Carrier PrimeLINE 69NT40-561-200, Руководство по эксплуатации и обслуживанию

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7–33 T-362
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:
1. Press the CODE SELECT key then press an Arrow key until Cd41 is displayed in the left window. The right
window will display a controller communications code.
2. Press the ENTER key. The left display will show a test name alternating with the test setting or time remaining.
Use an Arrow key to scroll to the desired test. Press the ENTER key, SELCt will appear in the left display.
3. 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 7–1 .
4. If the timer is not operating, follow the above procedure to display the timer. Use an Arrow key to scroll to the
desired time interval and press ENTER to start the timer.
5. The above described sequence may be repeated during the timer cycle to change to another override.
7.26 Autotransformer
If the unit does not start, check the following:
1. Verify the 460 VAC (yellow) power cable is plugged into the receptacle (see Figure 7.18 ) and locked in place.
2. Verify that circuit breakers CB-1 and CB-2 are in the “ON” position. If the circuit breakers do not hold in,
check voltage supply.
3. Using a voltmeter, and with the primary supply circuit ON, check the primary (input) voltage (460 VAC). Next,
check the secondary (output) voltage (230 VAC). The transformer is defective if output voltage is not available.
Table 7–1 Valve Override Control Displays
Left Display Controller Communication 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)