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14
3 Hydronic piping
12. 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. Typically the sensor will be
located far enough downstream to sense system diluted
water temperature.
13. Indirect water heaters:
The outdoor boiler may be piped to an indirect
water heater to heat domestic hot water with the space heat
transfer medium. As depicted on pages 17 through 23
there are two options when utilizing an indirect water
heater.
A. The space heating piping will branch off to flow the
space heat transfer medium through a single wall
heat exchanger coil inside the indirect water heater.
B. The indirect water heater is connected to the system
supply piping. A pump controlled by the
outdoor boiler’s control will regulate the flow of
water through the indirect water heater. The indirect
water heater’s temperature will be regulated by the
outdoor boiler’s control.
The outdoor boiler is pre-configured to control the
operation of the DHW pump with Domestic Hot Water
Prioritization programming. The DHW programming is
designed to control and balance the space heating
demand by switching between DHW and space heating.
ƽ WARNING
The National Standard Plumbing Code
and the Uniform Plumbing Code limit the
pressure of the heat transfer fluid to less
than the minimum working pressure of the
potable water system up to 30 psi maximum.
Also, the heat transfer fluid must be water
or other non-toxic fluid having a toxicity of
Class 1, as listed in Clinical Toxicology of
Commercial Products, 5
th
Edition.
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.
CAUTION
It is up to the installer to ensure the
minimum system flow is not less than the
minimum boiler flow at any time.
Circulator sizing
The outdoor boiler heat exchanger does have a pressure drop,
which must be considered in your system design. Refer to the
graph in FIG. 3-3 for pressure drop through the outdoor boiler
heat exchanger.
INDIRECT
DOMESTIC
HOT WATER
TANK
TO FLOOR
DRAIN
DOMESTIC HOT
WATER PUMP
BOILER
PUMP
SYSTEM
PUMP
Y-STRAINER
(RECOMMENDED)
DRAIN
(TYPICAL)
TO SYSTEM
FROM SYSTEM
FROM
T
O
IMG00377
Figure 3-2A Near Boiler Piping w/Y-Strainer
Y-STRAINER
(RECOMMENDED)
FILL VALVE
EXPANSION TANK
DRAIN VALVE
SYSTEM SENSOR
AIR SEPARATOR
LOW LOSS HEADER
(TYPICAL)
AIR VENT VALVE
DRAIN
(TYPICAL)
T
O
S
Y
S
T
E
M
F
R
O
M
S
Y
S
T
E
M
F
R
O
M
T
O
INDIRECT
DOMESTIC
HOT WATER
TO FLOOR
DRAIN
BOLIER PUMP
IMG00378
Figure 3-2B Near Boiler Piping w/Low Loss Header
Near boiler piping connections
Outdoor Knight Boiler Installation & Operation Manual
Lochinvar offers the Squire which is a series of indirect
water heaters. The Squire features a stainless steel vessel
with a single wall stainless steel heat exchanger.