40MBAB: Installation Instructions
Manufacturer reserves the right to change, at any time, specifications and designs without notice and without obligations.
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AUXILIARY CONTACTS
Main Board
A220837
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
• 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
Indoor and
outdoor unit
communication
interface
Alarm
interface
Liquid level
switch
interface
UVLED
Control Board
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