Microtech 2300 - Electric Heat Controls; Supplemental Electric Heat Control; Boilerless Heat Control

ELECTRIC HEAT CONTROLS
MICROTECH 2300 UNIT CONTROLLERDAIKIN APPLIED
22
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.