Specifications

d. Regulator Adiustment.
1. Remove positioner from service. Disconnect
electrical power from I/p converter.
2. Using adjusting knob on top of regulator,
adjust pressure until pressure gauge on
regulator reads 20 to 22 psi.
3. Connect electrical power to IIF converter.
4. Return power positioner to service
8-4. LIMIT SWITCH.
a. Adiustment.
engages upper limit switch (4), secure. cam
assembly (2) against shaft (3) with screws
(1).
5. Loosen screws (5) securing lower limit
switch cam assembly (6) to shaft (3).
6. Use manual operator wheel to position
linkage lever to lower lit stopping
position.
7. Rotate lower limit switch cam assembly (6)
in counterclockwise direction when viewed
from left of positioner. When cam shoe
engages lower limit switch (7), secure cam
assembly (6) to shaft (3) with screws (5).
1. Remove power positioner from service, close
supply air shutoff valve, and isolate
electrical power from power positioner.
Move transfer valve to manual position.
2. Loosen screws (1, Figure X-2) securing
upper limit switch cam assembly (2) to shaft
(3).
3. Use manual operator wheel to position
linkage lever to desired upper lit stopping
position.
4. Rotate upper limit switch can in
counterclockwise direction when viewed
from left of positioner. When cam shoe
b. Replacement.
1. Remove power positioner from service.
2. Close supply air shutoff valve. Disconnect
electrical power from positioner.
3. Disconnect limit switch wires from terminals
1 through 8 on buses 2 and 3 in junction
box.
4. Remove nuts (9, Figure 8-2) from studs (8)
and remove studs.
5. Remove lower limit switch (7) and upper
limit switch (4) from bracket.
6. Install new switches on bracket with studs
(8) and nuts (9).
7. Route wires “long same. path as old limit
switches, Connect wires from new switches
to terminal buses 2 and 3 according to
Figure 8-2.
8. Restore electrical power to positioner. Open
supply air shutoff valve.
9. Refer to Section 8-4.a and adjust limit
switches. Return power positioner to service.
B-102-208
8-2