Section 1: Introduction Page 5
1.8 SECONDARY CIRCUIT PIPEWORK
CONNECTIONS
All secondary circuit primary pipework connections to the cylinder
MUST be made in accordance with Figures 2-1, 2-2, 3-1 and
Section 4 (Secondary Circuit Installation).
1.9 TAPS AND FITTINGS
All taps and ttings incorporated in the unvented hot water system
should have a rated operating pressure of 7 bar or above.
1.10 HARD WATER SCALING
If the cylinder is used in a hard water area scaling will form
inside the cylinder and this will reduce both the performance and
working life of the cylinder.
Where the total hardness exceeds 125 ppm a high capacity water
softener, or suitable water conditioner, should be installed in the
incoming cold water supply to the cylinder.
The cylinder immersion heater control thermostat has been
factory-set to around 65°C. Please refer to Section 5.1 for further
information on the immersion heater/s supplied.
The water temperature control thermostats (on the immersion
heaters and dual thermostats) tted to the cylinder should be
set no higher than 65°C, however this could be decreased
to be between 50°C and 55°C depending on the end user’s
requirements.
Setting a lower target temperature will help to minimise the build-
up of lime scale and is likely to increase the longevity of the hot
water cylinder.
1.11 INSULATION
All Grant QR integrated indirect heat pump cylinders are insulated
with a 50mm layer of CFC/HCFC free, re retardant, polyurethane
foam injected between the stainless steel cylinder and the outer
casing. This polyurethane foam has a Global Warming Potential
(GWP) of 3.1 and an Ozone Depletion Potential (ODP) of 0.
1.12 HEALTH AND SAFETY
The information supplied in Table 2-1 will help you assess the
safest way to manoeuvre your cylinder into position.
Please use the table to nd the empty weight of your cylinder and
then consider how you can safely move it into its nal position.
Please leave these Installation and User Instructions with the
householder after installation.
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