Microtech 2300 - Unit Options; Waterside Economizer

25
OM 1364
WWW.DAIKINAPPLIED.COM
UNIT OPTIONS
Unit Options
Waterside Economizer
Application:
The MT2300 controls the waterside economizer. Upon a call
for economizer operation via TB1-3, HST on the MT2310 I/O
expansion board, for units without hot gas reheat or Y1 on the
MT2300 baseboard for units with hot gas reheat), the output
to the 3-way diverting valve and the fan motor are energized,
allowing water ow through the economizer coil and fan
operation.
Items Required
• Multi-stage thermostat or sensor
Unit Control Settings
• MT2310 I/O Expansion Module Jumper Settings:
— SW8 = ON (WSE Enable)
Figure 10: Unit with WSE (no HGR) thermostat wiring
diagram.
R
Y2
C
G
Y1
Unit
HST
I/O Exp Board
R 24VAC
Cool Stage 2
Y2
Cool Stage 3Y3
Common
C
FanG
Cool Stage 1Y1
Thermostat
Figure 11: Unit with WSE (no HGR) thermostat wiring
diagram.
R
C
G
Y1
Unit
HST
I/O Exp Board
R 24VAC
Cool Stage 2
Y2
Common
C
FanG
Cool Stage 1Y1
Thermostat