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APPLICATIONS
• 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
WARNING
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.
*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.
Hot water outlet to fixtures
This is a concept drawing only.
-Space-Heating Applications-
-Recirculation-
Air vent
S
Check valve
Recirculation
Air
pump
separator
35
Page
Installation Manual
Unions
Ball valves
Gas supply
Expansion tank
Check valve
Y-Strainer
Installation
Cold water inlet
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