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6 − 14 T-364
6.20 VALVE OVERRIDE CONTROLS
Controller function code Cd41 is a configurable code
that allows timed operation of the automatic valves for
troubleshooting. Test sequences are provided in
Table 6 − 1. Capacity mode (CAP) allows alignment of
the economizer solenoid valve in the standard and
economized operating configurations. DUV Capacity
Modulation, % Setting (PCnt) and Electronic Expansion
Valve (EEV) allows opening of the digital unloader valve
and electronic expansion valve, respectively, to various
percentages. If the unit is equipped with an LIV, the
Liquid Valve Setting allows the LIV to be automatically
controlled, or manually opened and closed.
The Override Timer (tIM) selection is also provided to
enter a time period of up to five minutes, during which
the override(s) are active. If the timer is active, valve
override selections will take place immediately. If the
timer is not active, changes will not take place for a few
seconds after the timer is started. When the timer times
out, the override function is automatically terminated
and the valves return to normal machinery control. To
operate the override:
a. Press the CODE SELECT key then press an AR-
ROW key until Cd41 is displayed in the left window.
The right window will display a controller communica-
tions code.
b. Press the ENTER key. The left display will show a test
name alternating with the test setting or time remain-
ing. Use an ARROW key to scroll to the desired test.
Press the ENTER key, SELCt will appear in the left
display.
c. Use an ARROW key to scroll to the desired setting,
and then press the ENTER key. Selections available
for each of the tests are provided in Table 6 − 1.
d. If the timer is not operating, follow the above proce-
dure to display the timer. Use an ARROW key to scroll
to the desired time interval and press ENTER to start
the timer.
e. The above described sequence may be repeated
during the timer cycle to change to another override.
Table 6 − 1 Valve Override Control Displays
Left Display Controller Communications Codes
(Right Display)
Setting Codes (Right Display)
Cd 41/SELCt
tIM
(Override Timer)
0 00 (0 minutes/0 Seconds)
In 30 second increments to
5 00 (5 minutes/ 0 seconds)
PCnt
(% Setting − DUV Capacity Modulation)
AUtO
(Normal Machinery Control)
0
3
6
10
25
50
100
EEV
(% Setting − Electronic Expansion Valve)
AUtO
(Normal Machinery Control)
CLOSE (Closed)
0
3
6
10
25
50
100
CAP
(Capacity Mode)
AUtO
(Normal Control)
Std
UnLd
(Economizer = Closed)
ECOn
(Economizer = Open)