Lennox EL23XCV Series Manual page 31

When the Operation Mode jumper is installed in the "Com-
fort Mode" the suction pressure setpoint is 125 psig.
Unit Operation
EL23XCV Unit Operation with a S30/S40 Communicat-
ing Thermostat
When the EL23XCV unit is installed with an S30/S40 com-
municating thermostat and communicating indoor unit,
the unit capacity will be controlled in the variable capacity
mode throughout the range of capacity from minimum ca-
pacity to maximum capacity based upon thermostat de-
mand. The indoor air volume will be controlled to match
cooling capacity throughout the capacity range.
EL23XCV Unit Operation with a Conventional 24VAC
Non-Communicating 2-Stage Thermostat
When the EL23XCV unit is installed with a conventional
24VAC non-communicating 2-stage thermostat, a Y1 first
stage cooling demand will initiate cooling operation and
first stage indoor blower operation. The compressor will
be controlled in the variable capacity mode by varying the
compressor capacity to obtain the target suction pressure
set point. The Y2 second stage cooling demand will initi-
ate second stage blower operation. Increased air volume
will increase the load on the indoor coil and increase the
suction pressure. The EL23XCV compressor capacity will
continue to be controlled based upon the suction pressure.
The unit capacity will be controlled in the variable capac-
ity mode throughout the range of capacity from minimum
capacity to maximum capacity. If the Y2 demand remains
after 20 minutes, the EL23XCV control will begin to ramp
up the compressor capacity until maximum capacity is
achieved. The EL23XCV unit will cycle off once the ther-
mostat demand is satisfied.
EL23XCV Unit Operation with a Conventional 24VAC
Non-Communicating Single-Stage Thermostat
When the EL23XCV unit is installed with a conventional
24VAC non-communicating single-stage thermostat, a Y1
first stage cooling demand will initiate cooling operation
and cooling indoor blower operation. In single stage ther-
mostat applications, a jumper must be installed between
Y1 and Y2 on the EL23XCV outdoor control. The com-
pressor will be controlled in the variable capacity mode
by varying the compressor capacity to obtain the target
suction pressure set point. If the cooling demand remains
after 20 minutes, the EL23XCV control will begin to ramp
up the compressor capacity until maximum capacity is
achieved. The EL23XCV unit will cycle off once the ther-
mostat demand is satisfied.
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