Fig 2. Powering an HS-EMS300 Thermostat with a Stand-alone Transformer
Fig. 1 Wiring Diagram for One Heating/Cooling System with One HS-EMS300 Thermostat
Warning! Do not remove the internal jumper (shunt).
Thermistor Temperature Sensor
HS-EMS300
W1
Y1
G
R
24V
24V(c)
CLK1
CLK2
RS2
RS1
RS+V
X1
X2
R/24V shunt. Remove if
thermostat power is not
supplied by equipment.
Free Light / LED1
Free Light / LED2
W2
LED2
LED1
DIP SW5
DIP SW6
Display
Y2
Escort5580TC/
VPM5580TC
X
1
X
2
RS
+V
X
2
X
1
RS
+V
RS1
RS2
CLK1
CLK2
24V(c)
24V
R
G
W1
Y1
24V(c)
24V
G
W1
Y1
Heat Stage #1
Cool Stage #1
Fan
Power - Hot
Power - Common
Heating/Cooling
System
HS-EMS300
(Backplate)
LED1
LED2
W2
Y2
Cool Stage #2
Y2
W2
Heat Stage #2
Output Terminal Functions
LED1................. Free light for status or function indication.
LED2................. Free light for status or function indication.
CLK1................. Use with dry contact relay for alternate set points.
CLK2................. Use with dry contact relay for alternate set points.
RS2.................... To Outdoor/Indoor remote sensors.
RS1.................... To Outdoor/Indoor remote sensors.
RS+V................. To Outdoor/Indoor remote sensors and
to Escort5580TC/VPM5580TC.
X2...................... To Escort5580TC/VPM5580TC.
X1...................... To Escort5580TC/VPM5580TC.
Y2 ...................... Energizes on a call for second stage cooling.
W1 ..................... Energizes on a call for first stage heating.
Y1 ...................... Energizes on a call for first stage cooling.
G ........................ Fan is energized with a call for heating or cooling or by press-
ing the fan button.
R ........................ Independent switching voltage.
24V .................... 24 V
AC
Hot from equipment transformer.
24V(
C
) ............... 24 V
AC
Common from equipment transformer.
W2 ..................... Energizes on a call for second stage heating.
Warning! Remove the internal jumper (shunt) before connecting the stand-alone transformer.
Escort5580TC/
VPM5580TC
X
1
X
2
RS
+V
X
2
X
1
RS
+V
RS1
RS2
CLK1
CLK2
24V(c)
24V
R
G
W1
Y1
24V(c)
24V
G
W1
Y1
Heat Stage #1
Cool Stage #1
Fan
Heating/Cooling
System
HS-EMS300
(Backplate)
LED1
LED2
W2
Y2
Cool Stage #2
Y2
W2
Heat Stage #2
Line Voltage
Common
Hot
24V
AC
Transformer
