015 – WIRING HONEYWELL T87 MERCURY FREE THERMOSTAT WITH CARLIN PRIMARY CONTROLS

It has come to our attention from technicians in the field that they have been having issues using Honeywell T87 Mercury Free thermostats with Carlin Primary controls. Through testing in our lab, we have found the Honeywell T87 Mercury Free thermostats are not backward compatible with all primary controls already existing in the field. This [...]

This test procedure consists of three tests. The first test should be the ignitor spark test. The second test is a secondary coil resistance test. The third test consists of an input current test. The following is a step by step procedure to perform these tests. It is important that all three of these tests [...]

  Direct Vent Issues: With the introduction of direct vent equipment, a variety of installation and service issues are being confronted. Primary among these are cross contamination and cold combustion air. On 12/26/02, we issued a Technical Service Bulletin addressing the problem of cross contamination. This is most often seen with concentric terminations (one penetration [...]

The increased use of direct vent appliances in the past five years has brought with it a variety of challenges/problems for the heating industry. A direct vent appliance uses neither a chimney nor a power venter. Flue gases are vented directly through the sidewall of the building using the burner to provide the necessary draft. [...]

In a technical bulletin published by another burner manufacturer an explanation of the wiring colors for pre/post purge cad cell controls was given. That bulletin stated that the limit wire on the control was "commonly red" and the L1 power was "commonly black". I feel it is IMPERATIVE that I correct that statement to avoid [...]