Daikin MicroTech III Operation And Maintenance Manual

OM 1239 23 www.DaikinApplied.com
Unit options
There are two dehumidication modes of operation:
1. Hot Gas Reheat Dehumidication with Temperature
Control.
2. Hot Gas Reheat Dehumidication.
Hot gas reheat with temperature
control application
Hot Gas Reheat with Temperature Control uses a
combination of 2-stage thermostat and humidistat to
optimize unit capacity and for maximum latent capacity
while decreasing room humidity levels.
■ 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. 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 both 3-way hot gas
bypass valve, sending hot superheated refrigerant to the
hot gas reheat coils while running the compressor at full
load and the fan.
Hot gas reheat dehumidication
only
■ Operation:
In applications where only dehumidication is needed,
the humidistat can be wired to TB1-1 on the Microtech
III unit controller, allowing the WSHP unit to operate in
dehumidication mode only. The unit will only respond to
a call for dehumidication.
■ Items required:
• Humidistat
■ Unit control settings:
• I/O Expansion Module Jumper Settings:
• JP5=Shorted
• JP6=Open
■ Wiring:
Figure 10: Unit and humidistat-dehumidification only
wiring diagram
Unit Base Board TB2 Thermostat
R RC 24VAC
RH 24VAC
C C 24VAC Common
G G Fan
Y1 Y Cool Stage #1
Y2 Y2 Cool Stage #2
W1 W1 Heat Stage #1
W2 W2 Heat Stage #2
O W3 Heat Stage #3
A L Alarm Input
I/O Expansion Module TB1
Humidistat
1 D/A Dehumidication
2 W4 Heat Stage #4
■ Items required:
• Unit with Hot Gas Reheat option
• Humidistat and a Thermostat OR Digitally
Adjustable Wall Sensor
■ Unit control settings:
• I/O Expansion Module Jumper Settings:
• JP5 = Shorted
• JP6 = Open
■ Wiring:
• Thermostat (Part No. 910121750)
Sensor (Part No. 910129095 or 910129096)
Combination:
Figure 11: Thermostat and humidistat combination for hot
gas reheat dehumidification wiring diagram
Unit Thermostat
R R 24VAC
C C Common
G G Fan
Y1 Y1 Cool Stage 1
Y2 Y2 Cool Stage 2
Humidistat
TB-1 R 24VAC
DH Dehumid
• Digitally adjustable room temperature sensor (Part
No. 910121754)
MICroteCh III unIt Controller

Daikin MicroTech III Specifications

General

Brand	Daikin
Model	MicroTech III
Category	Controller
Language	English