Pneumatic Control Manual 717.1 Repair Parts for Discontinued Products Section Instruction Bulletin T-460-B Issue Date 06B1 T-460 Dual Room Thermostat Control Pressure: The relay should be adjusted in accordance with Instruction Bulletin R-351A. If the control pressure from the thermostat does not build up to equal the supply pressure when the control port is closed, the lid alignment tools should be used to align the lid with the control port. 4. Turn pointers to the side and lift guide and night strip forward as far as possible. 5. Remove the two screws holding the plate and then remove plate. 6. Remove damaged bellows. Replacing the Indexing Bellows Reassembling Instructions Disassembling Instructions 1. Screw in new bellows and tighten. 1. Remove thermostat from pipehead. 2. Replace plate, Fig. 1. 2. Remove dial, control port lid, and indexing springs. 3. Adjust stop screw so the plate rests on stop screw with cam in position shown in Fig. 1. 3. Release spring holding the guide and night strip. 4. Turn center saucer plate screw until plate begins to rise from stop screw. Turn saucer plate screw back 1/2 turn. 5. Replace indexing springs. © Johnson Controls, Inc. Code No. LIT-7171705X 1 Adjustment of Indexing Springs With the thermostat mounted in the wall and low supply pressure for day control the springs should be adjusted so the cam is positioned to hold the night strip away from the control port lid. The spring adjusting screws should stick out beyond the upper part of the arm approximately 1/32 in. as shown in Fig. 1. Switching the supply pressure to the high Controls Group 507 E. Michigan Street P.O. Box 423 Milwaukee, WI 53202 2 T-460 Instruction Bulletin side night control the cam should rotate enough to allow the night strip to operate the control port lid without interference from the cam. Pushbutton Control Adjustment The pushbutton screws shown in Fig. 2 should be turned in or out to properly match the button on the thermostat cover. Printed in U.S.A.