Submittal

Dimensions
Input Voltage...................24VAC/60HZ
or 120VAC/60HZ
Maximum Pressure.......250 psi
Agency Listing.....................U.L. & CSA
Switch Contacts.............SPDT
Alarm Circuit..50VA@24VAC-Pilot Duty
or 125VA@120VAC-Pilot Duty
Switch Contact Ratings......5.8 FLA
34.8 LRA
NEMA Classification.................NEMA1
Specifications
Control Power Consumption.....3.6 VA
5
9
/ 16
1
1
/ 16
5
1
/ 2
3
1
/ 16
BACK
3
7
/ 8
1
5
/ 8
1
1
/ 8
1
5
/ 8
2
3
/ 8
BOTTOM
JOB_____________ ENGINEER_____________________CONTRACTOR____________________
Standard Application
Safgard 170, 500, 600 and 700 Series Low Water Cut-Offs are used as the primary low
water cut-off on residential and commercial water boilers. The 500 and 700 Series LWCOs
are also used as secondary controls on commercial steam boilers.
Features
Submittal Data Information
Probe Style Low Water Cut-Off - Commercial Hot Water Boilers
Effective: January 1, 2007
SF-500
Supercedes: NEW
Auto Reset Only/Auto Reset-Test Button/Manual Reset-Test Button/Manual Reset Only
Item Number
Model Number
NOTES
Low Maintenance - No moving parts
to wear or hang up, as in float devices.
More Probe Plate Space - Large probe
tip puts more conductive surface area
in the water, leading to more dependable
operation and less chance of nuisance
boiler shutdowns.
Automatic Reset - Shuts down the
burner when water drops below the
probe. Automatically recompletes
the burner circuit upon return of a
safe water level.
Operation
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 in
accordance with manufacturers instructions and local and State codes. 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 hydronic 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.
Manual Reset - Shuts down the
burner when water drops below the
probe for 2 seconds. Requires manual
reset if the water remains below the
probe for 30 seconds. Power failures
and air bubbles will not cause the
manual reset to lock out. Fully CSD-1
compliant. Lockout will not reset in a
power outage.
Test Button-Tests control operation
without lowering the water level.
Depressing the test button shuts
down the burner after two second
delay and lights low water indicating
LED. Depressing the test button a
full 30 seconds will send control into
manual reset.
MODEL
VOLTAGE
AUTO
RESET
MANUAL
RESET
TEST
BUTTON
CSD-1
COMPLIANT
24
170
500
550
600
650
700
750
24VAC
120VAC
24VAC
120VAC
24VAC
120VAC
24VAC
120VAC
83 Water Street, New Haven, CT 06511
www.hydrolevel.com
Phone: [phone]
Fax: [phone]
email address: [e-mail]
Visit our website at:
Control Housing
Glazed Ceramic
Probe Tip
3/4or 1/2 NPT Brass
MATERIALS OF CONSTRUCTION
Probe Insulator
Probe Nut
Galvanized Steel
316 Stainless Steel
Printed in the U.S.A.
Copyright 2006 - Hydrolevel Company
SF500-5/06