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7.0
WATER QUALITY
7.1 WATER CHEMISTRY
Water supply quality may adversely affect the efficiency performance and longevity of Water Heaters and Hot
Water systems. Hard water may cause the formation of limescale that will reduce operating efficiency and may
cause early product failure. Please note the following: -
Maximum allowed water hardness is 205 PPM or 205 mg/L CaCO3 (= 11.5°dH)
TDS (total dissolved solids) may not exceed 350 PPM
Water hardness and TDS together may not exceed 350 PPM
The pH value of the water may not be under 6.5 and not above 7.5 (measured cold)
If TDS alone or the combined value is higher than the abovementioned, the water should be heated by
means of an indirect water-heating appliance.
Minimum water hardness = 80 PPM or 80 mg/L CaCO3 (= 4.5°dH)
Minimum TDS = 100 PPM
Water that is under these minimum values normally has a pH value, which is aggressive and corrosive.
If these values are exceeded a water treatment specialist should be consulted. Water
Softeners and Water Conditioners may be considered, but whichever method is selected, it
should be suitable for installation with Direct Gas-fired Water Heaters. A maintenance
regime will also be required for such systems
The formation of limescale or other solids can cause a blockage within the heat exchanger,
which in turn may cause premature failure. Such instances are not regarded as defects in
manufacture and will not be covered under the product warranty
8.0
LOCATION
8.1 PLANT ROOM REQUIREMENTS
The Lochinvar TTW condensing water heater can only be installed in a room that complies with the appropriate
ventilation requirements.
The Lochinvar TTW can be used as a type C
allowances for combustion air are not necessary; ventilation for cooling purposes however, must be fitted. For
further guidance, please refer to Section 9: AIR SUPPLY or to BS6644.
The Lochinvar TTW can also be used as a type B
ventilation for cooling and combustion must be provided. For further details, please refer to Section 9: AIR SUPPLY
or to BS6644.
8.2 GENERAL REQUIREMENTS
Corrosion of the heat exchanger and vent system may occur if air for combustion contains certain chemical
vapours. Such corrosion may result in poor combustion and create a risk of asphyxiation. Aerosol propellants,
cleaning solvents, refrigerator and air conditioning refrigerants, swimming pool chemicals, calcium and sodium
chloride, waxes and process chemicals are corrosive. Products of this sort should not be stored near the water
heater or outside by the air intake (if applicable). The fitting of this equipment in a situation where aerosols or
other chemicals may be entrained into the combustion air will invalidate the warranty.
The equipment must be installed on a level, non-combustible surface that is capable of adequately supporting its
weight (when filled with water) and any ancillary equipment. The operation of the equipment must not cause the
temperature of any combustible material in the vicinity of the equipment and its flue to exceed 65°C. If such a
situation is unavoidable, appropriate insulation should be provided.
Locate the equipment so that if the appliance or any connecting pipework should leak, water
damage will not occur. When such locations cannot be avoided, it is recommended that a suitable
drain pan be installed under the equipment. The pan should be adequately drained but must not
restrict the combustion or ventilation airflow.
, C
, C
C
or C
appliance. Due to its room sealed design, ventilation
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43,
53,
83
appliance. If such a configuration is to be used, then appropriate
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