Goodmans ASX User Manual

60

2. Using an ohmmeter, test across the fuse link for continu-

ity - no reading indicates the link is open.  Replace as
necessary.

NOTE:  The link is designed to open at approximately 333°F.
DO NOT WIRE AROUND - determine reason for failure.

1. Disassemble and remove the heating element.

2. Visually inspect the heater assembly for any breaks in

the wire or broken insulators.

3. Using an ohmmeter, test the element for continuity - no

reading indicates the element is open.  Replace as
necessary.

When repairing the refrigeration system:

1. Never open a system that is under vacuum.  Air and

moisture will be drawn in.

2. Plug or cap all openings.

3. Remove all burrs and clean the brazing surfaces of the

tubing with sand cloth or paper.  Brazing materials do not
flow well on oxidized or oily surfaces.

4. Clean the inside of all new tubing to remove oils and pipe

chips.

5. When brazing, sweep the tubing with dry nitrogen to

prevent the formation of oxides on the inside surfaces.

6. Complete any repair by replacing the liquid line drier in the

system, evacuate and charge.

IMPORTANT NOTE: Torch heat required to braze tubes of
various sizes is proportional to the size of the tube. Tubes of
smaller size require less heat to bring the tube to brazing
temperature before adding brazing alloy.  Applying too much
heat to any tube can melt the tube. Service personnel must
use the appropriate heat level for the size of the tube being
brazed.

NOTE: The use of a heat shield when brazing is recommended
to avoid burning the serial plate or the finish on the unit. Heat
trap or wet rags should be used to protect heat sensitive
components such as service valves and TXV valves.

Copper to Copper Joints - Sil-Fos used without flux (alloy
of 15% silver, 80% copper, and 5% phosphorous).  Recom-
mended heat 1400°F.

Copper to Steel Joints - Silver Solder used without a flux
(alloy of 30% silver, 38% copper, 32% zinc).  Recommended
heat  - 1200°F.

Pressure test the system using dry nitrogen and soapy water
to locate leaks.  If you wish to use a leak detector, charge the
system to 10 psi using the appropriate refrigerant then use
nitrogen to finish charging the system to working pressure,
then apply the detector to suspect areas. If leaks are found,
repair them. After repair, repeat the pressure test. If no leaks
exist, proceed to system evacuation.