Installation
www.DaikinApplied.com
9
IM 1285-4 • MICROTECH III
Wire Raceways
The white wire raceways are designed to ensure an organized
control panel. Mount the wire raceways as shown in the
diagram in
Appendix H on page 41
. Fasten wire raceways to
the control panel with screws.
Installing Remote HMI Display
Install the Remote HMI Display above the control panel in
place of the old MT I display. Mount the Remote HMI Display
by using the magnets found on the back of the display. See
IM
1005
for details on wiring.
Installing the T1 Transformer
The MT III control panel requires two different transformers.
T1 transforms 480V to 115V and T2 transforms 480V to 24V.
The T2 transformer already exists within the self-contained
unit’s control panel. Mount the T1 transformer below the T2
transformer by screwing it into the control panel.
Installing PC5, PC7, DHL Tubing and
DSP Transducer
Install new tubing for the pressure switches, if necessary, and
confirm that it matches the diagram in
Figure 10
. If the unit
requires a VFD, a Duct Static Pressure transducer (DSP) will
need to be installed. The DSP is installed by mounting it on the
top DIN rail. See
Figure 11
.
Figure 10: New DSP Tubing Diagram
Figure 11: Duct Static Pressure (DSP) Transducer
Installing Freezestat
A non-averaging type freezestat (FS1) is used to protect
hydronic coils from subfreezing temperatures. The control is
mounted on the entering face of the economizer coil. Upon
sensing a temperature above specification, the unit shuts
down, opens the hydronic control valves, and sends an alarm
indication via the MicroTech III controller. The freezestat has a
field-adjustable set point range of 35°F to 45°F. To change the
set point, turn the adjustment screw until the pointer is opposite
the desired cutout point. The adjustment screw is accessible at
the bottom of the freezestat switch or at the top when the cover
is removed.
Installing Actuators for Waterside
Economizer
A unit with Waterside Economizer Application requires two
valves controlled by separate actuators. One valve is for the
economizer and the other valve is the water regulator/bypass.
Each of these valves has their own actuator, but function
oppositely from each other. When the economizer valve opens,
the water regulator/bypass valve will close and vice versa.
Each actuator will need to be mounted with its polarity wired for
direct or reverse acting function. A 0 VDC signal will fully close
the economizer valve and the water regulator/bypass valve will
be fully open. A 10 VDC signal will fully open the economizer
valve and the water regulator/bypass valve will be fully closed.
See
Figure 12
.
NOTE:
There may be several different types of valves
depending on the age of the unit. Field modification
may be required before installing the actuator.
Figure 12: Actuators for Waterside Economizer
TO SUPPLY
FAN PLENUM
HI
LO
HI
LO
HI
LO
PC7
PC5
DHL
TO ENTERING
AIR SIDE OF
THE FILTERS
TO LEAVING
AIR SIDE OF
THE FILTERS
