Circulator Sizing; Near Boiler Piping Connections - Lochinvar 400 Installation & Operation Manual

6
Hydronic piping
12. Boiler purge valve:
Field supplied. The boiler purge valve is used to
remove entrapped air from the heat exchanger during
start-up.
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.
located far enough downstream to sense system diluted
water temperature.
14. Y-Strainer:
Field supplied. A Y-strainer or equivalent multipurpose
strainer is recommended at the inlet of the heat
exchanger to remove system particles from older
hydronic systems and protect newer systems.

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 6-4A Near Boiler Piping w/Y-Strainer
DIRT SEPARATOR
SYSTEM SENSOR
SYSTEM PUMP
Y-STRAINER
(RECOMMENDED)
BOILER PUMP
(continued)
The sensor should be
DOMESTIC HOT
WATER PUMP
INDIRECT
DOMESTIC
HOT WATER
TANK
TO FLOOR
DRAIN
Installation & Operation Manual
Figure 6-4B Near Boiler Piping w/Low Loss Header
SYSTEM PUMP
SYSTEM SENSOR
AIR SEPARATOR
DRAIN
(TYPICAL)
AIR VENT VALVE
LOW LOSS HEADER
(TYPICAL)
DRAIN
VALVE
Y-STRAINER
(RECOMMENDED)
BOILER PUMP
Variable speed pump option
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
EXPANSION TANK
FAST FILL VALVE
INDIRECT
DOMESTIC
HOT WATER
TANK
TO FLOOR
DRAIN
39