Chromalox WC Installation guide

Brand: Chromalox

Model: WC

Type: Installation guide

Chromalox WC is a low-liquid cutoff designed to protect immersion heaters from low-liquid level burnout in most types of solutions up to 240°F. It features a thermal cutout mechanism for temperature sensing, a SPST, snap-acting switch with a contact rating of 25 Amps at 277 Volt maximum, and a pilot lamp (E1 Models only) that glows when the heater is energized. The WC can generally be used at pressures up to 300 psi and can be mounted horizontally at the minimum permissible liquid level, no less than 4” above the heater.

Chromalox

DIVISION

SECTION

SALES

REFERENCE

DATE

SERVICE REFERENCE

Installation, Operation

and

RENEWAL PARTS IDENTIFICATION

PK426-8

161-048505-001

OCTOBER, 2002

(Supersedes PK426-7)

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

COIL

Contactor

Thermostat

Cutout

Fused 240V

Control

CircuitElement

Pilot Light

(E1 Models Only)

Low-Liquid Cutoff

To additional

Contactors

Load Line

Limited Warranty:

Please refer to the Chromalox limited warranty applicable to this product at

http://www.chromalox.com/customer-service/policies/termsofsale.aspx.

Chromalox WC Installation guide

Chromalox WC Installation guide

Chromalox WC Installation guide

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