Carrier 69NT40-561-300, Operation And Service Manual

Page: 144 / 174

T-365 7–28
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.
6. The above described sequence may be repeated during the timer cycle to change to another override.
7.23 AUTOTRANSFORMER
If the unit does not start, check the following:
1. Make sure the 460 VAC (yellow) power cable is plugged into the receptacle (see Figure 7.20 ) and locked in
place.
2. Make sure 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. There is no internal protector for this transformer design, therefore, no checking of the internal protector is
required.
4. 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 avail-
able.
Table 7–1 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 - DLV/DUV Capacity)
AUtO
(Normal Machinery Control)
036
10
25
50
100
EEV
(% Setting - Electronic Expansion Valve)
AUtO
(Normal Machinery Control)
CLOSE (Closed)
036
10
25
50
100
CAP
(Capacity Mode)
AUtO
(Normal Control)
Std
UnLd
(Economizer = Closed)
ECOn
(Economizer = Open)