
6 | TERMINAL BLOCK CONNECTIONS DDC Field Installation Guide
DDC Field Installation Guide8 733 904 851 Revised 05-13 Subject to change without prior notice
TERMINAL BLOCK CONNECTIONS
Refer to the wiring diagram in Figure #6 for
detailed instructions on wiring the various
components applicable to your units. The table in
Figure #5 provides a general guide for connecting
all labeled wires:
Figure # 5 Wiring Chart
1. Inside the electrical box, connect the power
and signal wires to the corresponding terminal
block locations per Figure #6, and based on the
options for your particular unit.
2. For the DATS and LWTS connections, install
the provided thermistors at their respective
locations per the chart/table in Figure #5.
3. Route the thermistor wires into the electrical
box, and connect the terminated ends (female)
of the thermistor wires to the terminated ends
(male) of the corresponding DATS or LWTS
leads from the DDC wire harness.
Label Qty Wire
Color
Description Destination
C1Blue Common E-Box, Terminal Block
O1Black Reversing Valve E-Box, Terminal Block
Y/Y1 1 Brown Stage 1 Cooling E-Box, Terminal Block
Y2/E 1 Purple
(short)
(Y2) Stage 2/Economizer, (E) Electric Heat E-Box, Terminal Block
R1Yellow 24 VAC E-Box, Terminal Block
G1Orange Blower E-Box, Terminal Block
H/W 1 Red
(short)
(H) Hot Gas Reheat, (W) Electric Heat E-Box, Terminal Block
DATS 2 Purple
(long)
Discharge Air Temperature Sensor Blower Housing (Air Handler Section)
LWTS 2 White Leaving Water Temperature Sensor Heat Exchanger Leaving Water Pipe
ALR-OUT 1 White UPM Alarm Out E-Box, UPM Board
ALR-
COM
1 Red
(long)
UPM Alarm Common E-Box, UPM Board
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