Hussmann proto-aire Manuel De Montage

Protocol™ Installation and 

Service Manual 

Water Loop Piping 

 

Important: 

Since Hussmann has no direct control over the installation, providing 

freeze-burst protection is the responsibility of the installing contractor.  

 

 
The Water Loop should be tested for leaks using pressurized water. 
 

 
Overview 
 
This section details major water loop components, and their locations in the piping system. 
 
Water Loop Guidelines 
 
Pipe Connections 
PVC Plastic pipe should be solvent welded (glued) together as described on the glue can. 
 
Pipe Fittings must be clean and dry. 
 
Cut Pipe with a guillotine type cutter to get a clean, square cut; remove any burrs. 
 
Use Purple Primer on both pipe and fitting before gluing. 
 
Apply glue to both pipe and fitting and join with a twisting motion. 
 
Hold joint together for approximately 30 seconds to allow glue to set. 
 
Allow to dry for 24 hours before putting in to service. 
 
Where it is necessary to connect plastic and metal pipe.  DO NOT USE A THREADED 
CONNECTION.  A compression type fitting  should be used.  For larger pipe sizes, a 
flanged connection may be used. 
 
Isolation Valves 
Install isolation valves at inlet and outlet of each Protocol™ unit. 
 
It is good practice to include isolation valves at several locations throughout the piping.  
For example valves should be used where branches tie into main supply and return lines. 
 
PVC plastic ball valves may be used. 
 
Strainers 
Use a 16-mesh strainer at inlet of each Protocol™ unit.  Position isolation valves so that 
this strainer can be opened for cleaning. 

 

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