Napoleon Fireplaces GDS60N manual Installation Preparation Model GDS60, Orifice Replacement

Example 8:
V1		= 1.5 FT
V2		= 5 FT
V	T	= V	1	+ V = 1.5 + 1 + 5 = 6.5 FT
				2
H1		= 1 FT
H2		= 1 FT
H3		= 10.75 FT
HR		= H1		+ H2	+ H3 = 1 + 1 + 10.75 = 12.75 FT	90°
HO		= .03 (four 90° elbows + one 45° elbow - 90°)
		= .03 (360° + 45° - 90°) = 6.75 FT				H2
HT		= HR		+ HO	= 12.75 + 6.75 = 19.5 FT	45°
HT		+ VT		= 19.5 + 6.5 = 26 FT
Formula 1:						V1
H		< 3 V
	T	3 VTT = 3 x 6.5 = 19.5 FT				H1
19.5 = 19.5						90°

Formula 2:	FIGURE 3.11e
HT + VT < 40 FT
26 < 40

Since both formulas are met, this vent configuration is acceptable.

23

V2

H3 90°

18.2_3

4.0 INSTALLATION PREPARATION - MODEL GDS60

4.1 ORIFICE REPLACEMENT

REAR VENT TERMINATION:

In rear exit installations with no vertical vent run, the BTU input must be reduced to 21,000 BTU by changing the orifice.

In order to access the orifice, the log support secured by two screws, must be removed.

Care should be taken not to damage the gas pipe. When removing	FIGURE 4.1a
the orifice, using a 9/16" socket wrench, a 7/8" back-up wrench must
be used on the manifold, located below the housing, to ensure that
the aluminum tubing does not twist or kink.

FIGURE 4.1b

W415-0788 / A / 09.22.09