set POINt RANGe & ADjUstmeNt Calibration requires a manometer (not included in the kit) as well as the included 7/32" hex wrench. 1. Establish the set point as follows. Refer- ring to table 2 in this manual, select the appropriate spring for the required set point range. Insert the spring into the center well of the mounting pan (light gray side of the switch housing). 2.Insert the black set point adjustment screw, and rotate it manually until the threads are engaged. 3. Connect the switch to a manometer. Us- ing the 7/32" hex wrench provided in the kit, turn the adjustment screw in small incre- ments until the desired set point is reached. Turn the screw clockwise to increase the set point or counterclockwise to decrease the set point. For precise calibration, confirm the set point at actual operating temperature with a manometer. Following precise cali- bration, if desired, seal the adjusting screw using Three Bond #TB3015B UV curable adhesive/sealant. Do not place the switch in operation without knowing what the set point is: doing so could create a hazardous situation.

• ❖ FOR ResIDeNtIAL & LIGHt COmmeRCIAL HVAC APPLICAtIONs ❖ Compatible with Honeywell and fits various models for IS22010051FS5052 and more. Approvals: UL, CUL, CSA, CE, Australian Gas Assoc. Product Life: 100,000 cycles. Operating Temperature: -40°F to 190°F (-40°C to 88°C). Operating Range:0.10"w.c to 10.0"w.c
• ❖GeNeRAL DesCRIPtION & OPeRAtION The NS2TM Switch has a glass-filled poly- carbonate housing containing a sensing dia- phragm and an integral snap-acting switch with three male 90° quick-connect terminals. The switch can be actuated by a pressure or vacuum air flow or the differential between two air flows. The field adjustable set point range of the switch is 0.10"w.c. to 10.0"w.c. Using the switch accessories contained in this kit,
• the NS2TM switch can be applied to a wide variety of residential and light com- mercial HVAC applications.
• mOUNtING Using the (2) #6-3/8 mounting screws in- cluded in the kit, mount via the integral foot bracket (see Fig. 1) or, via either of the op- tional brackets (see Figs 4 & 5) included in the kit. If using one of the optional brackets, attach it to the switch with the self tapping screw provided before mounting the switch. Select a mounting location free from vibra- tion. Mount with the diaphragm in any verti- cal plane. Avoid mounting with the sample line connections directed upward.
• ❖ eLeCtRICAL CONNeCtIONs The snap switch has three 1⁄4" 90° male quick connect terminals. Before pressure is applied to the diaphragm, the switch contacts are in the deactivated position as shown in Figure 2.