Hydrolevel 700 User Manual
Low Water Cut-Of fs
500/600/700 Series
24 VAC Operating Voltage
WARNING: To prevent electrical shock or equipment 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.
1. Where To Install
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.
Test button (500 & 600 Series) allows the burner circuit and
control to be tested without lowering the water level.
Manual reset feature (500 & 700 Series) will not lock out in power
failures.
HOT WATER BOILER
INSTALLATIONS
A
MINIMUM
WATER LEVEL
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 (A) if a suitable tapping is available, in the
riser (B), in the header horizontally (C), or in the header
vertically (D). IMPORTANT: To assure proper drainage,
pipe diameter should be no less than 1" on installations
in vertical piping and no less than 1
horizontal piping.
B
D
C
HOT WATER
BOILER
1
⁄4" on installations in
2. Tee Options
STANDARD
REDUCING TEE
(SV Models Only)
FABRICATED TEE
TYPICAL STEAM BOILER
INSTALLATIONS
SECONDARY
LWCO
AB
STEAM BOILERS (Secondary) : Control must be installed in a suitable tapping provided in
the boiler(A), or in an equalizing line(B). The control should be located below the level of the
primary low water cut-off but above the lowest permissable water line as specified by the
boiler manufacturer.
Note: For installations in equalizing lines, Hydrolevel recommends the use of Safgard Tees
(see step 2).
LOW WATER
CUT-OFF PUMP
CONTROLLER
LOW WATER
CUT-OFF PUMP
CONTROLLER
SECONDARY
LWCO
3. Probe Installation
FOEM-TEE
(160psi)
1214C-2 TEE
(250psi)
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,
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.
proceed with installation and
WIRING METHOD A: SAME POWER SOURCE FOR CONTROL AND BURNER CIRCUIT.
A1
䊴
A1 Connect the hot lead of the input
A2
voltage (24 VAC, 60 HZ) to terminal 1. Connect
the neutral lead to terminal 2. 24 VAC, 60 HZ
must be supplied to terminals 1 and 2 for inter-
2
1
P1 P2 A
nal operation of the control.
Install a jumper between terminal
A2
䊳
21
P1 P2 A
1 and terminal P1. Power from terminal P1 is
supplied to terminal P2 through the control
BURNER
NEUTRAL
POWER
SOURCE
24VAC
60HZ
HOT
A3 A4
relay when water is at the probe.
䊴
A3 Connect terminal 2 to burner circuit
BURNER
POWER
SOURCE
24VAC
60HZ
neutral. Connect terminal P2 to burner circuit in
series with other limit controls. Consult boiler
21
P1 P2 A
manufacturer instructions for proper terminal
connections. Control should be wired in series
with and before other circuits.
Optional alarm connection.
A4
䊳
1
P1 P2 A
Connect alarm common to terminal 2.
Connect alarm hot to terminal A.
Upon completion of wiring, replace control
box cover.
ALARM
BURNER
+
LIMIT
CONTROLS
NEUTRAL
HOT
0
WIRING METHOD B: SEPARATE POWER SOURCE FOR CONTROL AND BURNER CIRCUIT.
B1
BURNER
POWER
SOURCE
24VAC
60HZ
B3
NEUTRAL
HOT
NEUTRAL
HOT
2 1
BURNER
CIRCUIT
2
1
P1 P2 A
+
LIMIT
CONTROLS
P1 P2 A
0
䊴
B1Connect the hot lead of the input
voltage (24 VAC, 60 HZ) to terminal 1. Connect
the neutral lead to terminal 2. 24 VAC, 60 HZ
must be supplied to terminals 1 and 2 for internal operation of the control.
Connect hot lead from the 24 VAC
or 120 VAC burner power source to
B2
䊳
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
alarm hot to terminal A. Connect alarm common
to neutral of the burner power source.
Upon completion of wiring, replace control
box cover.
BURNER
POWER
SOURCE
(24 or
120VAC)
HOT
NEUTRAL
HOT
NEUTRAL
21
BURNER
CIRCUIT
21
BURNER
CIRCUIT
P1 P2 A
+
LIMIT
CONTROLS
P1 P2 A
0
B2
B4
ALARM
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