Daikin MicroTech MT2300 - Optional Features; Heating Source Selection; Hydronic Heat; Two Compressor Option

15
OM 1364-1
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OPTIONAL fEATURES
Optional Features
Heating Source Selection
Heating source selection provides a method to disable the
compressor operation when in the heating mode.
Baseboard SW7 Conguration Switch
operation
• OFF: Enables compressor operation in the heating mode.
• ON: Disables compressor operation in the heating mode.
When compressor operation is disabled in the heating mode and
electric heat is available:
• Auxiliary Heat Stage 1: output energizes upon activation of
the “Heating – Stage 1”.
• Auxiliary Heat Stage 2: output energizes upon activation of
the “Heating – Stage 4”, except on units congured for both
Waterside Economizer and Dehumidication.
When compressor operation is disabled in the heating mode
electric and hydronic heat is unavailable:
• The unit will not provide any form of heating.
Hydronic Heat
General
The hydronic heating option provides control of a two position
valve connected to a hot water coil when loop water temperature
is warm enough for hydronic heating.
• Loop water temperature is sensed by a factory installed
entering water temperature sensor located on the inlet
water line.
• Hydronic heat circuit shall be independent and substitute
the use of the compressor driven refrigeration circuit.
Operation
The Auxiliary Heat Stage 1 (H6-8) output on the MT2310 I/O
expansion board is used to open the hydronic heating valve.
• Hydronic heating setpoint allowed range is 70°F to 158°F,
with a 90°F default value.
• When Entering Water Temperature (EWT) rises above the
hydronic heating on setpoint:
• Compressor will be locked out of heating (compressor
minimum on timer applies).
• If hydronic heating is required: the pump request output is
activated; the “wait for ow” timer is canceled because the
EWT is adequate for hydronic heating; the hydronic heating
output shall energize; and the fan will turn on 30 seconds
after the hydronic heating output has been energized.
• The fan speed signal is based on the highest active heating
stage (1 or 2). Variable speed fan operates at the Hydronic
Heat PWM speed.
Two Compressor Option
Compressor Availability Selection
On two compressor units, Compressor Availability conguration
switch allows you to select which compressors are available for
operation. If a compressor needs to be disabled in order to be
service, this conguration switch can be used in conjunction with
the Lead Compressor Selection switch to disable one or both
compressors.
Baseboard SW7/8 Conguration Switch operation
• SW7 and SW8 OFF: Both compressors are available for
operation
• SW7 ON and SW8 OFF: Lead compressor available and
the lag compressor is disabled
• SW7 OFF and SW8 ON: Both compressors are disabled.
When both compressors operation is disabled in the heating
mode and electric heat is available:
• Auxiliary Heat Stage 1: output energizes upon activation of
the “Heating – Stage 1”.
• Auxiliary Heat Stage 2: output energizes upon activation of
the “Heating - Stage 4’
When both compressors operation is disabled in the cooling
mode, waterside economizer cooling will be used if available.
Lead Compressor Selection
On two compressor units, Lead Compressor conguration switch
allows you to select which compressor will come on rst.
Expansion Module SW10 Conguration Switch
operation
• OFF: Compressor 1 is the lead compressor and will come
on rst.
• ON: Compressor 2 is the lead compressor and will come on
rst.
Dehumidication
• Simplied Dehumidication
• Hot Gas Reheat Smart Dehumidication
• Humidistat Controlled Dehumidication
• Dehumidication Only
Simplied Dehumidication
Application
By utilizing a basic thermostat and conguring the MT2300 unit
controller for this mode of operation, the WSHP will provide
maximum latent capacity by optimizing blower fan speeds
resulting in decreased humidity levels in the conditioned space.