John Wood Takagi - 320H-520H - Manual (Page 23)

23
APPLICATIONS
Space-Heating Applications
WARNING
In order to purge air in water pipes
within a closed-loop system, an air
vent and air separator should be
installed in to the system. Required
circulation flow rates are labeled next
to each application diagram. These
flow rate requirements must be fol-
lowed.
Toxic chemicals used in boiler treat-
ments such as alcohol, glycerol and
glycol groups must not be introduced
into the system if the system incor-
porates an open-loop potable water
system.
The 520H can be used to supply
potable water and space heating and
shall not be connected to any heating
system or component(s) previously
used with non-potable water where
any chemicals were added to the
water heating appliances.
When the system requires water for
space heating at temperatures high-
er than required for other uses, a
means such as a mixing valve shall
be installed to temper the water for
those other uses in order to reduce
scald hazard potential.
Water temperature over 52°C (125°F)
can cause severe burns instantly or
death from scalds.
Chemicals such as diluted Glycol can
be used for radiant floor, Hydro/fan
coil air or Baseboard heating only.
The diluted solution of glycol must
contain between 25% and 55% of
Glycol. Be aware that in closed-loop
glycol systems, low pressure in the
heat exchanger can cause low-tem-
perature boiling, resulting in exces-
sive noise and damage to the water
heater. Consult with the glycol maker
for specifications prior to use. •
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