Microtech 2300 - Fan Speed Selection

FAN SPEED SELECTION
MICROTECH 2300 UNIT CONTROLLERDAIKIN APPLIED
24
Fan Speed Selection
The SW1-SW4 conguration switches on the MT2310 I/O
expansion module allow CFM settings to be eld adjustable with
some fan options. Fan speed control optimizes unit fan speed
based on thermostat/room sensor inputs.
The variable speed fan conguration switches allow for
manually setting an optimal fan speed specic to the application
requirements. The four primary speed proles are selected using
SW1 and SW2. SW3 reduces the heating and cooling speeds
by 15%, and the SW4 switch selects the fan speed when in Fan
Only mode (subject to the operational rules below).
Fan Only SW4
OFF = 20%
ON = Cool Stage 1 speed (Does not a󰀨ect heat or cool mode fan
speeds)
General Fan Operation Rules
50% minimum whenever heating or cooling
100% for Auxiliary Electric Heat
Hydronic heating/cooling = Heat Stage 1/Cool Stage 1
DEHUM = Cool Stage 1 minus 10% (50% minimum)
Table 10: I/O expansion module Conguration Switch
Fan
Speed
Row
Switch
#1
Switch
#2
Fan
Only
1
Cool
Stage
1
Cool
Stage
2
Heat
Stage
1
Heat
Stage
2
1 OFF OFF 20% 80% 100% 80% 100%
2 ON OFF 20% 70% 90% 70% 90%
3 OFF ON 20% 60% 80% 60% 80%
4 ON ON 20% 50% 70% 50% 70%
1
See “Fan Only SW4” section above.
NOTE: Refer to Figure 3 for conguration switch location.
BACnet Communication Module
On units with an optional BACnet communication module, fan
speeds can be set through network communications to 1%
resolution of duty cycle. For hydronic or compressorized modes,
the range is 50-100%, and for fan only mode, the range is
10-100%. When enabled, the network fan speed settings will
override the local conguration switches. When the MT2310
status LED interval is yellow instead of O󰀨, this indicates that the
network is overriding the fan speed settings.