Product Instruction Manual
SF4
Pressure reducing kit
Version 3.2 Jan 2015
V15.6/2
Thank you for purchasing the SF4 pressure reducing kit. Please read and
understand these instructions before commencing installation, and leave
them with the user when installation is complete.
1. Contents
This kit contains:
•
1 expansion vessel
•
1 check (one way) valve
•
1 pressure reducing valve
2. Compatibility
To be used in conjunction with Hyco 5L, 10L and 15L unvented (mains pressure)
water heaters.
3. When this kit is required
This kit is required if there is a risk that mains incoming water pressure may exceed 4.2
bar. Please note water pressure fluctuates from place to place and from time to time.
It is usually highest at night when demand is lowest.
If the incoming water pressure is too high and this pressure reducing kit is not fitted,
the pressure relief valve (supplied with the heater) might open and discharge water
constantly. This is a clear indication that a pressure reducing kit is required.
The pressure reducing valve must be fitted so that water flows in the direction of the
arrow. The valve works by reducing the pressure at the outlet side to a maximum of
3 bar, regardless of the pressure on the inlet side.
The expansion vessel must be fitted downstream of the pressure reducing valve and
is necessary to accommodate the expansion of water as it is heated, as the pressure
reducing valve prevents the usual expansion through the pipework.
The check valve should be fitted in the position indicated to ensure expanded warm
water does not enter the general water supply.
2
4. Installation
Hot
Cold
Pressure
relief
valve
Expansion
vessel
Check
valve
Nearest cold
draw o
Pressure
reducing
valve
Service
valve
Cold water
mains
T piece
To drain
Length of pipework
required for expansion
5 litres 1.4m
10 litres 2.8m
15litres 4.2m
Speedow
•
Install as shown below:
ALWAYS FIT THE PRESSURE RELIEF VALVE SUPPLIED WITH THE HEATER
(NOT THIS KIT)
5. Specifications
Expansion vessel Pressure reducing valve
Height 225mm Height 73mm
Width 120mm Width 64mm
Depth 120mm Depth 46mm
Weight 1.0kg Weight 0.3kg
Pre-set pressure 3.5 bar Pre-set pressure 3.0 bar
Check valve
Height 65mm
Width 25mm
Depth 25mm
Weight 0.1kg
3
6. Guarantee and service policy
This product is guaranteed against faulty materials and manufacture for a period of one
year from the date of purchase. Hyco will in its sole discretion replace, repair or refund
any faulty unit. Incorrect installation and failure to follow correct operating instructions
are excluded. Consequential costs such as labour charges or damage to surroundings
are expressly excluded.
Hyco Manufacturing Ltd
Normandy Court
Express Way
Castleford, WF10 5NR
T 01924 225 200
F 01924 225 210
E sales@hyco.co.uk
*2647*
hyco.co.uk
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