Auxiliary Contacts - Carrier 40MBAB Installation Instructions Manual

40MBAB: Installation Instructions

AUXILIARY CONTACTS

Main Board
Control Board
Fig. 58 — Auxiliary Contacts
WORK terminal port CN23 – DRY CONTACT – OUTPUT
• The WORK port is linked to the unit's indoor blower
• When the indoor blower is off, the contact is open
• When the indoor blower is running, the contact is closed
• There is no voltage from CN23, power is provided from the external
control system and not from the unit
• The contacts are rated at 250VAC and 10 AMP maximum
• If an active 24V signal output is required, G and C ports (thermostat
connections) may be used instead
Fig. 59 —WORK Terminal Port CN23
ALARM terminal port CN33 – NORMALLY OPEN DRY
CONTACT (OUTPUT)
• Allows the terminal port to connect to an external ALARM interface or
annunciator
• There is no voltage from CN33, power is provided from the ALARM
system and not from the unit
• The contacts are rated at 250VAC and 10 AMP maximum
Manufacturer reserves the right to change, at any time, specifications and designs without notice and without obligations.
Alarm
interface
Liquid level
switch
interface
Indoor and
UVLED
outdoor unit
communication
interface
A220837
• When the unit experiences a problem, the contact closes, and the
ALARM is triggered. When the unit experiences a problem, the relay
closes, and the ALARM is triggered.
Fig. 60 —ALARM Terminal Port CN33
WATER LEVEL switch terminal port CN5 – SWITCH
INPUT
• To enable this switch, jumper J1 must be removed
• A field supplied float switch can be directly connected to CN5
• CLOSED contacts = normal
• OPEN contacts = overflow
• When an overflow condition occurs, a signal is sent to the system to
turn it off: Alarm EE is displayed.
Fig. 61 —WATER LEVEL Terminal Port CN5
UV LED terminal port CN43 – OUTPUT 24VAC:
• The UV LED port is linked to the unit's fan
• When the fan is running, the relay is closed and there is an output of
24VAC through the contacts that can be used to power a compatible
UV LED LIGHT
Fig. 62 —UV LED Terminal Port CN43
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