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Page
APPLICATIONS
-Combination potable water heating and space heating-
-Recirculation-
*The integrated recirculation pump is controlled by a programmed timer and ON/OFF temperatures are detected
by thermistors in the water heater. Refer to pp. 52 to 57 to set the timer and ON/OFF temperatures.
*Make sure flow rate of recirculation is not less than 2 GPM (7.5L/min) and no more than 4 GPM (15L/min)
through the system. Refer to p. 58 for "Manual pump activation" and p. 60 for how to check the flow rate.
Applications
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
•
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.
•
Failure to observe these warnings could result in severe personal injury or
death.
WARNING
Air vent
Hot water outlet to fixtures
Air
separator
S
Check valve
Check valve
Y-Strainer
Cold water inlet
Expansion tank
Gas supply
Ball valves
Unions
Hot w
at
er outle
t
Cold w
at
er inle
t
Gas inle
t
Pressure
relief valve
This is a concept drawing only.
Re
turn inle
t
