Hyco SF10K User manual

Speedflow
Undersink Unvented
Water Heater
Models SF10K and SF15K
Instruction Manual
Version 2.0 May 2009

HYCO SPEEDFLOW UNVENTEDWATER HEATER
MODELS SF10K (10 Litres) AND SF15K (15 Litres)
1. INTRODUCTION

operates at mains water pressure and can supply hot water to two or more basins
using ordinary taps.
CAUTION
THE SPEEDFLOW MUST BE INSTALLED AND MAINTAINED BY
A COMPETENT PERSON IN ACCORDANCE WITH CURRENT
ELECTRICAL AND PLUMBING REGULATIONS.
IT IS ESSENTIAL THAT THE ENCLOSED PRESSURE RELIEF VALVE
IS FITTED
MAKE PLUMBING CONNECTIONS WITH FLEXIBLE STAINLESS
STEEL HOSES TO FACILITATE FUTURE MAINTENANCE
ALWAYS FIT THE HEATER THE CORRECT WAY UP
(PIPES SHOULD BE AT THE TOP)
USE LOWEST ACCEPTABLE TEMPERATURE SETTING TO SAVE
ENERGY AND REDUCE LIMESCALE
DO NOT CONNECT TO POWER UNLESS UNIT IS FULL OF
WATER – OPEN TAP AND ALLOW WATER TO FLOW FREELY
TO CLEAR AIRLOCKS
DO NOT SWITCH POWER ON IF WATER IN HEATER OR PIPES
COULD BE FROZEN
2. INSTALLATION (WALL MOUNTING)

it can be mounted above or to the side of the outlet provided it is vertical with


ENSURE THE MOUNTING SURFACE IS STRONG ENOUGH TO
SUPPORT THE SPEEDFLOW INCLUDING THE WEIGHT OF
THE WATER.

(SF15K) can typically serve 2 or 3 depending on simultaneous usage.
1

2
3. PLUMBING CONNECTIONS

THE SUPPLIED 6 BAR PRESSURE RELIEF VALVE MUST ALWAYS BE
FITTED.THERE MUST BE NO OBSTRUCTIONS IN THE
PIPEWORK BETWEEN THE HEATER AND THE RELIEF VALVE.
THE RELIEF VALVE MUST DISCHARGE TO A SAFE AND VISIBLE
PLACE.


interchangeable.


OPEN HOT WATER TAP AND ALLOW WATER TO RUN
THROUGH FOR AT LEAST 5 SECONDS TO CLEAR AIRLOCKS.




there is no obvious problem at installation.
DIAGRAM A - Pressure below 4.2 bar
No accessories needed

3
4. ELECTRICAL INSTALLATION
Installation must comply with the latest IEE regulations.
Connection should be to a fused switched 13A spur. If the cable length is

to the original.
This product must be earthed.
IMPORTANT: DO NOT SWITCH THE HEATER ON UNLESS YOU ARE
CERTAIN THAT IT IS COMPLETELY FULL OF WATER. FAILURE TO DO SO
WILL VOID THE WARRANTY.
DIAGRAM B - Cold draw off nearby
DIAGRAM C - Pressure above 4.2 bar

warm water entering cold water supply.

Accessory SF4 needed to prevent pressure
relief valve discharging constantly



4
5. OPERATION

is heating.
USE THE LOWEST ACCEPTABLE TEMPERATURE SETTING TO
SAVE ENERGY.
 
TO CHILDREN OR THE INFIRM.A THERMOSTATIC BLENDING
VALVE IS RECOMMENDED IN HIGH RISK SITUATIONS.
6. 
AND ANODE REPLACEMENT
DISCONNECT ELECTRICITY SUPPLY BEFORE MAINTENANCE.
A re-settable safety thermal cut-out switches off the element in the event of the
unit over-heating.
The thermal cut-out may trip occasionally in normal use. If this happens the heater
will not heat water and the element light will not come on.
The thermal cut-out is located underneath the unit behind the grey access plate.

unit for ease of access to the cutout.

Drain water from heater and locate grey access plate.
Remove the cover retaining screws and gently prise cover off.

Element ange - remove to access anode.
Thermal cutout -
Press to reset.
Element securing bolt (x4)
Allen key required to remove.

5
6. 
AND ANODE REPLACEMENT (continued)

has tripped reduce the thermostat setting if possible.

Technical Department on 01977 517555.


7. MAINTENANCE

tank corrosion resistance.The anode condition should be inspected annually and

The pressure relief valve should be checked annually by twisting the cap and
verifying water is discharged.

6
8. TROUBLE SHOOTING
If problems persist contact Hyco Technical Dept on 01977 517555.
9. SPECIFICATIONS
SYMPTOM POSSIBLE CAUSE SOLUTION

from pressure relief valve
Water pressure is too
high (above 4 bar).
Fit Pressure Reducing
Valve Kit (Hyco Kit SF4).

pressure relief valve
during heating cycle only
Heated water cannot

due to obstruction.

(Hyco kit SF3).
Water is not heated 1.Thermal cut-out has
tripped.
1.See section 6. Check
heater is correct way
up (pipes at top).
2.Element has failed. 2.Replace element. See
section 6 for access to
element.
3.Thermostat has failed. 3.Replace thermostat.
Small volume of hot
water
1.Unit upside down. 1.Re-install correct way
up.
2.Thermostat set too
low.
2.Increase thermostat
setting.
3.Thermostat fault. 3.Replace thermostat.
Water appears to leak
from heater
1.Poor connections to
pipework.
1.Check plumbing

those to inlet and
outlet.
2.Element gasket leak. 

not over tighten. See
section 6 for access to
element.
Supply 230V ~ 50Hz
Power 2kW
Tank Capacity SF10K – 10 Litres
SF15K – 15 Litres
Tank Material Vitreous enamel lined steel
Dimensions



Pressure relief valve setting 6 bar
Thermal cutout Manual reset

Hyco Manufacturing Ltd
California Drive
Whitwood
Castleford
West Yorkshire
WF10 5QH

Web: www.hyco.co.uk
E-mail: [e-mail]
7
10. GUARANTEE AND SERVICE POLICY
This product is guaranteed against fault materials and manufacture for a period of



