LAARS HP-M2 Series - Installation, Operation and Maintenance Instructions - Manual (Page 13)

H Series Page 13
5C. Hydronic Piping - HW Series
HW-M2 boilers are installed in single and
multiple zone systems ( using either zone valves or
zone circulators) in the same manner as any other
residential boiler. Systems with zone circulators or
single zone systems require the installation of a
hydronic flow check (6) to prevent gravity circulation
of heating supply water when no heat is desired.
To minimize heat loss from the storage tank
(HW) during standby periods, it is recommended that
the piping between the H Series up to and including
the vertical leg be insulated with ½" - ¾" of insulation.
Caution
Unless equipped with optional stainless steel tank,
the HW model must not be direct connected to a
heating system utilizing oxygen permeable tubing,
(see warranty). Provide a water to water heat
exchanger between systems to prevent corrosion of
tank or other components.
Nontoxic heating system antifreeze may be
added to the hydronic system provided that the
concentration does not exceed 35% and the antifreeze
contains an anti-foamant.
5D. Using In a Combined Hot Water
Heating and Chilled Water Cooling
System
When the H Series is used in connection with a
refrigeration system, it must be installed so that the
chilled medium is piped in parallel with the boiler
with appropriate valves to prevent the chilled medium
from entering it.
The boiler piping system of a H Series boiler
connected to heating coils located in air handling units
where they may be exposed to refrigerated air
circulation must be equipped with flow control valves
or other automatic means to prevent gravity
circulation of the boiler water during the cooling
cycle.
Figure 14. Hydronic Piping (HW).
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