Page 14
KN INSTALLATION AND OPERATION INSTRUCTIONS
Water piping
(continued)
Figure 9
Suggested piping — single boiler — circulator zoning — two-pipe or series loop (left), or primary/secondary piping (right)
Zoning with circulators
Sizing and flow control
Size circulators to provide the flow needed for the individual zones.
Provide flow/check valves where shown to prevent gravity circulation or
forced flow in idle zones.
DHW operation, when required
The piping shown throughout this manual allows for domestic water
heating without flow through the heating loop(s). This is important for
summertime operation of DHW tanks.
Make sure to incorporate flow/check valves as shown. These prevent forced
flow in idle zones.
L
egend
• • • • • • •
1
K N
boiler
2
Boiler circulator
4
Boiler/system circulator
5
Indirect-fired DHW tank
(when used)
6
DHW circulator
7
Flow/check valve
8
Cold water fill line
9
Expansion tank (shown with diaphragm-type — see
page 12 for piping a closed-type tank) Expansion tank
(shown with diaphragm-type — see page 12 for piping
a closed-type tank)
10
Air separator with automatic air vent (Replace air vent
with piping to the tank fitting on closed-type expansion
systems.)
11
Low water cut-off (when required)
12
Extra high limit (when required)
14
Zone circulator
16
Boiler postpurge circulator (see page 11)
K N-2
only
17
Header sensor, required where shown
Isolation valve
Purge valve — Suggested locations allow for improved
system filling and draining and initial air elimination.
Temperature gauge
5
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*