Daikin MicroTech MT2300 - Electric Heat Controls; Unit Status; Remote Shutdown

13
OM 1364-1
WWW.DAIKINAPPLIED.COM
OPERATION
resume normal mechanical cooling mode with stage 1 of the
thermostat or network setpoint now starting the compressor.
NOTICE
To prevent compressor cycling and all compressors from starting up together
after loss of power, the required minimum on/off time default is 300 seconds
plus the random restart of 0 to 60 seconds. This may cause the compressor
time delay to be longer than indicated above.
NOTICE
For a unit with both water side economizer and hot gas reheat, Y3 from the
thermostat will be wired to W4 on the MT2310 I/O expansion module.
Electric Heat Controls
W3
The W3 (TB1-4) terminal in the MT2310 I/O expansion module
enables the rst stage of electric heat.
W4
The W4 (TB1-5) terminal on the MT2310 I/O expansion module
enables the second stage of electric heat except on units
congured for both Waterside Economizer and Dehumidication.
Supplemental Electric Heat Control
The supplemental electric heating option provides additional
stages of heating that can be used in conjunction with
compressor heating, or exclusively if the compressor is not
available for heating.
General Rules
• Supplemental electric heater and the compressor may
operate simultaneously.
• Minimum Compressor ON and OFF timers do not apply to
electric heat control.
Operation
Fan Main Output: will turn ON and the Fan PWM signal will be at
“Auxiliary Heat” duty cycle when:
• Any auxiliary heat output is energized.
• For 30 xed seconds after all auxiliary heat outputs have
been de-activated.
Electric Heat Outputs: are allowed to energize when either
condition exists:
• Inter-Stage ON timer must be expired.
• Compressor is not available for heating.
When Compressor is Available
• Auxiliary Heat Stage 1 output energizes upon activation of
Heating – Stage 3.
• Auxiliary Heat Stage 2 output energizes upon activation
of Heating – Stage 4, except on units congured for both
Waterside Economizer and Dehumidication.
When Compressor is Unavailable
• Auxiliary Heat Stage 1 output energizes upon activation of
“Heating – Stage 1.
• Auxiliary Heat Stage 2 output energizes upon activation
of Heating – Stage 4, except on units congured for both
Waterside Economizer and Dehumidication.
Boilerless Heat Control
• Turns on the heater when the entering water temperature
is less than setpoint (default is 55°F), the temperature set
point is adjustable through the network.
• For geothermal applications the heater turns on when the
entering water temperature is less than setpoint (default
28°F).
NOTICE
In both cases, the compressor is shut down.
Unit Status
Unoccupied Operation – Stand Alone
Thermostat Control
The board will be in unoccupied mode if the unoccupied terminal
(U) is grounded.
LED Activity Type Color Description
5 Flash Mode Green Unoccupied Mode Active
Figure 8: Terminal “U” - Grounded for Unoccupied
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
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
Remote Shutdown
LED Activity Type Color Description
Rapid Flash Mode Green Emergency Shutdown
When the TB3-E terminal is grounded, the MT2300 unit controller
enters remote shutdown mode. Remote shutdown is provided so
that when properly connected to a building automation system,
remote switch, etc., the E terminal can be used to shut down the
water source heat pump.