150
NOTES FOR FIG 36 AND 37:
1. The smart controller must be configured based on the type of compressor it is con-
trolling. See Section 6.4 for configuration details.
2. The compressor is loaded when the unloader solenoid coil is de-energized and
unloaded when the solenoid coil is energized.
3. The power for the compressor contactor, unloader coils, and liquid injection solenoid
may be either 115 VAC or 230 VAC. All components must be of the same voltage. Fus-
ing for this should be a 2 amp-120V or 1 amp-240V time delay fuse. Alternately, the
components may be fused individually with ½ amp fuses.
4. The compressor COMP contactor will open when any of the following conditions exist:
loss of 24 VAC supply power, discharge temperature sensor failure, discharge tem-
perature >295 F, or the input demand voltage is > 8.0 VDC. The COMP contactor
should be wired into the compressor’s control power circuit if the Carlyle discharge
temperature sensor is being used to control compressor discharge temperature. This
will ensure the compressor will shut down if discharge temperature exceeds 295 F or
the sensor fails. The triac output for Coil 1, Coil 2, and the LIV will open, disabling the
unloader valves and liquid injection valve if the COMP contactor is opened.
5. The smart controller cylinder head fan lead wires may be either single phase 230 VAC
or 460 VAC. The cylinder head fan relay will open at a loss of 24 VAC supply power,
discharge temperature sensor failure, or input demand voltage > 8.0 VDC. Upon a
compressor discharge temperature trip (> 295 F) the cylinder head fan relay will stay
closed. Typically the compressor’s cylinder head fan will shut down when the com-
pressor is off, but with the smart controller the fan will still operate to reduce discharge
temperature below 230 F so the compressor will auto restart following a 5-minute time
delay.
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