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Unit Installation
Precautionary Measures During Line Brazing
All connections to indoor unit and to evaporator coil will be copper-to-copper. Brazing material
should be done with the use of a copper-phosphorous alloy such as Silfos-5 or equivalent. DO NOT
employ soft brazing alloy. Outdoor units contain service valves in both liquid and suction
connections. Total system refrigerant charge is retained inside the outdoor unit during shipment
and installation. Service valves are provided for evacuation and charging in accordance with these
instructions.
The application of precautionary measures to ensure that system is clean and dry will aid in the
avoidance of serious service problems.
¡CAUTION!
During line brazing always supply dry nitrogen through the lines due to the fact that temperature
is sufficiently high to cause metal oxide of copper tubing, unless an inert atmosphere is provided.
The flow of dry nitrogen must continue until the coupling/connection has cooled. Always use a
pressure regulator and security valve to ascertain that only low pressure dry nitrogen is introduced
into the line. Only a small amount of flow is required to move the air and prevent oxidation.
Precautionary Measures During Service Valve Brazing
Precautionary measures should be adopted to prevent heat damage to the service valve.Wrap a
wet cloth around the valve as shown in Figure 8. During brazing action, protect all painted surfaces
and insulation; also, be sure to remove the Schraeder core to protect it against high temperature
in the area due to the welding process. Once brazing has ended, wrap the coupling with a wet cloth.
In order to open the valve, it is necessary to remove the top of the plunger/piston and insert a hex
wrench over the valve stem to turn it counterclockwise until the valve stem reaches the angled
retention wall.
Connect refrigerant lines as follows;
1. Remove the Schraeder core taps from both service ports of liquid and suction lines' service
Figure 8. Protection against heat
2. Weld the liquid line to the liquid valve on the outdoor unit. Do not forget to wrap the body of
3. Protect the suction valve with a wet cloth and braze the suction line connection to the outdoor
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valves on the outdoor unit. Connect low pressure nitrogen flow to the service port of the liquid
line.
Wet cloth
Service valve
the valve with a wet cloth. Continue to allow the flow of nitrogen.
unit. The flow of nitrogen should be leaving the system from the service port connection of the
suction line. When this connection has cooled, remove the flow of nitrogen from the service
port at the liquid coupling.
MS-SVN052E-EN
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