iWorx® MPU2
12
505-009, Effective: June 30, 2015
© 2015 Taco Electronic Solutions, Inc.
Modulated Cooling (CLGM)
The modulated cooling output can be set to 0-10 V max through the control logic. Connect the positive wire from the
cooling output to CLGM (T34) and the other wire to COM (T33). See preceding figures for details.
Bypass Damper (BYP)
The bypass damper output can be set to 0-10
VDC max through the control logic. Connect the positive wire from the
damper actuator to BYP (T32) and the other wire to the adjacent common (T33). See preceding figures for details.
Cooling Stage 1 or Cooling Floating Point Valve Open (C1)
The cooling stage output must be connected to a 24 VAC pilot relay if the load is greater than 1 Amp. See preceding
figures for details. If the load is less than 1 Amp, connect cooling stage 1 to C1 (31) and TC12 (30). For control of a
floating point valve, connect C1 as the valve open signal.
Cooling Stage 2 or Cooling Floating Point Valve Close (C2)
The cooling stage output must be connected to a 24 VAC pilot relay if the load is greater than 1 Amp. See preceding
figures for details. If the load is less than 1 Amp, connect cooling stage 2 to C2 (29) and TC12 (30). For control of a
floating point valve, connect C2 as the valve close signal.
Cooling Stage 3 (C3)
The cooling stage output must be connected to a 24 VAC pilot relay if the load is greater than 1 Amp. See preceding
figures for details. If the load is less than 1 Amp, connect to C3 (T28) and TC34 (T27).
Cooling Stage 4 (C4)
The cooling stage output must be connected to a 24 VAC pilot relay if the load is greater than 1 Amp. See preceding
figures for details. If the load is less than 1 Amp, connect to C4 (T26) and TC34 (T27).
Heating Stage 1 or Heating Floating Point Valve Open (H1)
The heating stage output must be connected to a 24 VAC pilot relay if the load is greater than 1 Amp. See preceding
figures for details. If the load is less than 1 Amp, connect heating stage 1 to H1 (T25) and TC56 (24). For control of a
floating point heating valve, connect H1 (T25) as the valve open signal. TC56 (T24) is the common.
Heating Stage 2 or Heating Floating Point Valve Close (H2)
The heating stage output must be connected to a 24 VAC pilot relay if the load is greater than 1 Amp. See preceding
figures for details. If the load is less than 1 Amp, connect heating stage 2 to H1 (T23) and TC56 (T24). For control of a
floating point heating valve, connect H2 (T23) as the valve close signal. TC56 (T24) is the common.
Fan (FAN)
The fan output must be connected to a 24
VAC pilot relay if the load is greater than 1 Amp. See preceding figures for
details. If the load is less than 1 Amp, connect the fan to FAN (T22) and TC78 (T21).
Digital Economizer (ECD)
The digital economizer output must be connected to a 24 VAC pilot relay if the load is greater than 1 Amp. See preced-
ing figures for details. If the load is less than 1 Amp, connect the economizer to ECD (T20) and TC78 (T21).
Other Connections
Network (LON)
Network wiring must be twisted pair. One network wire must be connected to terminal NETA (T1) and the other network
wire must be connected to terminal NETB (T2). Polarity is not an issue since an FTT-10A network is used for commu-
nications.
