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Manual 2100-346
Page 13
INSTALLATION INSTRUCTIONS – CMA-10A
Disconnect all power to unit. Remove control panel cover.
1. Screw compressor control module and terminal block
into control panel as shown in Figure 5.
2. Disconnect yellow low voltage wire form compressor
contactor and reconnect to terminal “Y” of the
compressor control module.
3. Connect the yellow wire from the compressor control
module to “Y” side of the compressors contactor coil.
This is the same terminal from which the wire was
removed in Step 2.
4. Connect the black wire form the compressor control
module to common “C” side of the compressor
contactor coil.
5. Connect a field supplied wire from “R” of the indoor
unit to “R” on the compressor control module.
6. Route the high (red) and low (blue) pressure switch
wires through the bushing in the bottom of the control
panel. Connect the low pressure switch wire to
terminals LPC of the compressor control module.
7.Remove service port caps on both the suction and
discharge lines. Install the high pressure switch on the
discharge line to the flare tee adapter that is brazed to
the controls. Install the low pressure switch on the
suction line. Check for pressure at the flare tee dill
valves after installation to insure that the dill valve in
the unit service port was depressed by the flare tee
connector. Check for leaks at the flare tee connectors.
Replace service port caps on the flare tee service ports
and tighten.
8. Adjust the compressor time delay relay to the desired
delay on break. Two minutes are recommended. This
TDR is variable form 30 seconds to 5 minutes.
9. Recheck wiring. Energize unit is first stage cooling.
Compressor should not start until the time delay has
expired. This will be 10% of the delay on break period.
Run the unit for at least 5 minutes. The unit should not
go into lockout.
10. Apply “This unit equipped with CMA-10A control
module.” label to the inside of the inner control panel
cover above the wiring diagram.
11. Replace all panels and covers. This completes
installation.
FIGURE 8
INSTALLATION INSTRUCTIONS FOR
CMA-10A DUAL PRESSURE CONTROL and
COMPRESSOR TIME DELAY RELAY
MIS-1303