Filter Door Assembly

FILTER DO0_ _

PIN _T_ TAB

FILTER DOOR I I I _'l]l

FILTER

FIGURE 6

4 - Positionfilter door on end offilter so that the thumb tab side of the filter door is away from the furnace. Squeeze thumb tabs to secure filter to door.

5 - Guide filter and filter door into the filter rack installed on side of furnace. Push door into filter rack until se- cure.

6 - To remove filter, pull filterdoor pins untildoor is re- leased from filter rack,

Use industry-approved standards to size and install the supply and return air duct system. This will result in a quiet and low-static system that has uniform air distribution.

Supply Air Plenum

Furnaces installedwithout a cooling coilrequirethe installa- tion of a removable access panel inthe supplyair ducL The access panel should be large enough to permit inspection (either by smoke or reflected light) of the heat exchanger for leaks after installation. The furnace access panel must al- ways be in placewhen the furnace is operating and it must not allow leaks into the supply air duct system.

Return Air Plenum

See dimensionillustrationon page 2 for proper return air duct size.

NOTE - For bottomreturn air, returnair ductshouldbe se- cured to the unit using rivets or Sqocks. For side return air, secure return air duct to filterrack usingscrews. When using screws, take care to avoid interference with the fil- ter which may cause improper filtration.

The return air must not be drawn from a room where

another gas appliance (ie,, a water heater) is

installed. Even thoughthisfurnace draws its combustion air from outside of the structure, other gas appliances that share a utility room may not. When retum air is drawn from a room, a negative pressure is created in the room. If

a gas appliance is operating in a room with negative pres- sure, the flue products can be pulled back down the vent pipe and into the room. This reverse flow of the flue gas may result in incomplete combustion and the formation of carbon monoxide gas. This toxic gas might then be dis- tributed through the house by the furnace duct system.

J Pipe & _tttings S _¢ifi_ti_ :::% :::::: :::::::::: ::: : ::

]

All pipe,fittings,primerand solventcementmust conform with American NationalStandard Instituteand the Ameri-

can Society for Testingand Materials (ANSI/ASTM) stan- dards. The solvent shall be free flowing and contain no lumps, undissolved particles or any foreign matter that adversely affects the joint strength or chemical resistance of the cement. The cement shall show no gelation, stratifi- cation, or separation that cannot be removed by stining. Refer to table 2 for approved piping and fitting materials.

TABLE 2

PIPING AND FITTINGS SPECIFICATIONS

		ASTM
PIPE & FITrlNG MATERIAL		SPECIFICATION
Schedule 40	PVC (Pipe)	D1785
Schedule 40	PVC (Cellular Core Pipe)	F89t
Schedule 40	PVC (Fittings)	D2466
Schedule 40	CPVC (Pipe)	F441
Schedule 40	CPVC (Fittings)	F438
SDR-21 PVC (Pipe) or SDR-26 PVC (Pipe)		D2241
SDR-21 CPVC (Pipe) or SDR-26 CPVC (Pipe)		F442
Schedule 40	ABS (Pipe)	D1527
Schedule 40	ABS (Fittings)	D2468
ABS-DWV (Drain Waste & Vent)
(Pipe & Fittings)		D2661
PVC-DWV (Drain Waste & Vent -		D2665
Pipe & Fittings)

ACAUTION

Primers and solvents must meet ASTM specifications, PVC pdrnerisspecifiedin ASTM F 656. Use PVC solvent cement as specified in ASTM D 2564 and ABS solvent cement as specified in ASTM D 2235. Low temperature solvent cement is recommended. Metal or plastic strap- ping may be used for vent pipe hangers.

Table 3 lists the available exhaust termination kits. All Lennox vent terminations are PVC.

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