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General| Brand | Heat Controller |
|---|---|
| Model | GMUH |
| Category | Furnace |
| Language | English |
Essential safety precautions for installation and operation, preventing hazards like fire, explosion, and injury.
Verifies proper pipe size, gas leaks, and pressure for gas supply.
Verifies thermostat, voltage, grounding, and other electrical connections.
Verifies vent pipe, material, clearance, and negative pressure.
Verifies proper source and opening size for combustion air.
Verifies clearances, air temperature rise, static pressure, and ducting.
Warnings about following instructions to prevent fire, explosion, and property damage.
Emphasizes installation by qualified personnel to avoid hazards.
Procedures for smelling gas and detecting leaks safely.
Importance of adequate air for combustion and ventilation.
Manufacturer is not responsible for mismatched or improperly installed equipment.
Advises using only approved methods for testing gas leaks, not open flames.
Requirements for ducting air to areas outside the furnace space.
Requirements for installing furnaces in residential garages to prevent ignition of vapors.
Warnings about duct leaks drawing pollutants into living spaces.
Explicitly prohibits installation in mobile homes due to fire risk.
Restrictions on installing upflow/horizontal units on combustible flooring without bases.
Strict clearance requirements around the furnace and vent pipe.
Ensures return air ducts are sealed to prevent combustion gas circulation.
Emphasizes operating the furnace only with the blower door in place.
Stresses the need for sufficient fresh air for proper combustion and ventilation.
Warning about toxic fumes from leaks causing carbon monoxide poisoning.
Prohibits connecting to chimneys used for solid fuel appliances.
Warnings against purging gas lines and using flames for leak checks.
Mandates disconnecting power before electrical connections for safety.
Requirement for permanent cabinet grounding via a provided screw.
Details CSA certification for natural and propane gases, Category I type.
Emphasizes installation per National Fuel Gas Code and local codes.
Explains AFUE as a measure of heat energy efficiency and its consumer benefits.
Discusses how duct system balance and sealing improve efficiency and IAQ.
Reiterates that the furnace is not approved for mobile home installation.
Prohibits taking return air from specific areas like bathrooms or garages.
Emphasizes sealing return air ducts to prevent combustion gas circulation.
Provides specific clearance dimensions to combustible materials for various models.
Details required clearances to combustible materials for downflow models.
Recommends at least 24 inches of service clearance in front of furnaces.
Prohibits installing upflow/horizontal units on combustible materials.
Requirements for downflow units on non-combustible or combustible floors.
Discusses proper duct sizing for airflow and avoiding damage.
Instructions for connecting return and supply air plenums for upflow units.
Requirement for a base plate with side air returns to prevent combustion gas circulation.
Instructions for connecting supply and return air plenums for downflow units.
Instructions for mounting and connecting ductwork for horizontal units.
Stresses the need for sufficient fresh air for proper combustion and ventilation.
Lists substances in air that may require outdoor air for combustion.
Details air volume requirements for unconfined spaces based on BTUH input.
Details air opening requirements for confined spaces based on BTUH input.
Air intake requirements when using outdoor air for combustion in confined spaces.
Details fittings and openings for upflow/horizontal models using PVC pipe.
Describes requirements for two permanent openings for combustion air.
Describes requirements for a single permanent opening for combustion air.
Instructions for optional attic air pull with fittings and pipe limitations.
General requirements for venting in accordance with codes and instructions.
Warning against using untested devices for reducing heat loss up the chimney.
Warning about pre-drilling holes for vent pipe attachment to prevent inducer damage.
Identifies the furnace as Category I type, explaining its operation.
Notes on inspecting existing vent systems and using proper vent pipe.
Details installation requirements for Type "B-1" vents, including support and spacing.
Requirements for terminating gas vents above the roof surface.
Prohibits connecting to chimneys used for solid fuel appliances.
Acceptable methods for horizontal venting using power venters.
Importance of inspecting existing vent systems before furnace replacement.
Steps for inspecting and testing existing vent systems for safe operation.
Warning about using only natural gas or proper LP conversion kits.
Mandates installation according to local, state, and utility codes.
Instructions for running separate supply lines and installing shut-off valves.
Advises using a back-up wrench and not overtightening connections.
Ensures the gas control valve is not subjected to high supply pressures.
Specifies maximum and minimum gas supply and manifold pressures for natural and LP gas.
Notes need for input rate adjustment and orifice recalculation at high altitudes.
Details conversion to LP gas using specific kits and qualified technicians.
Step-by-step guide for measuring gas pressure using a manometer.
Table showing capacity of natural gas pipes based on size, length, and pressure drop.
Table showing capacity of LP gas pipes based on size, length, and pressure drop.
Procedure to measure and determine the furnace's input rate.
Table to determine input rate based on meter time and gas heating value.
Mandates turning off power and completing ground connections before wiring.
Requirement for permanent cabinet grounding via a provided screw.
Discusses thermostat compatibility and the use of isolation relays.
Table for selecting appropriate wire size for 24-volt control circuits.
Important notes on twinning furnaces with identical control boards and using twinning kits.
Limitations on returns, capacity, phase, and thermostat usage for twinning.
Mandates compliance with local codes or NFGC at altitudes above 2000 ft.
Explains 4% de-rate per thousand feet for 80+ models using natural gas.
Chart for selecting natural gas orifice sizes based on altitude and heat value.
Chart for selecting LP gas orifices based on altitude.
Describes an alternate derate method for Canadian installations using manifold pressure.
Table for Canadian high-altitude derate of natural gas using orifice size and manifold pressure.
Table for Canadian high-altitude derate of LP gas using orifice size and manifold pressure.
Quick reference chart for natural gas orifice selection based on altitude and heat value.
Instructions on how to calculate high altitude orifice requirements.
Crucial safety checks before attempting to start the furnace.
Detailed sequence of operation for the direct spark ignition system.
Describes the lockout modes and how to reset the system.
Warning about disconnecting power before changing blower speed.
Caution against reducing heating speeds that could cause overheating.
Importance of checking air temperature rise after speed adjustments.
Emphasizes the importance of properly sized duct systems for furnace operation.
Explains how low airflow can cause heat exchanger failure due to overheating.
Steps to measure temperature rise in supply and return air ducts.
Actions to take if temperature rise is too high or too low.
Tables showing CFM output for upflow/horizontal models at various static pressures.
Tables showing CFM output for downflow models at various static pressures.
Explains the high limit control's role in preventing overheating.
Lists common reasons for a limit switch to open, often related to low airflow.
Describes the function of roll-out switches and their reset procedure.
Explains the pressure switch's role in monitoring the vent system.
Lists reasons why the pressure switch might not close properly.
Warning to disconnect main electrical power before performing maintenance.
Importance of proper filter placement and its effect on system components.
Recommends a single filter location in the return air duct system.
Advises keeping air filters clean and how to maintain them.
Discusses potential dust issues and soot damage from filters or lack thereof.
Details for installing filter retaining rods for side return upflow units.
Illustration of filter installation for downflow units.
Tips for customers to ensure efficient operation and maintenance.
Reinforces keeping combustible materials away from the furnace.
Recommends annual inspection of flue passageways, vent system, and burners.
Directs users to a troubleshooting flowchart for problem diagnosis.
Directs users to the wiring diagram for furnace and power sources.
Flowchart for diagnosing issues with the integrated furnace control.
Explains abbreviations and LED codes used in the troubleshooting flowchart.
Lists and defines various electrical component codes used in the diagrams.
Notes on factory wiring, field installed options, and wiring standards.
Detailed electrical wiring diagram for furnace configurations.
