outdoor temperatures are expected to be below 32 F
(0° C), sufficient inhibited ethylene glycol or other suit-
able corrosion-inhibited antifreeze should be added to
the chiller water circuit to prevent possible freeze-up.
5. Check tightness of all electrical connections.
6. Oil should be visible in the compressor sight glass. See
Fig. 18. An acceptable oil level in the compressor is from
1
⁄
8
to
3
⁄
8
of sight glass. Adjust the oil level as required.
No oil should be removed unless the crankcase heater
has been energized for at least 24 hours. See Oil Charge
section on page 57 for Carrier-approved oils.
7. Electrical
power
source
must
agree
with
unit
nameplate.
8. Crankcase heaters must be firmly locked into compres-
sors, and must be on for 24 hours prior to start-up.
9. Fan motors are 3 phase. Check rotation of fans during
the quick test (see Quick Test section below). Fan ro-
tation is clockwise as viewed from top of unit. If fan is
not turning clockwise, reverse 2 of the power wires.
10. Check compressor suspension. Mounting rails must be
floating freely on the springs.
11. Perform quick test to verify proper settings. See Con-
trols and Troubleshooting literature for more details.
Quick Test (See Fig. 19 and Table 8) —
Both main
power and control circuit power must be on.
The quick test program utilizes a 2-digit LED (light-
emitting diode) display (Fig. 19) on set point board to show
status of all input and output signals to microprocessor con-
trol. Display action and quick test procedure are described
as follows:
The quick test is a 42-step program that provides a means
of checking all input and output signals of microprocessor
control prior to unit start-up. This check ensures that all con-
trol options, thermistors, and status switches are in proper
working order.
To initiate the quick test program, first turn unit control
switch to the ON position. When
appears in display,
immediately press display button once. An
will
appear in display; this indicates that microprocessor in con-
trol system is ready to run quick test program.
IMPORTANT: Do not allow unit control circuit
to remain energized with
showing in display
for more than 2 minutes. If display button is not pressed
within this time, control will attempt to start unit.
For each step of the 42-step program, display button must
be pressed twice. On first press, step number is displayed;
second press initiates required action, and code as shown in
Table 8 is displayed.
NOTE: Step number is a numeral followed by a decimal point
(a 2-digit number has a decimal point after each numeral).
Action code number is one or 2 digits with no decimal point(s).
IMPORTANT: Once quick test is initiated, display but-
ton must be pressed at least once every 10 minutes for
control to remain in quick test mode. If button is not
pressed within this time, control will attempt to start
unit.
To recheck any step in quick test, control must be re-
cycled by turning unit control circuit switch off for a few
seconds, then on again. Restart quick test program as de-
scribed above and proceed through quick test steps. Press
display button twice for each step until step to be rechecked
is reached.
The quick test program is divided into 3 sections as de-
scribed below and shown in Table 8. For more detailed in-
formation, refer to Controls and Troubleshooting literature.
*Lead compressor only.
Fig. 18 — Compressor Connections
(Lead Compressor Shown)
44
