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Summary of Contents for Xylem McDonnell & Miller 150S Series
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Page 2: Operation
OPERATION Maximum Pressure: 150 psi (10.5 kg/cm Electrical Ratings Alarm Circuit Rating Motor Horsepower Pump Circuit Rating (Amperes) Voltage Amps Voltage Voltage Full Load Locked Rotor Pilot Duty 120 VAC 120 VAC 120 VAC 44.4 345 VA at 120 or 240 VAC 240 VAC 22.2 240 VAC... - Page 3 Settings and Differential Pressures (continued) Values are ± 8" (3.2mm). Model 158S Model 158S-MD Approximate Approximate Distance Above Distance Above Cast Line Differential Cast Line Differential Setting In. (mm) In. (mm) Pressure Pressure Setting In. (mm) In. (mm) Motorized (24) Pump Off (24) 0 psi...
- Page 4 Settings and Differential Pressures (continued) Values are ± 8" (3.2mm). Model 159S Approximate Distance Above Cast Line Differential Setting In. (mm) In. (mm) Pressure Pump #1 Off (24) 0 psi Pump #1 On (16) (0 kg/ Pump #2 Off (16) (16) Pump #2 On (6.4)
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Page 5: Installation
INSTALLATION TOOLS NEEDED: One (1) pipe wrench, one (1) flathead screwdriver, one (1) scraper, and one (1) 9/16" socket or wrench. STEP 1 - Preparation WARNING • To prevent serious burns, the boiler must be cooled to 80˚F (27˚C) and the pressure must be 0 psi (0 bar) before servicing. - Page 6 STEP 2 - Installing the Replacement Head Mechanism a. Carefully remove the new replacement head mechanism from the carton. Handle it carefully to prevent damage to the float rod (G). b. Align the bolt holes of the new head gasket (J) on the sealing surface of the control body.
- Page 7 STEP 3 - Electrical Wiring WARNING • To prevent a fire, do not use this product to switch currents over 7.4A, 1/3 Hp at 120 VAC or 3.7A, 1/3 Hp at 240 VAC, unless a starter or relay is used in conjunction with it. •...
- Page 8 Switch Operation For all Models except 158S and 159S Boiler feed pump off, Boiler feed pump on, Boiler feed pump on, burner on, alarm off. burner on, alarm off. burner off, alarm on. For Model 158S Motorized valve closed, Motorized valve open, Motorized valve open, burner on, alarm off.
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Page 9: Wiring Diagrams
WIRING DIAGRAMS For Motorized Valves, refer to the valve manufacturer's wiring instructions. Low Water Cut-Off Only 1. Main Line Switch - For burner circuits within the 2. Pilot Switch - To holding coil of a starter when switch’s electrical rating. the burner circuit exceeds the switch’s electrical rating. -
Page 10: Installation Complete
STEP 4 - Testing This control is factory calibrated for specific level The following testing procedure is only meant to settings as shown on pages 2-4 in the “Operation” serve as a verification of proper operating section. sequence. IMPORTANT: Follow the boiler manufacturer’s start-up and operating instructions along with all applica- ble codes and ordinances. -
Page 11: Maintenance
MAINTENANCE BLOW DOWN PROCEDURE: SCHEDULE: CAUTION Blow down control as follows when boiler is To prevent serious personal injury from steam in operation. pipe blow down, connect a drain pipe to the • Daily if operating pressure is above 15 psi. control opening to avoid exposure to steam discharge. - Page 12 Xylem Inc. 8200 N. Austin Avenue Morton Grove, Illinois 60053 Phone: (847) 966-3700 Fax: (847) 965-8379 www.xylem.com/mcdonnellmiller McDonnell & Miller is a trademark of Xylem Inc. or one of its subsidiaries. © 2019 Xylem Inc. MM-219M May 2019 Part No. 210343...
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