IM 1285-4 • MICROTECH III 14 www.DaikinApplied.com
HP1 and HP2 relays are wired in parallel to the HP1 and HP2
switches. When either of the high pressure switches open,
the HP1/HP2 relays are de-energized and the 115 VAC circuit
opens at DI5/DI6 on the MT III MCB. Figure 19 shows the
wiring for High Pressure Switch 1 (HP1) and High Pressure
Switch 2 (HP2).
The HP3 and HP4 relays are wired in parallel to the HP1 and
HP2 switches. When either of the high pressure switches
open, the HP3/HP4 relays are de-energized and 24 VAC is
removed from X3/X4 on the MT III MCB. Figure 20 shows the
wiring for High Pressure Switch 3 (HP3) and High Pressure
Switch 4 (HP4).
See schematic in Appendix B for information on
wiring High Pressure Switches and relays for units
with more than four compressors. Reference the I/O
charts found in IM 919 for wiring terminal information.
For compressor number one, the LP1 and FP1 switches are
wired in series with a 1.5kΩ resistor. For compressor number
two, the LP2 and FP2 switches are wired in series with a 1kΩ
resistor. The X2 input on the MT III MCB will read a resistance
value input depending on which switch opens. Figure 19 shows
the wiring for Low Pressure Switch 1 (LP1), Low Pressure
Switch 2 (LP2), Frost Protection Switch 1 (FP1) and Frost
Protection Switch 2 (FP2).
For compressor number three, the LP3 and FP3 are wired in
series and into X1 on Expansion Module C. For compressor
four, the LP4 and FP4 are wired in series into X2 on Expansion
Module C. Figure 20 shows the wiring for the Low Pressure
Switch 3 (LP3), Low Pressure Switch 4 (LP4), Frost Protection
Switch 3 (FS3), and Frost Protection Switch 4 (FS4).
See schematic in Appendix B for information on
wiring High Pressure Switches and relays for units
with more than four compressors. Reference the I/O
charts found in IM 919 for wiring terminal information.
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