Hyco Speedflow SF10L Fitting & User Instructions page 3

Hyco Manufacturing Ltd Water Heating Accessory kit SF1
A.Contents
This kit contains:
•
1 expansion vessel
•
1 check (one-way) valve
B. Compatibility
To be used in conjunction with Hyco Speedflow 10L and 15L unvented (mains pressure) water heaters.
C. When this kit is required
This kit is required if either of the following conditions applies:
1. Presence of device preventing reverse flow
If a one-way device is fitted that prevents hot water expansion, the pressure relief valve would
operate routinely on the heating cycle. This is not permissible under Water Regulations. Note
that pressure reducing valves, water meters and similar devices are usually one-way and
would block expansion.
2. Cold water off-take too close to the heater
It is a requirement to ensure that stored heated water does not mix with drinking water
supplies. If there is a cold water off-take very close to the heater there is a risk that the hot and
cold water supplies would mix. The minimum distance required between the heater and the
nearest cold water off-take is 2.8m for the Speedflow 10L and 4.2m for the Speedflow 15L
model.
D. Installation
Install as shown below:
expansion relief valve
hot
cold
IMPORTANT:ALWAYS FIT EXPANSION RELIEF VALVE SUPPLIED WITH THE
HEATER (NOT THIS KIT)
E. Helpline call 01977 517555 9-5 Mon-Fri for technical assistance
F. Other Hyco accessories. Kit SF2 (pressure reducing valve) is required for mains pressure greater
than 4.2 bar. If the relief valves opens continuously check the incoming mains pressure.
F:my documents\SF1INSTALL.DOC
expansion vessel
nearest cold water
draw off
check valve
to drain
service valve
cold water supply