Shown on the tab | Lennox Hearth MPD-33 Series, MPD-45 Series

b. Attach manometer to the manifold side pressure test fitting and verify manifold pres- sure reads 3.5 inches water column (0.87 kPa) for natural gas, and 10.0 inches water column (2.49 kPa) for propane gas.

c. Convert the pilot orifice as follows (see Figures 62, 63 and 64 ):

Note - Use extra care not to engage the orifice strip with the 7/16" open end wrench (contact- ing the orifice strip could cause strip distortion rendering the pilot inoperative). Also avoid wrench contact to any of the other pilot parts.

Use a 7/16" open end wrench and turn the pilot hex fitting counter-clockwise 1/4 turn. (See

Figure 62).

Note - The orifice strip tab may be randomly located on any side of the hex fitting.

d. Push the orifice strip tab all the way against

the hex fitting to align the appropriate gas type

orifice (see Figures 63 and 64). The type of

gas for which the pilot is set, is, the gas type

Pilot for Honeywell Millivolt Gas Valve

(Loosening of Hex Fitting For Orifice Strip Tab Positioning)

Hood	Hood Alignment

7/16 in. Open End Wrench

	Orifice Strip Tab
	Take Care Not to Contact the Orifice Strip Tab
Figure 62	with the Hex Fitting Wrench - Distortion of the Tab
Figure 62	May Render the Pilot Inoperative.


	Pilot for Honeywell Millivolt Gas Valve
	Orifice Strip Tab Position Identification
	For LP/Propane and Natural Gas

shown on the tab.

e. Retighten, clockwise, the pilot hex fitting

until the pilot hood aligns with the thermo-

couple and thermopile as indicated by the

arrows shown in Figure 62.

LP/Propane Gas Position -

1/16 in. Hole, LP and

Red Color shown on tab

Natural Gas Position -

NAT shown on tab

NAT

Figure 63	Top View of Hex Fitting and Orifice Strip Tab
Figure 63


	Pilot for Honeywell Millivolt Gas Valve
	Orifice Strip Tab Positioning
	Pilot Hood Position After
	Loosening Hex Fitting 1/4 Turn
	Orifice Strip Tab
	Push Tab to Set
	Gas Type Usage
	Note - Orifice Strip Tab May
	Be Randomly Located On Any
Figure 64	Side Of The Hex Fitting
Figure 64

NOTE: DIAGRAMS & ILLUSTRATIONS NOT TO SCALE.

MPD-35 Series, MPD-45 Series, MPD-33 Series, MPD-40 Series specifications

The Lennox Hearth MPD-33, MPD-40, MPD-45, and MPD-35 Series are sophisticated and innovative products designed for both aesthetic appeal and functional heating efficiency. These multi-sided gas fireplaces are engineered to bring warmth and style to any space, making them a popular choice for homeowners looking to enhance their living environment.

One of the standout features of the MPD Series is their versatile design. Each model is available in different sizes with stylish options, catering to various room dimensions and decor styles. The MPD-33, MPD-40, and MPD-45 models provide flexibility in installation, while the MPD-35 offers extra depth for a more pronounced fire presence, making them suitable for both contemporary and traditional interiors.

A key characteristic of the Lennox Hearth MPD Series is its high-efficiency operation. These fireplaces are designed to maximize heat output while minimizing fuel consumption, resulting in lower energy bills. The innovative burner system produces a realistic flame effect that can be adjusted to create the perfect ambiance for any occasion. The use of advanced technology ensures that the heat generated is evenly distributed, enhancing overall comfort.

Safety is paramount in the design of the MPD Series. Each model is equipped with a state-of-the-art safety shut-off system that activates if the flame goes out, ensuring peace of mind for users. Additionally, the glass front not only provides a clear view of the flames but is designed to stay cool to the touch, making it safe for families with children and pets.

The efficiency of these models is further complemented by an optional remote control feature, allowing users to adjust the flame height and thermostat settings with ease. The MPD Series is also compatible with smart home systems, providing users with added convenience.

Overall, the Lennox Hearth MPD-33, MPD-40, MPD-45, and MPD-35 Series exemplify the perfect combination of efficiency, safety, and design. Their ability to blend function with visual appeal makes them an ideal choice for creating a cozy atmosphere in any room, from living areas to bedrooms. These fireplaces stand as a testament to Lennox's commitment to quality and innovation in home heating solutions. With advanced technologies and a focus on user comfort, the MPD Series is designed to meet the needs of modern homeowners seeking reliable and stylish heating options.

Lennox Hearth MPD-33 Series Pilot for Honeywell Millivolt Gas Valve, Shown on the tab

Models: MPD-35 Series MPD-45 Series MPD-33 Series MPD-40 Series