Dom Estic Hot Water Mode; Frost Protection; Low Water Pressure Sensor (I Nternal) - ECR International COMBI 115 Installation, Operation And Maintenance Manual

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W ARN I N G
Burn, Scald Hazard! Wat er t em perat ure over 125° F
( 51° C) can cause severe burns and scalding. See
User's Manual before set t ing wat er t em perat ure.
Failure t o follow t hese inst ruct ions could result in deat h
or serious inj ury.
1 0 .4 Dom est ic H ot W a t er M ode
Com bi Boilers – M odels 1 1 5 , 1 5 0 & 2 0 5
• Dom est ic hot wat er call for heat is init iat ed when a faucet
is opened and water flow is sensed by boiler's DHW flow
swit ch.
• 3- way valve divert s boiler wat er t o dom est ic hot wat er
( DHW) heat exchanger ( Brazed- plat e) t o heat incom ing
dom est ic wat er.
• Com bust ion fan com e on at ignit ion speed, closing t he air
pressure switch (150 model only), allowing power to flow
t o t he spark generat or and gas valve, creat ing ignit ion in
t he com bust ion cham ber.
• Flame sensor senses flame in combustion chamber and
sends a signal t o t he cont rol board.
• Cont rol board m onit ors boiler wat er and
DHWt em perat ures, m odulat es fan speed and gas rat e
accordingly.
• Dom est ic call for heat ends when faucet is closed and
DHW flow switch does not see water flow.
H ea t Only Boilers – M odels 7 5 , 1 0 0 & 1 2 5 w it h I ndirect
Ta nk
• When t he boiler receives a call for hot wat er from t he
I ndirect t ank Aquast at or Tank Sensor, t he 3- Way valve
divert s wat er from t he heat ing syst em t o dedicat ed
I ndirect t ank supply t o heat dom est ic wat er in t he t ank.
• Com bust ion fan com es on at ignit ion speed, closing t he air
pressure switch (125 model only), allowing power to flow
t o spark generat or and gas valve, creat ing ignit ion in t he
com bust ion cham ber.
• Flame sensor will sense flame in combustion chamber and
send a signal t o t he cont rol board.
• Cont rol board m onit ors boiler wat er and DHW
t em perat ures and m odulat es fan speed and gas rat e
accordingly.
• Call for dom est ic wat er heat ing ends when t he aquast at or
tank sensor is satisfied.
H ea t Only Boiler 1 6 5
165 boiler does not have a 3-Way Valve. When paired wit h
an I ndirect t ank, t he t ank is a separat e heat zone. The
Indirect tank is controlled by a field supplied multi zone
relay, priorit y is det erm ined by t he relay set t ings.
1 0 - OPERATI N G I N STRU CTI ON S
1 0 .5 Frost Prot ect ion
Boiler m onit ors supply and ret urn wat er t em perat ures t o
enable frost prot ect ion which aut om at ically t urns boiler and
pum p on.
I f wat er in boiler falls below 41° F ( 5° C) , providing boiler is
connect ed t o power, boiler will operat e unt il wat er t em perat ure
in t he syst em reaches approxim at ely 86° F ( 30° C) .
Frost prot ect ion is for boiler only and not for com plet e Cent ral
Heat ing Syst em .
1 0 .6 Pum p a nd M odels Equipped w it h Three w a y
Va lve
I f elect ricit y is connect ed t o t he boiler, regardless if boiler
power is "On" and has not operat ed for 24 hours for heat ing
or hot wat er, boiler pum p will operat e aut om at ically for one
m inut e every 24 hours.
1 0 .7 Low W a t er Pressure Sensor ( I nt erna l)
Device prot ect s prim ary exchanger from dam age. I t will not
allow boiler t o run in a LOW wat er pressure sit uat ion. Low wat er
condit ion occurs when wat er pressure drops below 7.0 psi .
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240013687 REV A [ 09/ 01/ 2022]