Hydrolevel 270SV User Manual

Model 270SV

High Water Limit

120 VAC Operating Voltage

utomatically interrupts pump or feeder when water contacts probe

A

rovides contacts for optional alarm

P

deal for boilers, receiver tanks and process applications.

I

ow maintenance — no moving parts to wear, stick or hang-up

L
Heavy-duty electro-mechanical design for long life

WARNING: To prevent
electrical shock or equip-

ment 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.

2. Probe Installation

1/4"

1. Where To Install

BOILER OR TANK
INSTALLATION

R

O

HIGHEST
PERMISSABLE
WATER LEVEL

LOWDOWN

B

VALVE

3. Control Mounting

The 3/4" NPTprobe must be installed
at a location just below the highest
permissable water level. The probe may
be installed in any metal tank, boiler, or
equalizing line. When installed in an
equalizing line, a proper blowdown
valve should be installed for regular
maintenance.

IMPORTANT: To assure proper
drainage, pipe diameter should be no
less than 1" on installations in vertical
piping.

Check to insure 1/4" clearance from the probe to
any surface inside the boiler, tank or tee. Apply
pipe sealing compound to threads.
Note: Use of Teflon tape is not recommended.

LIMITED

MANUFACTURERʼS WARRANTY

We wa rra nt pro duc ts man ufa ctu red by Hy dro lev el
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 yo u for s uch prod u cts. In no ev ent shal l
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.

Remove the control cover and slide key­hole slots over probe mounting screws
and tighten screws (with either a 1/4" hex
head driver or flat screwdriver).

Dimensions

Connect the ring terminal wire lead to the probe termi­nal stud and secure with the lock washer and wing nut
provided. With the power removed, proceed with
installation and wiring described on next page.

4. Wiring

TYPICAL WATER FEED CONTROL CIRCUIT

he Safgard 270SV High Limit wires in series with the system’s water

T
feed circuit.

STEP 1

Connect the hot lead of input voltage
(120 VAC, 60 Hz) to terminal H and the
neutral lead to terminal GN.

STEP 2

Connect the Feed/Pump Controller to
terminal C. Connect the Pump/Feeder to
terminal NC. When water reaches the
High Limit, contacts C-NC will open,
interrupting power to the Pump/Feeder.
Important: If the current of the Pump/
Feeder exceeds 15 amps, a suitable
relay/starter should be installed.

STEP 3
Optional High Water Alarm

Select an alarm with the same operating
voltage as the Pump/Feeder. Connect the
hot lead of the alarm to terminal NO.
Connect the neutral lead to the Feed cir­cuit neutral. When water reaches the
High Limit, contact C-NO will close,
powering the alarm.

MAINTENANCE

Remove and inspect probe annually. Clean any sediment or scale from the probe using a scouring pad or steel wool.

TROUBLE SHOOTING

IF THE PUMP DOES NOT OPERATE

1. Using a voltage meter, isolate the problem to determine if the 270SV High Limit Control is breaking the circuit.

2. Check to insure that the water level is below the probe and that the tee is not collecting water which could be sensed
by the probe.

3. Remove power and recheck wiring.

4. Remove power and check for adequate clearance from the probe to any surface inside the boiler or tee.

IF THE PUMP DOES NOT SHUT DOWN WHEN WATER REACHES THE HIGH LIMIT

1. Make sure that the high water level is in contact with the probe.

2. Ensure that the probe lead wire is fastened securely.

3. Check for proper ground between the probe and the boiler shell or tee. Excessive use of Teflon tape or sealing compound may
insulate the probe from ground.

4. Recheck wiring and test for correct incoming voltage.

Specifications

MAXIMUM PRESSURE: 250 PSI
INPUT VOLTAGE: 120 VAC, 60 HZ
SWITCH RATINGS: .25 hp @ 120 VAC
RESISTIVE LOAD: 20 A
SWITCH CONTACTS: SPDT

P.O. Box 1847
New Haven, CT 06508
Phone: [phone]
FAX: [phone]

45-2700