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Installation & Operation Manual
6Hydronic 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.
Consult the manufacturer’s instructions for wiring the flow switch to your system.
Table 6A Paddle Size / Sensitivity Screw Adjustment
MODEL | PADDLE SIZE | SENSITIVITY SCREW | |
ADJUSTMENT | |||
|
| ||
|
|
| |
Note: Paddles are included with the flow switch. | |||
399 | #3 | 7½ turns | |
500 | #3 | 5½ turns | |
600 | #3 | 7¼ turns | |
700 | #3 | 5¼ turns | |
800 | #3 | 3¼ turns |
Near boiler piping connections
Figure 6-4A Near Boiler Piping w/Y-Strainer
SYSTEM
FROM
|
| DOMESTIC HOT | |
SYSTEM PUMP | WATER PUMP | INDIRECT | |
| DOMESTIC | ||
|
|
| |
|
| FROM HOT WATER | |
| SYSTEM | TO | TANK |
TO |
|
| |
|
|
| |
| BOILER PUMP |
|
|
|
|
| |
| (RECOMMENDED) |
|
|
NOTICE
Turn the sensitivity screw clockwise to increase the flow rate required to activate the switch. Turn the sensitivity screw counterclockwise to decrease the flow rate required to activate the switch.
Figure 6-3 Flow Switch Adjustment
NORMALLY
OPEN
SENSITIVITY
ADJUSTMENT
TO FLOOR
DRAIN
Figure 6-4B Near Boiler Piping w/Low Loss Header
GROUND
COMMON NORMALLY
CLOSED
Circulator sizing
SYSTEM PUMP
SYSTEM SENSOR
AIR SEPARATOR
DRAIN
(TYPICAL)
AIR VENT VALVE LOW LOSS HEADER (TYPICAL)
TO | SYSTEM |
| |
SYSTEM | |
FROM |
|
EXPANSION TANK
FAST FILL VALVE | INDIRECT |
| |
DRAIN VALVE | DOMESTIC |
FROM HOT WATER | |
TO | TANK |
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
36
TO FLOOR
DRAIN