Keston Spa Installation Manual download pdf (Page 11)

-

The return pipe

shourd

be

fitted

to

the

secondary

return/drain

off

tapping

near

the

base

of

the

cylinder.

-

A drain

off

cock

(not

suppried)

shourd

be fitted

iniine

in

the

secondary

return

near

the

connection

to the

cylinder

to,faciritate

dninage.of

the

cyrinder

for

main,"nun..

priiir"r.

-

A

non-return

valve

(not

supplied)

must

be fittea

to

prevent

backflow.

-

calculate

the flow

rate

and

pump

size

by determining

the

totar

heat

ross

in

flow

and return

in wafts.

-

consid,eration

should

be

given

to

the fitting

of

an

additional

vessel

where

excessively

large

secondary

loop

circuits

are

used.

Required

flow

rate

3.Water

is cold

-

Crossflow

from

cold

supply

-

Boiler

not

switched

on

(indirect)

-

Air locked primary

flow

-

Thermostat

settings

incorect

-

Cut

out

switch

need

reset

=

Totalwatts

litres/second

4186x

t000xT

whereT

=

temperature

difference

between

flow

and

return

(normally

the

desirable

drop

is

5C

and

the

hot water

temperature

should

be

60C).

'10.

Scale

Advice

and

Maintenance

-

ln

areas

of

hard

water

high

storage

temperatures

(above

50C) will

result

in scale

deposition

-

lt

is

advisable

to

set-the

thermostat

to

the required

level

and

fit a water

softener

or

scale

inhibitor

(capabre

of the

required

circuit

flowrate)

in

the cord

suppry

rine.

Maintenance

-

The

valve

easing

gear

on the

pressure

and

temperature

relief

valve

must

be

operated

at

least

once

every

6 months.

-

The

charge pressure

of

the

expansion

vessel

should

be

checked

annually

with

a

pressure

gauge

at

the

top

(and

whh

a hot

tap

open

and

the

cold

supply

turned

o?f).

Recharge

with

clean

dry

air

to 3.5

bar.

-

clean

the

pressure

reducing

valve

filter

every 2

years

or

of flow

from

water

heater

begins

to

deteriorate.

l l.Trouble

Shooting

&

Fault

Guide

i

WARNINGS

lf

hot

water

discharges

at tundish

do not

turn off

supply

main,

switch

off

power

to

electric

elements

and

shut

down

heating

boiler

(indirect

modeis)

The

cause

of

this could

be a failure

of

the

safety

controls

and

you

should

immediately

contact

your

installer

or our

service

operator.

SYMPTOM5

POSSIBLE

CAUSES

1. No

or low

flow

-

poor

mains pressure

-

Restricted

pipework

-

Mains

stopcock

-

Sticking

jumper

in

stop

-

Blocked

filter

2. Discharging

cold -

Loss of

expansion

vessel

-

Defective pressure

-

Blocked

or

defective

ACTION

-

Check

that

all arrows

on

valves

are in

water

flow

direction.

-

Use

larger

diameter

pipework

-

Operate

stopcock

or replace

-

Replace

stop

cock

-

Clean

filter

-

Check

and

recharge

vessel

reliefvahe

(with

hot

tap open)

-

Replace

pressure

valve

reducing

valve

-

Operate

expansion

valve

expansion

reliefvalw

mechanism

to

clear

or replace

-

Check

mixer

taps and

fit

check

through

mixer

top

or other

\lalve

on hot

outlet

from

heater

fittlngs.

-

CARRY

OUT

PROCEDURE

BELOW

Warnings

(Electric

Modelt

Always

isolate

the

electrical

supply

before

opening

heating

elements.

Confirm

that

power

supply

is reaching

the elemenls.

lfthermal

cut-out

switches

have

operated press

in

the

red button.

rf this

fairs

to

heat

the

cylinder

the

element

has

failed

and

should

be replaced.

Fit

new element

and

reset

thermal

cut-out.

wth

power

to

the

element

and the

cut-out

reset,

check

the vottage

on thermar

cut-out

outpui.

lf this

is incorrect

replace

cut-out

switch.

-

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