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MINI ULTRA ELECTRIC BOILERS Installation and operating manual (Revision: May 2015)
8
Figure 4 : Typical installation on high temperature application
3.4.1 Pressure relief valve
This component supplied with the unit must be
installed directly to the boiler housing to the
appropriate connection according to the mounting
position.
Connect the outlet of the relief valve downward to
a safe location in case of discharge.
The piping diameter used for the discharge piping
shall not be smaller than that of the valve outlet.
No valve of any type, restriction or reducer
coupling should be installed on the discharge line.
Local codes shall govern the installation of relief
valves.
3.4.2 Expansion tank
The expansion tank must be able to store the
increase volume of boiler water occurring when
the boiler water increase in temperature. The
maximum allowable operating pressure is 30PSI
(207kPa). Contact your plumbing supply house for
assistance.
3.4.3 Water pressure regulator
The boiler should be installed in such a way that it
can automatically be fed with water in the event of
a pressure drop.
The minimum pressure obtained when the system
is cold is generally 12 psi (83kPa).
This accessory shall be equipped with one or
more check valves to avoid all possibilities of the
boiler water returning to the potable water supply
network (local regulation should be applied)
3.4.4 Air eliminator
Installation of manual or automatic air vents are
required to eliminate all air from the boiler and the
heating distribution system.
The main air eliminator must be installed near the
outlet of the boiler on the highest point of the main
supply piping. It is imperative to insure that all air
possibly located in the boiler be eliminated at all
time.
3.4.5 Circulating pump
The pump shall be selected such as to be able to
supply adequate flow in relation to the heating
distribution system on which it will be connected
and the heating capacity of the boiler installed.
The table below will give you details on required
water flow for distribution systems having to
operate with a temperature differential of 10F and
20F between their inlet and outlet
.
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