Circulator Sizing; Near Boiler Piping Connections - Lochinvar Knight XL 100 Series Installation & Operation Manual

7
Hydronic piping

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 7-3 pressure drop through the Knight XL heat
exchanger.

Near boiler piping connections

Figure 7-2A Near Boiler Piping w/Y-Strainer
FROM
SYSTEM
T
AIR SEPARATOR DRAIN PORT
BACKFLOW
EXPANSION TANK
PREVENTER
BALL VALVE FLOW SWITCH
CIRCULATION MAGNETIC SEPARATOR
PUMP
Figure 7-2B Near Boiler Piping w/Low Loss Header
TO
SYSTEM
FROM
SYSTEM
MAKE UP
WATER
AIR SEPARATOR DRAIN PORT
BACKFLOW
EXPANSION TANK
PREVENTER
BALL VALVE
FLOW SWITCH
CIRCULATION MAGNETIC SEPARATOR
PUMP
(continued)
P
P
BOILER
PRESSURE
STRAINER / FILTER
REDUCING VALVE
LEGEND
PRESSURE RELIEF T P TEMPERATURE &
VALVE PRESSURE GAUGE
P
PRESSURE GAUGE WATER METER
SYSTEM SUPPLY
PIPING
SENSOR
DIR #2000585376 00
LOW LOSS
HEADER
T P
P
PRESSURE
STRAINER / FILTER
REDUCING VALVE
LEGEND
PRESSURE RELIEF T P TEMPERATURE &
VALVE
PRESSURE GAUGE
P
PRESSURE GAUGE WATER METER
SYSTEM SUPPLY
PIPING
SENSOR
DIR #20005857530 00
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
TO
SYSTEM
required from the vendor
MAKE UP
WATER
SMART TOUCH / Multi-temperature loop
control option
The Knight XL boiler is capable of producing up to
three (3) set point temperatures to meet different space
heating demands. When using more than one temperature
demand it is necessary to protect the lower temperature
loop from overheating. To help aid with this protection,
Lochinvar offers the Multi- Temperature Loop Control
Board Kit (100167843).
BOILER
Installation & Operation Manual
41