Microtech 2300 - Start-Up; Operation; Thermostat Inputs

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OM 1364
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START-UP
Start-Up
The MT2300 unit controller’s valve or pump request terminal [IV/
PR (H6)] is an output signal to external devices to allow water
ow as required by the heat pump. The IV/PR (H6) terminal
follows compressor operation inversely if connected to the
normally open terminal and simultaneously when connected to
the normally closed terminal. The IV/PR (H6) terminal can be
used as a signal to an external pump or valve to enable ow to
the unit. The compressor start is delayed for 60 seconds after the
IV/PR (H6) output is energized.
Table 9: IV/PR(H6) terminal and compressor operation
IV/PR(H6) Compressor On Compressor O󰀨
Normally Open 24 VAC 0 VAC
Normally Closed 0 VAC 24 VAC
Operation
Thermostat Inputs
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.