Roberts Gorden CGTH-30, CGTH-50, CGTH-40 service manual Horizontal Installation Top View

CGTH INSTALLATION, OPERATION AND SERVICE MANUAL

surface of the burner. Note this dimension here

________.

2.Using the tape measure, transfer this measure- ment to the inside surface of the exterior wall that the vent will penetrate; make a reference mark. Check the location of the hole to ensure that there are no internal wall structures (i.e. studs) to pre- vent penetration. Also check that the outlet of the vent does not compromise the general venting requirements, See Section 5.1.

3.Using a tape measure, measure distances ‘A’, ‘B’, ‘C’ and ‘D’ as shown in Figure 18. Note these dimensions here (A= ______, B= ______, C=______, D=______) and add them together.

NOTE: If the total of dimensions above are greater than 5' (1524 mm), a 5’ (1524 mm) balanced flue vent extension kit (P/N 08039000) will be required.

FIGURE 18: Horizontal Installation Top View

		- Top View -
Optional Vent
Extension	D	C		3" (80 mm)
			B
Vent				5" (125 mm)
Terminal
				A
		6" (152 mm)
3" (80 mm)		Minimum
pipe is slid
through end
of terminal
			Heater

4.From the reference mark made in step 2, measure down vertically 1/4" (6 mm) per foot measured in step 3. Cut 5” (125 mm) vent terminal clearance hole at the lower reference.

5.Cut the 3” (80 mm) vent to length as follows: Length A

3” diameter = A – 8”

Length B

3” diameter = B + C + D – 7 3/4”

Always cut a non-swaged end.

6.Wrap the 1" (2.5 cm) diameter spring around the outside diameter of the 3" (80 mm) elbow as shown in Figure 19.

FIGURE 19: Elbow Assembly End View

Interlock Loops

as shown

1" (25 mm)

Diameter Spring

3" (80 mm)

Elbow

7.Interlock the loops at each end of the spring coils together as shown in Figure 19. The loops will lock together to produce a continuous coil spring spacer around the outside diameter of the 3" (80 mm) elbow.

8.Fit the 5" (125 mm) elbow over the 3" (80 mm) elbow (Figure 20).

FIGURE 20: Elbow Assembly Cross Section View

5" (125 mm)

Diameter Elbow1" (25 mm) Diameter Spring

6" (152 mm)

	3" (80 mm)
2.75" (57 mm)	Diameter Elbow

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