Page 30 Section 12: User Instructions
12 USER INSTRUCTIONS
12.1 USER INSTRUCTIONS
Your Grant QR indirect heat pump cylinder has been designed to
give many years of trouble-free service and is made from hygienic
high grade stainless steel.
IMMERSION HEATERS
Your Grant QR indirect heat pump cylinder is tted with one 3kW
immersion heater. Refer to Section 5.1 for further details.
The immersion heater in the cylinder can be used to heat your hot
water when your heat pump (or boiler) is switched o, e.g. during
the summer months.
In the case of a Grant Aerona³ heat pump, this immersion heater
may also be used to assist in the heating of your hot water. Check
with your installer.
The cylinder immersion heater thermostat has been factory-set to
position • • (refer to Figure 5-1) to give a hot water temperature of
around 65°C, but this could be lowered to 60°C if required.
The immersion heater incorporates an independent non self-
resetting over temperature cut-out device to prevent excessive
water temperatures. If this safety cut-out operates it can be re-set.
Refer to Section 6.3.
If the problem persists, please contact your installer.
DUAL THERMOSTAT
Your Grant QR indirect heat pump cylinder is also tted with a
Dual Thermostat (mounted on the cylinder). Refer to Section 5.4
for further details.
The cylinder control thermostat has an adjustment range between
25°C and 65°C. It is recommended that it is set between 50°C and
55°C for Grant Aerona³ heat pump installations
The high limit (overheat) thermostat will automatically operate if
the water temperature reaches 80°C. If this operates it can be re-
set. Please refer to Section A.1.3.
If the problem persists, please contact your installer.
TEMPERATURE SETTINGS
The hot water temperatures on the cylinder immersion heater
thermostat and dual thermostat should not be set any higher than
65°C otherwise nuisance tripping of either the immersion heater
safety cut-out, or the high limit thermostat (in the dual thermostat)
will occur. This temperature could be decreased to 60°C if
required.
Grant UK recommends that the dual thermostat is set between
50°C and 55°C for Grant Aerona³ heat pump installations.
Setting a lower target temperature will help to minimise the build-
up of lime scale and is likely to increase the longevity of your hot
water cylinder.
If you are in any doubt, these temperatures adjustments should
be best left to your installer.
HOT WATER
When a hot tap is turned on there may be a short surge of water,
this is quite normal with unvented systems and does not mean
there is a fault.
When you rst ll a basin the water may sometimes appear milky.
This is due to very tiny air bubbles in the water, which will clear
very quickly.
! WARNING !
If water is seen to ow from either the Temperature &
Pressure Relief (T&P Valve) valve or the Expansion Relief
Valve (EV) on the cylinder seek expert advice immediately.
If the water is owing from the T&P Valve, immediately:
1. Shut o the electrical supply to the immersion
heater(s).
2. Shut down the boiler or other heat sources to the
cylinder e.g. solar, heat pump, etc.
3. DO NOT SHUT OFF THE WATER SUPPLY TO THE
CYLINDER.
4. Contact your installer to check the system.
IMPORTANT
Do NOT tamper with any of the Safety controls tted to the
cylinder. If you suspect a fault always contact a competent
installer who is qualied to work on unvented water
cylinders.
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