Expansion vessel kit
A. CONTENTS
This kit contains:
1 expansion vessel (0.5L for SF1, 2.0L for SF3)
1 check (one-way) valve
B. COMPATIBILITY
To be used in conjunction with Hyco 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 that expanded 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 10L and 4.2m for the
15L model.
D. INSTALLATION
Install as shown below:
IMPORTANT:ALWAYS FIT PRESSURE RELIEF VALVE SUPPLIED
WITH THE HEATER (NOT THIS KIT)
Hot
Cold
To Drain
Pressure
Relief Valve
Expansion
Vessel
Check Valve
Nearest Cold
Water Drain Off
Service Valve
Cold Water Supply
FYK0433 Expansion MAN:EYK0780 HANDYFLOW MAN 24/1/08 16:08 Page 3