Loading ...
Loading ...
Loading ...
MINI ULTRA ELECTRIC BOILERS Installation and operating manual (Revision: May 2015)
9
Your heating wholesaler shall be in good position
to recommend the appropriate model for your
application.
The pump motor capacity must not exceed 1/6HP
3.4.6 Drain valve
Installed at the lowest point of the unit, it allows
the unit to be drained for the eventual replacement
of a defective component.
3.4.7 Strainer
This component could be required on old heating
distribution systems made of steel or cast iron that
could carry sediments and sludge. If such
sediments accumulate at the bottom of the boiler it
could be harmful to the heat transfer of the
elements and generate premature failures.
3.5 ELECTRICAL CONNECTIONS
3.5.1 Main boiler supply
Boiler wiring and grounding must conform to the
National Electrical Code and to state or local code
requirements. The latter having precedence. The
electrical supply can be done in two different ways
depending on the necessity of supplying or not
external accessories (such as a pump) at 120Vac.
Alternative #1: A 120VAC electrical supply is
required to serve external accessories.
Electrical wiring must come from a 120/240 Vac/or
120/208Vac -1ph “L1-N-L2-” circuit protected by a
properly sized breaker.
Alternative #2: No 120Vac electrical supply is
required to serve external accessories (pump
is supplied by a separate circuit outside the
boiler)
Electrical wiring must come from a 240Vac or
208Vac- 1ph/60Hz “L1-L2” circuit protected by a
properly sized breaker.
Wire gauge must be properly sized by a qualified
electrician in such a way as to meet the national
electrical code.
To do so, consult the boiler rating plate which will
indicate the amperage drawn by the boiler at full
capacity. Extra amperage will have to be added if
external electrical equipments are connected to
the boiler.
This value and the electrical code will be used to
determine the electric cable required together with
the appropriate breaker.
Many other factors must be taken into
consideration in the selection of the appropriate
electrical material such as the length and the type
of cable used, the environment where the cable
will be installed and the type of the over-current
protection used.
The main terminal block of the boiler is suitable for
#14 to #2 wires.
Supply cables can be made of Aluminum or
Copper and be rated for a minimum of 75
o
C
(165
o
F).
If aluminum cables are used, it shall be of an
adequate size (generally bigger) and particular
consideration will have to be respected such as
the use of DE-OX inhibitors in order to meet the
National electrical code.
If the boiler electrical supply is on 208V, the
position of wire terminal on the transformer
connected to 240V will have to be changed to
208V.
3.5.2 Electrical supply of External
accessories
The total 120vac consumption of the boiler and
external accessories must not exceed 5A.
The maximum electrical consumption of 24vac
external accessories connected to R&C terminals
must not exceed 25VA.
3.5.3 Outdoor temperature sensor
If you want the boiler target temperature to
modulate according to the outdoor temperature
(when the outdoor temp. will get colder, the target
temp. will get higher). The supplied outdoor
sensor will have to be connected to S1 S1 before
turning the power on to the unit.
The installation of this sensor cancels the
operation of the boiler when the outdoor
temperature exceeds the selected value
corresponding to the maximum temperature
required for heating.
If you wish to operate the boiler at a fixed target
temperature, simply do not connect the sensor
before applying the power to the unit
The sensor shall be connected to terminals S1-S1
in the boiler using two 20 ga conductors.
Maximum length 100 ft. (33 m).
Do not put a jumper between S1&S1 if the outdoor
sensor is not used.
Model
Diff.10°F
usgpm
Diff. 20°F
usgpm
Boiler press.
loss
3 2.0 1.0 Insignificant
4.5 3.0 1.5
Insignificant
6 4.1 2.0
Insignificant
7.5 5.1 2.5
Insignificant
9 6.1 3.0
Insignificant
12 8.2 4.1
Insignificant
Loading ...
Loading ...
Loading ...