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Manual 2100-346
Page 14
INSTALLATION INSTRUCTIONS – CMA-13A
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 from 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 compressor’s contactor coil.
This is the same terminal from which the wire was
removed in Step 2.
4. Connect the black wire from 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.
Connect the high pressure switch wires to terminals
HPC of the compressor control module.
7. Disconnect the high voltage outdoor motor lead and
reconnect to the terminal block installed in Step 1.
8. Route the LAC (black) wires up through the busing in
the bottom of the control panel. Connect one wire to
the terminal block and the other to “T2” of the
contactor. This will be the same terminal from which
the high voltage outdoor motor lead was removed in
Step 7.
9. Remove service port caps on both the suction and
discharge lines. Install the high pressure switch and
the low ambient control on the discharge line with 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.
10. Adjust the compressor time delay relay to the desired
delay on break. Two minutes are recommended. This
TDR is variable from 30 seconds to 5 minutes.
11. Recheck wiring. Energize unit in 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. The condenser fan motor should not
run until the discharge pressure has exceeded 300 PSI.
Should the discharge pressure fall below 200 PSI while
running the condenser fan motor will de-energize until
the head pressure builds to 300 PSI.
12. Apply “This unit equipped with CMA-13A control
module.” label to the inside of the inner control panel
cover above the wiring diagram.
13. Replace all panels and covers. This completes
installation.
FIGURE 9
INSTALLATION INSTRUCTIONS FOR
CMA-13A DUAL PRESSURE CONTROL, LOW AMBIENT FAN CYCLING CONTROL
and COMPRESSOR TIME DELAY RELAY
MIS-1304