strada Aquatherm STA140UC, Technical Manual

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28/03/19
7
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Boilers – Set the boiler pump to its highest setting. Set the Boiler Thermostat and
also the tank thermostat to maximum. Fire the boiler on HOT WATER ONLY setting
and wait until the boiler goes off. Turn the cylinder thermostat down slowly till it
clicks off, then turn it down by approximately 2⁰C. This should mean that the tank
thermostat controls the system. This can be checked by running off some of the
hot water, re-firing the boiler and checking that the tank thermostat is in control.

Ensure the store temperature is set to 75⁰C (70⁰C minimum and 80⁰C maximum)
on the store temperature gauge. This can be increased but consideration should be
made for the temperature and pressure rise, caused by “creeping”, where small
draw offs are present.

On installs where central heating is run from the tank, ensure that 500mm height
difference is in place between the highest point of the radiator circuit and the
bottom of the Feed & Expansion Tank.

Ensure that all exposed pipework on the tank is insulated to minimalise any heat
losses.

Ensure the Thermostatic Mixing Valve is adjusted to control the hot water outlet
temperature between 50 - 55°C (take shower differential into consideration).

Check the boiler pump setting is set as high as possible without emitting excessive
noise to prevent a boiler temperature differential of greater than 11°C.

If required, chlorinate the hot and cold water system in accordance with BS 6700
and Water Regulations. Please note that the whole of the domestic hot and cold
water systems must be adequately flushed after chlorination. Failure to do so will
cause damage to the exchangers/immersion heaters etc.
DON’T

Use a combined feed and vent.

Use tube smaller than 28mm between boiler and tank if the boiler exceeds an
output of 60,000 Btu (17kW).

Place any clothing or other combustible materials against or on the tank.