Enerco MHU 75, MHU 45 owner manual Horizontal Venting General, Vent Termination on Single Wall Vent

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B – VERTICAL VENTS USING METAL VENT PIPE

–COMMERCIAL AND RESIDENTIAL INSTALLATIONS

MHU/HSU compact unit heaters are listed as Category I appliances for vertical vent installations.

1.MHU/HSU unit heaters are to be used with NFPA- or ANSI- approved chimneys, U.L. listed type B-1 gas vents, single wall metal pipe, or listed chimney lining system for gas venting where applicable, as well as the modifications and limitations listed in figure 2 . Seal single wall vent material according to the section A - General Recommendations and Requirements.

2.The vent connector shall be 3" (76mm) diameter on 45 unit and 4” (100mm) diameter for the 75 unit. In all cases, a flue transition piece (supplied) is required to fit over the outlet of the induced draft assembly on the appliance.

3.Keep the vent connector runs as short as possible with a minimum number of elbows. Refer to the (American) National Fuel Gas Code ANSI Z223.1 or (Canada) CSA B149.1 Natural Gas and Propane Installation Code for maximum vent and vent connector lengths. Horizontal run of the vent connector from the induced draft blower to the chimney/vent cannot exceed the values in table 2 .

4.When the length of a single wall vent, including elbows, exceeds 5 feet (1.5m), the vent shall be insulated along its entire length with a minimum of 1/2" thick foil faced fiberglass 1-1/2# density insulation. If a single wall vent is used in an unheated area it shall be insulated. Failure to do so will result in condensation of flue gases.

5.The unit may be vented vertically as a single appliance or as a common vent with other gas-fired appliances. In common venting situations, vent connectors for other appliances must maintain a 4" (100mm) vertical separation between the vent connectors. Refer to common venting tables in the(American) National Fuel Gas Code ANSI Z223.1 or (Canada) CSA B149.1 Natural Gas and Propane Installation Code for proper vent size.

6.Clearance to combustible material is 6" (152mm) for single wall vent material except where a listed clearance thimble

is used. Clearance to combustible material for type B-1 vent or factory-built chimney is per manufacturer’s instructions.

7.The vent connector shall be supported without any dips or sags. Vertical vents shall be supported in accordance with their listing and manufacturers’ instructions. All horizontal vent connector runs shall have a slope up to the vertical vent of at least 1/4" per foot (1mm per 50mm).

8.All vertical type B-1 vents, single wall vents, or listed chimney lining system must be terminated with a listed ventcap or listed roof assembly.

9.The vent must extend at least 3' (1m) above the highest point where it passes through a roof of a building and at least 2’ (0.6m) higher than any part of a building within a horizontal distance of 10' (3.05m) unless otherwise specified by the (American) National Fuel Gas Code, ANSI Z223.1 or (Canada) CSA B149.1 Natural Gas and Propane Installation Code.

The vent must extend at least 5' (1.6m) above the highest connected equipment flue collar.

C – HORIZONTAL VENTING – GENERAL

Common venting is not allowed when horizontally venting the unit heater.

The minimum horizontal vent length is three feet (914mm).

1.If possible, do not terminate the horizontal vent through a wall that is exposed to prevailing wind. Exposure to excessive winds can affect unit performance. If such a termination is necessary, use a wind block to protect the vent termination from direct wind.

2.Vent termination must be free from obstructions and at least 12" (306mm) above grade level and maximum snow height.

VENT TERMINATION ON SINGLE WALL VENT

SINGLE WALL TERMINATION

ROOF FLASHING

ROOF PITCHED

FROM 0” TO 45”

2” CLEARANCE

SHALL NOT BE ATHIMBLE CONCEALED SPACE

DOUBLE WALL (TYPE B-1) TERMINATION

ROOF FLASHING

ROOF PITCHED

FROM 0” TO 45”

12” MAX

CLEARANCE TO BE AS

SPECIFIED ON TYPE “B”

VENT PIPE

SEAL JOINT BETWEEN SINGLE WALL VENT

AND “B”VENT AND THE ANNULAR SPACE OF THE “B” VENT

FIGURE 2

3.Do not terminate vent directly below roof eaves or above a walkway, or any other area where condensate dripping may be troublesome and may cause some staining. Avoid windows where steam may cause fogging or ice buildup.

4.When horizontally vented, minimum clearance for termination from any door, window, gravity air inlet, gas or electric meter, regulators, and relief equipment is 4 ft. (1.2m) for U.S. installations. Refer to NFPA 54/ANSI Z223.1 in the U.S.A. and CSA B149.1 Natural Gas and Propane Installation Code

in Canada or with authorities having local jurisdiction. In Canada, vent termination must have a minimum 6 ft. (1.8mm) horizontal clearance from gas and electric meters and relief devices as specified in the CSA B149.1, Natural Gas and Propane Installation Code.

Enerco Compact Unit Heater

6

Operating Instructions and Owner’s Manual

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Contents MR. Heater Contents General Hazard WarningBack View MHU45/MHU75 and HSU45/HSU75 Unit DimensionsTOP View Side View START-UP and Performance Check ListRequirements CSA in the USA Garage InstallationsShipping Requirements CSA in CanadaCombustion and Ventilation AIR Unit Heater InstallationInstall Unit Heater VentingHorizontal Venting General Vent Termination on Single Wall VentHorizontal Venting Commercial Horizontal Venting ResidentialCondensate Drain Through TEE Pipe and Drain Loop Venting Using a Masonry Chimney Horizontal Venting Residential InstallationRemoval of Unit from Common Vent GAS Supply Connection Line Voltage Field WiringElectrical Connections GAS Supply to Unit HeaterStart UP and Operation GAS ConnectionLeak Check Unit START-UPAdjustments Service Ladder Diagram Wire DiagramParts List Enerco Compact Unit Heater For Information Regarding Service Limited WarrantyParts Ordering Information

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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