Jon Klima, Owner
360 Trout Lane, PO Box 23, Guffey, CO 80820
Phone: 719 479-2281,  Email:
In business for 37 years





The Webb Electronics Inc. (WEI) W-990 is a basic ON/OFF differential temperature controller from the early to mid 1980s. This controller came in several different models. Those offered here are two each of the model B and model ACC.


The model B has two 1 HP output relays. The K1 relay is for the ON/OFF delta T function. The K2 relay is available to drive a drain down valve with high and low limits specified.


The model ACC has three 1 HP output relays. The K1 relay is for the ON/OFF delta T function. The K2 and K3 relays are operated at the same time and are energized when the storage sensor reaches the high limit set point. Freeze protection is inoperable on this controller.


Two 30 K ohm sensors, one for the storage and one for the collector are required for the Webb-990 series of controllers.


The ON and OFF Delta Ts are easily adjusted as are Freeze and Over-Temperature protection. Click here for a copy of the Webb-990 Data and Application sheets


If you are looking to replace your defective Webb-990 controller or just want one as a backup, order one of these before this limited supply runs dry. Prices shown do not include postage.  Colorado sales will be charged the appropriate sales tax. Yes, I accept credit card payments through PayPal, checks, and money orders.  For questions or to place an order, send me an email (see top of this page) stating what you are interested in along with your zip code.  I'll check the postage to your zip code and send you a return email with the total cost.



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This page was last changed on 5-5-2015