Hydrolevel 724 Series - Manual

724 Series
Low Water Cut-Off
Feeder Combination
for Steam Boilers
24 VAC Operating Voltage
HOW TO INSTALL
83 Water Street • New Haven, CT 06511 • Phone (203) 776-0473 • FAX (203) 773-1019 • www.hydrolevel.com
No moving parts in water.
No floats to hang-up or foul.
Unique two probe design. Bouncing
water line wonʼt cause on-off burner
cycling or water valve slamming
noise.
Easy installation. Quick hook-up
fittings adapt control to all 8" to 14"
sight glasses.
Simple fast wiring. Can be used with
any standard automatic water feeder.
WARNING: Power must be off during installation or servicing of the control. Only qualified personnel may install or service the
control in accordance with local codes and ordinances. Read instructions completely before proceeding. Caution – Disconnect power
supply before beginning installation to prevent electrical shock or equipment damage.
Remove gauge glass assembly and nipples replac-
ing nipples with two 6" brass nipples provided
Œ
.
Install 1/2" x 1/2" x 3/8" tee

on top nipple.
Install 1/2" x 2" brass nipple

and 1/2" x 1/2" x
1/2" tee
Ž
to 1/2" threaded hole in casting

.
Note: Casting is designed for either left or right
mounting on gauge glass. Be sure to plug hole on
opposite side.
Thread tee attached to casting into bottom 6" nip-
ple. Tighten until casting is vertical. Install compression fittings
’
into casting and
top tee. Size copper tubing
‘
and tighten
between the two compression fittings.
Attach control to probes using No. 8-32 self tap-
ping screws provided. Install blow down valve (by
others) in bottom 3/4" tapped hole. Be sure to
attach maintenance tag in prominent place near
valve. Reattach gauge glass cocks and gauge glass into
end of 1/2" tees. Pressure-trol can be threaded
into 1/8" threaded hole on top of casting. If pres-
sure-trol is not used, plug 1/8" hole on top of
casting. Attach blue probe lead wire to upper probe and
white probe lead wire to bottom probe with wing
nuts and lock washers provided.
Œ
(2) 6" x 1/2" brass nipples

(1) 1/2" x 1/2" x 3/8" tee
Ž
(1) 1/2" x 1/2" x 1/2" tee

(1) 2" x 1/2" brass nipple

(1) 711C manifold casting
‘
(1) 3/8" copper tube
’
(2) 3/8" compression fittings
“
(1) 3/4" nipple (not included)
”
(1) Blow down valve
(not included)
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5 6 7