Hydrolevel 1150 User Manual

Model 1150

• ADVANCED SOLID STATE DESIGN

• TEST BUTTON FOR EASY DIAGNOSTICS

• POWER AND LOW WATER LED INDICATORS

Low Water Cut-Off
For Residential
Hot Water Boilers

120 VAC Operating Voltage

WARNING: To prevent electrical shock or equipment damage, power must be off during installation or servicing of the control. To pre­vent serious burns, the boiler should be thoroughly cooled before installing or servicing control. Only qualified personnel may install or
service the control in accordance with local codes and ordinances. Read instructions completely before proceeding.

Step 

• COMPACT SIZE ALLOWS FOR MOUNTING IN TIGHT SPACES

• DESIGNED FOR GAS AND OIL FIRED BOILERS

Step 

Remove center
extended nut.
Apply pipe
sealing
compound to
probe threads
and install in
boiler or tee.
Tighten so that
the two smaller
extended nuts
are horizontally
aligned.

Determine Mounting Location

The Safgard 1150 must be installed at or above the
minimum safe water level established by the boiler
manufacturer. The 1150 can be installed directly into
the boiler if a suitable tapping is available훽. The
1150 can also be installed in the boiler piping using a
standard 3/4" tee훾.

IMPORTANT: Check for adequate clearance
(minimum 1/4") from metal probe sensor to any
surface inside the boiler or pipe.

Do not install in a location that could hold or trap
water in the event of a low water condition.

Step 

Mount the control box on the probe by aligning the
keyhole slots with the two extended nuts. Replace
the center extended nut. Secure the control box by
tightening all three extended nuts.

IMPORTANT: Extended nuts must be tightened
securely for proper grounding.

83 Water St. • New Haven, CT 06511 • Phone: [phone] • FAX: [phone] • www.hydrolevel.com

STANDARD WIRING METHOD

This wiring method will shut down all power to the boiler in the event of a low water condition.

USE WIRE NUTS FOR ALL CONNECTIONS



Step  Connect the black wire (H) and one of

the yellow wires (CUT-OFF) from the Safgard 1150 to
the hot 120 VAC lead coming from the service switch.





Step  Connect the white wire (N) from the

Safgard 1150 to the neutral 120 VAC lead and to the
(L2) boiler connection.

Step  Connect the second yellow wire

(CUT-OFF) from the Safgard 1150 to the (L1) boiler
connection.

OPTIONAL WIRING METHOD

This wiring method will interrupt power only to the burner circuit in the event of a low water condition.

USE WIRE NUTS FOR ALL CONNECTIONS

Connect the black wire (H) from the Safgard
1150 to the hot 120 VAC lead coming from
the service switch. Connect the white wire (N)
to the neutral 120 VAC lead. Locate and
break into the burner circuit. Connect the yel­low wires (CUT-OFF) from the Safgard 1150
in series with other limit controls as shown.