Carrier 40QSM009DS Service Manual page 13

2.3.1.4 Reserved Remote On-off and Central Control Ports

Reserved remote on-off ports and central control ports, can connect the cable of an on-off
controller or a central controller to realize remote on-off control function or group control function.
2.3.1.5 Built-in Drain Pump (Optional):
 Built-in drain pump can lift the water to 750mm upmost. It's convenient to install drainage piping
under most space condition.
Remote on-off ports
Motor
Blower Housing
Ventilated Panel
Central control ports
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