6
NOTE:
Install branch circuit disconnect of adequate size per NEC
to handle unit starting current. Locate disconnect within sight from
and readily accessible from unit, per Section 440--14 of NEC.
Route Ground and Power Wires
Remove access panel to gain access to unit wiring. Extend wires
from disconnect through power wiring hole provided and into unit
control box.
!
WARNING
ELECTRICAL SHOCK HAZARD
Failure to follow this warning could result in personal injury
or death.
The unit cabinet must have an uninterrupted or unbroken
ground to minimize personal injury if an electrical fault
should occur. The ground may consist of electrical wire or
metal conduit when installed in accordance with existing
electrical codes.
Connect Ground and Power Wires
Connect ground wire to ground connection in control box for
safety. Connect power wiring to contactor as shown in Fig. 5.
DISCONNECT
PER N. E. C. AND/OR
LOCAL CODES
TERMINAL
BLOCK
GROUND
LUG
FIELD GROUND
WIRING
FIELD POWER
WIRING
A14028
Fig. 5 -- Line Power Connections
Connect Evolution Control Wiring
Connect to Evolution connections. Only two wires (AB) or
(GN,YL) to Evolution capable indoor unit (furnace or fan coil) are
required.
Connecting C (WT) is recommended if wires are
available (see Fig. 6). This will reduce the chance of
communication issues.
Unused low voltage wires should be
bundled together and terminated with a wire nut at each end. The
end nearest the indoor coil should be connected to C terminal.
IMPORTANT
: This system requires the power supplied to the
outdoor unit, and the indoor unit, for the wall control to
communicate with the outdoor unit.
Connect Control Wiring-- Non--Communicating
4 wires are required when connecting 189BNV models to
non--communicating 2--stage thermostats. Use Fig. 7 For required
connections.
Unit is configured by factory for Evolution
communicating control. To wire unit for non--communicating
control, disconnect the green (GN) and yellow (YL) wires from
4--pin green communication plug and connect appropriate wires to
low voltage terminal block. Use wire nuts to attach thermostat
wire to LVCH harness.
General Information
Use 18--20 solid AWG color--coded, insulated (35
_
C minimum)
wire for low voltage control wires. All wiring must be NEC Class
2 and must be separated from incoming power leads.
Installations using greater than 200 feet of low voltage wiring
should consult the Evolution wall control manual for additional
guidelines regarding daisy chaining wiring method and terminating
resistors. Never route control wiring in parallel to high voltage
power wires when possible as electrical noise may transfer and
generate nuisance fault codes. Where low voltage control and high
voltage wires must cross paths, do so at perpendicular angles to
eliminate transferred noise.
If further communication issues exist, consider using shielded low
voltage wires and only connect shielding to C terminal at end
nearest indoor coil. Use furnace transformer, fan coil transformer,
or accessory transformer for control power requirement of system
accessories external to the OD unit. The outdoor unit has its own
transformer power.
Final Wiring Check
IMPORTANT:
Check factory wiring and field wire connections to
ensure terminations are secured properly. Check wire routing to
ensure wires are not in contact with tubing, sheet metal, etc.
D
C
B
A
Wall Control
HP or AC
OA
T
R
Y
O
W
C
HUM
C
Humidifier
24v
ac
Furnace or Fan Coil
’C’ connection optional
Sheild Cable
D not required
Unused Wires
WT
YL
GN
D
C
B
A
A150776
Fig. 6 -- Evolution Furnace or Fan Coil Wiring with
Communicating Variable Speed AC
