THERMO 2000 VOLTMAX 23, Use & Care Manual

Page: 11 / 38

TURBOMAX Use and Care Manual with Installation Instructions July 2014 Page
11
DOMESTIC HOT WATER TEMPERATURE
& PRESSURE RELIEF VALVE
An automatic temperature & pressure relief valve
with a temperature probe of sufficient length must
be installed at the time of the installation. No valve
of any type should be placed between the T&P
relief valve and the water heater. Use a tee to
install the relief valve onto the hot water outlet.
The pressure rating of the relief valve must not
exceed 150 psi.
The BTU per hour rating of the relief valve must
equal or exceed the BTU per hour input of the
boiler(s) or heat source(s) as marked on the
boiler(s) rating plate.
For a circulating tank installation, the separate
storage tank(s) must have similar protection.
Connect the outlet of the relief valve to a suitable
open drain, so discharge can exit only 6” above
the structural floor; and cannot contact any live
electrical parts. The discharge line must pitch
downward from the valve to allow complete
draining (by gravity) of the relief valve and
discharge line, and be no smaller than the outlet
of the valve. The end of the discharge line should
not be threaded or concealed and should be
protected from freezing. No valve of any type,
restriction or reducer coupling should be installed
in the discharge line. Local codes shall govern
the installation of relief valves.
THERMOSTATIC MIXING VALVE
When this water heater is supplying general-
purpose hot water requirements for use by
individuals, a thermostatically controlled mixing
valve is recommended to reduce the risk of scald
injury. Contact a licensed plumber or the local
plumbing authority for further information.
Keep temperature control of the mixing valve at
the lowest setting which is satisfactory.
When installing a mixing valve, locate it at the
bottom of anti-thermosiphon loop at least 24” high
to prevent excessive hot water from entering
mixed water supply.
VACUUM BREAKER (IF REQUIRED)
Install a vacuum breaker (or vacuum relief valve)
for water heater protection. Prevents siphoning of
the water from the system and collapse of the
water heater.
BOILER WATER CONNECTIONS
This water heater may be connected individually,
in multiples with others, or with an external
storage tank containing boiler water. If two
TURBOMAX
®
or more are installed, the piping
method to be used to connect the TURBOMAX
®
in
parallel should be “reverse-return piping”, so boiler
water flow rate through each TURBOMAX
®
is
equal.
The BOILER WATER SUPPLY and BOILER
WATER RETURN connections are clearly
marked. Boiler water supply connections are to
be made to the steel pipe (threaded connection) at
the top of the heater. Boiler water return
connections are to be made to the steel pipe
(threaded connection) at the bottom of the heater.
The installation of unions is recommended on the
BOILER WATER SUPPLY and BOILER WATER
RETURN lines, so that the water heater may be
easily disconnected for servicing if necessary.
Dielectric unions are required for protection of the
water heater and the pipes, if dissimilar pipe
material like galvanized pipe, copper and steel is
used.
Use only clean pipe for boiler water lines. Local
codes or regulations shall govern the exact type of
material to be used. Install shutoff (ball) valves for
servicing convenience. Thermometer(s) should be
installed to indicate the temperature of the boiler
water supply and return lines.
Circulator zoning recommendations
The preferred location of the circulator pumps for
each zone is on the boiler supply, with an
expansion tank between the boiler and the
circulators.
A flow check valve must be installed on each
zone, preferably at the outlet side of each
circulator pump, to prevent water flow to other
zones when they are not demanding flow
Zone valve zoning recommandations
The preferred location of the circulator pump is on
the boiler supply, with the expansion tank between
the boiler and the circulator.
Use zone valves with low pressure drop
specifications, particularly on the water heater
zone.