Hydrolevel 250 User Manual

No moving parts to stick, wear or hang-up.

250 Series

Pump Control Low Water
Cut-Off Combination

120 VAC Operating Voltage
Max. Pressure 250 psi

LISTED

HOW TO INSTALL

WARNING!

1

WARNING: To prevent electrical shock
and 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.

No replacement or rebuilding of floats or
mechanical parts.

Reliable Electronic Design

Made in the U.S.A

LOCATION

2

Install the Safgard 250 in a
1" equalizing line equipped
with a blow-down valve
meeting applicable state
and local codes. The control
should be located so that
the "LOW WATER CUT-OFF LEVEL marked on the control casting
is at least 1/2 above the lowest permissible water level as specified
by the boiler manufacturer.

LOW WATER CUT-OFF

LEVEL INDICATOR

TYPICAL APPLICATIONS

1

Safgard 250 Pump Controller LWCO Combination

1

Safgard 270 High Water Limit/Alarm

2

3

Safgard 550 or 750 as Secondary LWCO

2

3

Safgard VF-120 Solenoid Valve

4

5

Safgard 727 Tank Control

4

INCOMING WATER LINE

5

WIRING

HOTHOT

COMMONCOMMON

HOTHOT

NEUTRALNEUTRAL

H H

PP

PPPFEFEFEAA

VV

MODEL 250 Low Water Cut-Off and Pump Control

 ALL WIRING SHALL

BE NEC CLASS I

 OPEN CIRCUIT

VOLTAGE TO PROBE
140 VAC

FEED

PROBE

(FEED ON)

MAXIMUM PRESSURE: 250 PSI

INTERNAL WIRING

GGG

NEUTRAL

H

HOT

120 VAC 60 HZ

INCOMING

POWER

P

LIMIT

BURNER

HOT

COMMON

BURNER POWER

SOURCE

5.8 FLA 34.8 LRA

BLUE

WHITE

UPPER PROBE

(FEED OFF)

A

V

TO FEED
PUMP CONTROL
CIRCUIT
125 VA PILOT DUTY

TO ALARM CIRCUIT
120 VA, 60 HZ, 10A

LOWER
PROBE
(LWCO)

The Safgard 250 requires connection to a 120VAC power source to enable the control to operate.

IMPORTANT!

The Safgard 250 is intended as a pilot control only and must be installed with a relay
between it and both the condensate pump and burner circuit. Direct wiring of the control
to either the burner circuit or condensate pump can result in failure of the control.

250 PUMP TERMINALS

A

V

LINE

TYPICAL PUMP STARTER WIRING. SEE RELAY MANUFACTURERS
INSTRUCTIONS FOR MORE COMPLETE INFORMATION.

DIMENSIONAL DATA

1 NPT (BOTH ENDS)

PUMP OFF

1/4

3

PUMP ON

1

1/16

1

3/16

1/2

8

1/4

2

7 MAX

PROBE DATA

2

SQUARE

LOW WATER CUT-OFF

6 MAX

Maximum Steam Pressure 250 PSI

15/16

7/8

1

3/4 NPT

1

5/16

13/16

3

Probe Test Pressure 1000 PSI