Daikin MicroTech MT2300 - Thermostat Inputs

OPERATION
MICROTECH 2300 UNIT CONTROLLERDAIKIN APPLIED
14
Figure 9: Terminal “E” - grounded for remote shutdown
E - Emer Shtdn Input
Ground
U - Unoccupied
Ground
LED
LED
FM
FM
SP
SP
RM
RM
GND
GND
LED
LED
FM
FM
SP
SP
RM
RM
GND
GND
TB3
TB3
E
E
E
E
U
U
U
U
LEDLED FMFM SPSP RMRM GNDGND LEDLED FMFM SPSP RMRM GNDGND
TB3TB3
EE EE
UU UU
When in remote shutdown (E terminal grounded), control inputs
have no a󰀨ect upon unit operation. No faults or modes have
higher priority than remote shutdown. See Table 8 on page 20.
When the unit is in remote shutdown mode, the following occurs:
1. The compressor de-energizes (if enabled).
2. The fan de-energizes (if enabled).
3. Fault terminal (ALM) will remain de-energized because
emergency shutdown is a “mode.”
When the E terminal is no longer grounded the unit will
automatically return to normal operation.
NOTICE
The remote shutdown input (E) will suspend unit operation. Disconnect power
when servicing the unit/controller.
Thermostat Inputs
Inputs (G, Y1, Y2, W1, W2, W3, and W4)
For units with both waterside economizer and hot gas reheat, the
only thermostat inputs used during unoccupied operation are Y3,
and W2/W3, which when energized will activate Cooling Mode or
Heating Mode respectively. Inputs G, Y1 and W1 have no e󰀨ect
during unoccupied mode.
For all other units, the only thermostat inputs used during
unoccupied operation are Y3, and W2/W3/W4, which when
energized will activate Cooling Mode or Heating Mode
respectively. Inputs G, Y1 and W1 have no e󰀨ect during
unoccupied mode.
Waterside Economizer/ Dehumidication
The humidistat input (TB1-3, HST) on the I/O expansion board,
when energized from the thermostat, enables Waterside
Economizer or Dehumidication operation on units congured for
one of the functions or the other.
On units congured for both Waterside Economizer and
Dehumidication, the humidistat input (TB1-3, HST) on the I/O
expansion board, enables dehumidication and the Y1 input
on the MT2300 baseboard (TB1-1), when energized from the
thermostat, enables Waterside Economizer operation and the W4
input (TB1-5) on the MT2310 I/O expansion module will act as a
Y3 third stage of cooling.