Keston Thermomatic RSM20/FB, Installation & Servicing Instructions Manual, Page: 29 / 46

Page 29
Fig. 7.8. CONDITION 8.
Is the dom. w ater coming out
of the taps hot enough?
Is the rate of hot w ater flow too
high?
To obtain the desired w ater
temperature adjust the w ater flow
acting on the cold w ater inlet cock
(see no 41 exploded draw ing)
Is the domestic coil partly
scaled?
Wrong setting of the boiler htg.
regulatory thermostat (HT)?
Is there a temperature loss in the
pipeline connecting to the taps?
Does the boiler temperature
stop under 70ºC (w ithout
draw ing dom. w ater)?
Id the boiler htg. regulatory
thermostat (HT) set on max?
Set HT to position min.
Insufficient gas delivery?
No
Replace HT
Set the HT temperature at
maximum.
Insulate the pipeline.
Set the proper pressure to the gas
valve (see gas valve drw g.) If faulty
replace the gas valve.
Clean it.
When small flow s of dom.
w ater are draw n (3.5
lt/min) is w ater too hot?
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
No
No
No
No
No
Fig. 7.9. CONDITION 9.
Restore the w ater supply.
Is the dom. w ater regulatory
ball valve too closed or dirty?
Is the dom. w ater flow insufficient?
Inadequate pressure in the
w ater supply?
Are the pipeline or the flow
obstructed?
Is the domestic coil obstructed?
Open more or clean it.
Clean them.
Make an antiscaling w ashing.
Yes Yes
Yes
Yes
Yes
No
No
No