MODELS 250/250WC
Pump Control
Low Water Cut-Off
Combination
Operating Voltage ................. 120VAC
Max. Steam Pressure ............ 250PSI
Burner Relay ............. 10 FLA, 60 LRA
Pump Relay ................ 10 FLA, 60LRA
Alarm Relay ................ 10FLA, 60LRA
Power Consumption ................ 13 VA
The series 250 control requires regular maintenance for safe operation. Before installing
please read and understand the maintenance procedures listed on page 7 of this manual as
well as any required maintenance procedures listed in your boiler manufacturer’s instructions.
Electrical shock hazard.
To prevent electrical shock, death or equipment damage, disconnect power supply before installing
or servicing control. Only qualified personnel may install or service this control in accordance with local codes and ordinances.
Read instructions completely before proceeding.
Frozen pipes/water damage.
Central heating systems are prone to shut down as a result of power or fuel outages, safety
related fault conditions or equipment failure. Installation of freeze protection monitoring or other precautions is recommended for
unattended dwellings in climates subject to sustain below-freezing temperatures.
Disconnect power supply before beginning installation to prevent electrical shock or equipment damage.
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.
To prevent serious personal injury from steam and hot water make sure there is a discharge line from the blow-down valve to a
proper place of disposal.
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.
Always install a new control on a new boiler system. Never use a control that has already been used on a previous appliance.
Failure to follow this warning could cause property damage, personal injury or death.
1
Read and understand these instructions completely before installing or servicing this control. Save these instructions for
future reference.
Only qualified personnel may install or service the control in accordance with local codes and ordinances.
Secondary (redundant) Low Water Cut-Off controls must be installed on all steam commercial boilers. At least two con-
trols must be connected in series with the burner control circuit to provide redundant protection in the event the boiler
experiences a low water condition.
NOTICE
PLEASE READ BELOW BEFORE INSTALLING
• No moving parts to stick, wear or hang-up
• No replacement or rebuilding of floats or mechanical parts
• Reliable electronic design
• Made in the USA.
MODEL 250
MODEL 250WC
WARNING