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5 – Outdoor Unitary Control - Jumpers and Terminals
RAST TERMINALS FOR
THERMOSTAT WIRING
CONNECTION
Outdoor Control 7 Segment Display and
Push Button
Information concerning the outdoor control 7-segment dis-
play and push button operations are available on the unit
access panel.
Alarms
Alarm information is provided on the unit access panel.
Charge Mode Jumper
To initiate the EL18XCV Charge Mode function, install the
jumper across the two Charge Mode Pins (CHRG MODE)
on the outdoor control. The Charge Mode can be used
when charging the system with refrigerant, checking the
refrigerant charge, pumping down the system and per-
forming other service procedures that requires outdoor
unit operation at 100% capacity.
EL18XCV Charge Mode Operation with a S30 Commu-
nicating Thermostat
Installing a jumper on the Charge Mode Pins will initiate
compressor operation and outdoor fan motor at 100% ca-
pacity and will provide a signal to the indoor unit to initiate
indoor blower operation at the maximum cooling air vol-
ume. To exit the charge mode, remove the Charge Mode
Jumper. The Charge Mode has a maximum time of 60
minutes and will automatically exit the charge mode after
60 minutes is the charge mode jumper is left in place.
PUSH BUTTON
EL18XCV Charge Mode Operation with a Convention-
al 24VAC Non-Communicating Thermostat
On applications with a conventional 24VAC non-commu-
nicating thermostat, the charge mode jumper must be in-
stalled on the Charge Mode Pins after providing a Y1 cool-
ing demand to the EL18XCV to initiate the Charge Mode.
A cooling blower demand must also be provided to initi-
ate blower operation on the cooling speed on the indoor
unit. The compressor and outdoor fan motor will operate
at 100% capacity. To exit the charging mode, remove the
Charge Mode Jumper and remove the Y1 Cooling de-
mand and indoor blower demand. The Charge Mode has
a maximum time of 60 minutes and will automatically exit
the charge mode after 60 minutes is the charge mode
jumper is left in place.
Operation Mode Jumper
The Operation Mode Jumper is only used on applications
installed with a conventional 24VAC Non-communicating
thermostat. In applications with a conventional 24VAC
non-communicating thermostat, the compressor capacity
is controlled to maintain the target suction pressure set-
point. The Operation Mode Jumper has three selectable
cooling modes. The three modes are Efficiency (Jumper
installed on Pins 1 & 2), Normal Mode (Jumper installed
on Pins 2 & 3) and Comfort Mode (Jumper Removed).
The factory default position is the Efficiency Mode. The
Efficiency mode has a variable suction pressure setpoint
that will vary with the outdoor temperature; as the outdoor
temperature increases the suction pressure setpoint will
decrease. When the Operation Mode jumper is installed
in the "Normal Mode" the suction pressure setpoint is 135
psig.
Page 17
7 SEGMENT
DISPLAY
CHARGE
MODE JUMPER
(CHRG MODE)
CHARGE MODE AND
OPERATION MODE
JUMPER DETAIL
OPERATION
MODE
JUMPER
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