Microtech 2300 - Humidistat Controlled Dehumidification

29
OM 1364
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DEHUMIDIFICATION
Humidistat Controlled
Dehumidication
Application
Similar to the simplied dehumidication option, this option also
maximizes latent capacity by using a humidistat and thermostat.
This option allows the room thermostat to control sensible
cooling, while the independent humidistat controls room humidity
levels
Items Required
• Humidistat combined with a...
• Model SD, SN, ST, SL = 3 stage thermostat
• Model SC, SM, SS, SH, SR = 2 stage thermostat
• Return air sensor
NOTE: This feature is not available if unit is controlled by wall
sensor
Unit Control Settings
• MT2310 I/O Expansion Module Jumper Settings:
— SW7 = ON (HGR Enabled)
— SW8 = OFF (WSE Disabled)
Wiring
• Thermostat/Sensor combination:
• Field supplied sensor
Figure 18: Unit thermostat and humidistat combination -
humidistat controlled dehumidication wiring diagram
R
Y2
C
G
Y1
Unit
HST
I/O Exp Board
R 24VAC
Cool Stage 2
Y2
Common
C
FanG
Cool Stage 1Y1
Thermostat
R 24VAC
Dehumid
DH
Humidistat
Figure 19: Unit thermostat and humidistat combination -
humidistat controlled dehumidication wiring diagram
R
C
G
Y1
Unit
HST
I/O Exp Board
R 24VAC
Common
C
FanG
Cool Stage 1Y1
Thermostat
R 24VAC
Dehumid
DH
Humidistat
Figure 20: SmartSource MT2300 controller & I/O expansion
module to eld supplied return air temperature sensor and
humidistat wiring
SmartSource Board MT2300 BoardMT2300 Board
Terminal Block Label H4-3 H4-4 TB1-3 TB1-6
Description
Sensor
Common
Return Air
Temperature
Dehumidification
Input
Dehumidification
Output
Dehumidification
Source Voltage
Humidistat
Source Voltage
(24VAC)
Terminal Label GND RAT HST R
Typical Wiring
Terminal Label X
XXX
Description
DC Signal
Common
Room Temp
Sensor, 10K Ohm
ATP Curve Z or
equivalent
Sensor Field Supplied Room Temperature Sensor
Operation
• A call for heating or cooling has a higher priority than a call
for dehumidication. Dehumidication is allowed only if the
room temperature is satised and the return air temperature
is 68°F or greater.
• If the controller detects the need for heating or cooling, or
if the Humidistat is no longer calling for dehumidication,
dehumidication mode will be suspended.
• Dehumidication mode will enable the 3-way hot gas
bypass valve, sending hot superheated refrigerant to the
hot gas reheat coil while running the compressor at full load
and the fan at dehumidication speed.
NOTICE
See Fan Performance section in catalog for unit size specic fan speeds.