John Wood Takagi - 240H-340H-540H - Manual (Page 31)

31
Page
APPLICATIONS
-Space-Heating Applications-
-Recirculation-
*The recirculation pump is to be controlled by:
-Dual-set aquastat (recommended w/timer)
*The recirculation pump is to provide no less than 7.5 L/min (2 GPM) and no more than 15 L/min (4 GPM) through
each activated unit in the system.
Installation
Installation Manual
• In order to purge air in water pipes within a closed-loop system, an air vent
and air separator should be installed in the system. Required circulation
flow rates are labeled next to each application diagram. These flow rate
requirements must be followed.
• Toxic chemicals used in boiler treatments such as alcohol, glycerol and glycol
groups must not be introduced into the system if the system incorporates an
open-loop potable water system.
• The water heater 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 higher
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 scalding.
• 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-temperature boiling,
resulting in excessive noise and damage to the water heater. Consult with the
glycol maker for specifications prior to use.
WARNING
Air vent
Hot water outlet to fixtures
Recirculation
pump Air
separator
S
Check valve
Check valve
Y-Strainer
Cold water inlet
Expansion tank
Gas supply
Ball valves
Unions
Hot
w
at
er
ou
tle
t
Cold
w
at
er
in
le
t
Gas in
le
t
Pressure
relief valve
This is a concept drawing only.