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A Air Motor with Auxiliary Switch

A Air Motor with Auxiliary Switch
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North American 1600- -A Air Motor with Auxiliary Switch Bulletin 1600-A 1600- -A Air Motors are available for control systems that require auxiliary switches on the air motor or on the valve it drives. Such switches are used, for example, to prove air valve position for high flow purge and low fire start. 1600- -A Air Motors have two SPDT limit switches mounted in a NEMA 1 general-purpose enclosure. Each switch is actuated by a pair of manually adjustable cams driven off the end of the Air Motor shaft. One cam determines the "on" position of the switch; the other determines the "off" position. SETTING PROCEDURE 1. Remove the rear access cover from the switch housing. 2. With the burner on low fire, set Cam A (Fig. 1) to actuate the outer switch, closing the normally open circuit (Leads 1 and 2). 3. As the burner proceeds to high fire, adjust Cam A to open the circuit after about 5° of travel. 4. Cams B and C must be adjusted to avoid actuating their switches as the burner approaches high fire. Cams B and C can be used for other purposes, providing an adjustable dwell for each switch. 5. When the burner reaches high fire, adjust Cam D to actuate the inner switch, closing the normally open circuit (Leads 4 and 5). This switch should be actuated about 5° before the burner reaches high fire. Leads 4 and 5 of the inner switch are used as a normally open circuit to prove high fire. When this switch is actuated, the normally open circuit closes, proving high fire. Leads 3 and 6, when used with their respective common leads, provide a normally closed circuit in each switch for other application. #1 COMMON OUTER SWITCH CAM "D" #2 NORMALLY OPEN (circuit closed when burner is at low fire) #3 NORMALLY CLOSED (circuit open when burner is at low fire) Fig. 1. Adjustable cams and limit switches on Series 1600- -A Air Motor WIRING INSTRUCTIONS Leads 1 and 2 (Fig. 2) of the outer switch are used as the normally open circuit to prove low fire. When this switch is actuated, the normally open circuit closes, proving low fire. INNER SWITCH #5 NORMALLY OPEN (circuit closed when burner is at high fire) #6 NORMALLY CLOSED (circuit open when burner is at high fire) Fig. 2. Switch Wiring Diagram SWITCH RATINGS: 10 amp with 125 or 250 V ac; ½ amp with 125 V dc; ¼ amp with 250 V dc. Switch is UL and CSA listed. SWITCH WIRE is suitable for 105 C temperature and is UL listed. Switch leads are 12" lo

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DIMENSIONS 1600- -A Air Motor. (For detail dimensions of 1600 Air motor, see Bulletin 1600.) Switch Housing Rear Access Cover Tapped hole in end of lever shaft DIMENSIONS SHOWN ARE SUBJECT TO CHANGE. PLEASE OBTAIN CERTIFIED PRINTS FROM FIVES NORTH AMERICAN COMBUSITON, INC. IF SPACE LIMITATIONS OR OTHER CONSIDERATIONS MAKE EXACT DIMENSION(S) CRITICAL. 1600- -A Switch Kit Assemblies are available for field assembly to 1600 Air Motors (built since 1972--such motors can be identified by a drilled and tapped hole in the end of the lever shaft opposite the lever (see sketch)). To Order, Specify:...

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