24
G e o t h e r m a l H e a t i n g a n d C o o l i n g
Trilogy
®
Variable (VE) Series IOM - 60Hz HFC-410A
C r e a t e d : 4 O c t o b e r, 2 0 1 9
Electrical - Low Voltage Wiring
Low Voltage Field Wiring
Accessory Connections
The EXM controller includes accessory relays. Each relay
includes a normally open (NO) and a normally closed (NC)
contact. Accessory relays may be confi gured to operate as
shown in Table 8.
Thermostat
Connection
Electric Heat
Connection
Accessory Relay
Connections
K7 Relay
Acc2
Relay
Acc1
Relay
Test Button To Speed Up
Time Delays
S-1 Dipswitches
Fault and
Status LEDs
Figure 20: Trilogy Low Voltage Field Wiring
Table 8: Accessory Relay Confi guration
S1 DIP
Switch
Accessory
Relay
On
Off
S1-1
N/A
Modbus Master
Modbus Slave
S1-2
N/A
Diagnostics Master
Diagnostics Slave
S1-3
ACC1 (K3)
Tracks Blower
Tracks Compressor
S1-4
ACC2 (K4)
Tracks Blower
Tracks Compressor
S1-5
K7
Tracks Blower
Tracks Compressor
Figure 21: EXM Layout and Connections
Jumpers Positioned
for ACC1 and ACC2
to be Dry Contacts
Jumpers Positioned
for ACC1 and ACC2 to
output 24 VAC
Com 1
Com 2
Com 1
Com 2
