IQ Low Water Cutoff Instructions

ManualsBrandsBurnham ManualsBoiler PartsLow Water Cutoff (LWCO) IQ Option Card Kit (Auto Reset)

Page 1 of 8

APPLICATION

The Low Water Cutoff (LWCO) IQ Option Cards are

advanced, microprocessor based low water cutoffs for

detecting the absence of water in a heating system.

LWCO IQ Option Cards use patented signal processing

to identify when the probe signal levels have decreased

due to possible fouling. This advanced technologies permit

extended operation for probe impedances up to 40K Ohms.

The LWCO IQ Option Cards function longer without requiring

probe cleaning, and function normally under non-ideal

installation conditions.

This product may be applied to either gas or oil red hot

water boilers equipped with the IQ Control System. The

LWCO IQ Option card may be simply “plugged in” to the

IQ Option Panel and only requires probe installation and

prefabricated probe wire connection to become operational.

GENERAL

The LWCO IQ Option Cards are available in automatic

or manual reset models. Automatic reset versions

automatically reset when water levels return to safe levels.

Manual reset models require user intervention to reset a

low water condition after water levels return to safe levels.

Manual reset models will not “lock out” upon power loss

provided water still covers the probe when power returns.

SPECIFICATIONS

Listings/Approvals:

• UL GUIDE (MBPR2) for Limit Controls per UL Standard

353 Limit Controls–Component

• UL GUIDE (MBPR8) Controls, Limit Certied for

Canada–Component per CSA Standard C22.2

• Apply a Manual Reset LWCO IQ Option Card,

p/n 102714-01 to be Fully compliant with CSD-1

requirements for water level controls in the US and

Canada

Instruction Sheet 102-360

Max Probe Ratings: Hot water only - 250 psi (17.6kg/

cm2) at 250°F (121°C)

Probe Sensitivity: 20K Ohms. Extended operation to

40K Ohms.

Thresholds: < 16% = Low Water Event

< 35% = Probe Cleaning may be

required

Operating Temperature: -4°F to 150°F (-20°C to 66°C)

Enclosure Rating: NEMA 1 for indoor use only

Dimensions: 4.5 in. x 1.5 in.

(ts onto IQ Option Panel)

Input Power: 1.7 VA @ 24 VAC supplied by a

Class 2 power source

Reset: Automatic or manual reset modes

Testing: Adjustment mode Test ()

pushbutton permits user testing

US Patents: 6,904,800, 7,243,540, and

7,317,993, Other Patents Pending

103591-01-04/11

5401507 Rev. D

Low Water Cutoff (LWCO) IQ Option Card

p/n 102711-01, 102714-01 for Hot Water Boilers

Summary of content (8 pages)

PAGE 1
Low Water Cutoff (LWCO) IQ Option Card p/n 102711-01, 102714-01 for Hot Water Boilers Instruction Sheet 102-360 APPLICATION The Low Water Cutoff (LWCO) IQ Option Cards are advanced, microprocessor based low water cutoffs for detecting the absence of water in a heating system. LWCO IQ Option Cards use patented signal processing to identify when the probe signal levels have decreased due to possible fouling. This advanced technologies permit extended operation for probe impedances up to 40K Ohms.
PAGE 2
INSTALLATION When Installing this Product: 1. Read these instructions carefully. Failure to follow them could damage the product or cause a hazardous condition. Save instructions for future use. 2. Check the ratings given in the instructions and on the product to make sure the product is suitable for your application. 3. Installer must be a trained, experienced service technician. 4. After installation is complete, check out product operation as provided in these instructions.
PAGE 3
INSTALLATION (continued) Probe Installation 1. Install the probe above the minimum safe water level, determined by the boiler manufacturer’s literature. This may be in a tapping on the boiler, in the boiler supply, or return piping. (See Fig. 3) 2. Make sure the probe extends into the boiler cavity or piping to make contact with the boiler water. 3. Make sure the exposed portion of the stainless steel probe is a minimum of 1/4” from any grounding surface inside the boiler to prevent the probe from shorting.
PAGE 4
INSTALLATION (continued) Testing 1. Do NOT fill the boiler with water. Set the thermostat to the lowest setting. Turn electric power on to the boiler. On initial start-up, the LWCO indicates a low water condition, which indicates proper function. The “Low Water” LED on the control unit illuminates RED and the Power LED illuminates GREEN. NOTE: The burner should not operate without water in the system. 2. Fill the boiler with water.
PAGE 5
USER INTERFACE (continued) Using IQ Option Panel Display The IQ Option Panel display along with Up , Down , and “I” keys are used to view and adjust IQ Option Card settings. Please note that these keys look similar to the keys on the IQ Boiler Control but are in a different orientation, and they perform different functions. Showing View Mode Options In view mode the user may look at (but not change) status and probe signal strength. To view option card information, press and release the “I” button.
PAGE 6
USER INTERFACE (continued) Entering Adjustment Mode In Adjustment Mode, the user can activate the test mode of the LWCO and reset a low water condition for Manual Reset models. To enter adjustment mode: 1. Press and hold the Up , Down , and “I” keys simultaneously for three (3) seconds while the display is in the LWCO card View Mode. While holding the buttons the display will change to an Adjustment mode label signifying to the user that installer mode has been entered.
PAGE 7
CLEANING, MAINTENANCE, AND REPLACEMENT • • Test the operation of the LWCO annually (or more frequently) by activating the Test feature. The “Low Water” LED should turn RED and the boiler should shut down. Inspect the probe every 5 years for scale build-up or coating. Clean all oils, fluxes, and scale from the probe using a clean rag. Inspect the probe sooner if the “Service” LED comes on. • Replace the control unit every 15 years.
PAGE 8
TROUBLSHOOTING Status Possible Cause Boiler / Control Action(s) No power to LWCO or OCP Make sure that the LWCO is plugged into the OCP correctly and that all wiring is correct. Make sure power to boiler is turned on. Low water level Air pocket at LWCO probe Turn off power to the boiler and slowly loosen, but do not remove the probe. Allow any air to escape until water seeps past the probe’s threads. Promptly re-lighten the probe and supply power to the boiler.