EST Install and User Guide
07 2022
6 of 29
ECOER INC.
Manufacturer reserves the right to change specifications or designs without notice.
Terminal Description
C Common
RH / RC
24 VAC power (RH and RC are already connected each other - Must Dial to S)
O Mode changeover
W (E) First stage of auxiliary heat or emergency heat for heat pump systems
G Fan for standard mode
Y1 First stage of cooling or first stage heat pump
DH (G2) Fan for dry mode
W2 Second stage of auxiliary heat for heat pump systems
Y2 Second stage of cooling or second stage heat pump
Wiring Terminals in Mounting System
C RH RC O
W
(E)
G Y1
DH
(G2)
W2 Y2
RESERVED
S: Single transformer
D: Double transformers
S D
up
Connection to
touch screen
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