Replacing The Condenser Fan Motor; Troubleshooting Thermostatic Expansion Valve - Traulsen G Series Service Manual

Replacing the Condenser Fan Motor:

6.4.3
9-Watt 115 Volt CW Shaded Pole
9-Watt 230 Volt CW Shaded Pole
9-Watt 115 Volt CW ECM
When replacing the motor, be sure to note the direction of air flow as well as the position of the fan blade. The
motor is designed to pull air through the condenser coil. The fan blade should be installed with the concave
toward the motor using speed nut included with motor. The vibration washer, which is supplied with motor,
must be installed between motor and fan blade. Torque speed nut to 10 IN-LB.
Refer above figure 66 to confirm the fan blade orientation when mounted on the bracket.
6.5

Troubleshooting Thermostatic Expansion Valve

All Traulsen G-Series Refrigerators and Freezers are equipped with a Thermostatic Expansion Valve or TXV. The
TXV is a type of metering device that meters liquid refrigerant into the evaporator coil. A TXV is superior to a
capillary tube metering device as it can respond to load changes. The TXV is designed to control the superheat
value of the refrigerant leaving the evaporator coil. This control of superheat is accomplished by a sensing
bulb that is secured to the outlet of the evaporator coil at the suction line. When the temperature of the
suction line increases at the sensing bulb (which is charged with refrigerant) the pressure in sensing bulb
increases opening the valve. This is the only opening force upon the valve so if the refrigerant charge is lost in
the sensing bulb (powerhead) the TXV will close starving the evaporator coil. If the sensing bulb is not
attached to the suction line properly the valve will likely open too much, flooding the evaporator.
Description
Table 19: Condenser Fan Motor Traulsen Part Number
AIR FLOW
Figure 66: Fan blade orientation
Traulsen Part Number
338-60049-00
338-60049-01
338-60049-02
66