Hydrolevel 24 User Manual
24 Series
Low Water Cut-Off
24 VAC Operating Voltage
Heavy-duty electro-mechanical design for long life.
Automatically shuts off burner in a low water condition to
prevent boiler damage.
Low maintenance. No moving parts to wear stick or hang up,
as in float devices.
Rugged construction. Designed for the heating professional.
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. Tee Options
STANDARD
REDUCING TEE
(SV Models Only)
FABRICATED TEE
1. Where To Install
HOT WATER BOILER
INSTALLATIONS
B
A
MINIMUM
WATER LEVEL
FOEM-TEE
(160psi)
1214C-2 TEE
(250psi)
C
D
HOT WATER
BOILER
HOT WATER BOILERS: Probe must be
installed at or above the minimum safe
water level established by the boiler
manufacturer. The probe may be
installed directly in the boiler if a suitable tapping is available (A), in the riser
(B), or in the header (C) or (D).
IMPORTANT: To assure proper
drainage, pipe diameter should be no
less than 1" on installations in vertical
piping and no less that 1
tions in horizontal piping.
3. Probe Installation
1
⁄4" on installa-
TEE MOUNTING: If a field fabricated tee is used, make sure that the tee drains thoroughly when the
water level falls below it, and that it conforms to the spacing requirements described in Step 3.
Models equipped with the shorter EL1214-SV probe can be installed in most standard reducing tees.
Safgard cast iron tees are also available to accommodate all probe models (See page 4).
4. Control Mounting
Loosen the two control box cover binding head screws and remove the cover.
Slide keyhole slots over probe mounting
screws and tighten screws (with either a
1/4" hex head driver or flat screwdriver).
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 according to Method A or B described on next page.
Check to insure 1/4" clearance from probe to
any surface within the boiler or tee. When
installed in a tee, the probe tip should extend
fully into the pipe run. Apply pipe sealing compound to threads.
Note: Use of Teflon tape is not recommended.
P1 P2 A
+
0
LIMIT
CONTROLS
BURNER
CIRCUIT
NEUTRAL
HOT
GN
H
ALARM
P1 P2 A
HOT
BURNER
CIRCUIT
NEUTRAL
GN
H
BURNER
POWER
SOURCE
(
24 or
120VAC)
P1 P2 A
NEUTRAL
HOT
BURNER
+
0
LIMIT
CONTROLS
GN
H
GN
P1 P2 A
BURNER
POWER
SOURCE
120V
AC
H
NEUTRAL
HOT
FACTORY
INSTALLED
JUMPER
H
P1P2 A
ALARM
GN
P2 A
120V
AC
H
NEUTRAL
HOT
P1
P1 P2 A
+
0
LIMIT
CONTROLS
BURNER
CIRCUIT
HOT
NEUTRAL
GN
H
WIRING METHOD A: SAME POWER SOURCE FOR CONTROL AND BURNER CIRCUIT.
A1
A3
䊴
A1 Connect the hot lead of the input volt-
age (120 VAC, 60 HZ) to terminal H. Connect
the neutral lead to terminal GN.
120 VAC, 60 HZ must be supplied to terminals
H and GN for internal operation of the control.
䊳䊳
Connect terminal GN to
A2
burner circuit neutral. Connect terminal P2 to
burner circuit in series with other limit controls.
Consult boiler manufacturer instructions for
proper terminal connections. Control should be
wired in series with and before other circuits.
䊴
A3 Optional alarm connection. Connect
alarm common to terminal GN. Connect alarm
hot to terminal A.
Upon completion of wiring, replace control
box cover.
A2
WIRING METHOD B: SEPARATE POWER SOURCE FOR CONTROL AND BURNER CIRCUIT.
B1
B3
䊴
B1 WARNING! Remove the jumper
between H and P1. Connect the hot lead of the
input voltage (120 VAC, 60 HZ) to terminal H.
Connect the neutral lead to terminal GN.
120 VAC, 60 HZ must be supplied to terminals
H and GN for internal operation of the control.
Connect hot lead from the 24 VAC
B2
䊳䊳
or 120 VAC burner power source to terminal P1.
This terminal supplies power to terminal P2 in
normal operating conditions when water is at
the probe. Connect neutral to burner circuit.
Note: consult boiler manufacturer instructions
for proper terminal connections.
䊴
B3 Connect terminal P2 to burner
circuit in series with and before other limit controls.
Optional alarm connection. Connect
B4
䊳䊳
alarm hot to terminal A. Connect alarm common
to neutral of the burner power source.
Upon completion of wiring, replace control
box cover.
WARNING: Be sure to
remove the jumper
between H and P1.
B2
B4
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