Roberts Gorden CTHN-60, CTHN-200, CTHN-100 Unitary U-tubeHeater Layouts, U-tubeAssembly Overview

SECTION 8: UNITARY LINEAR & U-TUBE HEATER INSTALLATION

8.4 Unitary U-tube Heater Layouts

CTHN-Series heaters (except CTHN-40) are approved for optional u-tube configurations.

The u-tube may be installed in either a standard horizontal position, 45° position or in an opposite 45° position as shown on Page 5, Figure 5 through Figure 7. When using a u-tube configuration, the following additional rules must be adhered to:

FIGURE 16: U-tube Assembly Overview

•A minimum of 10' (3 m) on CTHN-60/80, a minimum of 15' (4.5 m) on CTHN-100/125, and a minimum of 20' (6 m) on CTHN-150/175/200 is required between the burner and the u-tube.

•For turbulator installation, See Page 21, Step 8.8.

•The burner must never be operated in a tilted position.

The heater must be properly supported at all locations. See Page 10, Figure 12.

U-tube

Support Bracket

Reflector

Support

Burner

Turbulator

(With Select

Reflector

Tube Clamp

Package

U-tube, Standard

Burner

Tube

Models) Tube

12

U-tube, Full 45°

2

1

U-tube, Opposite 45°

12

		Couplings
1	Tight U-bolt	Loose U-bolt
	4" (10 cm) u-bolt,	2 4" (10 cm) u-bolt,
secured to burner tube		secured to bracket with
	with 1/4" (6 mm)	1/4" (6 mm) lockwashers
	lockwashers and	and 1/4-20 hex nuts on
	1/4-20 hex nuts.	top and bottom to
		allow for tube expansion
		and contraction.
		U-bolt
		Nut
		Lock Washer
		Lock Washer
		Nut

U-clips

Reflector

End Caps

U-tube

18" (457 mm)

Center to Center

17