Chromalox
®
DIVISION
4
SECTION
WC
SALES
REFERENCE
DATE
SERVICE REFERENCE
Installation, Operation
and
RENEWAL PARTS IDENTIFICATION
PK426-8
161-048505-001
OCTOBER, 2002
(Supersedes PK426-7)
© 2010 Chromalox, Inc.
Low Liquid Cutoff
(Type WC and WCS)
GENERAL
NOTE: The thermal cutout mechanism in this low-liquid cutoff is
designed for temperature sensing only. Because it will not fail
safe, the low-liquid cutoff cannot be classified as a safety device.
Users should install adequate back-up controls
and safety devices with their electric heating
equipment. Where the consequences of failure
may be severe, back-up controls are essential.
Although the safety of the installation is the
responsibility of the user, Chromalox will be glad
to make equipment recommendations.
Provides protection for immersion heaters from low-liquid
level burnout in most types of solutions up to 240˚F. Exposure of
cutoff element de-energizes the external immersion heater circuit.
After liquid level is restored, pushing reset button re-energizes
heater. Pilot lamp (E1 Models only) glows when heater is ener-
gized. Switch is SPST, snap-acting.
Cutout contact (switch) rating is 25 Amps at 277 Volt maxi-
mum. For large heater currents or higher voltages, use contactor.
INSTALLATION
Hazard of electric shock. Disconnect all power
before installing.
1. Refer to Figures 4 and 5 for installation instructions.
2. For convenience, mount low-liquid cutoff and element on same
side of tank.
3. Cutoff should be mounted horizontally at the minimum per-
missible liquid level.
4. Cutoff should be mounted no less than 4” above heater.
Figure 2
E2 Terminal Enclosure
Moisture Tight/Explosion Resistant
Figure 1
E1 General Purpose Enclosure
Heavy Tank Walls may be drilled and tapped - if thickness is sufficient to engage
3/4 of threads.
Lighter Tank Walls are usually equipped with suitable pipe coupling, attached
with proper solder or weld material. CAUTION: Care must be taken to insure the
heated portion does not extend into the coupling area (see Dimensions).
WC(S) can generally be used at pressures up to 300 psi
5/8” Approx.
Cold End
Figure 4 - Exploded View Screwplug Mounting
1/2” Conduit
Opening
1-1/2”
Locate Drain Pipe at Bottom of Heater,
Sludge Deposits may be
Removed Through Drain Pipe
Maximum Sludge Level.
Install Heater Above
This Level But As
Near to it as Possible for Maximum
Heated Liquid Storage Capacity
Drip Loop Recommended
to Minimize Passage of Moisture
Along Wiring Into Terminal
Wiring and Connections
Outlet
Inlet
Heater
Minimum
Water
Level
WC(S)
4" Min.
Figure 5 - Typical Installation
Model Volts Watts
Figure Design
No. Type
WC-120 120 100 1 Straight
WC-240 240 200 3 Fold Back
WCS-120 120 100 1 Straight
WCS-240 240 200 3 Fold Back
WC-120E2 120 100 2 Straight
WC-240E2 240 200 2 & 3 Fold Back
WCS-120E2 120 100 2 Straight
WCS-240E2 240 200 2 & 3 Fold Back
Sheath material for all models is INCOLOY
®
.
Thermowells are Copper for the WC and INCOLOY
®
for the WCS.
Screw plugs are Brass for the WC and Stainless Steel for the WCS.
Figure 3
Foldback Design
1”
Standard
Pipe Thread
11-5/16”
8-1/2”
2-15/16”
5/8” Approx.
Cold End
1-1/2”
3/4” Standard
Pipe Thread
Specifications —
WIRING
Hazard of electric shock. Any installation involving
electric heaters must be effectively grounded in
accordance with the National Electrical Code.
1. Electric wiring must be installed in accordance with the
National Electrical Code and with local codes by a qualified
person.
WARNING: Use copper conductors only.
2. Connect wires according to wiring diagram (Figure 6 or 7).
Note: Electrical connections should be made with generous
loops of wire — approximately 6” per lead.
Figure 6 — Typical Wiring 120V Control Figure 7 — Typical Wiring 240V Control
OPERATION
If liquid level drops below the low-liquid cutoff, the heater
circuit will be de-energized. After the correct liquid level is
reached, operation may be restored by pushing the reset button.
WARNING: Do not hold-in the reset button manually,
as the heating element may be damaged.
Models with the E1 enclosure are equipped with a pilot light
for a visual indication that the heating element is energized.
MAINTENANCE
Hazard of electric shock. Disconnect all power
before servicing this control and/or associated
heaters. Failure to comply can result in electrical
shock or electrocution.
To insure best performance, the cutoff element should be free
of mineral deposits, sludge, etc. Periodic inspections should be
made and the element cleaned if necessary.
RENEWAL PARTS IDENTIFICATION
Model Terminal Cover Terminal Cup Pilot Light
WC(S)-120
306-046598-001 082-046599-001
213-019794-001
WC(S)-240 213-019794-002
2150 N. RULON WHITE BLVD., OGDEN, UT 84404
Phone: 1-800-368-2493 www.chromalox.com
Common Part
Cutout 300-026603-009
COIL
Contactor
Thermostat
Cutout
Fused 120V
Control
CircuitElement
Pilot Light
(E1 Models Only)
Low-Liquid Cutoff
To additional
Contactors
Load Line
C
L1
L1
L2
C
NC
C
NC
NC
C
COIL
Contactor
Thermostat
Cutout
Fused 240V
Control
CircuitElement
Pilot Light
(E1 Models Only)
Low-Liquid Cutoff
To additional
Contactors
Load Line
C
L1
L1
L2
Limited Warranty:
Please refer to the Chromalox limited warranty applicable to this product at
http://www.chromalox.com/customer-service/policies/termsofsale.aspx.
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