input. NEVER SET INPUT 11.0”...
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Page 25: Electrical Wiring
FIGURE 17 ELECTRICAL WIRING ISOLATION RELAY NOTE: Electric to furnace must be supplied by a commercial utility. WARNING Proper voltage is 110-125 volts. TURN OFF ELECTRIC POWER AT THE FUSE BOX OR SERVICE PANEL BEFORE MAKING ANY ELECTRICAL CONNECTIONS. ALSO, THE GROUND CONNECTION MUST BE COMPLETED BEFORE MAKING LINE VOLTAGE CONNECTIONS. -
Page 26: Accessories
UT ELECTRONIC CONTROLS FIGURE 18 1028-928 CONTROL BOARD LINE VOLTAGE CONNECTIONS UT ELECTRONIC CONTROLS 1097-200 CONTROL BOARD 1. Single Stage Operation (See Figure 16) a. Control board "ONE" is on furnace connected to the thermostat. b. The 24 VAC supply to both control boards must be in phase with each other. -
Page 27: High Altitude Installations
80+ HIGH ALTITUDE Orifice required at Sea Level: #43 The NFGC guidelines are used with the following exception: INSTRUCTIONS From Table F.4 of National Fuel Gas Code Handbook, 2002 The recommended LP Gas high (TABLES 6 & 9) CAUTION altitude orifice selections differ slightly Orifice required at 5000 ft. - Page 28 ORIFICE ORDERING ALTERNATE METHOD FOR INFORMATION CANADIAN HIGH-ALTITUDE DERATE Orifice sizes are selected by adding the 2-digit drill size required in the orifice In Canada, unless an orifice change is part number. Drill sizes available are 39 specifically mandated by local codes, through 64;...
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Page 30: Start-Up Procedure
START-UP PROCEDURE WARNING LIGHTING INSTRUCTIONS the inducer for a pre-purge of 30 SHOULD OVERHEATING OCCUR OR seconds. After the pre-purge, the THE GAS SUPPLY FAIL TO SHUT This appliance is equipped with a direct igniter energizes and the gas valve OFF, SHUT OFF THE MANUAL GAS spark ignition device. - Page 31 FIGURE 20 SETTING BLOWER TIMINGS GAS FURNACE (DIRECT *NOTE: These taps are not available on UT Electronic Controls 1097-200 DRIVE) INSTRUCTIONS FOR BLOWER OFF TIMINGS CHANGING BLOWER SPEED UT Electronic Controls 1097-200. NOTE: This does not apply to UT WARNING Electronic Controls 1097-200 models DISCONNECT THE ELECTRICAL because the heat tap functions as the...
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Page 32: Air Flow
FIGURE 21 AIR FLOW TEMPERATURE RISE MEASUREMENT The importance of proper air flow over the heat exchanger cannot be over emphasized. CAUTION IT IS IMPORTANT THAT EACH DUCT SYSTEM BE SIZED AND INSTALLED FOR THE SPECIFIC APPLICATION BY PROPERLY APPLYING THE APPROPRIATE INDUSTRY ACCEPTED STANDARD. -
Page 33: Blower Performance Data
BLOWER PERFORMANCE DATA – UPFLOW/HORIZONTAL MODELS CFM [L/s] AIR DELIVERY BLOWER MOTOR BLOWER EXTERNAL STATIC PRESSURE INCHES [kPa] WATER COLUMN TONS INPUT SIZE H.P. SPEED [mm] .1 [.02] .2 [.05] .3 [.07] .4 [.10] .5 [.12] .6 [.15] .7 [.17] 675 [319] 655 [309] 635 [300]... -
Page 34: Safety Features
SAFETY FEATURES LIMIT CONTROL ROLL-OUT SAFETY PRESSURE SWITCH SWITCHES The high limit cut-off temperature is set This furnace is equipped with a at the factory and cannot be adjusted. normally-open pressure switch that Furnaces are equipped with safety The temperature setting prevents the monitors pressure conditions within the switches to protect against roll-out air temperature leaving the furnace... -
Page 35: Maintenance
TABLE 10 FILTER SIZES MAINTENANCE *NOTE: Some filters WARNING UPFLOW FILTER SIZES AS SHIPPED must be ordered or DISCONNECT MAIN ELECTRICAL PART FURNACE INPUT BOTTOM SIDE resized to fit certain QUANTITY WIDTH BTUH SIZE SIZE POWER TO THE UNIT BEFORE units and ATTEMPTING ANY MAINTENANCE. - Page 36 FIGURE 24 UPFLOW FILTER RETAINING ROD (SIDE RETURN) FILTER 45-24095-01 FILTER ROD SUPPORT ANGLE AE-60520-01 FILTER SUPPORT ANGLE AE-61883-01 FILTER AND ROD ASSEMBLY CUT-OUT AND DRILL DETAIL FILTER ROD SUPPORT ANGLE AE-60520-01 FILTER SUPPORT ANGLE (SEE ANGLE DETAIL) AE-61883-01 ROD & FILTER SUPPORT ANGLE ASSEMBLY SOLID BOTTOM MAY BE ORDERED FROM THE FACTORY.
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Page 37: Replacement Parts
WARNING SYSTEM OPERATION LUBRICATION HOLES IN THE VENT PIPE OR HEAT INFORMATION EXCHANGER CAN CAUSE TOXIC The indoor blower motor and induced FUMES TO ENTER THE HOME draft motor are prelubricated by the Advise The Customer To: RESULTING IN CARBON MONOXIDE motor manufacturer and do not require POISONING OR DEATH. -
Page 38: Troubleshooting
FIGURE 27 TROUBLESHOOTING FLOWCHART INTEGRATED FURNACE CONTROL (IFC) WARNING TROUBLESHOOTING GUIDE HAZARDOUS VOLTAGE DISCONNECT POWER BEFORE SERVICING. NOTE: Most failures are not due to the IFC. Double check all other LINE VOLTAGE SERVICE MUST BE BY A TRAINED, QUALIFIED CONNECTIONS possibilities, including the ground connection, before replacing the IFC. - Page 39 FIGURE 28 FOR MODELS WITH UT ELECTRONIC CONTROLS 1027-200 INTEGRATED FURNACE CONTROL AND DIRECT SPARK IGNITION...
- Page 40 CM 0810...