Heatrae Sadia HOTFLO Guía

HOTFLO

Installation and User Instructions

for the

HOTFLO

10 and 15 litre Unvented Water Heaters

HEATRAE SADIA

The quality name in water heating

Please read and understand these instructions before starting

work.

Please leave this leaflet with the user following installation

36 00 5719 Issue 3

Please read and understand these instructions prior to installing your Hotflo unvented

water heater. Particular attention should be paid to the section headed IMPORTANT

INSTALLATION POINTS. Following installation and commissioning the operation

of the heater should be explained to the customer and these instructions left with

them for future reference.

TECHNICAL SPECIFICATIONS

Electrical rating................................................... 2.0/2.2kW 230/240V

Capacities ............................................................ 10 or 15 litres

Weight (full) ........................................................ 10 litre - 16.5kg

............................................................................. 15 litre - 23.4kg

Rated pressure ..................................................... 6 bar

Minimum recommended supply pressure ........... 0.8 bar

Temperature/Pressure Relief Valve ..................... 90oC/7 bar

1.0IMPORTANTINSTALLATIONPOINTS

1.1 The Hotflo unvented water heater MUST be fitted with a Pressure (expansion)

Relief Valve. This MUST be fitted to the cold water supply near the heater. FAIL-

URETOPROVIDEADEQUATEPRESSURERELIEFWILLINVALIDATEANY

GUARANTEEANDLEADTOADANGEROUSINSTALLATION

1.2 Expansioncantake place withinthe cold watersupply PROVIDEDTHATBOTH:

(a) Backflow in the main is not prevented by any stopvalve with loose jumper,

check valve, pressure reducing valve or similar, AND

(b) Hot water expansion does not enter a branch to a cold water outlet (see Diagram

1 for expansion pipe lengths).

N.B.Boththeaboveconditionsmustbemet.Additionallyexpansionwithinthecold

watersupplywillnot bepossibleifthe staticsupplypressureexceeds4.1 bar

(60p.s.i.).

1.3 If any of the conditions in 1.2 above cannot be met expansion must be

accomodated using an Expansion Vessel. To ensure all expansion takes place in the

vessel a Check Valve must also be fitted (see Diagram 2). UseAccessory Pack U5

codeno. 95 970 356.

1.4 If the static supply pressure exceeds 4.1 bar (60p.s.i.) a Pressure Reducing Valve

must be fitted to the cold main supply. If a Pressure Reducing Valve is used an

Expansion Vessel must also be used (see Diagram 3). Use Accesory Packs U1 and

U5codeno.’s 95 970 352and95 970 356.

1.5 Where specifications demand the fitting of a Temperature/Pressure Relief Valve one

can be fitted on site (see Diagram 4). UseAccessory Pack U6 code no. 95 970 359.

NOTE the fitting of Pack U6 does not alter the requirements detailed in points 1.1

to 1.4 above.

HOTFLO

WARNING: IF WATER FLOWS FROM THE PRESSURE RELIEF

VALVE OR TEMPERATURE/PRESSURE RELIEF VALVE THE

ELECTRICITY SUPPLY MUST BE SWITCHED OFF IMMEDI-

ATELY. CONTACT THE HEATRAE SADIA SERVICE TEAM

(Tel: 01603 420330) OR AN APPROVED INSTALLER.

Diagram 1 For inlet pressures up to 4.1 bar (60 p.s.i.)

Diagram 2 For inlet pressures up to 4.1 bar (60 p.s.i.) where expansion

in main supply is not possible

Diagram 3 For inlet water pressures above 4.1 bar (60 p.s.i.)

2.0 INSTALLATION - GENERAL REQUIREMENTS:

2.1 National Wiring rules may contain restrictions concerning the installation of

these units in bathrooms.

2.2 The unit should be vertically wall mounted using the fixing points provided.

Alternatively it can be floor mounted on its base. The water connections must

always be to the top of the unit.

2.3 Enough space should be left at the top above the unit for pipe connections and

access to the Temperature/Pressure Relief Valve (if fitted). Refer to Diagram 5

and the Dimensions Table to determine a suitable position for the heater.

2.4 NOTE: Ensure that the wall can support the full weight of the unit (see TECHNI-

CAL SPECIFICATIONS) and that there are no hidden services (electricity, gas,

or water) below the surface of the wall.

2.5 The unit should be fixed to the wall using No. 12 screws into suitable wall plugs.

2.6 DO NOT install where the unit may freeze.

2.7 Refer to the section IMPORTANT INSTALLATION POINTS to determine which

valves and accessories are required. Plumb in the valves in the sequence shown in

the relevant Diagrams 1 to 4.

2.8 The water connections are 15mm diameter copper tubes suitable for compression

fittings. Do not use solder joints as this will damage the heater.

2.9 The INLET is marked BLUE, the OUTLET is marked RED. It is recommended

that a WBS Listed isolating valve be fitted on the cold water supply to the heater.

Several hot outlets can be served.

2.10 Plumbers Paste must not be used as it can impair the operation of the valves.

Diagram 4 Temperature/Pressure Relief Valve

NOTE: The fitting of Pack U6 does not alter the requirements detailed in

Points 1.1 to 1.4 (Diagrams 1 to 3)

HOTFLO

3.0 INSTALLATION -

ELECTRICAL REQUIREMENTS

WARNING: This appliance must be earthed. It is suitable for a.c.

supply only. Disconnect the electrical supply before removing the

terminal cover. Installation must be in accordance with the current

I.E.E. Wiring Regulations.

3.1 The unit is supplied fitted with a 0.75m 3 core 1.5mm2flexible

cable. The electicity supply should be fused 13 Amp and be via a

double pole isolating switch with a contact separation of at least

3mm in both poles. Refer to the schematic wiring diagram below.

3.2 The wires are colour coded as follows:

Green and Yellow EARTH ( )

Brown LIVE (L)

Blue NEUTRAL (N)

Wiring Diagram

NEON

ELEMENT

('Stat/Cut-out plu

directly onto element

terminations)

COMBINED

THERMOSTAT

AND THERMAL

CUT-OUT

RESET

BUTTON

EARTH

POST

15 Litre10 LitreDim ension 613457A656500B516360C

NOTE: If fitting Pack U6 the valve will add

110mm to the overall height (Dimension B)

Diagram 5

4.0 INSTALLATION -

DISCHARGE PIPE REQUIREMENTS

4.1 The discharge outlet from the Pressure (expansion) Relief Valve and, where

fitted, the Temperature/Pressure Relief Valve must be connected to a discharge

pipe. It is recommended that a tundish be installed in the discharge pipe to give a

visible indication that the valves are operating.

4.2 The discharge pipe must fall continuously from the valve outlets and be unob-

structed.

4.3 The pipe from the valves to the tundish should be 15mm o/dia minimum. From

the tundish to the point of discharge the pipe should be 22mm o/dia minimum

and have a resistance to flow equivalent to 9 metres of straight pipe. Long

discharge pipe runs should have an increased internal diameter.

4.4 The pipe material should be capable of conveying water/steam at 100oC.

4.5 The final discharge point should be in a safe, visible position.

5.0 COMMISSIONING

5.1 Do not switch on the electrical supply until the unit has been filled with

water and checked for leaks.

5.2 Check that all installation, electrical and discharge pipe requirements have been

met.

5.3 Check that all water and electrical connections are tight.

5.4 Open a hot water tap, turn on mains water supply to the heater.

5.5 Allow unit to fill and leave hot tap running for a short while to purge any air and

flush out the pipework. Close the hot tap and check the system for leaks.

5.6 Manually test the operation of the Pressure (expansion) Relief Valve and, if fitted,

the Temperature/Pressure Relief Valve. Ensure water flows freely from the

valve(s) and through the discharge pipes.

5.7 Switch on the electrical supply. The indicator light will illuminate during

heating. When the set temperature is reached the indicator light will go out.

5.8 The set temperature can be adjusted by rotating the knob located in the terminal

cover.

HOTFLO

6.0 MAINTENANCE

Little maintenance is required, however if an element failure occurs the

inner container of the unit must be replaced. To do this:

6.1 Switch off and disconnect the electrical supply. Turn off the water

supply to the unit.

6.2 Open a hot tap to relieve any system pressure. Disconnect the

plumbing connections to the unit and remove from the wall hanging

screws (note full weights of units). Empty unit through the outlet

connection.

6.3 Remove the terminal cover by using a large flat bladed screwdriver

to depress the 3 snap lugs located in the top 3 rectangular depres-

sions.

6.4 Remove the plastic disc from the thermostat spindle. Remove the

insulating pad from the terminal housing. Disconnect the electrical

terminations to the thermostat. Disconnect earth links to the

earthing stud.

6.5 Remove the thermostat by pulling it vertically upwards.

6.6 Remove the top cover by gently prising the four lugs (indicated by

the raised features on the edge of the cover, one on each side and

two at the back, see Diagram 6 below) away from the body using a

large flat bladed screwdriver. Remove earth link from the earthing

tab and gently bend the earthing tab to a vertical position.

Diagram 6

7.0 MAINTENANCE - SAFETY VALVES

The Pressure (expansion) Relief Valve and, if fitted, the Temperature/Pressure Relief

Valve should be regularly checked. Manually operate the valves by either twisting the

cap or lifting the lever. Ensure water flows freely from the valve(s) and through the

discharge pipes. Ensure the valve(s) reseat correctly when released.

8.0 MAINTENANCE -

EXPANSION VESSEL PRECHARGE PRESSURE

The Expansion Vessel, if fitted, should have a precharge pressure of 4.1 bar (60

p.s.i.). This can reduce over time and eventually require re-charging. To do this:

8.1 Turn off water supply to the unit; open a hot tap to relieve system pressure.

8.2 Remove dust cap from top of Expansion Vessel

8.3 Check pre-charge pressure using a tyre pressure gauge. If the pressure is lower

than 4.1 bar (60 p.s.i.) it should be recharged using a tyre pump (Schraeder Valve

type). DO NOT OVER CHARGE.

8.4 Re-check pressure and when correct replace dust cap.

8.5 Turn on mains water supply and close hot tap.

6.7 Lift the inner container out with the top insulation section. Put the insulation to

one side. Please Note: the inner container is manufactured from recyclable

materials, dispose of the old container at a Local Authority Recycling Centre.

Insert the new inner container assembly ensuring it is in the correct orientation

(refer to Diagram 6). Replace the top insulation section, earth link and top cover.

6.8 Replace the thermostat ensuring it is pushed fully home onto the terminals of the

element and sits on the flared end of the thermostat pocket (see Diagram 7). Refit

the insulating pad and plastic disc to ensure the correct operation of the thermo-

stat. Re-wire referring to the Wiring Diagram.

6.9 Replace the terminal cover and re-commission the unit following the INSTAL-

LATION and COMMISSIONING instructions.

THERMOSTAT

POCKET

COMBINED

THERMOSTAT

& THERMAL

CUT-OUT

ELEMENT

TERMINALS

FLARED END OF

THERMOSTAT

POCKET

CORRECT

THERMOSTAT

LOCATION

INCORRECT

THERMOSTAT

LOCATIO

Diagram 7 Correct location of combined thermostat and cut-out

HOTFLO

9.0SPAREPARTS

The following comprehensive list of spare parts is available for your

Hotflo water heater. Please refer to the Rating Label on the side of your

heater before ordering to ensure the correct spare part is obtained.

DONOTREPLACEWITHPARTSNOTRECOMMENDEDBY

HEATRAESADIA-THISWILLINVALIDATEYOURGUARANTEEAND

MAYRENDERTHEINSTALLATIONDANGEROUS.

DESCRIPTION CODENO.

Inner container 10 litre ......................................... 95608 916

Inner container 15 litre ......................................... 95608917

Combined thermostat/thermal cut-out ................. 95612633

Indicator light....................................................... 95607992

Pressure (expansion) Relief Valve ........................ 95607986

Temperature/Pressure ReliefValve ....................... 95970359

CheckValve.......................................................... 95607987

ExpansionVessel ................................................. 95607988

Pressure Reducing Valve ..................................... 95607989

Top cover moulding ............................................. 95614186

Terminal cover c/w thermostat knob .................... 95614182

ACTIONPOSSIBLE CAUSESFAULT

1. Check electrical supply1. Electrical supply faultWater not heating

WiringDiagram)

replace thermostat/thermalcut-out (see

check thermostat operation. If necessary

2. Check cut-out, ifoperated reset and2. Thermalcut-out tripped

necessary

3. Check thermostat operation, replace if3. Thermostat fault

POINTS)

U2 (see IMPORTANT INSTALLATION

Fit Pressure Reducing Valve Pack U1 and

pressure

Excessivemains water

(continuously)

Pressure Relief Valve

Discharge of waterfrom

INSTALLATION POINTS)

1. Fit Pack U2 (see IMPORTANT

possible

1.Expansion in mains not

(intermittently)

Presure Relief Valve

Discharge of waterfrom

2. Fit Packs U1 and U2

4.1 bar (60 p.s.i.)

2. Mains pressure exceeds

3. Fit PackU2 when using PackU1

Pack U2

3. Pack U1 fitted without

4. Replace Pressure ReliefValve4. Pressure Relief Valve Fault

(see Section 8.0)

Expansion Vesselpre-charge pressure

5. Check and, if necessary, re-charge

Expansion Vessel

5.Loss ofpressure from

Replace thermostat and thermalcut-out

cut-out fault

Thermostat and thermal

Pressure Relief Valve

water/steamfrom

Relief Valve and or

Temperature/Pressure

Discharge of waterfrom

in accordance with flow direction arrows

1. Check all valves are correctly installed

fitted

1. Inlet valves incorrectlyNo water flow

2. Check mains water supply is on

turned on

2.Mains watersupply not

fitted check the strainer is not blocked

3. Check for obstructions. If Pack U1 is

supply

3. Blockage in mains water

while.

milkiness will disappear after a short

oxygen bubbles when flowing. The

Waterfroma pressurised systemrelease

Oxygenated water"Milky" water

10.0 FAULT FINDING

Disconnect the electrical supply before removing the terminal cover. It is recom-

mended that any service operations on the Hotflo heater are carried out by a compe-

tent person.

NOTE: Use only Heatrae Sadia approved spare parts. Replacement of any parts with

components not recommended by Heatrae Sadia will invalidate the guarantee and

may render the installation dangerous.

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