use the Normally Open (N

Efficient Operation: Delivers 3

preventing dangerous flue gas leaks and maintaining high-efficiency operation

use 22 AWG or larger twisted-pair wire and keep the run as short as possible to minimize resistance-induced temperature offsets

It is technically identical to the Honeywell 4074ELR/U

Johnson Controls T-2100-205 Thermometer 30067439-890 use the Normally Open (NJohnson Controls T 2100 205 Dial Thermometer, 40 to 240 Degree Temperature Scale, "B" Bulb Element, Flush Panel Mount, 15' Capillary Length, Stainless Steel Case, Vapor Filled Copper Element, "B" Style Elements Require a Minimum Insertion Length of 9 1 2"