Submittal

Submittal Data Information
Probe Style Low Water Cut-Off-Residential Steam
JOB_____________ ENGINEER_____________________CONTRACTOR______________________
Effective: January 1, 2007
Item Number
Model Number
NOTES
SF-400
Supercedes: NEW
Low Maintenance-No moving parts
to wear or hang up,as in float devices.
400 Series - Non-Cycling
Dimensions
83 Water Street, New Haven, CT 06511
www.hydrolevel.com
Phone: [phone]
Fax: [phone]
email address: [e-mail]
Visit our website at:
Printed in the U.S.A.
Copyright 2007 - Hydrolevel Company
SF400-4/07
Advanced Solid State Design-High
quality, economical boiler protection.
Probe Plus 30-Thirty second on-
time delay allows solenoid valves
and automatic feeders to bring feed
water past the probe to a safe
operating level.
Delayed Burner Shutdown-15
second off-time delay in low water
condition prevents burner short
cycling due to surging and priming.
Automatic Reset-Automatically
restarts the boiler after 30 second
on-time delay when water reaches
the probe.
Standard Application
Operation
Safgard 400 Series Low Water Cut-Offs are used as the primary low water cut-off on
residential and light commercial steam heating boilers. They are also used in low pressure
steam process applications.
Hydrolevel controls utilize a non-moving, heavy duty, electronic probe to sense liquid levels.
The probe can be installed in an equalizing line or directly into a boiler or water tank. When
water is in contact with the probe, it completes a circuit between the stainless steel probe
tip and the tank or boiler surface in which the probe is installed. When the water level drops
below the probe, the circuit opens.
Hydrolevel low water cut-offs for steam heating systems use the water signal to allow the
burner to operate. If the water level drops below the probe, the circuit opens and the cut-
off shuts down the burner. Hydrolevel primary controls for steam boilers utilize both on-
time and off-time delays to prevent boiler short-cycling and to facilitate proper automatic
boiler water feeding.
FEATURES
SAFGARD SERIES 400
SPECIFICATIONS
Input Voltage...................24VAC/60HZ
or 120VAC/60HZ
Max. Steam Boiler Pressure.......15 psi
Agency Listing...............U.L. - 488S
Switch Contacts..............SPDT
Alarm Circuit..50VA@24VAC-Pilot Duty
or 125VA@120VAC-Pilot Duty
Switch Contact Ratings......5.8 FLA
34.8 LRA
Control Power Consumption.....3.6 VA
Control Housing......................NEMA1
MATERIALS OF CONSTRUCTION
Control Housing.......Galvanized Steel
Probe Insulator...........Glazed Ceramic
Probe Tip....................316 Stainless Steel
1
5
/ 8
1
5
/ 8
1
1
/ 8
2
3
/ 8
1
5
/ 8
TOP
2
25
/32
3
7
/ 8
1
1
/ 8
2
3
/ 8
BOTTOM
5
9
/16
5
1
/2
1.00
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