Hydrolevel Safgard 250 Series Installation guide

Brand: Hydrolevel

Model: Safgard 250 Series

Type: Installation guide

Hydrolevel Safgard 250 Series

The Hydrolevel Safgard 250 Series is a pump control and low water cut-off combination designed to provide reliable protection for your boiler system. With its advanced electronic design and durable construction, the Safgard 250 Series is ideal for use in residential, commercial, and industrial applications.

No moving parts to stick, wear, or hang-up: The Safgard 250 Series utilizes solid-state electronics to eliminate the need for mechanical components, ensuring long-lasting reliability.
Reliable electronic design: The Safgard 250 Series employs advanced electronic circuitry to provide precise and dependable operation.

Hydrolevel Safgard 250 Series

No moving parts to stick, wear, or hang-up: The Safgard 250 Series utilizes solid-state electronics to eliminate the need for mechanical components, ensuring long-lasting reliability.
Reliable electronic design: The Safgard 250 Series employs advanced electronic circuitry to provide precise and dependable operation.

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, dea th 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.

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

INSTALLATION: MOUNTING LOCATION

INSTALLATION: MOUNTING

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 casing is at least 1/2"

above the lowest permissable water level

as speciﬁed by the boiler manufacturer.

Any model 250 should act as

the primary Low Water Cut-Off ONLY. It

should not be used as a secondary Low

Water Cut-Off.

Model 250 diagram on page 5. Model 250WC diagram on page 6.

Mount the Low Water Cut-Off and Pump Controller

See Figure 1 below. Mount and pipe the Low Water Cut Off Manifold on a vertical equalizing pipe at the required

elevation level determined in mounting location section above. Then, install a fully ported blow-down valve (and

discharge line) directly below the lower cross of the water equalizing pipe.

For best results, we recommend a dual valve blow-down system for the 250 Series Control.

Gauge Glass

Model 250WC is designed to have a gauge glass (not included) on the Low Water Cut Off Manifold (see diagram on

page 6 for mounting location).

VERTICAL

EQUALIZING

PIPE

250 LWCO

WATER

EQUALIZING

PIPE

UPPER BLOW-DOWN

VALVE (recommended)

LOWER BLOW-DOWN

VALVE

250 LWCO 250WC LWCO

LOW WATER CUT-OFF

LEVEL INDICATOR

LOW WATER CUT-OFF

LEVEL INDICATOR

Gauge Glass and relevant mounting

hardware not included (see Gauge

Glass section under Mounting below)

Figure 1 Control mounting

INSTALLATION: WIRING

MODEL 250 AND 250WC LADDER WIRING DIAGRAM

DANGER The Safgard 250 is intended as a pilot duty 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.

ALWCO

ALARM

RY2 N.C.

120VAC

HOT

TOP

MIDDLE

RY1

N.O.

INTERNAL

TRANSFORMER

BOILER

GROUND

BOTTOM

120VAC

NEUTRAL

FIELD

WIRING

RY1 N.C.

RY2 N.O.

FEED

PUMP

LIMITS BURNER

P P

PROBES

INTERNAL

WIRING

RY1

RY2

PROBE DATA

TYPICAL APPLICATIONS

PROBE TEST PRESSURE 1000PSI

1 Safgard 250 Pump Controller/LWCO combination

2 Safgard 270 High Water Limit/Alarm

3 Safgard 550 or 750 as Secondary LWCO

4 45-715 Feed Valve Assembly

5 Safgard 727 Tank Control

123

DIMENSIONS and CONTROL LAYOUT — Model 250 LWCO

MAXIMUM STEAM PRESSURE 250 PSI

DIMENSIONS and CONTROL LAYOUT — Model 250WC LWCO

REQUIRED BLOW-DOWN PROCEDURE

SERVICE / MAINTENANCE

In addition to the blow-down and test procedure above, the probes must be removed and examined annually. The

probes can usually be cleaned with a soft cloth although they are rugged enough to be cleaned with steel wool or a

scouring pad if a more crystalline or solid buildup is present. A more frequent examination interval may be necessary

based on the condition of the unit at time of inspection. Replacement may be necessary.

•

Probes should be inspected and cleaned more often on systems with high make-up water or untreated boiler water.

• After each scheduled or unplanned outage, the low water cut-offs should be dismantled, inspected, cleaned and

checked for proper performance.

Be sure to consult the boiler manufacturer’s manual for chemical water treatment and PH level

recommendations.

NOTICE – PLEASE READ The Series 250 control requires regular maintenance for safe

operation. Please read and understand the maintenance procedures listed in this manual as

well as any required maintenance procedures listed in the boiler manufacturer’s instructions.

WARNING 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. Failure to follow this caution could result in personal injury.

The 250 Series Control requires regular maintenance (including blowdown) to ensure continued safe operation.

During normal boiler function, sediment may accumulate in the low water cut-off’s probe housing. If left unchecked,

this sediment can build up, trap water in the probe housing, and prevent the control from detecting a low water con-

dition in the boiler. A regular blow down of the control is required for proper operation.

Blow Down Schedule

To ﬂush the sediment from the chamber, the control must be blown down in accordance with the following schedule:

• Daily if operating pressure is above 15PSI

• Weekly if operating pressure is below 15psi

Before Blow Down

Blow-down the 250 Series Control when the burner is on and the water level is at its normal operating level [between

middle (PUMP ON) probe and upper (PUMP OFF) probe, see diagrams on pages 5 and 6]. Conﬁrm water is visible

in the site glass. If not visible, shut the burner off, allow the boiler to fully cool, then add water until visible in the site

glass. Once water is visible, bring the boiler back up to temperature.

For best results, we recommend a dual valve blow-down system for the 250 Series Control.

Blow Down Instructions

1 Open the upper valve

2 SLOWLY open the lower valve

3 Drain the water until the water level falls below the lowest probe (LOW

WATER CUT OFF) on the control

a. As water in the sight glass lowers, the pump will turn on (water in site

glass falls below the middle probe) and the burner will turn off (water

in site glass falls below the lowest probe)

4 Conﬁrm that, once water falls below the lowest probe, the water is

running clean – free of major sediment

5 Once water runs clean, SLOWLY close the lower valve

6 Close the upper valve

7 At this step your pump should be on, raising the water in the site glass.

As the water rises above the lowest probe, your burner will turn on

NOTE: IF THE CONTROL DOES NOT OPERATE AS DESCRIBED IN

STEP 3a, IMMEDIATELY CLOSE ALL VALVES AND SHUT DOWN

THE BOILER. INSPECTION OF THE CONTROL MAY BE NECESSARY TO DETERMINE WHY THE CONTROL

WASN’T WORKING PROPERLY. AFTER THE PROBLEM HAS BEEN IDENTIFIED AND FIXED, RESET YOUR

CONTROL AND REPEAT INSTRUCTIONS ABOVE.

VERTICAL

EQUALIZING

PIPE

250 LWCO

WATER

EQUALIZING

PIPE

UPPER BLOW-DOWN

VALVE (recommended)

LOWER BLOW-DOWN

VALVE

126 Bailey Road • North Haven, CT 06473 • (203) 776-0473 • FAX (203) 764-1711 • www.hydrolevel.com

LIMITED MANUFACTURER’S WARRANTY

We warrant products manufactured by Hydrolevel Company to be free from defects

in material and workmanship for a period of two years from the date of manufacture

or one year from the date of installation, whichever occurs ﬁrst. In the event of any

claim under this warranty or otherwise with respect to our products which is made

within such period, we will, at our option, repair or replace such products or refund

the purchase price paid to us by you for such products. In no event shall Hydrolevel

Company be liable for any other loss or damage, whether direct, indirect, incidental

or consequential. This warranty is your EXCLUSIVE remedy and shall be IN PLACE OF

any other warranty or guarantee, express or implied, including, without limitation, any

warranty of MERCHANTABILITY or ﬁtness for a particular purpose. This warranty may

not be assigned or transferred and any unauthorized transfer or assignment thereof

shall be void and of no force or effect.

120622

NOTES

Hydrolevel Safgard 250 Series Installation guide

Brand: Hydrolevel

Model: Safgard 250 Series

Type: Installation guide

Hydrolevel Safgard 250 Series

No moving parts to stick, wear, or hang-up: The Safgard 250 Series utilizes solid-state electronics to eliminate the need for mechanical components, ensuring long-lasting reliability.
Reliable electronic design: The Safgard 250 Series employs advanced electronic circuitry to provide precise and dependable operation.

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Hydrolevel Safgard 250 Series Installation guide

Hydrolevel Safgard 250 Series Installation guide

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