Volume 141 Catalog Page: 124, 1272-stage heat/2-stage cool or 2-stage heat/1-stage cool/HPDual power; battery or 24V hardwireFor gas, oil, electric heating/cooling & millivolt systems2 or 3-wire hydronic zone system compatibleTerminals: RC, RH, C, G, W/E, W2, Y, Y2, O/B/6, L6"W x 3-3/4"H, horizontal mountPossible replacement for MSH# 1302201F85U-22NP