Tjernlund 950-0452 PAI-1,2 Prover Kit 8504044 Rev. 1 04/97 - Manual (Page 2)

1. Disconnect electrical power before making wiring connections to prevent electrical shock and equipment damage.
2. All wiring must comply with applicable codes and ordinances.
3. When wiring is completed, check all components by running system through its entire heating cycle.
IN-FORCERS with date codes after “9704”
For the steps following below, refer to diagram B.
1. Remove (6) screws from bottom front and sides of IN-FORCER while holding blower assembly firmly.
2. Carefully slide blower assembly down until stops, hold it in place.
3. Carefully remove BLUE & YELLOW leads from Proving Switch. Loosen and remove (2) self-tapping screws that hold
Proving Switch bracket to blower housing.
4. Remove new Proving Switch from box which has 2 holes in bracket and reinstall PAI Proving Switch to fan housing
using (2) self-tapping screws provided. Firmly tighten switch bracket onto housing. Bend of actuating wire should be
pointed away from damper as shown.
5. Push female leads on new Proving Switch. The BLUE wire from IN-FORCER junction box should be connected to the
COM terminal of Proving Switch and the YELLOW wire should be connected to N/O terminal of Proving Switch.
6. Before reassembling IN-FORCER, check Proving Switch for free movement. Proper operation of Proving Switch can
be verified by a “click” sound as switch opens and closes.
7. Follow reverse procedure in steps 1 & 2 to reassemble IN-FORCER. Verify proper heater and IN-FORCER operation.
DIAGRAM B
P/N: 8504044 ©1997 TJERNLUND PRODUCTS, INC. ALL RIGHTS RESERVED REV. 1 4/97