Piping; Leak Testing - Howe 1000-RLE Installation & Service Manual

Piping

The Ice Flaker has been thoroughly cleaned and
dehydrated at the factory. However, foreign
matter may enter the system by way of the
piping to the condensing unit. Therefore, care
must be used during installation of the piping to
prevent entrance of foreign matter.
Install all refrigeration system components in
accordance with applicable local and national
codes and in conformance with good practice
required for the proper operation of the Ice
Flaker.
The refrigerant pipe size should be selected
from the Piping Table. The interconnecting pipe
size is not necessarily the same as the stub‐out
on the condensing unit or the Ice Flaker.
The following procedures should be followed:
1. Do not leave units or piping open to the
atmosphere any longer than is
absolutely necessary.
2. Use only refrigeration grade copper
tubing, properly sealed against
contamination.
3. Suction lines should slope 1/4" per 10
feet towards the compressor.
4. Refer to the Suggested Refrigerant
Piping Diagram (p.6) for suitable P‐type
oil trap locations to enhance oil return
to the compressor.
5. When brazing refrigerant lines, Dry
Nitrogen should be passed through the
line at low pressure to prevent scaling
and oxidation inside the tubing.
6. Use only a suitable silver solder alloy on
suction and liquid lines.
Leak Testing
After all refrigerant connections are made, the
entire system must be leak tested.
The complete system should be pressurized to
no more than 150 psig with refrigerant and dry
nitrogen (or dry CO ).
2
It is recommended that this pressure be held
for a minimum of 12 hours and then rechecked.
For a satisfactory installation, the system must
be leak tight.
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