P545 Series Electronic Lube Oil Control Product/Technical Bulletin 11
Troubleshooting Procedure
Control does not respond to
R310AD switch. (Indicated by the
green LED turning on for
approximately 4 seconds,
followed by the yellow LED
turning on for the duration of the
selected anti-short cycle time
delay. This process repeats
Use these steps to resolve the problem:
1. Check that resistor R39 has been cut and discarded.
2. Check the R310AD switch; replace if necessary.
Contactor energizes for 3 or
4 seconds. It remains off for the
duration of the anti-short cycle
time delay, and then repeats
(compressor is unable to start
during the 3 to 4 second period).
Insufficient current to the R310AD switch is the most likely cause of this condition.
Use these steps to resolve the problem:
1. Check compressor for internal overloads.
2. Check the compressor wiring.
3. Check compressor’s contactor.
4. Check compressor for general failure.
Ordering Information
Use the following tables to order the P545 control, the P400 switch, or accessories.
Table 3: P545 Electronic Lube Oil Control Ordering Information
Fits Compressors
Manufactured by
P545NCB-22C*
120 P400AD-2 WHA-P400-100 Copeland®
P545NCB-25C*
90 P400BD-1 WHA-P400-125 Bitzer
P545NCB-82C*
120 P400AD-1 WHA-P400-100 Carlyle
* Switch and wiring harness included
Table 4: P400 Single-Point Differential Oil Pressure Switch Ordering Information
Open Point
(Differential Pressure)
Close Point
(Differential above Open Point)
P400AD-1C*
7 ± 1.0 psid Less than or equal to 2.0 psid 3/4-16 UNF WHA-P400-100
Less than or equal to 1.5 psid
Less than or equal to 3.0 psid
* Wiring harness included