Xylem MM 231F Series 42/42S Low Water Cut-Offs/Pump Controllers - Manual

Series 42S
(Snap Switch)
Low Water Cut-Off/Pump Controller
For Steam Boilers
Typical Applications:
– Pump controller/low water fuel cut-off
for steam boilers
– Low water cut-off
• 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.
WAR NING
CAUTIO N
! WARNING
Series 42S
Series 42S-N Series 42S-A
INSTRUCTION MANUAL
or two (2) years from the date of manufacture.
MM-231F
California Proposition 65 warning! This product contains chemicals known to the •
state of California to cause cancer and birth defects or other reproductive harm.
Previous controls should never be installed on a new system. Always install new •
controls on a new boiler or system.
Failure to follow this warning could cause property damage, personal inj ury or death.
!