VOLTMAX ELECTRIC BOILER Installation and Operation Manual
(
Revised June 2017)
, Page
11.
Figure 1 : Possible pipe flow configurations
3.4.1.1 Boiler piping connection
The boiler is equipped with two fittings on each
side of the unit. One of the bottom connections
must be used for the heating return (inlet) and
one of the top connections must be used for
supplying the heating system (outlet).
The outlet and inlet size are 1½ "NPTM threaded
steel pipes, for the VOLTMAX with a power of
90kW and less
(5 elements) and 2½ "NPTM
threaded steel pipes for the VOLTMAX with a
power of
More than 90kW
(10 elements).
Installation of plugs on the inlet and exhaust
ducts
is
recommended
to
facilitate
the
disconnection and maintenance of the boiler.
When connecting different types of pipes
(galvanized steel and copper), use dielectric
joints (insulation) to protect the boiler and piping.
Use only new and clean pipes as piping
connection to the boiler. Local codes or
regulations may dictate the exact type of material
to be used.
Insulate all piping containing hot water, especially
in an unheated environment.
Install faucets for easy maintenance.
Install a thermometer on the inlet and outlet
duct(s).
Close the unused openings on the boiler.
Do not
block the safety valve
, this may cause loss,
damage or injury.
3.4.1.2 Auxiliary boiler piping connection
When an auxiliary boiler used as back up is
twinned to the DTH Ultra boiler to act as a back-
up controlled by the DTH Ultra, the auxiliary
boiler shall preferably be installed downstream of
the electric boiler as shown on Figure 5.
3.4.1.3 Safety valve
The installation of a safety valve is an integral
part of the boiler’s installation. The trigger point of
the valve must not exceed the design pressure of
the boiler as indicated on its registration and
identification plate. The valve must comply with
the ASME Boiler and Pressure Vessel Code and
limit the boiler maximum operating pressure. The
safety valve is a security component, not a
control component.
The capacity of the safety valve expressed in
BTU / hour must equal or exceed the rating on
the nameplate of the boiler (s).
Connect the exhaust of the safety valve to a drain
line. The lower end of this conduit shall be at
least 6" (15 cm) from the floor drain away from
any electrical component. The drain line must be
directed downwards from the exhaust of the
safety valve to ensure complete drainage by
gravity. The diameter of the drainpipe must not
be less than that of the exhaust of the valve. The
end of the conduit must not be threaded or
hidden and must be protected from freezing. No
valves, valves or valves shall be installed on the
pipe. The installation of the safety valves is
governed by the local code.
3.4.1.4 System
pressure
control
and
expansion tank
Pressure control devices within the system
ensure that each component operates within
minimum and maximum allowable pressures and
maintain minimum pressure for all normal
operating temperatures. They also allow air
