Takagi 140 Indoor Installation Manual And Owner's Manual - Applications

35  

Page

Installation

Installation Manual

•  This water heater is suitable for combination water (potable) heating and 

space heating and not suitable for space heating applications only.

•  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 125 °F (52 °C) can cause severe burns instantly or 

death from scalding.

WARNING

S

Air vent

Hot water outlet to fixtures

Recirculation

pump

Air

separator

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

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 2 GPM (7.5 L/min) and no more than 4 GPM (15 L/min) through

  each activated unit in the system.

This is a concept drawing only.