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SECTION 3 • INSTALLATION
INSTALLATION
DESCRIPTION
The MAXXflo series is a direct fired condensing storage
water heater which has a stainless steel tank that is heated
by up to four burner modules placed outside the tank. A
burner module consists of a stainless steel heat exchanger
in which the burner is placed.
The water heater works according to the loading principle:
The water in the bottom of the tanks is led directly through
the heat exchanger, heated up and carried back to the top
of the tank. The temperature of the water at the bottom
of the tank (return temperature) is representative of the
input heat; the burner modulates on the basis of this
return temperature. The temperature at which the water
is supplied to the tank from the heat exchanger (supply
temperature) is kept at the set water heater temperature
using pump modulation.
An important advantage of bringing the heat transfer
from outside the tank is that the output is not influenced
by the temperatures that prevail in the tank. As long as
draw off occurs, the water from the bottom of the tank
to the heat exchanger is almost the same as the supply
cold water temperature. This means the maximum output
is maintained during the heating up period. On the final
heating period, when the tank is almost completely heated
up, the return temperature will increase and the burner
modulates. Because the water is pumped round from the
lowest point in the tank, the whole tank is heated up and
there are no cool zones.
The water heater is equipped with a maximum of four
burner modules dependent on the model. Each burner
module produces a maximum of 30.5 kW output for a set
water heater temperature of 60°C.
Minimum water pressure = 1 bar
THE LAW REQUIRES THAT THE INSTALLATION IS CARRIED
OUT BY A COMPETENT QUALIFIED PERSON
Installations must be carried out in accordance with
Gas Safety (Installation and Use) Regulations , Building
Regulations, The Water Supply (Water Fittings) Regulations
and any requirements of the local Gas Authority, Local
Authority, Water and Fire Authorities and the current
British Standards and Codes of Practice listed in Section 1.
LOCATION
The location selected for installation of the heater must
allow the provision of a satisfactory flue, adequate air
supply, drain facilities and must be well illuminated.
A purpose built water heater room or compartment is
strongly recommended.
A manual valve for isolation of the water heater room
should be installed in the gas supply. It should be clearly
identified and readily accessible for use at all times.
If a purpose built water heater room is not available,
measures should be taken to protect the heater from
damage and prevent any extraneous matter from being
stored on or around the heater. See BS6644 for details.
The heater must not be installed in any location which
contains a bed, bath or shower. There must be easy access
to the water heater room and heater at all times.
The water heater must be located in an area where leakage
from the tank, water connections or the combination
temperature and safety valve will not result in damage to
the area adjacent to the water heater. When such locations
cannot be avoided, a suitable drain tray must be installed
under the water heater. The drain tray must be no deeper
than 38mm and must be 100mm wider and longer than the
heater. The drain tray must be piped to an adequate drain
using 20mm (0.75in) diameter pipe, angled for proper
drainage.
Access must be provided to the front of the water heater
and adequate clearance for its servicing and operation.
The floor on which the heater is installed must be flat,
level and of sufficient strength to withstand the weight of
the heater when filled with water, and should satisfy the
requirements of the Local Authority & Building Regulations.
Any combustible material adjacent to the heater must be
so placed and shielded as to ensure that its temperature
does not exceed 66°C (150°F).
Place the water heater on a flat floor in a frost-proof area.
See pages 5, 6 and 7 for recommended service clearances.
MAXXflo Water Heater
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