5.Vent termination must be a minimum of 4' (1.2m) below or 4’ (1.2m) horizontally from any soffit vent or under-eave vent.

6.Vent must be a minimum of 6' from an inside corner formed by two exterior walls. If possible, leave a 10' clearance.

7.Vent termination must be a minimum of 10' (3m) from any forced air inlet (includes fresh air inlet for other appliances, such as a dryer).

8.When termination is routed through an exterior combustible wall the vent must be supported using a listed clearance thimble. Where local authorities permit, a single section of type B-1 vent pipe may be used as an alternative to the thimble. When using a type B-1 vent termination use the clearances specified by the vent manufacturer. Seal the connection between the single wall and double wall pipes and the annular space of the double wall pipe as shown in figure 2. Inside edge of vent termination tee must be at least 12 inches from outside wall as shown in figure 3 .

9.For horizontal venting, the vent pipe shall be supported with hangers no more than 3ft. (1m) apart to prevent movement after installation.

D – HORIZONTAL VENTING – COMMERCIAL

1.Horizontal commercial installations are for buildings which are not attached to living spaces. The vent may be single wall vent material installed according to the sections

Venting A - General Recommendations and Requirements and C - Horizontal Venting General and

D - Horizontal Venting - Commercial. Refer to figure 3.

2.The vent pipe diameter for horizontal commercial installations shall be 4" (101mm) on the 45 and 75units. In all cases a flue transition piece (supplied) is required to fit over the outlet of the induced draft assembly on the appliance.

3.Refer to table 2 for maximum vent connector lengths.

4.Select a wall termination point that will maintain ¼” rise per foot slope of horizontal run of vent pipe. The vent may be single wall material minimum 26 GSG (0.46mm) galvanized steel or equivalent grade stainless steel. Seal single wall vent material according to the section A - General

Recommendations and Requirements.

5.For upward sloped vent a condensate tee and drain must be installed within the first 5’ (1.5m) from the unit heater to protect the appliance. If a flexible condensate drain line is used, the drain line must include a loop entering the structure. If the unit is shut down for an extended period of time and will be exposed to sub-freezing temperatures, the condensate may freeze.

E – HORIZONTAL VENTING – RESIDENTIAL

1.For horizontal residential installations these units are certified as Category I appliances. The vent may be single wall material minimum 25 GSG (0.46mm) galvanized steel or equivalent grade stainless steel. Venting A - General Recommendations and Requirements and C - Horizontal Venting General and E - Horizontal Venting - Residential. Refer to figure 6 .

2.The vent pipe diameter for horizontal residential installations shall be 4" (101mm) on both 45 and 75 units. A standard vent transition is required at unit in addition to the transition supplied with the unit.

3.The maximum vent length is 5’ (1.5m) plus one 90-degree elbow.

4.The vent must maintain a ¼” rise per foot of slope upwards toward the termination.

CONDENSATE DRAIN THROUGH TEE PIPE AND DRAIN LOOP

UPWARD SLOPE ON HORIZONTAL VENT-COMMERCIAL INSTALLATION

MAY BE SINGLE WALL (26 GSG) GALV. OR EQUIV. STAINLESS STEEL SEALED ACCORDING TO THESE INSTALLATION INSTRUCITONS. SLOPE: + 1/4 INCH FOR 1 FOOT RUN MINUMUM.

 

FLUE TRANSITION

 

(PROVIDED)

 

LISTED THIMBLE

 

THROUGH COMBUSTIBLE

 

WALL

INDUCED DRAFT BLOWER

 

NOTE - MINIMUM HORIZONTAL LENGHT 3 FT. (914MM),

 

NOT INCLUDING CAP FOR TERMINATION. REFER TO

DRAIN LOOP WITH WATER

TABLE 2 FOR MAXIMUM LENGTH AND NUMBER OF

TRAP (TO CONDENSATE DRAIN)

ELBOWS.

 

12 INCHES MIN.

(30.5 CM)

VENT TERMINATION

CAP

12” (30.5 CM)

MINIMUM ABOVE ALL HIGHEST SNOWFALL

COMMON VENTING NOT ALLOWED WHEN HORIZONTALLY VENTING THE UNIT HEATER

FIGURE 3

Enerco Compact Unit Heater

7

Operating Instructions and Owner’s Manual

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Enerco MHU 45, MHU 75 owner manual Horizontal Venting Commercial, Horizontal Venting Residential
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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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