Install Instructions

ManualsBrandsMcdonnell & Miller ManualsHeating Supplies150S-M, Float Type, Combo LWCO & Pump Controller, w/ Manual Reset (Steam)

Series 150, 150S, 157, 157S

Bellows Replacement

Series 150

Series 150S

• Before using product, read and understand instructions.

• Save these instructions for future reference.

• All work must be performed by qualified personnel trained in the proper application,

installation, and maintenance of plumbing, steam, and electrical equipment and/or systems

in accordance with all applicable codes and ordinances.

• To prevent electrical shock, turn off the electrical power before making electrical

connections.

• To prevent serious burns release all pressure and let boiler cool down to 80˚F (27˚C).

• Drain water level down below the float bowl chamber before taking the head mechanism

out of the body.

Failure to follow this warning could cause property damage, personal injury or death.

WARNING

McDonnell & Miller

Installation & Maintenance

Instructions

MM-711(A)

Summary of content (4 pages)

PAGE 1
McDonnell & Miller Series 150, 150S, 157, 157S Bellows Replacement Installation & Maintenance Instructions MM-711(A) Series 150 Series 150S ! WARNING CAU WARNI NG TION • Before using product, read and understand instructions. • Save these instructions for future reference.
PAGE 2
STEP 1 - Preparation a. To prevent electrical shock turn off all electrical power to the boiler. CAUTION: There may be more than one source of power to the boiler. ON OFF b. Release all pressure from the boiler and let it cool down to 80˚F (27˚C). Drain the water level down below the float chamber. c. Remove the four screws that hold the cover on the switch housing (A) and remove the cover. Mark all electrical supply wires so they can be returned to the proper terminals.
PAGE 3
STEP 2 - Changing the Bellows for Mercury Switch Units (For Snap Switch See STEP 3) a. NOTE: On units that have Allen® head screws they should be replaced with Torx® screws (furnished). D b. Take the new bellow assembly (F) and disassemble it noting the order of the parts. Put sealing washer (J) on top of float arm (K) and insert into inside of bellows (F). Place gasket (L) over bellows (F). Insert this assembly into switch housing (A) and bracket (H).
PAGE 4
McDonnell & Miller Step 3 - Changing the Bellows for Snap Switch Units cont’d) b. NOTE: On units that have Allen® head screws they will be replaced with Torx® screws (furnished). c. Take the new bellows assembly (F) and disassemble it noting the order of parts. Put sealing washer (J) on top of float arm (K) and insert into inside of bellows (F). Place gasket (L) over bellows (F). Insert this assembly into switch housing (A) and bracket (H).