11
GENEVA
UNVENTED WATER HEATER
6. FILLING, COMMISSIONING & OPERATION
6.1. Filling and commissioning
a) Check that the expansion vessel charge pressure is 0.15 or 0.3 MPa.
b) Check that all water and electric connections are correctly configured.
c) Open the main stopcock and fill the unit. Open successive hot taps starting with the
tap furthest from the product. Leave each tap open for a few moments to allow all air and
debris from the system to exit. Close all of the taps.
d) Turn off the mains water supply to the cylinder and drain the system through the drain
cock.
e) Refill the cylinder with hot taps open and close when water flows freely.
f) Manually lift (by rotating the knob) both the expansion relief and the temperature and
pressure relief valves for a short period to remove trapped air from behind the valve
seating and to check the correct function of the discharge arrangement.
g) Check all joints for leaks and rectify as necessary.
h) With the product full of water, switch on the electricity supply. Check that the cylinder
heats the water and the thermostat operates. Turn on the hot taps to check that warm
water is delivered.
i) Check that while the unit is heating up, no water exits from either the expansion relief
valve or the temperature and pressure relief valve. If water does exit through the valves
check the expansion vessel pressure and installation.
j) Increase the temperature to maximum and allow the unit to heat and the temperature
to stabilise. Check that no water discharges from the valves. Turn on the hot taps to
drain the product of hot water. Set the thermostat to the required temperature and allow
the product to reheat ready for use.
6.2. Guidance
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 first fill a basin the water may sometimes appear milky. This is due to very tiny
air bubbles in the water which will clear very quickly.
If water is seen dripping through the tundish at any time switch off the electricity supply
immediately and call the installer or the Rointe Technical Service department on 0203 321
5929.
