safgard 711 Series User manual

Re d nd underst nd these instructions completely before inst lling or servicing this control.
S ve these instructions for future reference.
Disconnect power supply before beginning inst ll tion to prevent electric l shock or equipment
d m ge.
Only qu lified personnel m y inst ll or service the control in ccord nce with loc l codes nd
ordin nces.
This low w ter cut-off must be inst lled in series with ll other limit nd oper ting controls inst lled on
the boiler. After inst ll tion, check for proper oper tion of ll of the limit nd oper ting controls, before
le ving the site.
We recommend th t second ry (redund nt) Low W ter Cut-Off controls be inst lled on ll ste m
boilers with he t input gre ter th n 300,000 BTU/hour or oper ting bove 15 psi of ste m pressure.
At le st two controls should be connected in series with the burner control circuit to provide s fety
redund ncy protection should the boiler experience low w ter condition. Moreover, t e ch nnu l
out ge, the low w ter cut-offs should be dism ntled, inspected, cle ned, nd checked for proper
perform nce.
To prevent serious person l injury from ste m nd hot w ter m ke sure there is disch rge line from
the blow down v lve to proper pl ce of dispos l.
To prevent fire, do not use this low w ter cut-off to switch currents over 7.4A, 1/3 Hp t 120 VAC or
3.7A, 1/3 Hp t 240 VAC, unless st rter or rel y is used in conjunction with it.
Previous controls should never be inst lled on new system. Alw ys inst ll new controls on new
boiler or system. F ilure to follow this w rning could c use property d m ge, person l injury or
de th.
CAUTION A more frequent repl cement interv l m y be necess ry b sed on the condition of the unit
t time of inspection. Hydrolevel’s w rr nty is two (2) ye rs from the d te of m nuf cture.
WARNING
26 Bailey Road, North Haven, CT 06473 • Phone [phone] • FAX [phone] • www.hydrolevel.com
711 Series
Lo Water Cut-Off
Feeder Combination
for Steam Boilers
120 VAC Operating Voltage
No movi g parts i water.
No floats to ha g-up or foul.
U ique two probe desig .
Bou ci g water li e wo ’t
cause o -off bur er cycli g or
water valve slammi g oise.
Easy i stallatio . Quick
hook-up fitti gs adapt co trol
to all 8" to 14" sight glasses.
Simple fast wiri g. Ca
be used with a y sta dard
automatic water feeder.

HOW TO INSTALL
Remove gauge glass assembly an nipples
replacing nipples with two 6" brass nipples
provi e ➀. Install 1/2" x 1/2" x 3/8" tee ➁
on top nipple.
Install 1/2" x 2" brass nipple ➃an 1/2" x
1/2" x 1/2" tee ➂to 1/2" threa e hole in
casting ➄.
NOTE: Casting is esigne for either left or
right mounting on gauge glass. Be sure to
plug hole on opposite si e.
Threa tee attache to casting into bottom 6"
nipple. Tighten until casting is vertical.
Install compression fittings ➆into casting
an top tee. Size copper tubing ➅an tight-
en between the two compression fittings.
Attach control to probes using No. 8-32 self
tapping screws provi e . Install nipple an
blow own valve (with ischarge line) in bot-
tom 3/4" tappe hole.
Reattach gauge glass cocks an gauge glass
into en of 1/2" tees. Pressure-trol can be
threa e into 1/8" threa e hole on top of
casting. If pressure-trol is not use , plug
1/8" hole on top of casting.
Attach blue probe lea wire to upper probe
an white probe lea wire to bottom probe
with wing nuts an lock washers provi e .
MODEL 711 COMES WITH:
➀ (2) 6" x 1/2" brass nipples
➁ (1) 1/2" x 1/2" x 3/8" tee
➂ (1) 1/2" x 1/2" x 1/2" tee
➃ (1) 2" x 1/2" brass nipple
➄ (1) 711C manifol casting
➅ (1) 3/8" copper tube
➆ (2) 3/8" compression fittings
➇ (1) 3/4" nipple
➈ (1) Blow own valve
1
234
567
2
NOTE: Discharge line
not inclu e .

WIRING METHOD A: Same 120V Power Source for Control an Burner Circuit
WIRING METHOD B: For use with Gas Boilers or Separate Power Source for Control an Burner Circuit
BURNER
POWER
SOURCE
120V
AC
60HZ
NEUTRAL
HOT
DISCONNECT
SWITCH
BURNER
POWER
SOURCE
120V
AC
60HZ
BURNER
POWER
SOURCE
120V
AC
60HZ
NEUTRAL
HOT
BURNER
+0
LIMIT
CONTROLS
BURNER
POWER
SOURCE
120V
AC
60HZ
BURNER
+0
FEEDER VALVE
CONTROL
POWER
SOURCE
120V
AC
60HZ
NEUTRAL
HOT
DISCONNECT
SWITCH
CONTROL
POWER
SOURCE
120VAC
60HZ
HOT
BURNER
CIRCUIT
DISCONNECT
SWITCH
CONTROL
POWER
SOURCE
120V
AC
60HZ
+0
LIMIT
CONTROLS
BURNER
CIRCUIT
CONTROL
POWER
SOURCE
120V
120V
AC
60HZ
+0
LIMIT
CONTROLS
BURNER
CIRCUIT
FEEDER VALVE
A1 Connect input voltage (120 VAC,
60HZ) to terminals 2 an 1. 120
VAC, 60HZ must be supplie to terminals 2
an 1 for internal operation of the control.
Install a jumper between terminal A2
1 an terminal P1. Power from
terminal P1 is supplie to terminal P2 when
water reaches the upper probe. Power to ter-
minal P2 is remove when water falls below
the bottom probe.
A3 Connect terminal 2 to burner circuit
neutral. Connect terminal P2
to burner circuit in series with other limit
controls. Consult boiler manufacturer’s
instructions for proper terminal connections.
NOTE: Control is wire in series with an
before other limits.
Fee er Connection: Connect fee er A4
common to terminal 2. Connect
fee er hot to terminal A. Whenever water
falls below the lower probe, power is sup-
plie to the fee er terminal A. When water
reaches the upper probe, power to the fee er
is remove .
B1 Connect input voltage (120 VAC,
60HZ) to terminals 2 an 1. 120
VAC, 60HZ must be supplie to terminals 2
an 1 for internal operation of the control.
Connect hot lea from burner B2
control circuit to terminal P1.
This terminal supplies power to terminal P2
in normal operating con itions when water
is at the probe. Connect neutral to burner
circuit.
NOTE: Consult boiler manufacturer’s instruc-
tions for proper terminal connections.
B3 Connect terminal P2 to burner cir-
cuit in series with other limit
controls. Consult boiler manufacturer’s
instructions for proper terminal connections.
NOTE: Control is wire in series with an
before other limits.
Fee er Connection: Connect fee er B4
common to terminal 2. Connect
fee er hot to terminal A. Whenever water
falls below the lower probe, power is sup-
plie to the fee er terminal A. When water
reaches the upper probe, power to the fee er
is remove .
NOTE: All schematic iagrams show all systems in
the off position. No power applie .
A1
A3 A4
B1 B2
B3 B4
A2
3

INSTALLATION & OPERATION OF FEEDER: For WF Mo els ONLY
A fee valve is supplie stan ar with con-
trol mo el 711WF. It is recommen e that a
shut-off valve an union be installe on
either si e of the water fee valve an a by-
pass valve an piping be installe to permit
removal of the water fee valve shoul serv-
ice be require . During normal operation,
by-pass valve shoul be close an isolation
valves shoul remain open.
PRINCIPLE OF OPERATION
Hy rolevel controls are electronically operat-
e . Water is use as an electrical con uctor
to complete a circuit from the probe to the
control unit. The control unit provi es
switching contacts to operate the burner cir-
cuit an optional water fee er.
The 711 Series low water cut-off is esigne
to maintain a safe operating water level in
the boiler. When water is in contact with the
upper probe, the control enables the burner
to fire (switch contacts P1 – P2 are close ).
When the water level falls below the lower
probe, the control will e-energize the burn-
er circuit. The control will not re-energize the
burner until the water level is restore to the
upper probe level.
The 711WF inclu es a fee valve esigne to
automatically restore the water level in the
event of a low water con ition. When water
falls below the lower probe, the 711 will
energize the fee valve (switch contact 1 –
A make). When the boil er water level is
restore to the upper probe, the 711 will e-
energize the fee valve an restore burner
operation. The 711CF oes not inclu e a
fee valve, but oes provi e contacts for
operation of a steam boiler water fee er.
NOTE: 711CF is only compatiable with
a 120V Fee er
See page 6 for information on the VXT
Water Fee er.
4
The followi g mai te a ce must be performed by a qualified service tech icia :
A ually
• Remove an clean the strainer locate on the valve bo y. IMPORTANT: If the strainer shows signs of mineral eposits collecting on the
screen, install a Hy rolevel Fee Valve Service Kit (Part No. 45-715).
Every 3 Years
Install Hy rolevel Fee Valve Service Kit (Part No. 45-345). Note: If har ene calcium eposits have forme on the brass surface insi e the
valve, replace the valve (Part no. 45-343).
12 Years
Replace the Fee Valve Assembly after 12 years of service.
WARNING Water Damage Pote tial: Failure to maintain the fee valve can result in excess mineral eposits
collecting in the valve. If left unchecke , these eposits can impe e valve operation with the potential
for overfilling the heating system an allowing water to escape ra iators into the living space.
Feed Valve Maintenan e (WF Models Only)

SERVICE / MAINTENANCE
The 711 Series Control requires regular
maintenance to ensure continue , safe oper-
ation. During normal boiler function, se i-
ment may accumulate in the low water cut-
off's probe housing. If left unchecke , this
se iment can buil up, trap water in the
probe housing, an prevent the control from
etecting a low water con ition in the boiler.
A regular blow own of the control is
require for proper operation.
To flush the se iment from the chamber, the
control must be blown own throughout the
heating season in accor ance with the fol-
lowing sche ule:
• Daily for first week following control
installation
• Prior to heating season startup in the fall
• Once per week uring the heating season
I structio s: Confirm water is visible in the
gauge glass. If not visible, shut the burner
off, allow the boiler to fully cool, then a
water until visible in the gauge glass. Once
water is visible, bring your boiler back up to
temperature. With the boiler running, place a
heat resistant pail irectly beneath the con-
trol casting blow own valve. Open the valve
an allow the se iment an water to rain
into the pail. Continue to rain the water
until it runs clean (One to two gallons is gen-
erally sufficient). Close the valve when com-
plete . Replenish the water in the boiler if
nee e .
OPERATING INSTRUCTIONS
TROUBLESHOOTING
1If the burner oes not shut own upon
water falling below the lower probe:
Remove power to the burner an check
installation. Check wiring an make sure
that burner is connecte to the fourth ter-
minal from left on terminal (P2). If wiring
is correct, check to make sure the probes
are not falsely groun e . Voltage between
the probes an chassis groun shoul be
120-140 VAC with water beneath both
probes. A lower rea ing may in icate a
shorte probe. Remove probes an check
for contamination.
2If the burner will not fire with water at the
top probe: With a voltmeter an power
applie at terminals G an H: Check the
voltage between the upper probe an
chassis groun . Rea ing shoul be 0-10
VAC with water at the upper probe. A
higher rea ing may be the result of poorly
con uctive water or probe contamination.
Remove probes an check for contamina-
tion. If the burner will still not fire after
cleaning probes, contact factory for assis-
tance.
5
DIMENSIONS
NOTE: Hy rolevel recommen s that the boil-
er manufacturer’s proce ures for skimming
the boiler be performe prior to placing the
control into operation.
1After installation, raise the boiler water
level until water is in contact with the
upper probe. Turn on power an set the
thermostat to call for heat. The burner
shoul fire imme iately.
2Using the boiler rain, slowly lower the
water level to a point below the lower
probe. The burner shoul shut own
imme iately upon a low water con ition.
NOTE: The water shoul not be lowere
beyon a visible point on the gauge glass.
IMPORTANT: If the burner oes not shut
own in a low water con ition, turn off
power imme iately an refer to trou-
bleshooting instructions below.
REGULAR MAINTENANCE
REQUIRED. Failure to
properly maintain the control can lea to
severe amage to the boiler, other property,
personal injury, or eath.
To prevent serious person-
al injury from steam an
hot water, make sure there is a ischarge line
from the blow own valve to a proper place of
isposal. Failure to follow this caution coul
result in personal injury.

SPECIFICATIONS
MAXIMUM PRESSURE: 15 PSI
INPUT VOLTAGE: 120 VAC, 60 HZ
SWITCH RATINGS: 5.8 FLA, 34.8 LRA
SWITCH CONTACTS: SPDT
ALARM CIRCUIT: 125 VA @ 120 VAC
Pilot Duty
LIMITED MANUFACTURER’S WARRANTY
We warrant pro ucts manufacture by Hy rolevel Company to be free
from efects in material an workmanship for a perio of two years from
the ate of manufacture or one year from the ate of installation,
whichever occurs first. In the event of any claim un er this warranty or
otherwise with respect to our pro ucts which is ma e within such peri-
o , we will, at our option, repair or replace such pro ucts or refun the
purchase price pai to us by you for such pro ucts. In no event shall
Hy rolevel Company be liable for any other loss or amage, whether
irect, in irect, inci ental or consequential. This warranty is your EXCLU-
SIVE reme y an shall be IN PLACE OF any other warranty or guarantee,
express or implie , inclu ing, without limitation, any warranty of MER-
CHANTABILITY or fitness for a particular purpose. This warranty may not
be assigne or transferre an any unauthorize transfer or assignment
thereof shall be voi an of no force or effect.
OPTIONS
The VXT water fee er (available separately)
can be use with Hy rolevel or other low
water cut-offs to automatically replenish
boiler water in the event of a low water con-
ition. The VXT offers programmable fee
amount an fee elay settings. These can
easily be set to ensure the proper fee
amount an to provi e a equate time for
con ensate to return to the boiler before
starting a fee cycle. The VXT’s igital fee
counter tracks the amount of water a e to
the boiler exposing system leaks, which can
significantly shorten the life of a cast iron
boiler. A itional features inclu ing a manual
fee button un erfee an floo protection,
make the VXT an i eal choice for safety an
convenience.
26 Bailey Road, North Haven, CT 06473 • Phone [phone] • FAX [phone] • www.hydrolevel.com
WARNING Frozen pipes/water damage. Central heating systems are prone to shut own as a result of power or fuel outages,
safety relate fault con itions or equipment failure. Installation of freeze protection monitoring or other precautions
is recommen e for unatten e wellings in climates subject to sustaine below-freezing temperatures.
041822
6