gledhill Stainless Lite HP SOL Indirect 180-400 litres Design, Installation & Servicing Instructions page 10

Stainless Lite is a range of unvented hot water storage cylinders, manufactured in
the latest high quality duplex stainless steel. They are designed to provide mains
pressure hot water and are supplied as a package which complies with Section G3 of
the Building Regulations. The appliance is extremely well insulated using high density
HCFC free foam insulation with an ozone depleting potential (ODP) of zero and a global
warming potential (GWP) of 1. It is fi tted with all necessary safety devices and supplied
with all the necessary control devices to make installation on site as easy as possible.
Stainless Lite Heat Pump (HP) SOL models:
The Stainless Lite HP SOL is an unvented hot water storage cylinder fi tted with two
high effi ciency internal primary heat exchangers especially designed for use with
heat pump systems. These two heat exchangers must be connected in parallel to
the heat pump circuit when a solar thermal system is not installed, as shown in the
schematic on page 16. When both heat pump and solar thermal systems are installed,
the top heat exchanger is connected to the heat pump circuit and the bottom heat
exchanger is connected to the solar circuit a shown in fi gure 2.
All Stainless Lite HP SOL models are fi tted with 3kW (230Vac, 50Hz) immersion heater
for raising the temperature of the stored water to above 60°C after the heat pump
heating cycle if necessary. During commissioning the actual temperature that the
cylinder reaches when the thermostat(s) operate should be tested and adjusted so that
it achieves a minimum of 60°C in order to comply with the Legionella pasteurisation
requirements. The technical details of the Stainless Lite HP models are listed in table 1.
Important notes:
1. All Stainless Lite HP models are suitable for both open vented and sealed primary
systems.
2. When used with a sealed primary heating system, the heat pump must incorporate
its own over heat thermostat.
3. Stainless Lite HP models must not be used with solid fuel boilers or steam as the
heat source.
4. Heat pumps can normally only heat the domestic hot water to between 45 – 50°C,
therefore provision should be made to periodically heat the cylinder to above 60°C
to prevent growth of legionella.
5. The cold supply elbow c/w drain tapping must be fi tted as shown in fi gures 1 &
2. A fl exible hose can then be connected to the drain tapping and providing the
hose runs below the lowest level of the cylinder, then all the water content can
be drained out by the symphonic action.
Stainless Lite Heat Pump (HP) and Slimline models:
The Stainless Lite HP and Slimline cylinders unvented hot water storage cylinders fi tted
with a high effi ciency coil. The coil has a low pressure loss due to it being a multiple
pass coil which enable high fl ow rates to be achieved through it. In addition due to
the coil being corrugated the heat transfer rate is higher than that of plain tube coil.
The cylinder has been specifi cally designed for heat pump applications. It incorporates
an immersion heater at the base of the unit which enables pasteurisation of the water.
This should be done on a regular basis in line with HWA guidance..
The slimline has been designed to enable it to fi t into tighter locations.
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