Lochinvar 800 - Manual (Page 36)

Installation & Operation Manual
36
6
Hydronic piping
Near boiler piping connections
Y-STRAINER
(RECOMMENDED)
BOILER PUMP
INDIRECT
DOMESTIC
HOT WATER
TANK
SYSTEM PUMP
TO FLOOR
DRAIN
TO
FROM
FROM SYSTEM
TO SYSTEM
DOMESTIC HOT
WATER PUMP
Figure 6-4A Near Boiler Piping w/Y-Strainer
Figure 6-3 Flow Switch Adjustment
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.
NORMALLY
OPEN
SENSITIVITY
ADJUSTMENT
NORMALLY
CLOSED COMMON
GROUND
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.
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
Table 6A Paddle Size / Sensitivity Screw Adjustment
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.
DRAIN
(TYPICAL)
AIR SEPARATOR
AIR VENT VALVE
EXPANSION TANK
LOW LOSS HEADER
(TYPICAL)
Y-STRAINER
(RECOMMENDED)
DRAIN VALVE
FAST FILL VALVE
INDIRECT
DOMESTIC
HOT WATER
TANK
SYSTEM SENSOR
SYSTEM PUMP
TO FLOOR
DRAIN
TO
FROM
FROM SYSTEM
TO SYSTEM
Figure 6-4B Near Boiler Piping w/Low Loss Header