NEO
fl
o
Water
Heater
8
September
2015
HEATER LOCATION
Th
e location selected for installation of the heater must
allow the provision of a satisfactory
fl
ue, and adequate air
supply (for type B
23
) A purpose built water heater room or
compartment is strongly recommended.
A manual valve for isolation of the gas supply to the heater
should be installed nearby and it should be clearly identi-
fi
ed 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 BS 6644 Clauses 4, 5 and 6 for details.
Th
ere must be easy access to the water heater room and
Heater at all times.
Th
e 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 it. When such locations
cannot be avoided, a suitable drain tray must be installed
under the heater.
Th
e drain tray must be no deeper than
38mm and must be 100mm wider and longer than the
heater. It should 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
with adequate clearance for servicing and operation. (Fig
2.1)
Th
e
fl
oor on which the heater is installed must be
fl
at,
level and of suf
fi
cient strength to withstand the weight of
the heater when
fi
lled with water, and should satisfy the re-
quirements of the Local Authority & Building Regulations.
Any combustible material adjacent to the heater must be
so placed and shielded as to ensure that it’s temperature
does not exceed 66ºC (150ºF).
WATER QUALITY AND TREATMENT
When installing an Andrews Water Heaters in hard water
areas we would recommend that a water treatment spe-
cialist is consulted. In hard water areas, scale formation
can occur in all hot water systems and water heaters.
Th
e
higher the temperature and volume of water used, the more
problematic the scale build-up can be. Water treatment is
normally recommended when the hardness reaches 100
- 150 ppm (7 – 10 degrees Clark) and above.
Th
is problem
can be minimised by reducing the water temperature in,
the heater and by
fi
tting suitable water pre-treatment
equipment. Andrews strongly recommend water pre-treat-
ment is
fi
tted, the base-exchange type of softener is recom-
mended for a guaranteed method of scale prevetion.
Th
e heater is
fi
tted with an inspection point and the tank
should be inspected at least annually. (Fig. 2.1 & 9.3)
WATER CONNECTIONS
Th
e cold water inlet and hot water outlet connection
nipples are identi
fi
ed on top of the appliance. Connect the
cold water feed and hot water outlet to these nipples with
union adaptors for ease of servicing. Connect the supplied
isolating valve to the drain connection and pipe to a
suitable discharge point.
CAUTION!
Do not apply excessive torque to these nipples when
making these connections.
Th
e use of an appropriate pipe
sealing compound is recommended
SECONDARY RETURN
(Fig 3.2)
A secondary return may be
fi
tted into the cold water inlet
to the storage cylinder down stream from the connection of
any unvented system kit or may be coupled into the storage
vessel drain point using suitable tee connections. In all
cases, for serviceability, the recirculation pipe must be
fi
t-
ted with a stop valve immediately before the reconnection
point.
DE-STRATIFICATION PUMP
(Fig 3.3)
A de-strati
fi
cation pump can be controlled by the heater.
It will operate automatically dependant upon the tempera-
tures in the tank. It is connected into the heaters main
wiring centre.
Th
e default condition for the pump is ‘Off’.
(
See P22 for setting
)
OPEN VENTED DESIGN
(Fig 3.1)
Th
e Heater must be supplied from a cold water feed cistern
and the hot water supply pipe must be
fi
tted with an open
vent pipe in accordance with BS 5546 and BS 6644.
Th
e Wa-
ter Supply (Water Fittings) Regulations must be observed
when installing the system.
Th
e cold water feed cistern must have an actual capac-
ity greater than the hourly recovery rate of the heater or
heaters to which it is
fi
tted, the minimum actual capacity
allowed for a feed cistern being 227 litres (50 gallons).
Th
e actual cistern capacity is the capacity to the normal
water level of the cistern. All cisterns should be manufac-
tured to the relevant British Standard.
Th
e distance from the normal water level to the top of the
cistern should comply with that speci
fi
ed by the Water
Authorities.
INSTALLATION OF HEATER
Summary of Contents for NEOflo SC25/200
Page 32: ...Published date November 2015...
