ITT McDonnell & Miller 64 Series Installation & Maintenance Instructions Manual

Series 64
Low Water Cut-Off
Typical Applications:
- Primary or secondary low water cut-off
for hot water and steam boilers.
- Low water cut-off
- High water cut-off
- Alarm actuator
OPERATION
Maximum Boiler Pressure: 50 psi (3.5 kg/cm
Electrical Ratings
Motor Switch Rating (Amperes)
Voltage Full Load
120 VAC 7.2
240 VAC 3.6
NOTE: 11MV is rated 24VA @ 24VAC to 120VAC.
• Before using this product read and understand instructions.
• Save these instructions for future reference.
• All work must be performed by qualified personnel trained in the proper application, instal-
lation, and maintenance of plumbing, steam, and electrical equipment and/or systems in
accordance with all applicable codes and ordinances.
• 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.
• To prevent electrical shock, turn off the electrical power before making electrical connections.
• This low water cut-off must be installed in series with all other limit and operating controls
installed on the boiler. After installation, check for proper operation of all of the limit and
operating controls, before leaving the site.
• We recommend that secondary (redundant) Low Water Cut-Off controls be installed on all
steam boilers with heat input greater than 400,000 BTU/hour or operating above 15 psi of
steam pressure. At least two controls should be connected in series with the burner control
circuit to provide safety redundancy protection should the boiler experience a low water
condition. Moreover, at each annual outage, the low water cut-offs should be dismantled,
inspected, cleaned, and checked for proper calibration and performance.
• To prevent serious personal injury from steam blow down, connect a drain pipe to the control
opening to avoid exposure to steam discharge.
• To prevent a fire, do not use this low water cut-off 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.
Failure to follow this warning could cause property damage, personal injury or death.
®
Locked Rotor Pilot Duty
43.2
120 VA at
120 or 240 VAC
21.6
CUT-OFF
LEVEL
Model 64
2
)
CUT-OFF
LEVEL
Model 64-CB
WARNING
McDonnell & Miller
Installation & Maintenance
Instructions
MM-200(E)
CUT-OFF
LEVEL
Model 64-A
Model 764