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Relief valve outlet pipe diameter must not be of
smaller diameter than the relief valve outlet. The
oulet pipe end must be visible in order to
observe any relief incident and be protected
from freezing.
NEVER cap or plug a pressure relief valve
outlet. The pressure relief valve is a safety
apparatus and preventing its proper operation
may cause death, injury or property damage.
3.7.4 Operating pressure control &
expansion tank
The boiler is equipped with a factory installed,
pressure regulating make-up water equipped
with a flow check valve. This make-up water
allow filling of the boiler tank and the heating
system. It will also maintain a minimal operating
pressure cold pressure of 83 kPa (12 psi). When
operating the COMBOMAX ULTRA and the
heating system, pressure will vary between 83
kPa and
193 kPa (12 psi to 28 psi). The
operating pressure is affected by the type of
heating system and the size of the expansion
tank installed.
The expansion tank is used to absorb the
increase of water volume from the boiler and the
system when it is working.
The model selection should be based on the
maximum working temperature and the water
volume of all the system. For example, a system
with radiators contains much more volume than
a
baseboards
system.
COMBOMAX ULTRA also contains an important
volume of water that has to be added :
Combomax Ultra 50 : 48 usgal
Combomax Ultra 70 : 71 usgal
With this information, the installator or distributor
should be able to make an appropriate selection.
Here are some minimal recommendations for
different types of heating systems.
Combomax
Baseboards
Ultra
Combomax
#30
Ultra 50
Combomax
#60
Ultra 70
The expansion tank is generally installed on the
wall or ceiling and directly connected on the ½
NPTM nipple provided on the boiler. It also has
to be well supported.
COMBOMAX ULTRA Electric Boiler Installation, Use and Care Manual
Likewise,
the
Radiant
Cast-iron
floor
radiators
#30
#60
#60
#90
3.7.5 Automatic Air Vent
The COMBOMAX ULTRA has a factory installed
tank automatic air vent. This air vent function is
to vent any air present in the tank.
For proper operation, do not cap or block the air
bleeder outlet.
For proper operation of the heating system, it
may be necessary to add air bleeders to the
heating system circuits.
3.7.6 Heating pump
A circulating pump not included, is required for
the heating system to deliver heating fluid to the
different heating zones. Sizing of the pump is
base on the heating system configuration and is
done by the installator (heating technician,
plumber).
3.7.7 Low temperature heating (Radiant
floor)
A thermostatic mixing valve or a similar device,
offering the same function, must be installed on
a heating system operating at less than 65°C
(150°F)
like
radiant
thermostatic mixing valve limit the heating fluid
supplied to the system at a preset appropriated
temperature, by mixing hot heating fluid supplied
by the COMBOMAX ULTRA to the relatively
cold heating system fluid coming back from the
radiant floor (see figure 6).
3.8 DOMESTIC HOT WATER CIRCUIT
Please refer to figure 1 and 2 for components
identification and location of the domestic water
circuit.
3.8.1 Connecting the domestic hot water
piping
The COMBOMAX ULTRA boiler HOT WATER
OUTLET
and
the
connections are clearly marked. They are
located on the right side (when facing the boiler)
and are of ¾" NPTF type.
Use only clean copper or approved plastic pipe
for
water
connections.
regulations should govern the exact type of
material to be used.
Insulate
all
pipes
especially in unheated areas.
To facilitate the mixing valve ajustment, it is
recommended to install a thermometer on the
domestic hot water supply of the COMBOMAX
ULTRA.
(Revision june 2016)
floor
system.
The
COLD
WATER
INLET
Local
codes
containing
hot
water,
10.
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