IM 1285-4 • MICROTECH III 16 www.DaikinApplied.com
Wiring
Wire Freezestat
The Freezestat (FS1) is a temperature-based switch that is
designed to open at low temperatures in order to protect the
coil. The Freezestat should be wired in series with a 1 kΩ
resistor. When the Freezestat opens the circuit between X5
and M on the MT III MCB, the unit will read an open signal and
alarm. See
Figure 21
.
Wiring Water Flow Sensor
The water flow sensor is powered by 24 VAC from transformer
T2. Relay R11 closes a set of NO contacts on X5 on Expansion
Module C when the water flow sensor detects water flow. See
Figure 21
.
NOTE:
If there is no Water Flow Sensor on the unit, a jumper
needs to be wired between X5 and M on the EXP-A
to avoid nuisance alarms.
Wiring Waterside Economizer and Water
Regulator/Bypass Valves
The Waterside Economizer valve actuator (ACT3) and Water
Regulator/Bypass valve actuator (ACT4) will be supplied
24+ VAC and 24 VAC Common from the respective terminal
blocks. Land the 2-10 VDC input signal T9-X7 on the MT III
and to terminal 3 on the actuators. These will also need to be
grounded. See
Figure 22
for proper wiring.
Figure 21: Expansion Module C
Figure 22: Water Regulator and Bypass Valves
