Figure 7.15 Autotransformer; Table 7-1 Valve Override Control Displays - Carrier Transicold 69NT40-561-001 Operation And Service Manual

Left Display
Cd 41/SELCt
7.22 Autotransformer
If the unit does not start, check the following:
1. Verify the 460 VAC (yellow) power cable is plugged into the receptacle (see
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. There is no internal protector for this transformer design. So, 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 available.
1) Dual Voltage Modular Autotransformer
2) Circuit Breaker (CB-2) 230-Volt
Table 7–1 Valve Override Control Displays
Controller Communications Codes
(Right Display)
tIM
(Override Timer)
PCnt
(% Setting - DUV Capacity Modulation)
EEV
(% Setting - Electronic Expansion Valve)
CAP
(Capacity Mode)

Figure 7.15 Autotransformer

2
1
Setting Codes (Right Display)
0 00 (0 minutes/0 Seconds)
In 30 second increments to
5 00 (5 minutes/ 0 seconds)
(Normal Machinery Control)
(Normal Machinery Control)
ECOn (Economizer = Open)
3) 460 VAC Power Receptacle
- - - - -
7–23
AUtO
0
3
6
10
25
50
100
AUtO
CLOSE (Closed)
0
3
6
10
25
50
100
AUtO (Normal Control)
Std
UnLd
(Economizer = Closed)
Figure 7.15) and locked in place.
3
T-340