Installation & Operation Manual
6 Hydronic piping (continued)
12.Boiler purge valve:
Field supplied. The boiler purge valve is used to remove entrapped air from the heat exchanger during
13.System temperature sensor:
Lochinvar supplies a system temperature sensor. The sensor is to be installed in the heating loop downstream from the boiler hot water piping and heating loop junction. The sensor should be located far enough downstream to sense system diluted water temperature.
14.Y-Strainer:
Field supplied. A
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
Near boiler piping connections
Figure 6-4A Near Boiler Piping w/Y-Strainer
Figure 6-4B Near Boiler Piping w/Low Loss Header
SYSTEM PUMP |
|
|
|
SYSTEM SENSOR |
|
| M |
|
| O E | |
|
| T | T |
AIR SEPARATOR |
|
| S |
| SY | ||
DRAIN |
|
|
|
(TYPICAL) |
| M | M |
|
| ||
| O | ||
AIR VENT VALVE | R | E | |
F | S |
| |
|
| T |
|
| Y |
| |
LOW LOSS HEADER | S |
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|
|
|
| |
(TYPICAL) |
|
|
|
| EXPANSION TANK | ||
| FAST FILL VALVE |
| INDIRECT |
|
|
| |
DRAIN |
| M | DOMESTIC |
| HOT WATER | ||
O | |||
VALVE | F |
| |
| R |
|
|
| O | TANK | |
|
| ||
| T |
| |
BOILER PUMP
TO FLOOR
DRAIN
Variable speed pump option
DIRT SEPARATOR
SYSTEM SENSOR
SYSTEM PUMP
O
T
M
E
T
S
Y
S
BOILER PUMP
| M | M | |
| O |
| |
R | E | ||
F |
| T |
|
| S |
| |
| Y |
|
|
S |
|
| |
DOMESTIC HOT
WATER PUMP INDIRECT
M | DOMESTIC | |
HOT WATER | ||
O | ||
F | ||
R |
| |
O | TANK | |
| ||
T |
|
Variable speed pump setup
Before operation, ensure the following:
-Pump is set for an input signal of 0 - 10VDC by the dip switches on the pump control
-Pump is set for external signal control (if applicable)
-Pump is set for linear output (if applicable)
-If pump does not come equipped with a 0 - 10 VDC input option, an optional module will be required from the vendor
TO FLOOR
DRAIN
39 
