Enerco MHU 75, MHU 45 Venting Using a Masonry Chimney, Removal of Unit from Common Vent

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INDUCED DRAFT BLOWER

HORIZONTAL VENTING - RESIDENTIAL INSTALLATION

UPWARD SLOPE

 

12 INCHES

 

MIN. (30.5CM)

 

FLUE TRANSITION

 

(PROVIDED)

VENT TERMINATION CAP

LISTED THIMBLE THROUGH

COMBUSTION WALL

MAY BE SINGLE WALL (26 GSG) GALV. OR EQUIV. STAINLESS

STEEL SEALED ACCORDING TO THESE INSTALLATION

INSTRUCTIONS OR A SINGLE SECTION OF TYPE B-1 VENT.

SLOPED: + 1/4 INCH FOR 1 FOOT RUN MINIMUM.

NOTE - MINIMUM HORIZONTAL LENGTH 3FT. (914MM), NOT INCLUDING CAP FOR TERMINATION.

MAXIMUM HORIZONTAL LENGHT 5FT. (1.5M) PLUS ONE 90-

DEGREE ELBOW.

COMMON VENTING NOT ALLOWED WHEN HORIZONTALLY VENTING THE UNIT HEATER.

FIGURE 6

F – VENTING USING A MASONRY CHIMNEY

The following additional requirements apply when a lined masonry chimney is being used to vent the compact unit heater.

1.Masonry chimneys used to vent Category I units heaters must be either tile-lined or lined with a listed metal lining system or dedicated gas vent. Unlined masonry chimneys are prohibited. A category I appliance must never be connected to a chimney that is servicing a solid fuel appliance. If a fireplace chimney flue is used to vent this appliance, the fireplace opening must be permanently sealed.

2.A fan assisted unit heater may be commonly vented into an existing lined masonry chimney provided:

•The chimney is currently serving at least one draft-hood equipped appliance.

•The vent connector and chimney are sized in accordance with venting tables in the (American) National Fuel Gas Code ANSI Z223.1 or (Canada) CSA B149.1 Natural Gas and Propane Installation Code.

IMPORTANT Single appliance venting of a fan assisted unit heater into a tile lined masonry chimney (interior or outside wall) is prohibited. The chimney must first be lined with either type B-1 vent or an insulated single wall flexible vent lining system, sized in accordance with venting tables in the (American) National Fuel Gas Code ANSI Z223.1 or (Canada) CSA B149.1 Natural Gas and Propane Installation Code.

3.A type B-1 vent or masonry chimney liner shall terminate above the roof surface with a listed cap or a listed roof assembly in accordance with the terms of their respective listings and the vent manufacturer’s instructions.

4.Do not install a manual damper, barometric draft regulator, or flue restrictor between the unit heater and the chimney.

5.If type B-1 double-wall vent is used inside a chimney, no other appliance can be vented into the chimney. Outer wall of type B-1 vent pipe must not be exposed to flue products.

6.Insulation for the flexible vent pipe must be an encapsulated fiberglass sleeve recommended by the flexible vent pipe manufacturer.

7.The space between liner and chimney wall should NOT be insulated with puffed mica or any other loose granular insulating material.

8.If type B-1 vent or an insulated flexible vent pipe cannot be used as liners, the chimney must be rebuilt to accommodate one of these methods or some alternate approved method must be found to vent the appliance. When inspection reveals that an existing chimney is not safe for the intended purpose, it shall be rebuilt to conform to nationally recognized standards, lined or relined with suitable materials or replaced with a gas vent or chimney suitable for venting unit heaters. The chimney passageway must be checked periodically to ensure that it is clear and free of obstructions.

G – REMOVAL OF UNIT FROM COMMON VENT

In the event that an existing unit heater is removed from a venting system commonly run with separate gas appliances, the venting system is likely to be too large to properly vent there maining attached appliances. The following test should be conducted while each appliance is in operation and the other appliances are not in operation, yet remain connected to the common venting system. If the venting system has been installed improperly, the system must be corrected.

1.Seal any unused openings in the common venting system.

2.Visually inspect the venting system for proper size and horizontal pitch. Determine there is no blockage or restriction, leakage, corrosion, or other deficiencies which could cause an unsafe condition.

3.In so far as is practical, close all building doors and windows and all doors between the space in which the appliances remaining connected to the common venting system are located and other spaces of the building. Turn on clothes dryers and any appliances not connected to the common venting system. Turn on any exhaust fans, such as rangehoods and bathroom exhausts, so they will operate at maximum speed. Do not operate a summer exhaust fan. Close fireplace dampers.

4.Follow the lighting instructions. Place the appliance being inspected in operation. Adjust thermostat so appliance will operate continuously.

Enerco Compact Unit Heater

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Operating Instructions and Owner’s Manual

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Contents MR. Heater Contents General Hazard WarningMHU45/MHU75 and HSU45/HSU75 Unit Dimensions TOP ViewBack View Side View START-UP and Performance Check ListGarage Installations ShippingRequirements CSA in the USA Requirements CSA in CanadaUnit Heater Installation Install Unit HeaterCombustion and Ventilation AIR VentingHorizontal Venting General Vent Termination on Single Wall VentCondensate Drain Through TEE Pipe and Drain Loop Horizontal Venting CommercialHorizontal Venting Residential Removal of Unit from Common Vent Venting Using a Masonry ChimneyHorizontal Venting Residential Installation Line Voltage Field Wiring Electrical ConnectionsGAS Supply Connection GAS Supply to Unit HeaterGAS Connection Leak CheckStart UP and Operation Unit START-UPAdjustments Service Ladder Diagram Wire DiagramParts List Enerco Compact Unit Heater Parts Ordering Information For Information Regarding ServiceLimited Warranty

MHU 45, MHU 75 specifications

Enerco is a renowned name in the heating industry, particularly famous for its innovative line of forced air propane heaters. The Enerco MHU 45 and MHU 75 models are among the top choices for both residential and commercial heating needs, showcasing a range of advanced features and technologies designed for efficient performance and user convenience.

The MHU 45 and MHU 75, as their names suggest, deliver heating outputs of 45,000 BTU and 75,000 BTU respectively, making them suitable for a variety of applications, from small workshops to larger industrial spaces. Both models are equipped with a powerful fan that ensures even heat distribution, rapidly warming up an area while maintaining energy efficiency.

One of the standout features of the MHU series is their lightweight and portable design, allowing users to easily move the heaters from one location to another. This is particularly beneficial in a work environment where heating needs may vary based on project demands. The integrated handle and rubber feet add to the convenience, ensuring stability during operation.

The MHU series also incorporates safety technologies that have been meticulously designed to protect both the unit and the user. Both models are equipped with a built-in safety shut-off valve that automatically turns the heater off in the event of a tip-over or overheating, providing peace of mind for users.

Efficiency is a key characteristic of the Enerco MHU heaters. They utilize propane fuel for combustion, which tends to burn cleaner than other fossil fuels. This not only contributes to a reduced environmental impact but also translates to savings on energy costs for users. The MHU 45 and MHU 75 feature adjustable heat settings, which allow for customized heating to match specific needs, further enhancing their efficiency.

In terms of runtime, the MHU series offers impressive performance. The fuel consumption is optimized to ensure users can rely on these heaters for extended periods without frequent refueling interruptions.

In summary, the Enerco MHU 45 and MHU 75 are powerful, portable, and efficient propane heaters designed to deliver excellent performance in a variety of settings. With their robust safety features, lightweight design, and ability to provide rapid heat distribution, they stand out as exceptional choices for those seeking reliable heating solutions. Whether for industrial, commercial, or residential use, these models underline Enerco's dedication to quality and innovation in heating technology.
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