Draining The Boiler; Hydraulic Unit (Dhw); Cleaning The Cold Water Filter; Final Com M Issioning After Annual Service - ECR International COMBI 115 Installation, Operation And Maintenance Manual

1 1 .6 H ydra ulic Unit ( DH W )
For special areas, where wat er is harder t han 200 ppm or 12
grains/ gallon, inst all polyphosphat e dispenser or equivalent
t reat m ent syst em , com pliant wit h current regulat ions.
1 1 .7 Clea ning The Cold W a t er Filt er
Boiler is fitted with cold water strainer located on DHW
hydraulic assem bly ( B) . To clean:
• Drain dom est ic hot wat er syst em . ( C - 115 & 150)
• 165 Drain is field supplied/installed.
• Rem ove nut on DHW priorit y sensor unit using 18 m m
wrench. ( B)
• Pull out flow sensor and its filter.
• Rem ove any im purit ies.
NOTICE
When replacing and/ or cleaning " O- rings" on hydraulic
assem bly ( DHW) , use only Molykot e 111 as a lubricant ,
not oil or grease.
1 1 .8 Fina l Com m issioning Aft er Annua l Service
• Allow heat ing syst em t o heat . Balance t he syst em t o
achieve temperature difference across heating supply and
ret urn pipes at t he boiler.
• Check syst em for proper volum e and pressure. See page 4
for accept able volum e and pressure.
• Turn off boiler.
• Thoroughly flush water pipe work. Clean filters in heating
ret urn and supply wat er isolat ing valves.
• Repressurize t he syst em .
1 1 .9 Fina l Assem bly
• Place front j acket in posit ion on boiler. Secure in posit ion
at bot t om using screws previously rem oved.
• I f boiler is t o be left in service, set cont rols and room
t herm ost at .
• If boiler is not to be left in service, turn off gas and
elect rical supply.
• I f t here is possibilit y of boiler being left during freezing
condit ions, drain boiler and syst em . See sect ion 11: 4
Draining t he boiler. Manufact urer recom m ends at t aching
a label t o t he boiler drawing at t ent ion t o t he fact t hat t he
syst em has been drained.
1 1 - GEN ERAL M AI N TEN AN CE AN D CLEAN I N G
Com bi - 1 5 0 SH OW N
Com bi - 2 0 5 SH OW N
F
E
LEGEN D
Hydraulic Assem bly ( B)
DHW exchanger fixing screw
A
DHW priority sensor with filter
B
Boiler/ system drain tap (150 unit only)
C
(C-1 & C-2: access to tap C - bottom of boiler)
E DHW tem perature NTC probe
Low water cutoff
F
6 5
A
B
240013687 REV A [ 09/ 01/ 2022]