Roanoke Times
Copyright (c) 1995, Landmark Communications, Inc.
DATE: TUESDAY, November 8, 1994 TAG: 9411080084
SECTION: EXTRA PAGE: 6 EDITION: METRO
SOURCE: DAVID BUTLER
DATELINE: LENGTH: Medium
A: Thermostatic valves have an automatic shutdown feature that will interrupt the flow in case the hot or cold supply fails. Some models have mechanical limits that require deliberate action from the user in order to exceed a preset temperature. Since they're totally mechanical, anyone with light plumbing experience should be able to handle the installation.
If you prefer a high-tech solution, at least two companies produce microprocessor-based bath and shower valves. You simply select the desired temperature setting and wait a few moments for the water temperature to stabilize. One model has a ready light; the other shows you the actual water temperature as it rises.
Electronic mixing valves are extremely accurate - within one-half degree of the desired temperature. Behind the scenes, a microprocessor checks the water several times per second, making adjustments as needed. Although installation is somewhat more involved than with a mechanical valve, all components are powered by a plug-in transformer, avoiding the need for an electrician.
A more serious reason to consider an automatic valve is to protect against scald injuries, especially if you have young children. Alternatively, you can install an inexpensive in-line anti-scald valve. If the water gets too hot, the valve quickly closes. Simply press the reset button when you're ready to restore the water. Both shower and faucet versions are available.
Water conservation efforts as well as a growing interest in automation have stimulated other types of automated plumbing fixtures. Most people are familiar with motion-activated faucets. The water turns on as you move your hands under the spout and turns off when you're done. Decorative models are available that can easily be installed in an existing home. In most cases, the temperature can only be adjusted under the counter.
One unique valve allows you to turn on your shower from a remote light switch. When you're ready to take a shower, just flip the switch! Using a power line carrier remote control, you can turn on your shower as you stumble out of bed each morning. Since the valve only turns the water on and off, you must make adjustments from the manual mixing valve inside the shower. Low voltage and line voltage versions are available.
Perhaps the ultimate in automated plumbing is a whole-house system that provides push-button control over every shower and faucet in the house. Small membrane panels at each fixture give you control over both temperature and flow rate. Since the mixing valves are located at the water heater, only one distribution line is needed per fixture.
To receive a list of companies that manufacture automated plumbing fixtures and systems, please send $1.50 and a self-addressed envelope to David Butler F-434, Department TWN, 14713 Pleasant Hill Road, Charlotte, N.C. 28278-7927. The list includes toll-free phone numbers and a summary of each company's products. You'll also receive information on anti-scald valves for showers and faucets.
TechTalk: Many new computer monitors include a feature called Display Power Management System (DPMS). After a certain period of inactivity, a DPMS-equipped monitor will automatically switch to progressively lower stages of power consumption: standby, suspend and (nearly) off. Although turning down the brightness or running a screen-saver utility will prolong CRT life, neither has much effect on power consumption.
by CNB