Lennox Hearth MPD35ST-NE, MPD35ST-NM, MPD35ST-PM manual Congratulations

CONGRATULATIONS!

In selecting this LENNOX Direct-Vent Gas Appliance you have chosen the finest and most dependable fireplace to be found anywhere. Its a beautiful, prestigious alternative to a wood burning fireplace. Welcome to a Family of tens of thousands of satisfied LENNOX Fireplace Owners.

Please carefully read and follow all of the instructions found in this manual. Please pay special attention to the safety instructions provided in this manual. The Homeowner's Care and Operation Instructions included here will assure that you have many years of dependable and enjoyable service from your LENNOX product.

Theseappliancesaredesignedtooperateonnatural gas or propane gas only. The use of other fuels or combination of fuels will degrade the performance of this system and may be dangerous.

Millivolt Models - BTU Input

Millivolt models come standard with the manu- ally-modulated gas valve; flame appearance and heat output can be controlled at the gas valve. The BTU Input for millivolt models is shown in Table 1:

2

TABLE OF CONTENTS
Introduction	Page	2
General Information	Page	2
Gas Controls Access	Page	4
Operation / Care of Your Appliance ...	Page	4
Variable Flame Adjustment	Page	5
Maintenance	Page	5
Front Glass Enclosure Panel,
Removal and Installation	Page	6
Install Grate, Vermiculite
Embers & Logs	Page	7
Burner Flame Appearance & Sooting Page		9
Burner Flame Adjustments	Page	9
Millivolt Appliance Checkout	Page	10
Electronic Appliance Checkout	Page	10
Wiring Diagrams	Page 11
Warranty	Page 11
Product Reference Information	Page	11
Accessory Components	Page 12
Lighting Instructions – Millivolt	Page	15
Lighting Instructions – Electronic	Page	16
Maintenance Schedule	Page 17
Troubleshooting Guide – Millivolt	Page	18
Troubleshooting Guide – Electronic ..	Page	18
Replacement Parts List	Page	20

INTRODUCTION

The Fireplace models covered in this manual are Direct-Vent sealed combustion gas fireplace heaters designed for residential application. Direct-Vent appliances operate with the com- bustion chamber completely isolated from the indoor environment. All air for combustion is brought in from the outside and exhaust gases are vented through the same direct vent, co-axial (intake/exhaust) vent system.

The Millivolt appliances have a millivolt gas control valve with piezo ignition system provides safe, efficient operation. If any optional acces- sories which require electrical power are being installed, the electrical power must be provided at the time of appliance installation.

The Electronic appliances have an electronic intermittent pilot system provides safe, efficient operation. External electrical power is required to operate these appliances.

These appliances comply with National Safety Standards and are tested and listed by OMNI- Test Laboratories, Inc. (Report No.116-F-28-5) to ANSI Z21.88a-2003 (in Canada, CSA-2.33a- 2003), and CAN/CGA-2.17-M91 in both USA and Canada, as vented gas fireplace heaters.

The Installation must conform to local codes or, in the absence of local codes, with the National Fuel Gas Code, ANSI Z223.1/NFPA 54-latest edition, or the Natural Gas and Propane Installation Code, CSA B149.1-latest edition. The appliance, when installed, must be electrically grounded in accordance with local codes or, in the absence of local codes, the latest edition of the National Electrical Code, ANSI/NFPA 70, or the Canadian Electrical Code, CSA C22.1 - latest editions.

GENERAL INFORMATION

Note: Installation and repair should be per- formed by a qualified service person. The appliance should be inspected annually by a qualified professional service technician. More frequent inspections and cleanings may be required due to excessive lint from carpeting, bedding material, etc.

IMPORTANT

It is imperative that the control compartment, burners and circu- lating air passage ways of appli- ance be kept clean. See Mainte- nance instructions on Page 5.

Provide adequate clearances around air open- ings and adequate accessibility clearance for service and proper operation. Never obstruct the front openings of the appliance.

Due to high temperatures the appliance should be located out of traffic and away from furniture and draperies. Locate furniture and window coverings accordingly.

These fireplaces are designed as supplemen- tal heaters. Therefore, it is advisable to have an alternate heat source when installed in a dwelling.

NOTE: DIAGRAMS & ILLUSTRATIONS NOT TO SCALE.

Input (BTU) Manually-Modulated Gas Valves (millivolt models)

Models	Fuel	Input Rate
	Type	(BTU / HR)
MPD35ST-NM	Nat. Gas	30,000 high
		23,000 low
MPD35ST-PM	Propane	28,000 high
		22,000 low

Table 1

Electronic Models -

Electronic models have a fixed rate gas valve. The BTU Input for electronic models is shown in Table 2:

Input (BTU) - Fixed Rate

(electronic models)

Models	Fuel	Input Rate
	Type	(BTU / HR)
MPD35ST-NE	Nat. Gas	30,000
MPD35ST-PE	Pro. Gas	28,000
(if field converted)

Table 2

Gas Pressure -

Tables 3, 4 and 5 show the appliances' gas pressure requirements.

Inlet Gas Supply Pressure

(all models)

Fuel #			Minimum	Maximum
Natural Gas			5.0" WC	10.5" WC
			(1.24 kPa)	(2.61 kPa)
Propane			11.0" WC	13.0" WC
			(2.74 kPa)	(3.23 kPa)
Table 3
Manifold Gas Supply Pressure
		(millivolt models)
Fuel #			Low	High
Natural		(Lo) 2.2" WC		(Hi) 3.5" WC
Gas			(.55 kPa)	(.87 kPa)
Propane	(Lo) 6.3" WC			(Hi) 10.0" WC
		(1.57 kPa)		(2.49 kPa)

Table 4