Conventional - EWC Controls EWT-3102 User Manual

2
OUTDOOR/INDOOR
TEMPERATURE
SENSOR
S1 S2 C R RC

CONVENTIONAL

1. POWER SUPPLY. PROVIDE DISCONNECT MEANS AND OVERLOAD PROTECTION AS REQUIRED
2. OPTIONAL OUTDOOR OR INDOOR REMOTE SENSOR. AVAILABLE ON SELECT MODELS. WIRES MUST HAVE A CABLE
SEPARATE FROM THE THERMOSTAT CABLE
Fig. 17. Typical hookup of conventional multistage two-stage heating and two-stage
cooling in a two-transformer system (2H/2C, 2H/1C or1H/2C conventional).
EWT-3102 / EWT-3103 Touchscreen Programmable Thermostat
C
R
1
HEAT RELAY 2
COOL RELAY 2
HEAT RELAY 1
W W2 Y2 Y G
C 1
R
FAN RELAY
COOL RELAY 1
OPTIONAL
24VAC
COMMON
CONNECTION
MUST COME
FROM THE
COOLING
TRANSFORMER
30