23
Maintenance & Servicing
Maintenance requirements
To ensure the continued optimum performance of the Andrews Flexistor it should be regularly
maintained. This is of particular importance in hard water areas or where the water supply
contains particulate matter. Maintenance should be carried out by a competent person and any
replacement parts used should be authorised Andrews Flexistor spare parts. It is recommended
that maintenance is carried out every 12 months and includes the checks detailed below.
In hard water areas consideration should be given to periodically descaling the immersion heater
elements. To do this the Andrews Flexistor unit will need to be drained.
Check operation of Safety Valves
Slowly open the Temperature and Pressure Relief Valve by twisting its cap for a few seconds. Check
water is discharged and that it flows freely through the tundish and discharge pipe work. Check valve
reseats correctly when released.
NOTE
: The water discharged may be very hot.
Repeat the procedure for the Pressure Relief Valve.
Inspection
The immersion heater boss can be used as an access for inspecting the cylinder internally.
Clean the strainer
The strainer is incorporated within the Pressure Reducing Valve housing of the Valve. To inspect and
clean the strainer:
1.
Turn off the isolating valve prior to the Pressure Reducing Valve or the main stop cock to the
system.
2. Open the lowest hot tap in the system to relieve the system pressure.
3. Using a spanner unscrew the pressure reducing cartridge and remove the moulded housing.
The strainer will be removed with the cartridge.
4. Wash any particulate matter from the strainer under clean running water.
5. Replace the strainer and screw the Pressure Reducing Valve cartridge into the moulded
housing.
6. Close hot tap, turn on isolating valve or main stop cock to the system. Check for leaks.
Draining the Cylinder
Switch off the electrical supply to the immersion heater(s) and primary heat source, if used. Turn off
the mains water supply to the Andrews Flexistor unit. Attach a hosepipe to the drain valve having
sufficient length to take water to a suitable discharge point below the level of the unit, at least one
metre below the unit is recommended. Open hot water tap nearest to the Andrews Flexistor to
relieve the system pressure. Open drain valve. If water fails to drain from the Andrews Flexistor vent
the unit by manually opening the Temperature / Pressure Relief Valve.
Refilling system
DO NOT switch on the immersion heater(s) or primary heat source until the system has been
completely refilled.
Close the drain valve. With the hot tap open, turn on mains water supply. When water flows from the
hot tap allow to flow for a short while to purge air and to flush through any disturbed particles. Close
hot tap and then open successive hot taps in system to purge any air. The electrical supply can now
be switched on.
Summary of Contents for Flexistor 1000
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