BTH Electric Boilers
USE & CARE MANUAL
(Revision August /06)
, Page
6.
Installation
The manufacturer’s warranty does not cover
any damage or defect caused by installation,
or attachment, or use of any special
attachment other than those authorized by the
manufacturer into, onto, or in conjunction with
the water heater. The use of such
unauthorized devices may shorten the life of
the boiler may endanger life and property. The
manufacturer disclaims any responsibility for
such loss or injury resulting from the use of
such unauthorized devices
WIRING
Wiring must conform to the National Electrical
Code and to state or local code requirements.
The electric boiler must be electrically grounded in
accordance with local codes, or, in the absence of
local codes, with the National Electrical Code.
240Vac models
Wiring must be from a 240 Volt (single phase, 60
Hz) circuit protected by a properly sized breaker.
Wire gage (3 wires, ground) must be properly
sized. Consult the boiler rating plate to select the
proper breaker and wire gage.
600Vac models
Line wiring must be from a 600 Volt ( 3 phase, 60
Hz) circuit protected by a properly sized breaker.
Wire gage (3 wires, ground) must be properly
sized. Consult the boiler rating plate to select the
proper breaker and wire gage.
Circulator zoning wiring
Components must be wired to ensure that only the
circulator corresponding to the zone calling for
heat is actuated.
Zone valve zoning wiring
Connect the low voltage thermostat to the zone
valve. Components must be wired to ensure that
only the zone valve corresponding to the zone
calling for heat is actuated and that the circulator
is powered on a demand from any zone. The
transformer used to power the zone valves must
be sized for the load represented by all zone
valves in the heating system.
BOILER WATER CONNECTIONS
This electric boiler may be connected individually
or in parallel with other boilers. If two or more
boilers are connected, the “reverse-return piping”
method (whereby the boiler with the first return
inlet also has the last supply outlet and so forth
until the last return inlet corresponds to the first
supply outlet) should be used to connect the
boilers in parallel, to ensure an equal water flow
rate through each boiler.
The boiler water supply, located on the top side,
and the boiler water return, located on the bottom
side of the boiler are steel pipes (male NPT
threaded connection) where supply and return line
connections are to be made.
Installing a union is recommended on the boiler
water supply and return lines to facilitate boiler
disconnection for servicing.
Dielectric unions are required for protection of the
boiler and piping if dissimilar pipe material such as
galvanized steel and copper are present.
Use only clean, new piping for boiler water lines.
Local codes or regulations shall govern the exact
type of material to be used.
Insulate all pipes containing hot water, especially
in unheated areas.
Install shutoff (ball) valves for servicing
convenience. Thermometer(s) should be installed
on the boiler water supply and return lines.
Cap or plug unused connections on the boiler.
Do
not cap the pressure relief valve
on the boiler
since it will damage and shorten the life of the
boiler and may endanger life and property.
Flow check valve
If the heating system includes a single pump, then
to minimize flow by gravity and heat loss during
non-draw periods,
a flow check valve must be
installed.
Pressure relief valve
An automatic pressure relief valve must be
installed during boiler setup. The pressure rating
of the relief valve must not exceed 30 psi. The
safety relief valve must meet the requirements of
WARNING
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