Microtech 2300 - Dehumidification Only; Analog Humidity Sensor Input

DEHUMIDIFICATION
MICROTECH 2300 UNIT CONTROLLERDAIKIN APPLIED
30
Dehumidication Only
Application
In applications where only dehumidication is needed, the
humidistat can be wired to HST on the MT2300 unit controller,
allowing the WSHP unit to operate in dehumidication mode only.
The unit will only respond to a call for dehumidication whenever
the return air temperature is 68°F or greater.
Items Required
• Humidistat
• Return air sensor
Unit Control Settings
• I/O Expansion Module Jumper Settings:
— SW7 = ON (HGR Enabled)
— SW8 = OFF (WSE Disabled)
Wiring
Figure 21: Unit and humidistat-dehumidication only wiring
diagram
R
C
G
Unit Humidistat
R 24VAC
Dehumid
DH
HST
I/O Exp Board
Operation
Upon a call for dehumidication, the unit will run in Cool Stage 1
compressor capacity and Dehumidication fan speed.
Example
A 2-stage model SD, unit size 026, wired for Dehumidication
Only:
• Upon a call for dehumidication from the humidistat, HST
on the unit control board will be energized, allowing the
compressor to operate at full load and the fan to operate at
dehumidication CFM.
NOTICE
See Fan Performance section in catalog for unit size specic fan speeds.
Analog Humidity Sensor Input
• Any of the dehumidication options described can also be
used with an optional 0-10VDC relative humidity sensor.
• An analog humidity sensor is intended to be an option for
units with BACnet communications to allow the relative
humidity value to be viewed and the dehumidication
setpoint to be adjusted via network communications.
• When an analog humidity sensor is used, and optional
Humidity Senor Failure alarm can be congured to indicate
if the sensor reading has become unreliable. The Sensor
Failure Alarm feature is disabled by default, and can be
activated via network communications.
• While an analog humidity sensor can be used on units
without network communications, there will be no way to the
relative humidity or adjust the relative humidity setpoint, so
a humidistat is recommended.
Figure 22: Analog Humidity Sensor Wiring
V+ 24VAC
R
GND
0-10VDC
Relative
Humidity
VoutW4
Ground
GN
W3
RH
Unit
Analog
Humidity Sensor
HST
I/O Exp Board