Nordyne RL 90+ = 12 Above Roof or Snow Accumulation Level, Vent Freezing Protection, Upflow Models

Elbow

Combustion

Air

Intake

Exhaust

Vent

1"

18" Min.

36" Max.

A

A

Exhaust

Plumbing Vent Roof Boot (Typ. Both Pipes)

A= 12” Above Roof or Snow Accumulation Level

Figure 23. Vertical Vent Termination

Vent and combustion air piping may be installed in an existing chimney which is not in use pro- vided that:

a.Both the exhaust vent and air intake run the length of the chimney.

b.The top of the chimney is sealed and weatherproofed.

c.The termination clearances shown in Figure 23 are maintained.

d.No other gas fired or fuel-burning equip- ment is vented through the chimney.

Vent Freezing Protection

When the vent pipe is exposed to temperatures

below freezing, i.e., when it passes through unheated spaces, chimneys, etc., the pipe must be insulated with 1/2 inch thick sponge rubber insulation, Armaflex-type insulation or equivalent. Insulating pipe is important to avoid condensate icing.

For extremely cold climates or for conditions of short furnace cycles (i.e. set back thermostat conditions) the last three feet of vent pipe can be reduced one nominal pipe size provided that the total vent length is at least 15 feet in length and the vent is sized in accordance with the venting requirements (Table 5) before this reduction is applied. (Example: 3” to 2-1/2” or 2” to 1-1/2”) Smaller vent pipes are less susceptible to freez- ing, but must not be excessively restrictive.

Upflow Models	Downflow Models
A	A

Collector Box

Collector Box

Left Side

Drain

8"

"HARD" J Drain Tube

Rotate counter
clockwise (Step 2)	Route to
	floor drain.
	...OR
	Route to
	condensate
Clamp	pump. Keep
	downward
(Loosen For Step 1)
	slope.
(Retighten for Step 3)

Left
Side
Drain	Rotate clockwise
	(Step 2)
8"
"HARD" J	Clamp
	(Loosen For Step 1)
Drain Tube
	(Retighten for Step 3)

Route to floor drain.

...OR Route to condensate pump. Keep downward slope.

Figure 24. Furnace with Condensate Drain Trap Assembly

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