Technical Details; Installation; Description; Location - andrews MAXXflo CWH30/200 Installation Manual, Operation And Maintenance Manual

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.
Important Note:
• Minimum water pressure = 1 bar
• Mains feed only
THE LAW REQUIRES THAT THE INSTALLATION
IS CARRIED OUT BY A PROPERLY QUALIFIED
PERSON
Installations must be carried out in accordance with Gas
Safety (Installation and Use) Regulations 1998, Building
Regulations, The Water Supply (Water Fittings)
Regulations 1999 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.

TECHNICAL DETAILS

XXXXXXXXX • SECTION XX
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 Clauses 4, 5
and 6 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.
9 9
• SECTION 2