LAARS Mini-Therm JVS (Sizes 50-225) - Install and Operating Manual - Manual (Page 19)

Mini-Therm JV Page 19
Figure 12. Typical Plumbing Diagrams.
JV
From
System
To
System
NON-LOW TEMPERATURE SYSTEMS
(120°F+ Return Temps)
Simple Primary/Secondary Piping - Hydronic - Not Low Temp
NOTE: All closed loop systems should include air elimination, expansion tank and feed water inlet. Place at point of lowest pressure (typically
at the inlet of pump).
NOTE: Ball valves should not be used as balancing valves. Only use for shutoff apps.
LOW TEMP SYSTEMS
JV
120°+
From
System
To
System
Primary/Secondary Piping with Variable Speed Injection
Variable Speed
Control
Pump
Pump
Isolation Valve
Isolation
Valve
The preferred piping configuration for JV boilers is always using primary/secondary piping.
There are some applications that are acceptable without primary/secondary piping, see below.
From
System
To
System
Primary/Secondary Piping with Field Balancing
(for Fixed Low Return Temperatures)
JV
Pump
Isolation Valve
Isolation
Valve
Balancing
Valve
Balancing
Valve
Pump
From
System
To
System
Tempering Valve with System Loop
and Boiler Loop Pump
JV
Pump
Isolation Valve
Isolation
Valve
Tempering
Valve
Pump
From
System
To
System
Primary/Secondary
System Loop with Tempering Valve and Pump with Boiler Loop
with Tempering Valve and Pump
JV
Pump
Isolation Valve
Isolation
Valve
Tempering
Valve
Pump
Tempering
Valve
Isolation
Valve
Isolation
Valve
Pump
Pump
JV
From
System
To
System
Primary/Secondary Piping with By-Pass
(for Fixed Low Return Temperatures)
Pump
Isolation
Valve
Pump
Isolation
Valve
Balancing
Valve
Balancing
Valve
Primary/Secondary Piping with Automatic By-Pass
Pump
Pump Isolation
Valve
Isolation
Valve
Auto
By-Pass
Valve
From
System
To
System
JV
JV
From
System
To
System
Primary/Secondary Piping with Laars
Thermostatic Union as an Automatic Bypass
Pump
Isolation
Valve
Pump
Isolation
Valve
Laars
Thermostatic
Union
PN 2400-030
Balancing
Valve
NOTE: All closed loop systems should include air elimination, expansion tank and feed water inlet. Place at point of lowest
pressure (typically at the inlet of pump).
NOTE: Ball valves should not be used as balancing valves. Only use for shutoff apps.