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ELECTRICAL – Circuit Sizing
and Wire Routing
In the U.S.A., wiring must conform with current local codes
and the current National Electric Code (NEC). In Canada,
wiring must conform with current local codes and the cur-
rent Canadian Electrical Code (CEC).
Refer to the furnace or air handler installation instructions
for additional wiring application diagrams and refer to unit
nameplate for minimum circuit ampacity and maximum
overcurrent protection size.
24VAC TRANSFORMER
Use the transformer provided with the furnace or air han-
dler for low-voltage control power (24VAC - 40 VA mini-
mum)
Thermostat Control and Low Voltage
Control Wiring
EL18XPV Thermostat Control Options
The EL18XPV variable capacity units provide two thermo-
stat control options to provide application and installation
exibility.
iComfort S30 Communicating Thermostat Control
The E18XPV variable capacity unit may be installed as
a fully communicating iComfort system consisting of
iComfort S30 Ultra Smart Communicating Thermostat, an
iComfort enabled indoor unit and the EL18XPV variable
capacity outdoor unit wired with (4) iComfort communi-
cation wires (R, I+, I- and C) connected to the EL18XPV
Outdoor Unitary Control.
The EL18XPV variable capacity unit when wired as a fully
communicating iComfort system will take full advantage of
the advanced diagnostics and control, Wi-Fi accessibility
and system operation parameters. Refer to the EL18XPV
eld wiring diagram for an iComfort S30 communicating
thermostat.
Conventional 24VAC Non-Communicating Thermo-
stat Control
The EL18XPV variable capacity unit may be installed us-
ing a conventional 24VAC non-communicating two stage
heat pump or single stage heat pump thermostat.
NOTE – The conventional 24VAC non-communicating
thermostat must have a compressor minimum on time of
three minutes to prevent compressor short cycling. The
Lennox M30, ComfortSense 7500, ComfortSense 3000
and many other commercially available electronic thermo-
stats provide this feature.
The EL18XPV unit will provide full variable capacity oper-
ation when installed with a conventional 24VAC non-com-
municating two stage heat pump or single stage heat pump
thermostat. The EL18XPV outdoor control has advanced
control algorithms using the EL18XPV suction pressure
sensor to provide true variable capacity operation.
When utilizing a two-stage conventional 24VAC non-com-
municating heat pump thermostat, six wires are required
to control the outdoor unit (R, C, W1, O, Y1 and Y2). Re-
fer to the EL18XPV eld wiring diagram for a conventional
24VAC non-communicating 2-stage heat pump thermostat.
When utilizing a single conventional 24VAC non-commu-
nicating heat pump thermostat, ve wires are required to
control the outdoor unit (R, C, W1, O, and Y1) and Y1 is
jumpered to Y2 in the outdoor unit. Note that the published
performance data is based upon the use of a two-stage
thermostat. Refer to the EL18XPV eld wiring diagram for
a conventional 24VAC non-communicating single-stage
thermostat.
EL18XPV Low Voltage Control Wiring Connections
The EL18XPV variable capacity units are provided with (2)
RAST 6-Pin connections in the installation instruction bag
for connecting the eld low voltage control wiring to the
EL18XPV harnesses in the low voltage control make-up
box. One RAST 6-pin connector is labeled with terminals
TST, DF, R, I+, I- and C. The second RAST 6-pin connec-
tor is labeled with terminals DS, O, Y1, Y2, L and W.
WARNING
Electric Shock Hazard. Can cause injury or
death. Unit must be properly grounded in
accordance with national and local codes.
Line voltage is present at all components
when unit is not in operation on units with
single-pole contactors. Disconnect all remote
electric power supplies before opening
access panel. Unit may have multiple power
supplies.
WARNING
Fire Hazard. Use of aluminum wire with this product may
result in a re, causing property damage, severe injury
or death. Use copper wire only with this product.
WARNING
Failure to use properly sized wiring and circuit breaker
may result in property damage. Size wiring and circuit
breaker(s) per Product Specications bulletin (EHB) and
unit rating plate.
WARNING
ELECTROSTATIC
DISCHARGE
(ESD)
Precautions and
Procedures
Electrostatic discharge can aect
electronic components. Take care
during unit installation and service to
protect the unit’s electronic controls.
Precautions will help to avoid control
exposure to electrostatic discharge
by putting the unit, the control and the
technician at the same electrostatic
potential. Touch hand and all tools
on an unpainted unit surface before
performing any service procedure to
neutralize electrostatic charge.
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