gledhill StainlessLite HP180IND, Design, Installation & Servicing Instructions

Page: 13 / 32

Page 13
Safety
Cut-out
Thermostat
Immersion Heater Wiring
E
L
N
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.
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 80°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 opposite.
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.
Typical schematic wiring diagram for the boost immersion heater
using immersion programmable immersion heater timer.
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
INSTALLATION