Daikin MicroTech II Installation And Maintenance

Daikin IM 696-4 17
Field Wiring
Field Valve Actuator Feedback
When the MicroTech II controller is interfaced with a field
supplied ho
t water, steam, or chilled water valve actuator, a
position feedback signal can be field-wired from the actuator
and input to the MCB. This signal is not required for control
purposes but is required for 0–100% capacity indication on the
keypad or via a network interface. If the signal is not supplied,
the valve is controlled properly, but associated capacity
parameter will always indicate 0%.
Field wire the external feedback sign
al t
o the unit using a
twisted pair, shielded cable (Belden 8761 or equivalent). Cable
with 22 AWG conductors is sufficient.
CAUTION
Field Hot Water or Steam Valve Actuator. When interfaced
with a field-supplied hot water or steam valve actuator, a valve
feedback signal in the form of a resistance that varies from 0 to
500 ohms or 0–5 VDC as the actuator strokes from 0 to 100%
open can be wired to terminals 91 and 92 on the field terminal
block (TB2). These terminals are factory-wired to analog input
MCB-AI10. Refer to the unit wiring diagrams or Figure 16 on
page 38 (DAC units) or Figure 18 on page 42 (SCC units) for
wiring termination details.
If the field-supplied feedback signal is 0–500 ohms, the
fo
llowing
procedures are required:
1 Set the analog input jumper associated with MCB-AI10 to
the resistance (1-RTD) position.
2 Set the analog input DIP switch associated with MCB-AI10
to the OFF (or T) position.
3 Set the Feedback= parameter in the Heating Setup menu on
the unit keypad/display to “2 Wire.”
4 After the three items above are set, run the unit through the
Calibrate Mode.
If the field supplied feedback signal is 0–5 VDC, the following
procedures are required:
1 Set the analog input jumper associated with MCB-AI10 to
the no jumper (NJ-VDC) position.
2 Set the analog input DIP switch associated with MCB-AI10
to the ON (or V) position.
3 Set the Feedback= parameter in the Heating Setup menu on
the unit keypad/display to “3 Wire.”
4 After the three items above are set, run the unit through the
Calibrate Mode.
Field Chilled Water Valve Actuator. When interfaced with a
field-supplied chilled water valve actuator, a valve feedback
signal in the form of a resistance that varies from 0 to
500 ohms or 0–5 VDC as the actuator strokes from 0 to 100%
open
can be wired to
terminals 8 and 9 on the terminal block
(TB5). These terminals are factory-wired to analog input
MCB-AI11. Refer to the unit wiring diagrams for wiring
termination details.
If the field-supplied feedback signal is 0–500 ohms, the
following procedures are required:
1 Set the analog input jumper associated with MCB-AI1 to
the resistance (1-RTD) position.
2 Set the analog input dip-switch associated with MCB-AI11
to the OFF (or T) position.
3 Set the Feedback= parameter in the Chilled Water Setup
menu on the unit keypad/display to “2 Wire.”
4 After the three items above are set, run the unit through the
Calibrate Mode.
If the field supplied feedback signal is 0–5 V
DC, the following
procedures are required:
1 Set the analog input jumper associated with MCB-AI11 to
the no jumper (NJ-VDC) position.
2 Set the analog input dip-switch associated with MCB-AI11
to the ON (or V) position.
3 Set the Feedback= parameter in the Chilled Water Setup
menu on the unit keypad/display to “3 Wire.”
4 After the three items above are set, run the unit through the
Calibrate Mode.
Do not install this cable in the same conduit as power wiring.
Such installation can cause unit malfunction.

Daikin MicroTech II Specifications

General

Brand	Daikin
Model	MicroTech II
Category	Controller
Language	English