Lennox International Inc ML193UH installation instructions Table of Contents, 2P0813, P507121-01

E 2013 Lennox Industries Inc.

Dallas, Texas, USA

	AIR FLOW
	UPFLOW
AIR FLOW	AIR FLOW
HORIZONTAL LEFT	HORIZONTAL RIGHT

INSTALLATION

INSTRUCTIONS

ML193UH

MERIT® SERIES GAS FURNACE

UPFLOW / HORIZONTAL AIR DISCHARGE

507121-01

08/2013Litho U.S.A. Supersedes 06/2013

THIS MANUAL MUST BE LEFT WITH THE HOMEOWNER FOR FUTURE REFERENCE

This is a safety alert symbol and should never be ignored. When you see this symbol on labels or in manuals, be alert to the potential for personal injury or death.

CAUTION

As with any mechanical equipment, personal injury can result from contact with sharp sheet metal edges. Be careful when you handle this equipment.

WARNING

Improper installation, adjustment, alteration, service or maintenance can cause property damage, person­ al injury or loss of life. Installation and service must be performed by a licensed professional HVAC in­ staller (or equivalent), service agency or the gas sup­ plier.

Table of Contents

Unit Dimensions	2	Vent Piping Guidelines	17
ML193UH Gas Furnace	3	Gas Piping	34
Shipping and Packing List	3	Electrical	37
		Integrated Control	39
Safety Information	3
		Unit Start Up	40
Use of Furnace as a Construction Heater	4
		Gas Pressure Measurement	41
General	5
		Proper Combustion	42
Combustion, Dilution, Ventilation Air . . . .	5
		High Altitude	42
Setting Equipment	8	Testing For Combustion Air Non-Direct Vents	44
Filters	13	Other Unit Adjustments	45
Duct System	13	Twinning the ML193UH	45
Pipe and Fittings Specifications	13	Service	46
Joint Cementing Procedure	15	Repair Parts List	47
Venting Practices	16	Start Up Checklist	48

08/13		507121-01
*2P0813*	Page 1	*P507121-01*