Condensate Overflow Switch; Alarm Output; Humidifier Control - Mars Comfort-Aire Century VCD24 SA Series Installation Manual

Connection method C:
Cooling and Fixed-speed Type Only System
Wiring Diagram:
NOTICE
Suggestion: It is suggested that you use was
a thermostat from Honeywell, series of
non-programmabled thermostats, including
the TH5220D.
Optional function wiring:
Installation and Operation Manual - VCDxxSA

Condensate overflow switch:

The unit will accommodate a remote condensate
overflow switch. To enable, remove jumper J1,
and connect the installer provided condensate
overflow device to CN5 per below. When an
overflow condition is present, the device should
open connection signaling the unit to turn o
the system.
The fault warning:

Alarm output:

An alarm output (CN33) can be utilized if actions
are required when a fault is present. This is a
passive outlet port, so you will need to input a
voltage signal. The relay is normally-open for
normal operation, and closed when a fault
condition is active.

Humidifier control:

To connect a humidifier, utilize the passive signal
"WORK" output (CN23) port as well as the G and
C wires on the controller, and wire the humidistat
and humidifier per above wiring diagram. When
the fan is running, the CN23 relay will be closed,
which will allow power to the humidifier when
the humidistat is below humidity setpoint. If the
thermostat or zone controller has an HUM
interface, connect the humidifier directly to the
HUM and C ports.
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