Emerson XM678D, Operation And Installation Manual

Page: 13 / 76

Important Note Wiring Diagram and Connections • 5
6 Wiring Diagram
and Connections
6.1. Important Note
The XM device is supplied with a disconnectable
terminal block to connect cables with a cross-section
of up to 1.6 mm
2
for all low voltage connections:
RS485, LAN, probes, digital inputs, and keyboard.
Other inputs, power supply and relay connections are
provided with a screw terminal block or Faston
connection (5.0 mm). Heat-resistant cables have to be
used. Before connecting the cables, verify that the
power supply complies with the controller’s
requirements. Separate the probe cables from the
power supply cables, outputs and power connections.
Do not exceed the maximum current allowed on each
relay. In case of heavier loads, use a suitable external
relay. Maximum current allowed for all loads is 16A .
The probes should be mounted with the bulb upwards
to prevent damages due to casual liquid infiltration. It
is recommended to place the thermostat probe away
from air streams to measure the average room
temperature correctly. Place the defrost termination
probe among the evaporator fans in the coldest place
(where most ice is formed) and far from heaters or
from the warmest place during defrost to prevent
premature defrost termination.
6.2. Wiring Guidelines
6.3. XM678D Wiring and Connections
DEVICE TYPE RETAIL SOLUTIONS
ANALOG TEMP
SENSOR
DIGITAL INPUT BELDEN #8761 #22-2
SHIELDED
Retail Solutions
P/N 035-0002
RS-485 NETWORK BELDEN #8761 #22-2
SHIELDED
Retail Solutions
P/N 035-0002
BELDEN #8641 #24-2
SHIELDED
Retail Solutions
P/N 135-8641
PRESSURE
TRANSDUCER
**BELDEN #8771 #22-3
SHIELDED
Retail Solutions
P/N 135-8771
**#8771 for alternate 600v
rated wire use BELDEN #8618
16 AWG
*STEPPER VALVE
Use valve manufacturer’s
harness with a maximum length
not to exceed 30 feet (10
meters).
POWER LOADS
AND VALVE
Allow a maximum wire size of
14 AWG (2 mm
2
).
Table 6-1 - Wiring Guidelines
Figure 6-1 - XM678D Wiring and Connections