Circulator Sizing; Near Boiler Piping Connections - Lochinvar KBN399 Installation & Operation Manual

6
Hydronic piping
Flow switch adjustment
Refer to Table 6A for the proper setting of the sensitivity
screw. For reference, the position of the screw prior to setting
should be turned clockwise with a Phillips driver until it stops
(FIG. 6-3). Proceed to turn the screw counterclockwise the
amount of turns listed in Table 6A based on the model.
Consult the manufacturer's instructions for wiring the flow
switch to your system.
Table 6A Paddle Size / Sensitivity Screw Adjustment
MODEL PADDLE SIZE
Note: Paddles are included with the flow switch.
399 #3
500 #3
600 #3
700 #3
800 #3
Turn the sensitivity screw clockwise to
NOTICE
increase the flow rate required to activate the
switch.
counterclockwise to decrease the flow rate
required to activate the switch.
Figure 6-3 Flow Switch Adjustment
GROUND
COMMON
34
SENSITIVITY SCREW
ADJUSTMENT
7½ turns
5½ turns
7¼ turns
5¼ turns
3¼ turns
Turn the sensitivity
NORMALLY
OPEN
SENSITIVITY
ADJUSTMENT
NORMALLY
CLOSED

Circulator sizing

The Knight XL heat exchanger does have a pressure drop, which
must be considered in your system design. Refer to the graphs
in FIG's 6-5 and 6-6 for pressure drop through the Knight XL
heat exchanger.

Near boiler piping connections

Figure 6-4 Near Boiler Piping
SYSTEM PUMP
TO
SYSTEM
screw
BOILER PUMP
Installation & Operation Manual
FROM
SYSTEM
TO FLOOR
DRAIN
DOMESTIC HOT
WATER PUMP
INDIRECT
DOMESTIC
HOT WATER
TANK