Enerco MHU 45, MHU 75 Combustion and Ventilation AIR, Venting, Unit Heater Installation

Page 5

These units are approved for residential applications. For installation in a residential garage, these units must be installed so that burners and ignition source are located no less than 18” (457mm) above floor. Heater must be located or protected to avoid physical damage by vehicles. Refer to CSA B149.1, Natural Gas and Propane Installation Code current edition.

In a confined area, the heater must be installed in accordance with the CSA B149.1, Natural Gas and Propane Installation Code. Be sure to check with local codes and ordinances for additional requirements.

UNIT HEATER INSTALLATION

The installation shall conform with local building codes or, in the absence of local codes, with the National Fuel Gas Code, ANSI Z223.1 /

NFPA 54 or the CSA B 149.1, Natural Gas and Propane Installation Code.

The appliance and venting system is to be inspected once a year by a qualified service agency.

Unit is shipped ready for installation. Unit may be installed

as shown in figure 1 or inverted 180 o depending on desired location as governed by clearances, vent connection, air direction, gas supply, electrical supply and service accessibility.

1.If installing unit in an inverted position: Remove and retain screws securing door and rotate door 180o. Secure with retained screws. Rotate louvers directing airflow as desired.

2.Choose location for mounting brackets.

3.Remove and retain three screws along top edge (bottom edge when inverted) of front of unit.

4.Align screw holes on mounting bracket with holes along top edge (either upright or inverted) of unit. Secure one mounting bracket to front of unit with retained screws. Secure other mounting bracket to back of unit with screws provided in bag assembly containing flue transition.

5.To support unit, secure mounting bracket to ceiling joist or truss. Unit may also hang on rods as shown in figure 1 .

INSTALL UNIT HEATER

SUPPORT

MOUNTINGRODS

BRACKETS (2)

FIGURE 1

COMBUSTION AND VENTILATION AIR

Adequate facilities for supplying air for combustion and ventilation must be provided in accordance with the latest edition of section 5.3, Air for Combustion and Ventilation, of the

National Fuel Gas Code, ANSI Z223.1, in the U.S.A., CSA B149.1 Natural Gas and Propane Installation Code in Canada,

or applicable provisions of local building codes.

All gas fired appliances require air to be used for the combustion process. In many buildings today, there is a negative indoor air pressure caused by exhaust fans, etc. If sufficient quantities of combustion air are not available, the heater or another appliance will operate in an inefficient manner, resulting in incomplete combustion which can result in the production of excessive carbon monoxide.

CAUTION Insufficient combustion air can cause headaches, nausea, dizziness, asphyxiation or death.

If indoor air is to be used for combustion, it must be free of the following substances or the life of the heat exchanger will be adversely affected: chlorine, carbon tetrachloride, cleaning solvent, halogen refrigerants, acids, cements and glues, printing inks, fluorides, paint removers, varnishes, or any other corrosives.

VENTING

A – GENERAL RECOMMENDATIONS AND REQUIREMENTS

NOTE: The vent is a passageway, vertical or nearly so, used to convey flue gases from an appliance, or its vent connector, to the outside atmosphere. The vent connector is the pipe or duct that connects a fuel-gas burning appliance to a vent or chimney.

Unit heaters must be vented in compliance with all local codes or requirements of the local utility, the current standards of the (American) National Fuel Gas Code, ANSI Z223.1 or (Canada) CSA B149.1 Natural Gas and Propane Installation Code, and the following instructions.

A metal stamped/extruded transition is supplied with this certified unit. It must not be modified or altered and must be installed on the outlet of the induced draft blower assembly prior to the installation of the vent or vent connector. Failure to comply with this requirement will void the certification of the unit by the approval agencies. All joints shall be secured with at least two corrosion resistant screws. All joints must be checked for gas tightness after installation.

TABLE 2

MAXIMUM VENT LENGTHS

HORIZONTAL VENTS

No. of

ft

m

Elbows

 

 

1

25

7.6

2

20

6.1

3

15

4.6

4

10

3.0

5

5

1.5

Maximum length of vent connector not to exceed 30 ft. (9.1m).

Enerco Compact Unit Heater

5

Operating Instructions and Owner’s Manual

Page 4 Page 6
Image 5
Page 4 Page 6
Contents MR. Heater General Hazard Warning ContentsTOP View MHU45/MHU75 and HSU45/HSU75 Unit DimensionsBack View Side View START-UP and Performance Check ListShipping Garage InstallationsRequirements CSA in the USA Requirements CSA in CanadaInstall Unit Heater Unit Heater InstallationCombustion and Ventilation AIR VentingVent Termination on Single Wall Vent Horizontal Venting GeneralCondensate 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 Electrical Connections Line Voltage Field WiringGAS Supply Connection GAS Supply to Unit HeaterLeak Check GAS ConnectionStart UP and Operation Unit START-UPAdjustments Service Wire Diagram Ladder 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.
Top Page Image Contents