Manual 7960-847B
Page
3 of 8
FIGURE 2
MIS-3880
REINSTALL CAP
REMOVE CAP AND INSTALL
PRESSURE TRANSDUCER
TEE TO SERVICE PORT.
BOX
PLUG WITH
WIRES TO CONTROL
LIQUID LINE
RE-INSTALL CAP
page 6. Disconnect the black fan wire running
from the T2 terminal of the compressor contactor.
Install terminal block (as shown in Figure 5) and
reconnect the black fan wire to one side of the
terminal block. Run the black/red wire from LAC
to the terminal block so that it is connected to the
fan motor wire. Run the black wire from LAC to the
T2 terminal of the compressor contactor. Run the
black/white wire from LAC to the C terminal on the
24V transformer. Run the red/white wire from LAC
to the R (hot) terminal on the transformer. Run
the yellow wire from LAC to the T3 terminal of the
compressor contactor.
8. Secure wires running on the outdoor section of the
unit using the supplied nylon wire ties as shown
in Figure 1). Be sure that there is no way that the
wires can come in contact with the fan blades or
any sharp edges.
9. Check wiring and control knob settings. See Figure
5 (page 6) and Figure 6 (page 7) for wiring and
suggested setpoints.
10. Find the purple wire not connected to anything that
is tucked in the cable duct (see Figure 5). Pull it
out and connect it to the LAC terminal block on
the terminal that is separate from the LAC control
wires. Connect the end of the outdoor temperature
switch that has the insulated quick connect to the
terminal block beside the purple wire. Connect the
other end of the outdoor temperature switch to the
Y terminal on the phase monitor. (Refer to Figure 7
on page 8 or the unit wiring diagram).
11. Connect the freeze protect thermostat wires in line
with the “Y” input signal to the compressor control
module (CCM). Refer to the unit wiring diagram.
For 1-phase units, connect the end with the 1/4”
quick connect to Y terminal on the CCM, and the
other end with the 1/4” tab to the yellow/white wire
coming from the low voltage terminal strip.
For 3-phase units, connect the wire end with
the 1/4” quick connect to “Y out” on the phase
monitor, and the other end with the 1/4” tab to the
yellow/black wire going to the CCM.
12. Apply “This unit is equipped with CMA-38 control
module” label to the inside of the inner control
panel cover above the wiring diagrams.
11/16" WRENCH
3/4" WRENCH
1/2" WRENCH
