Webasto BCT010300C Repair Manual download pdf (Page 36)

Troubleshooting – Refrigerant Compressor

Webasto Product N.A., Inc. 34 www.techwebasto.com

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6.4.3 Checking for Other Electrical Problems

in Single Phase Motors

This section provides procedures for checking the

components such as the thermal protector, relay and

capacitor in a single phase compressor.

The BlueCool Truck System uses a specifically designed

refrigerant compressor for this assembly. The compressor

electrical motor is the type, PSC with external surface

mounted thermal and current overload protection.

This system also uses a run capacitor and a start capacitor

with an internal relay.

The electrical system of this type of compressor motor is

shown in Fig. 34.

Figure 34. PSC Compressor Motor with External Thermal/

Current Protector, Run Capacitor and Start

Capacitor

Overheat/Overload

Protector

Run

Capacitor

Start

Capacitor

(with relay)

Line 1 + 60 VAC (Black)

Line 2 – 60 VAC (White)

Ground (Green)

Compressor Unit

Ground

Main Motor Winding

Start Winding

Compressor Housing

Black

White White

Red/Black Stripe

Black

DC/AC Power Inverter

Green

Table 11. Troubleshooting PSC Compressor Circuits

Step 1: Before Continuing with

Troubleshooting...

All electric power should be disconnected and you should

have already made sure that the compressor does not have

a ground fault (see “Checking for a Ground Fault” on

page 32).

You should have also checked the windings for continuity and proper

resistance (see “Checking for Continuity and Proper Resistance” on

page 33) making sure the system is getting proper voltage and that all

controls, thermostats, etc. are working properly.

Step 2: Check Wiring Confirm that there is continuity between C and the thermal protector

common lead wire.

Step 3: Check External Thermal

Protector

Check for continuity across the thermal protector. If there is no continuity,

then the thermal protector may be tripped. Wait at least 5 minutes, then

check continuity again. If there is still no continuity, replace the thermal

protector.

WARNING

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Webasto BCT010300C Repair Manual Page 36

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