18
BAS-SVX065E-EN
Figure 3. 2–position ventilation economizer (Trane EX units only)
VAC
24
XFRM
VAC
24
VAC
24
BI
1
BI
2
BI
3
LINK
IMC
+
24
VDC
BI
4
AO1
BI
5
AO2
UI
1
UI
2
AI
3
AI
2
AI
1
AI
4
AI
5
P
1
P
2
C
NC
NO
BO3
C
NC
NO
BO2
C
NC
NO
BO1
RELAYS
ADDRESS
TRIAC SUPPLY
TRIACS
A
BO9
BO8
BO7
BO6
BO5
BO4
A
B
B
TX
RX
LINK
IMC
SERVICE
SERVICE TOOL
CONNECT AC POWER TO THE TRAIC SUPPLY TO POWER THE TRIACS
BO1 BO2 BO3
BO4 BO5 BO6 BO7 BO8 BO9
1 2
3
4
56
7
8
9
IMC
1
IMC
1
3
4
56
7
1 2
3
4
56
7
8
9
8
9
TRIAC SUPPLY
TRIACS
A
BO9
BO8
BO7
BO6
BO5
BO4
A
B
B
CONNECT AC POWER TO THE TRAIC SUPPLY TO POWER THE TRIACS
Single-Tier
Terminal
Connections
Ground
To 24 Vac
Supply
Compressor
Command
Waterside
Economizer
Fan
Start/Stop
(EX/DX Units)
Hot Gas
Reheat/
Elec Heat
Reversing
Valve
Isolation
Valve
Outdoor
Air Damper
NOTES:
• BO5 is used for compressor stage 2 on DX units and BO4 is for compressor stage 1 on DX units.
• When Hot Gas Reheat and Electric Heat are present on the same WSHP, Electric Heat will be moved to BO1 on XM32.