Installation, Operation and Maintenance Manual
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10
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Refrigerant coils have been evacuated and pre-charged with slight nitrogen holding charge. DO NOT
damage or disturb these coils and connections.
•
Water coils must have all inlet and outlet connections capped or closed tight to prevent foreign materials
and liquids from gaining entrance during the storage period.
Field Piping Connections Installation
When brazing, a supply of dry nitrogen gas needs to be fed through the refrigerant lines. Be sure to open the other
end of the refrigerant line to allow the nitrogen to bleed off and not pressurize the piping (Recommended pressure
3PSI
–
5PSI). Nitrogen needs to be flowing through the lines to eliminate carbon deposit build-up on the inside of
the joints. Carbon could contaminate the refrigerant and restrict the metering device. No soft soldering allowed.
Properly de-burr pipe ends with a tubing reamer. Ensure pipe end and inside surface of piping is clean before brazing
Use a silver/phosphorus/copper alloy with 15% silver for brazing coper to coper. Use flux and 45% silver or higher
when brazing copper to brass or other metals. Limit the flux to the minimum required to prevent contamination of
the joint internally. Flux only the male portion of the connection, never the female. After brazing, remove excess
flux.
All refrigeration piping materials are subject to changes in temperature and will expand and contract with
temperature change. Installation techniques must allow for expansion and contraction changes for piping
connections, this will prevent stresses which may buckle and rupture the copper piping or joints.
During the install
ation, the lines should be capped off and filled with dry nitrogen at the end of each day’s work or
until the system is completed and sealed.
Electrical Installation
NOTICE
.
All Electrical penetrations to the unit should be air leak tight to
prevent infiltration into the cabinet.
The field power and control wiring should enter the unit cabinet and electrical control panel in the areas provided
on the unit. If these openings do not work as provided, the electrical contractor must determine a more appropriate
area (in accordance with NEC and/or local code) for these opening and manually make the opening in the sheet
metal cabinet and/or electrical control panel. Connect the line power source to the input terminal block or optional
disconnect switch. The wiring diagram for each unit is located on the inside of the electrical panel door.
All field wiring should be done in a professional manner and in accordance with all governing codes. Before
operating unit, double check all wiring connections, including the factory terminals. Factory connections can vibrate
loose during shipment.
Installation of the optional remote temperature and humidity sensors should not be placed where they will be
directly affected by other equipment which gives off heat or moisture. Prevent exposure to direct sunlight.
Refrigeration Setup
WARNING
Before carrying out the pressure test, precautions must be taken to
evacuate all personnel from the area of risk and post notices advising that the
system or equipment is under pressure.
