Lochinvar 400 - Manual (Page 39)

Installation & Operation Manual
39
6
Hydronic piping
(continued)
Near boiler piping connections
Y-STRAINER
(RECOMMENDED)
BOILER PUMP
INDIRECT
DOMESTIC
HOT WATER
TANK
SYSTEM PUMP
TO FLOOR
DRAIN
TO
FR
OM
FR
OM
SY
ST
EM
TO
SY
ST
EM
DOMESTIC HOT
WATER PUMP
SYSTEM SENSOR
DIRT SEPARATOR
Figure 6-4A Near Boiler Piping w/Y-Strainer
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
FR
OM
FR
OM
SY
ST
EM
TO
SY
ST
EM
BOILER PUMP
Figure 6-4B Near Boiler Piping w/Low Loss Header
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. The sensor should be
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.
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