Lennox Hearth MPD-35 Series, MPD-45 Series New York City, NY, Installation of Vent Restrictor

10

Massachusetts Horizontal Vent Requirements

In the Commonwealth of Massachusetts, hori- zontal terminations installed less than seven

(7)feet above the finished grade must comply with the following additional requirements:

•A hard wired carbon monoxide detector with an alarm and battery back-up must be installed on the floor level where the gas fireplace is installed. The carbon monoxide detector must comply with NFPA 720, be ANSI/UL 2034 listed and be ISA certified.

•A metal or plastic identification plate must be permanently mounted to the exterior of the building at a minimum height of eight (8) feet above grade and be directly in line with the horizontal termination. The sign must read, in print size no less than one-half (1/2) inch in size, GAS VENT DIRECTLY BELOW. KEEP CLEAR OF ALL OBSTRUCTIONS.

New York City, NY:

These fireplaces are approved for installation in New York City in the US state of New York.

The vent system may not service multiple appliances, and must never be connected to a flue serving a solid fuel burning appliance. The vent pipe is tested to be run inside an enclos- ing wall (such as a chase). There is no require- ment for inspection openings in the enclosing wall at any of the joints in the vent pipe.

Preparing the Appliance Vent Collar on MPD-3530/4035/4540 Series (Combined Top and Rear Vent) Models

Each of the unit's two vent collars are sealed with a cover plate and a seal plate and gasket. The cover, and seal plate and gasket must be removed from the vent collar being used. Refer to Figure 12 for top vent usage and Figure 13 for rear, and the following steps to prepare the appropriate collar for use.

From the vent collar being used, remove the four screws securing the vent seal plate and gasket. Remove and discard the seal plate and gasket.

When the top vent collar is being used, from inside the firebox, loosen the two screws in the keyhole slots of the cover plate and remove the remaining two cover plate securing screws. Remove and discard the cover plate. Reinstall and securely tighten all four screws.

When the rear vent collar is being used, from inside the firebox, remove the two screws securing the lintel to the rear wall of the fire- box, then remove the lintel. Remove the four cover plate securing screws. Remove and discard the cover plate.

Reinstall and securely tighten all four cover plate screws. Re-secure the lintel to the rear wall of the firebox.

WARNING: FAILURE TO REINSTALL AND SECURELY TIGHTEN COVER PLATE SCREWS COULD RESULT IN LEAKAGE OF FLUEPRODUCTSINTOTHELIVINGSPACE. VENTCOVERPLATEANDVENTSEALPLATE MUST REMAIN SECURELY INSTALLED ON UNUSED VENT COLLAR. FAILURE TO DO SO COULD RESULT IN LEAKAGE OF FLUE PRODUCTS INTO LIVING SPACE.

ON MPD-3530/4035/4540 SERIES MODELS (COMBINED TOP AND REAR VENT UNITS)

TOP VENT SEAL & COVER PLATE REMOVAL

WHEN USING THE TOP VENT

(OUTSIDE UNIT)	VENT SEAL PLATE
	GASKET
	SECURING
CABINET TOP	SCREWS

TOP VENT

FIREBOX TOP

VENT

COVER PLATECOVER PLATE SECURING SCREWS

(INSIDE UNIT)

CROSS SECTION

Figure 12

ON MPD-3530/4035/4540 SERIES MODELS (COMBINED TOP AND REAR VENT UNITS)

REAR VENT SEAL & COVER PLATE REMOVAL

WHEN USING THE REAR VENT

COVER PLATE	VENT SEAL PLATE
SECURING SCREWS	GASKET
LINTEL	SECURING
SECURING
SCREWS	SCREWS
	REAR VENT
LINTEL
	CABINET BACK
(INSIDE UNIT)	(OUTSIDE UNIT)

CROSS SECTION

Figure 13

Installation of Vent Restrictor

A vent restrictor may be needed with this appli- ance, install vent restrictor (provided) in the appliance top flue outlet as shown in Figure 14 (MPDT-3328,MPD-3530,MPD-4035 and MPD- 4540) or rear flue outlet as shown in Figure 15 (MPD-3530,MPD-4035 and MPD-4540). It is held in place by friction, only.

NOTE: DIAGRAMS & ILLUSTRATIONS NOT TO SCALE.

VENT RESTRICTOR INSTALLATION
	(TOP VENT)
A vent restrictor may be needed when
vertically terminating the vent system above
the roof (when using the appliance top vent),
install vent restrictor in the top vent of the
fireplace outlet on MPD-3530/4035/4540
and MPDT-3328 series models.
If needed, install the restrictor orientated as
shown, either from inside or outside the unit,
in the inner fireplace collar.
RESTRICTOR
INNER
FIREPLACE
COLLAR	APPLIANCE TOP
	VENT OUTLET
Figure 14

VENT RESTRICTOR INSTALLATION

(REAR VENT)

A vent restrictor may be needed when

horzontally terminating the vent system from the rear of the appliance (when using the appliance rear vent), install vent restrictor in the rear vent of the fireplace outlet on MPD-3530/4035/4540 series models, in any installation that has a vertical vent run in excess of three feet (0.914 meters).

If needed, install the restrictor orientated as shown, either from inside or outside the unit, in the inner fireplace collar.

INNER FIREPLACE	APPLIANCE REAR
COLLAR	VENT OUTLET
	RESTRICTOR

Figure 15

Select Venting System - Horizontal or Vertical

With the appliance secured in framing, deter- mine vent routing and identify the exterior termination location. The following sections describe vertical (roof) and horizontal (exte- rior wall) vent applications. Refer to the sec- tion relating to your installation. A list of approved venting components is shown in the two tables on page 27 and the two tables on page 28.