Bissell HS-20 instruction manual Asa

Installation

Figure 1-1. Speed and Throughput Curves – HS-20 Diffusion Pump

1-3	PHYSICAL SPECIFICATIONS (See Figure 1-2)
Flange dimensions (inches):
		ASA		ISO 630k	ISO 160k
		Inlet	Foreline	Inlet	Foreline
OD		27.50	9.0	27.17	7.09
ID		21.25	5.06	21.25	5.06
Thickness		1.12	0.75	0.78	0.47
Bolt Circle		25.0	7.5
No. of Holes		20.0	8.0	Requires NW-630	Requires NW-160
Size of Holes		1.25	0.75
				Centering Ring (not	Centering Ring (not
Orientation		Straddle center line
				included with pump)	included with pump)
Gasket Groove ID		21.625	5.31
	wide	0.48	0.375
	deep	0.25	0.09

Height	48 inches; allow additional
	8 inches (min) for heater removal

Jet Assembly 5-stage, Self-aligning, fractionat- ing design with four diffusion stages and one ejector stage

Foreline	Stacked disk and ring
Baffle
Cold Cap	Water-cooled
Water	1⁄4	FPT body and foreline
Connections	3⁄8	quick cool coils
Thermal	Upper set at 185°F (29°C)
Switches	Lower set at 390°F (93°C)

Materials	Body: Mild steel
	Flanges: Mild steel
	Jet Assembly: Aluminum
	Foreline Baffle: Stainless Steel
	Cooling Coils: Copper
	Quick Cool Coils: Stainless Steel
	Cold Cap: Copper (Nickel-plated)
Weight	500 pounds
Shipping	580 pounds
Weight

1-2