INSTALLATION & OPERATION OF FEEDER:
For WF Models
ONLY
A feed valve is supplied standard with con-
trol model 711WF. It is recommended that a
shut-off valve and union be installed on
either side of the water feed valve and a by-
pass valve and piping be installed to permit
removal of the water feed valve should serv-
ice be required. During normal operation,
by-pass valve should be closed and isolation
valves should remain open.
PRINCIPLE OF OPERATION
Hydrolevel controls are electronically operat-
ed. Water is used as an electrical conductor
to complete a circuit from the probe to the
control unit. The control unit provides
switching contacts to operate the burner cir-
cuit and optional water feeder.
The 711 Series low water cut-off is designed
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 closed).
When the water level falls below the lower
probe, the control will de-energize the burn-
er circuit. The control will not re-energize the
burner until the water level is restored to the
upper probe level.
The 711WF includes a feed valve designed to
automatically restore the water level in the
event of a low water condition. When water
falls below the lower probe, the 711 will
energize the feed valve (switch contact 1 –
A make). When the boil er water level is
restored to the upper probe, the 711 will de-
energize the feed valve and restore burner
operation. The 711CF does not include a
feed valve, but does provide contacts for
operation of a steam boiler water feeder.
NOTE:
711CF is only compatiable with
a 120V Feeder
See page 6 for information on the VXT
Water Feeder.
4
The following maintenance must be performed by a qualified service technician:
Annually
• Remove and clean the strainer located on the valve body.
IMPORTANT:
If the strainer shows signs of mineral deposits collecting on the
screen, install a Hydrolevel Feed Valve Service Kit (Part No. 45-715).
Every 3 Years
I
nstall Hydrolevel Feed Valve Service Kit (Part No. 45-345).
Note:
If hardened calcium deposits have formed on the brass surface inside the
valve, replace the valve (Part no. 45-343).
12 Years
Replace the Feed Valve Assembly after 12 years of service.
WARNING
Water Damage Potential:
Failure to maintain the feed valve can result in excess mineral deposits
collecting in the valve. If left unchecked, these deposits can impede valve operation with the potential
for overfilling the heating system and allowing water to escape radiators into the living space.
Feed Valve Maintenance (WF Models Only)
