EWC Controls ULTRA-ZONE NCM-3z Technical Bulletin page 19

Thermostat
ZONE 3
W2 C O/B
W1
G R Y2 Y1
To Line Voltage
of HVAC
Indoor unit
DEDICATED
Power Supply
24vac
40va - 75va
"listed"
Transformer
Single Stage
Heat Pump
or
Air
Conditioner
Thermostat
ZONE 2
O/B
C
W1 W2
Y1 Y2 R G
Return Air
Filter
Return Air
from
All Zones
Refer to the NCM-3z Technical Bulletin for control wiring detail
3 ZONE SYSTEM
MODULATING
Zone 3 Damper
COM PO PC CONFIGURATION
1 4 6
PITOT TUBES
Air Handler
TXV
or
Coil
Furnace
Thermostat
ZONE 1
O/B
W1 C W2
Y1 Y2 R G
Supply Air
to
Zone Dampers
Zone 2 Damper
COM PO PC
1 4 6
Zone 1 Damper
COM PO PC
1 4 6
19