Systems Controls & Instruments ETN-24-PROG Series Owner's Manual page 5

3.2. Connections for 2 Heat - 2 Cool - HC22
Rc - Phase for Cool
Rh - Phase for Heat
C - Common
W1 - Heat 1
Y2 - Compressor/Cool 2
W2 - Heat 2
Y1 - Compressor/Cool 1
G - Fan
T-T - External sensor option - see # 4.3
3.3. Connections for Heat Pump 1 stage - HP21
Rc - Phase for Cool
Rh - Phase for Heat
C - Common
W1 - Heat Pump (to change active cool or heat - See # 5)
Y2 - Not in use
W2 - Emergency heat (EMH)
Y1 - Compressor
G - Fan
T-T - External sensor option - see # 4.3
3.4. Connections for Heat Pump 2 stage - HP32
Rc - Phase for Cool
Rh - Phase for Heat
C - Common
W1 - Heat Pump (to change active cool or heat - See # 5)
Y2 - Compressor 2
W2 - Emergency heat (EMH)
Y1 - Compressor 1
G - Fan
T-T - External sensor option - see # 4.3
THE EMERGENCY HEAT (EMH) IN HEAT PUMP TYPES IS NOT SELECTABLE -
IT WILL SWITCH ON BY REQUEST OF TEMPERATURE. (second stage)
File: ETN-24-PROG book - page letter Rev: 1 - 3 -
Pipersville, PA 18947 USA
Phone: 215-766 1487 Fax: 215-766 1493
Email: info@scillc.com - www.scillc.com
Date: 24-06-2002