Applications - Takagi T‐KJr2‐IN Installation Manual And Owner's Manual

APPLICATIONS

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WARNING
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* The recirculation pump is to be controlled by:
‐Dual‐set aquastat (recommended w/timer)
OR
‐"Pump Control Mode" (T‐D2 Models only).
Refer to p. 23.
* The recirculation pump is to provide no less
than 2 GPM and no more than 4 GPM through
each activated unit in the system.
Hot water outlet to
fixtures
‐Space‐Heating Applications‐
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 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 125 °F (52°C) 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‐temperature boiling,
resulting in excessive noise and damage to the water heater. Consult with
the glycol maker for specifications prior to use.
‐Recirculation‐
Recirculation
Air
pump
separator
This is a concept drawing only.
Air Vent
S
Check valve
Check valve
28
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Page
Installation
Hot Cold
Water Water Gas
Outlet Inlet Inlet
Unions
Ball valves
Gas supply
Expansion tank
Cold water
inlet
Y‐Strainer