Daikin MicroTech II Installation And Maintenance

14 Daikin IM 696-4
Field Wiring
Units with Modulating Heat
The VAV Box Output should be used to switch the VAV boxes
between heating and cooling control. While the unit is in
Startup, Recirc, or any heating operating state (UnocHtg,
MWU, or Heating), the VAV Box Output is in the OFF (or
heat) position (field-installed pilot relay de-energized)
switching the VAV boxes into heating operation.
VAV units have a “post heat” control feature that
forces the
discharge air
volume to a minimum before closing the VAV
Box Output when the unit leaves Recirc or any other heating
operating state. “Post heat” operation prevents excessive duct
static pressure that could otherwise occur when the zone
thermostats regain VAV box control.
1
When the unit is not in Startup, Recirc, or any other heating
operating state, the VAV Box Output is in the ON (or cool)
position (field-supplied pilot relay energized) switching the
boxes to cooling control.
Staged Cooling Outputs
Model RDS and RAH rooftop air handlers can be ordered with
factory-installed evaporator coils and the capability to control
up to
eight stages of field-supplied cooling equipment. The
MicroTech II outputs designated for these applications are
GCB1-BO1 through GCB1-BO8. These outputs are wired to
terminal block TB4 in the main control panel for connection to
the field supplied condensing unit. Refer to the as-built wiring
schematics for the unit or to Figure 25 on page 56.
As the controller increases coo
ling capacity, it
sequentially
energizes the relays in ascending order. As the controller
decreases cooling capacity, it sequentially de-energizes the
relays in descending order. Refer also to Table 19 on page 31.
Field Analog Input Signals
Zone Temperature Sensor Packages
Table 5 lists the two zone (space) temperature sensor packages
that are available for use with applied rooftop units equipped
with a MicroTech II controller. A zone tem
perature sensor
(ZNT1) is optional for all rooftop units except for the 100%
outdoor air CAV-ZTC (SCC) unit in which case one is
required. In all unit configurations, however, a zone
temperature sensor is required to take advantage of any of the
following standard controller features:
• Unoccu
pied heating or cooling
• Pre-occupancy purge
• Discharge air reset based on space temperature (DAC units
onl
y)
• Timed t
enant override
• Remote set point adjustment (CAV-ZTC units only)
Daikin
part no.
Tenant
override
switch
Remote set
point
adjustment
For use with
DAC
CAV-ZTC
(SCC)
111048101 Yes No X X
111048102 Yes Yes X
Zone Sensor without Remote Set Point Adjustment
The standard MicroTech II room temperature sensor package
that does not include set point adjustment can be used with any
applied rooftop MicroTech II control configuration. It includes
a tenant override button.
This zone sensor must be field installed and field-wired to the
unit using twisted
pair, shielded cable (Belden 8761 or
equivalent). Figure 8 shows the required wiring termination
points.
Table 5: MicroTech II zone temperature sensors

Daikin MicroTech II Specifications

General

Brand	Daikin
Model	MicroTech II
Category	Controller
Language	English