gledhill Stainless Lite HP SOL Indirect 180-400 litres Design, Installation & Servicing Instructions page 17

Lift up temperature/pressure relief valve
This safety device is also pre-set at the factory and relieves before the temperature
reaches 100°C. It is also a Pressure Relief Valve, and is pre-set to 6 bar.
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Immersion Heater Wiring
Immersion Heater
All stainless Lite HP models are fi tted with a 3kW immersion heater so that the store
temperature can be raised above that which the heat pump provides, to boost the
hot water performance if necessary and to protect against legionella eg. once a day
or once a week.
These are 3kW 240V AC heaters and incorporate a thermostat and a manually reset
energy cut-out which operates at 85°C. They have incalloy elements to prolong their
life expectancy in aggressive water conditions.
External wiring to the immersion heaters must be in accordance with the relevant IEE
Wiring Regulations and the circuit must be protected by a suitable fuse and a double
pole isolating switch.
The correct method of terminating the wiring to the immersion heater is shown above.
Usage of the product in non-domestic commercial applications can be extremely
intensive and stressful to various components. We recommend that titanium
immersion heaters are fitted in such situations, rather than the incoloy heater
supplied as standard. Titanium immersion heaters off er superior strength, weight
and a smoother fi nish which enable them to better withstand the extreme stress
and temperature fl uctuation often encountered within non-domestic environments
and situations where water quality is poor – ensuring improved performance and
extended operational life. This can be purchased as an extra from your Gledhill depot
under code number SH002.
Thermostat
Safety
Cut-out
Typical schematic wiring diagram for the boost immersion heater
using immersion programmable immersion heater timer.
Page 17
INSTALLATION
The operation of the boost immersion heater can
also be controlled by means of an independent
time switch as shown schematically below. The
'ON' time settings on the immersion heater
should be between 30 - 60 minutes later than
the 'ON' times set for the hot water programmer
channel.
For example if the hot water is programmed to
come on between 0600 - 0900 and 1700 - 2200
then the immersion heater setting should be
0640 - 0900 and 1740 - 2200. This will give hot
water heating by heat pump a priority.
Line Strainer
This is integral within the combination inlet
group to reduce the likelihood of contaminants
fouling the valve seat. Following installation
this line strainer must be cleaned and replaced.
This needs to be carried out on a regular basis.
as part of the annual maintenance/service
check.
Tundish
This is to allow the discharge from any Relief
Valve to be seen. It must be fi tted away from
any electrical devices. See page 13 for discharge
pipework details.
Safety
The immersion heaters must be earthed and
they must be isolated from the mains before
the cover is removed on every occasion.
Replacement immersion heaters should be
obtained from Gledhill Building Products
Limited.
Control/overheat Dual Thermostats
Care must be taken to ensure that the solar
probes are fully inserted into the pockets
provided.
INSTALLATION